Browse Topic: Tires

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Evaluating Passenger Car Tyre Performance: Lateral and Longitudinal Dynamics in Varied Testing Conditions2026-26-0578To be published on 01/16/2026
The lateral and longitudinal dynamics of passenger car tyres are crucial for vehicle safety, handling and stability, thus having a direct influence on the braking, acceleration, and cornering performance of a vehicle. This study investigates the influence of key input parameters, namely inflation pressure, vertical load, and inclination angle, on the tyre behaviour using a dual approach: Indoor testing using a Flatbed machine for controlled conditions and Outdoor testing using a traction trailer for real-world evaluations. Lateral dynamics is evaluated across a range of slip angles to analyse lateral force and aligning moment characteristics. The quantification of the influence of inclination angle, inflation pressure, and load on lateral characteristics is done by evaluating the cornering stiffness and aligning stiffness. The indoor tests are conducted in both sweep and steady-state modes. The outdoor tests rely solely on sweep testing due to practical limitations. The longitudinal
Sethumadhavan, Arjun, Duryodhana, Dasari, Tomer, Avinash, Ghosh, Prasenjit, Mukhopadhyay, Rabindra
"Parametric Evaluation of Rolling Resistance in Bias & Radial Tyres and influence of key operational parameters under varying conditions."2026-26-0606To be published on 01/16/2026
Tyre rolling resistance is a fundamental parameter in automotive engineering, directly impacting vehicle fuel efficiency and overall performance. The Rolling Resistance Coefficient (CRR) is influenced by tyre construction, material properties, and operational conditions such as inflation pressure, vehicle speed, load, ambient temperature, and road surface roughness. This study investigates the influence of critical parameters—including test speed, inflation pressure, load, temperature, and slip angle—on the rolling resistance of tyres of various sizes. While previous research has predominantly focused on radial tyres, this paper extends the analysis to include bias-ply tyres, which remain widely used in ASEAN countries, including India. The findings aim to offer valuable insights for policymakers and researchers by examining the behaviour of bias tyres under real-world conditions. Special focus is given to the influence of slip and camber angles, with experiments conducted on passenger
Joshi, Amol, Khairatkar, Vyankatesh, Belavadi Venkataramaiah, Shamsundara
Optimizing Tire NVH Performance in Electric Vehicles: A Comprehensive Approach Using Benchmarking, Simulation, and Validation2026-26-0605To be published on 01/16/2026
The electrification of mobility is becoming increasingly vital in meeting global zero carbon footprint targets, with nations setting ambitious goals to achieve by 2030. As part of this transformation, the development of Electric SUVs (E-SUVs) capable of navigating diverse terrains and road conditions presents a significant challenge, often extending vehicle development timelines. To address these demands, many Original Equipment Manufacturers (OEMs) are adopting a ‘Born-Electric’ platform approach, specifically tailored to the unique requirements of electric vehicles. However, this approach introduces several challenges, particularly in maintaining the Noise, Vibration, and Harshness (NVH) levels expected by customers. The elimination of the Internal Combustion Engine (ICE) powertrain has significantly shifted the NVH dynamics of E-SUVs, with tire road rolling noise becoming a dominant factor influencing in-cabin noise perception, Tire-induced noise and vibrations emerge as primary
Singh, Ram Krishnan, Deivasigamani Purushothaman, Balakrishnan, Paua, Ketan, ahire, Manoj, Adiga, Ganesh N
Design Robustness of Electronic Locking Differential for enhanced off-road performance2026-26-0502To be published on 01/16/2026
The Electronic Locking Differential (ELD) is a critical component for enhancing off-road vehicle performance by ensuring optimal traction in challenging terrains. This paper addresses intermittent engagement issues observed in the ELD system during off-road trials, which impacted its reliability and functionality. It presents a comprehensive study of design robustness improvements implemented to resolve these concerns and optimize the ELD’s performance, ensuring enhanced customer satisfaction in demanding off-road environments. The analysis begins with identifying factors contributing to the intermittent engagement and disengagement of the ELD system upon actuation. These factors include residual magnetism, material properties, temperature effects, and the stack-up characteristics of transfer path components under various boundary conditions. To address these challenges, three key design modifications were introduced: (1) reduction of residual magnetism through an increased air gap
S, Mohd Imtiaz, AP, Baaheedharan, Ghumare, Dheeraj, Kanagaraj, Pothiraj, Jain, Saurabh Kumar
Investigation of Low Frequency Interior Noise due to Tyre-Road Interaction2026-26-0351To be published on 01/16/2026
Unlike internal combustion engine (IC Engine) vehicles, the rapidly growing electric vehicle (EV) market demands tyres with superior yet often conflicting performance characteristics. The increased weight of EVs, due to their heavy batteries, necessitates robust tyres with reinforcement and higher inflation pressure. Conversely, increased wear due to higher initial torque and the need for lower rolling resistance to extend range, combined with the requirement for better grip for improved handling, call for advanced compound and tread pattern designs. EV tyres need to be stiffer, lighter, and less dampened, making it very hard to reduce low-frequency (20-200 Hz) interior noise that was previously hidden by engine noise. This study investigates the low-frequency (20-200 Hz) structural-borne interior noise performance of EV tyres using both experimental and simulation tools. By wisely tuning the tyre's stiffness, mass, and damping properties, the necessary noise targets can be met. These
Subbian, Jaiganesh, M, Saravanan
Novel Approach for Predicting Steering Rack Load Using Multibody Simulation2026-26-0378To be published on 01/16/2026
In the initial stages of a vehicle development program, the sizing of various components is a critical deliverable. The steering system, in particular, requires a precise estimation of the rack load for the appropriate sizing of the rack and assist units. Accurately predicting the load on the system during the early stages of development is challenging, especially in the absence of benchmark or legacy data. Commonly used processes for estimating parking steering effort often employ simplistic approaches that may fail to account for parameters such as tire size, vertical stiffness, and steering geometry, leading to reduced accuracy. This paper introduces an advanced methodology for predicting steering rack loads, which incorporates considerations such as contact patch size and pressure variation, as well as the tire jacking effect. The methodology involves mathematical modeling of the contact patch using mesh-grids, utilizing common inputs available in the early stages of vehicle
Shirke, Umesh, Dabholkar, Aniruddh, bardia, Vivek, Srivastava, Harshit, PRASAD, TEJ PRATAP
Sustainable Tyre- A Journey to Meet Future Requirements of Tyre Industry2026-26-0291To be published on 01/16/2026
Sustainability and environmentally friendly business practices are becoming essential. Tyre industries are embracing the green initiatives to reduce its impact on the environment by exploring the eco-friendly strategies. Starting from the ethical raw material sourcing to a creative recycling technique, strategies are widely distributing in every step of tyre manufacturing to disposition. Each stage of a tyre's life cycle viz. raw material procurement, manufacturing, transportation both upstream and downstream as well as during the end-of-life phases have an emission-saving potential. It is important to reduce emissions at every stage of tyre's lifecycle. We, JK Tyre has recently developed a Sustainable Tyre with 11% less GHG emission through sustainable raw material approach. Bio sourced or bio attributed raw materials like Styrene Butadiene Rubber (SBR), Polybutadiene Rubber (PBR), Rubber process oil (RPO) and Silica along with natural rubber (NR) had been used. Beside the raw
Bhandary, Tirthankar, Singha Roy, Sumit, Paliwal, Mukesh, Dasgupta, Saikat, Chattopadhyay, Dipankar, Das, Mahuya, Mukhopadhyay, Rabindra
Exploring the Influence of Wheel Rim Width on Tire Performance through rig testing and Vehicle-level Evaluation: A Comprehensive study2026-26-0603To be published on 01/16/2026
With increasing challenges for optimizing vehicle ride and handling performance along with efficiency, the synergy between major systems such as suspension, chassis, brakes & tires has been investigated in the past. In this regard, the interaction between wheel rim width and tire performance characteristics has become a topic of interest. Extensive research is being conducted in the automotive industry to understand their key interaction dynamics and make appropriate design selections. This study aims to provide a comprehensive analysis of how variations in wheel rim width affect key tire performance parameters such as lateral force characteristics ,damping property, tire footprint, and pinch cut resistance. Also, the subsequent influence on vehicle-level performance parameters such as braking, ride & handling, steering, and durability is captured. Through rig level testing and full-vehicle evaluation data, several key observations have emerged. Firstly, it was observed that narrower
Singh, Ram Krishnan, Paua, Ketan, Sundaramoorthy, Ragasruoban, LENKA., VISWESWARA, ahire, Manoj, Adiga, Ganesh N
Enhancing Range Prediction Accuracy for the BEV: Bridging the Gap Between Simulation and Real-World Testing2026-26-0521To be published on 01/16/2026
Accurate range estimation in battery electric vehicles (BEVs) is essential for optimizing performance, energy efficiency, and customer expectations. This study investigates the discrepancies between physical test data and simulation predictions for the Jeep Wagoneer model. A detailed range delta analysis identifies key contributors to the observed deviations, including regenerative braking inefficiencies, increased propulsion demand, auxiliary loads, and estimated drivetrain losses within the Electric Drive Module (EDM) during traction and regen. Results indicate that the test vehicle exhibits lower regenerative braking efficiency and higher traction and lower regen consumption than predicted by simulations, primarily due to EDM inefficiencies and friction brake usage during regeneration. The study underscores the importance of refining simulation methodologies by integrating real-world, test based EDM loss maps to improve accuracy and better align predictive models with actual vehicle
ali, Shoaib, Mahajan, Prasad
Comprehensive research study examining Tyre wear and its Indian perspective.2026-26-0604To be published on 01/16/2026
Automobile emissions refer to the gases and particles released into the atmosphere by vehicles during their operation. These emissions contribute to environmental pollution and have an impact on human health and the environment. This paper assimilates findings from a comprehensive research study examining tyre wear and its Indian perspective. Tyre wear understood as a factor affecting road safety, environmental health, and economic sustainability. The study identifies factors affecting tyre wear and provides overview regarding tyre wear generation in India, encompassing road infrastructure, vehicle characteristics, driving patterns, and environmental factors. Moreover, it examines the adverse effects of these particles on human health, such as respiratory ailments and cardiovascular diseases, as well as their impact on ecosystems. This paper delves measures to measure tyre wear and safeguard both environmental and public health. It also covers the tyre wear measurement methodologies to
Joshi, Amol, Khairatkar, Vyankatesh, Belavadi Venkataramaiah, Shamsundara
Steel-based Laminates for Lithium-ion Pouch Cell of Electric Vehicles2026-26-0186To be published on 01/16/2026
Aluminium foils have gained traction with EV battery manufacturers for their pouch cell format. Over the years it has evolved as a material of choice, but it is still plagued by issues of stress concentration, swelling due to lower strength and stiffness of base aluminium layer. Preliminary investigation revealed that laminates using steel foil material (thickness <0.1mm) could be a potential candidate for EV pouch cell casing. Thus, steel-based laminate was developed meeting key functional requirements (e.g. barrier performance, insulation resistance, peel strength, electrolyte resistance, formable without cracking at edges, and heat sealing compliant). This innovative patented steel-based laminate was further used to manufacture pouch cell prototypes (maximum capacity 2.5Ah) for key performance tests (e.g. cell cycling, nail penetration and thermal runaway). The study paves the way for a low cost, sustainable and flexible yet strong steel-based laminate packaging material solution
Singh, Pundan Kumar, Raj, Abhishek, Kumar, Ankit, Chatterjee, Sourabh, Verma, Rahul Kumar, Samantaray, Bikash, Gautam, Vikas, Pandey, Ashwani
Experimental Evaluation of Tyre Vertical Dynamic Stiffness and Damping for Ride Model Applications Using Flat Trac2026-26-0607To be published on 01/16/2026
The damping and vertical dynamic stiffness of a tyre are critical to ride comfort and overall dynamics, particularly for low-frequency excitations in urban and highway driving. Accurate ride models depend on precise tyre parameterization, as tyres are the primary interface between the vehicle and the road, absorbing surface irregularities before the suspension engages. This study investigates an experimental methodology characterizing the vertical dynamic behaviour of pneumatic tyres using a Flat Trac test machine. Contrary to the conventional approaches that depend on intricate shaker rigs or frequency dependence function models, the proposed technique uses a realistic force displacement loop-based technology which is appropriate for ride model applications. Dynamic stiffness is calculated as the peak force divided by peak displacement during vertical sinusoidal excitation. Damping is derived from hysteresis energy loss per cycle. The tests were conducted under various conditions by
Duryodhana, Dasari, Sethumadhavan, Arjun, Tomer, Avinash, Ghosh, Prasenjit, Mukhopadhyay, Rabindra
DC Link Capacitor Size Reduction Using Phase-Shifted PWM Techniques for Pole Phase Modulated Induction Machine Drive2026-26-0170To be published on 01/16/2026
Multiphase machines i.e. electrical machines with more than three phases have many advantages compared to the three-phase machines for high power density applications. The major advantages of multiphase machines include lower space harmonics thereby reduced losses and improved efficiency, reduced torque pulsations leading to lesser vibrations and acoustical noise, higher fault tolerance which retains the self-starting ability with minimum deration in the output power in case of fault in one or more phases and enhancement of torque density by adding higher order harmonic currents into the stator currents. Requirement of power electronic switches with reduced rating compared three phase motor drives for a given power rating is another important advantage which supports employing multiphase machines in high power applications. Wider speed and torque ranges are other important requirements of a drive for high power traction and propulsion application. Conventional machines need to be over
A, Rajeshwari
Driver-in-the-Loop Optimization of Tire-Vehicle Dynamics using Virtual Tire Development approach through CD Tire Models2026-26-0099To be published on 01/16/2026
This study provides a virtual development process using VI-Grade Driving Simulator and Adams simulation integrating CD tire models to modify all-terrain tire performance for an altered and new proposed version of an existing production vehicle. The proposed alteration introduces ride height changes, weight distribution changes, and centre of gravity changes from existing vehicle design. The proposed new vehicle variant also introduces tire change from highway terrain type to all-terrain type as it was intended to deliver some off-roading capabilities, thereby vehicle dynamics and kinematics recalibration & tuning required. The conventional development cycles through physical prototypes are time-consuming and expensive. Alternatively, this solution combines high-fidelity tire simulation, driver-in-the-loop (DIL) simulation, and multi-body dynamics analysis to reduce development time and prototype cycles. The proposed method begins with baseline correlation, augmenting Adams vehicle
Shrivastava, Apoorv, Asthana, Shivam
Determination of Acrylonitrile Content in Nitrile Butadiene Rubber Vulcanizates by Py-GCMS Techniques2026-26-0546To be published on 01/16/2026
Nitrile Butadiene Rubber (NBR), a copolymer of butadiene and acrylonitrile is known for its superior resistance to hydrocarbon oil, low gas permeability and excellent thermal stability. It is extensively used in seals, O-rings, conveyor belts and pneumatic tires. It is worth mentioning that these performance attributes are predominantly influenced by acrylonitrile content. While solid-state 13C Nuclear Magnetic Resonance (NMR) is an established technique for structural characterization of rubber vulcanizates, its high cost and accessibility limits its application in routine industrial analysis. This study aims to develop Pyrolysis-Gas Chromatography/Mass Spectrometry (Py-GCMS) as a robust, precise, cost-effective alternative to determine acrylonitrile content in NBR vulcanizates. This research demonstrates and establish a method to determine the acrylonitrile (ACN) content in finished rubber vulcanizates through pyrolysis gas chromatography-mass spectrometry (Py-GCMS). This method
Samanta, Rajyasree, Ghosh, Debojit, Anjana, Kanhaiya, Sen, Amit, Guria, Biswanath, Chanda, Jagannath, Samui, Barun, Ghosh PhD, Prasenjit, Mukhopadhyay, Rabindra
Predictive Simulation Framework for Tyre Curb Impact Durability Assessment and Design Optimization2026-26-0396To be published on 01/16/2026
Tyre structural durability validation is a critical aspect of automotive design, considering the worsening road conditions. One of the key validation tests for assessing structural integrity is the curb impact test, which evaluates the tyre's ability to withstand sudden and concentrated impacts. Typically, this process involves physical testing of preliminary tyre samples, followed by iterative modifications to the tyre's construction to meet durability requirements. However, this approach often compromises ride performance, necessitating a more efficient and predictive methodology. To address this challenge, a frugal simulation-based prediction methodology has been developed to evaluate tyre curb impact durability before vehicle-level testing. This allows for the optimization of tyre design parameters early in the development process, ensuring structural performance while minimizing ride and handling (R&H) tuning iterations. By reducing the number of iterations, the methodology
Sundaramoorthy, Ragasruoban, LENKA., VISWESWARA
Drive Cycle Based Energy Audit & Range Estimation for 4X2 Electric Truck2026-26-0163To be published on 01/16/2026
Transportation sector in India accounts for 18% of total energy consumption. Demand of energy consumption is being met by the imported crude oil, which makes transportation sector more vulnerable to fluctuating international crude oil prices. India is mindful of its commitment in 2016 Paris climate agreement to reduce GHG emissions by 35% by 2030 as compared to 2005 levels. To fast track the decarbonization of transportation sector, commercial vehicle manufacturers have been exploring other viable options such as battery electric vehicles (BEVs) as a part of their fleet. As on today, BEV has its own challenges such as range anxiety & high total cost of ownership. Range anxiety can be certainly addressed by optimum sizing of electric powertrain, reduction in specific energy consumption (SEC) & use of effective regeneration strategies. Higher SEC can be more effectively addressed by doing vehicle energy audit thereby estimating the energy losses occurring at each powertrain component of
Gijare, Sumant, Karthick, K., Juttu, Simhachalam, Thipse, Sukrut S., A, Jothikumar, J, Frederick Royston, SR, Subasree, G, Harini, M, Senthil Kumar
Traction Voltage Level in Two-Wheelers: Considerations on Safety and Performance2024-32-006204/18/2025
Most electric 2-wheelers on the market today seek to replace combustion engine vehicles from 50cc to 150cc which equates to an electric motor power between 2 and 12 kW. The traction voltage level of these vehicles is mostly between 44V and 96V. However, the actual choice of voltage on a specific vehicle seems to be arbitrary and higher voltage does not necessarily correlate with higher motor power. This paper seeks to highlight considerations and tradeoffs which feed the choice of traction voltage levels. Important criteria are electrical safety standards and their impact on vehicle electrical architecture, the performance and availability of key electronics parts such as capacitors, MOSFETs, and gate drivers, while also highlighting functional safety aspects. This paper shows by a comprehensive analysis of the motor drive that for the vehicle class mentioned above the traction voltage level can be kept below 60V without any performance impact, while also ensuring electrical and
Schmitt, Stefan
Necessity of Body Torsional Rigidity of Personal Mobility Vehicles (PMVs) with an Inward Tilting Mechanism2024-32-001304/18/2025
In traditional four-wheeled automobiles, the imbalance between the roll moment, which is the product of the centrifugal force during a turn acting on the center of gravity and the height of the center of gravity, and roll stiffness, which is the product of the left-right difference in tire vertical load and the tread width and commonly used among automotive suspension engineers, of the front and rear sections necessitates body torsional rigidity. However, there is a lack of specific cases and guidelines for constructing the body structure of three-wheeled PMVs (Personal Mobility Vehicles) with a tilting mechanism from the perspective of vehicle dynamics characteristics. In this paper, the basic considerations related to the dynamics of such three-wheeled PMVs are investigated. We use the term “torsional rigidity” to refer to the stiffness as the torsional deformation of the body itself, and the term “roll stiffness” to refer to the moment that counteracts the roll moment during a turn
Haraguchi, Tetsunori, Kaneko, Tetsuya
Nonlinear Joint Dynamic Estimator of Sideslip Angle and Tire-Road Peak Adhesion Coefficient Based on Improved Brush Tire Model2024-01-703312/13/2024
The sideslip angle and tire-road peak adhesion coefficient (TRPAC) are crucial parameters for intelligent active safety systems in automobiles. The accuracy and real-time estimation of these parameters significantly affect control effectiveness. And there is a strong coupling between the two parameters, which brings great challenges to the joint estimation. This paper proposes a nonlinear dynamic estimator that pre-estimates tire lateral force to achieve synchronous estimation of sideslip angle and TRPAC. Additionally, to cope with sudden changes in road adhesion condition, a TRPAC preliminary estimation optimization algorithm is introduced. Moreover, an adaptive gain adjustment algorithm for the sideslip angle estimator is implemented to address large lateral excitation conditions. Simulation results on various road surfaces and under various lateral excitation conditions demonstrate that the proposed joint estimator enables accurate and rapid estimation of sideslip angle and TRPAC.
Zhao, Wenrui, Leng, Bo, Han, Yinfeng, Yu, Zhuoping, Xiong, Lu
SAE TOMORROW TODAY BRIEFS: How "Talking" Cyber Tires Make Driving Safer1347909/23/2024
What if your tires could talk? And your car would listen? Pirelli's new Cyber Tyres use Bluetooth-connected sensors to communicate directly with the car, using data to make adjustments in real time. This information - including temperature and pressure - is vital when it comes to increasing safety. To learn more, Roberto Baldwin, Sustainability Editor, SAE Sustainable Mobility Solutions, sat down with Pierangelo Misani, Global Head of R&D for Pirelli, to discuss how this game-changing technology and the company's partnership with Bosch is shifting connected tire technology from reactive to proactive. For more information on the evolution of sustainability, head on over to sustainablecareers.sae.org. There, you can check out our interview with the Polestar CEO about the future of charging.
Hineman, Marcie
A Predictive Approach to Estimate Tyre Wear Characteristics2024-26-031301/16/2024
Tyre wear is a significant concern for the automotive industry due to multiple reasons that include vehicle performance, safety, economy, environmental (particulate matter emission) aspects, etc. Therefore, ensuring higher tyre tread wear resistance is one of the most important criteria while developing a new tyre. Tyre wear phenomenon is influenced by various factors, such as, road conditions, driving habits, maintenance practices and tyre design parameters (construction, geometry and material). The wear assessment through classical field-testing approach consumes significant time and resources. Therefore, digital predictive tools are very useful in predicting wear characteristics at the early stage of tyre development process. In this study, an attempt has been made to capture the impact of tread geometry, tread material, vehicle geometry, vehicle speed, test track geometry, etc. on tyre wear. A commercial finite element code, Abaqus was utilized for tyre structural simulation and
Bedi, Vinay Kumar, Rana, Kashif, Mahata, Pundarik, Ghosh, Prasenjit, Mukhopadhyay, Rabindra
A novel approach for Combi Braking System design considering tire's nonlinear behavior2024-26-005801/16/2024
The standard usage of Combined Braking System (CBS) in lower cc/power 2-wheeler vehicles serves to reduce stopping distance and improve braking stability. The CBS system achieves this by engaging both the front and rear wheel brakes, taking advantage of the high load transfer characteristic during 2-wheeler braking. However, the current design of the CBS system relies on linear system analysis, based on vehicle geometry, load distribution, and tire-road friction. This approach overlooks the non-linearities inherent in braking dynamics, such as tire behavior and dynamic Center of Gravity (CoG) location. Consequently, the current CBS design methodology exhibits limitations, particularly in extreme scenarios where wheel lock-up may occur, such as on low friction surfaces or during panic braking. This paper proposes the incorporation of tire non-linearities into the design of CBS systems using Pacejka's tire model. Initially, calculations are performed to optimize the braking
Khandekar, Piyush, Badiger, Kartik, Gautam, Ashish, Soni, Lokesh
Airless tyres in the LEON-T project: How can they be modelled?2024-26-037501/16/2024
For more than a century, pneumatic (air-inflated) tyres have totally dominated the market for road vehicle tyres. However, in the recent two decades, interest has grown in developing airless tyres. Some of the authors were involved in design of an early version in composite material 15-30 years ago for passenger cars. Presently, the EU project LEON-T includes a part in which prototypes for innovative heavy goods vehicle (HGV) tyres are developed, with the main purpose to reduce noise emission by 6 dB. To reduce noise that much it is believed that airless tyres are needed. A special challenge is to get a durable design able to carry typical truck tyre loads. This paper introduces the principal design of airless tyres. Airless tyre prototypes are intended to be developed by partner Euroturbine, in cooperation with mainly Applus+ IDIADA, VTI and subcontractor Lightness by Design. The tyre consists of a rim, load-carrying spokes, composite belt and rubber tread. The primary focus is on the
Anantharamaiah, Bharath, Fragerberg, Linus, Sandberg, Ulf, Hansson, Hans-Erik, Garcia, Juan J.
Tire-Rim Impact failure prediction using mathematical model2024-26-031401/16/2024
Early design or concept phase involve decision of key Chassis & Suspension parameters finalization, in which tire size selection is one of the most important aspect. Tire size affects overall vehicle ride & handling, steering performance and styling. In addition, it will dictate the majority of suspension packaging in subsequent design phase. An improper tire size selection can lead to major design changes in later stages and cause delay in the project deliverables. Conventional method of tire size selection mainly based on load rating using Tire standards like ETRTO, JATMA etc. is sufficient for vehicle application & basic durability point of view but lacks the insight for typical tire-rim impact failure mode. Aim of the study is to develop the methodology of predicting durability failure especially kerb strike event using simplified suspension-tire mathematical model, which will help in selection of optimal tire size or its specifications in early design phase to mitigate the impact
Atal, Abhishek, Lakhera, Vivek
A Study on Traction Battery Mounting Arrangements in Different EV Buses2024-26-012101/16/2024
This paper provides an overview of the different types of traction battery mounting arrangements available in electric buses globally. The paper describes a key comparison of all the types of traction battery mounting strategies used in EV buses along with their dominance and limitations. In EV buses, bigger sized batteries are used which directly affect vehicle architecture, assembly & serviceability. On the other hand, larger-sized batteries are used in buses which carries heavy mass, which influences vehicle dynamics & performance characteristics such as vehicle ride, handling, braking & NVH. The most important consideration in EV vehicles is safety, which comes in first place, so this paper gives some ideas to carefully design battery mounting arrangements for EV bus applications. There has been seen a very positive adaptation of EV buses in the last few years due to the rise in Co2 and global warming. Many EV bus manufacturers have entered the market with their innovative ideas of
Jain, Gaurav, Pathak, Rahul, Gore, Pandurang
Vehicle Dynamics Simulation Correlation : Impact of Flexible Tyre and Flexible Frame in Comfort Prediction of Two Wheelers Motorcycles and Scooters2024-26-005301/16/2024
For any two wheeler vehicle development, rider and pillion comfort while driving the vehicles over different kinds of road perturbations holds high importance. Designing a vehicle for comfort starts at the very beginning of its layout definition through vehicle geometric parameters, key hardpoints, mass-inertia distribution of subsystems and suspension characteristics. There is a need for highly reliable simulation models for comfort predictions as any change in layout during subsequent design stages is a very costly affair. Accurately predicting comfort using a full vehicle model is a challenging task though as it depends on how realistic the Simulation Model is to that of actual vehicle. While suspension stiffness and damping characteristics remain critical parameters for the comfort, selection of tyres are known to hold equal importance in vehicle comfort. The details to which the tyres are captured in the simulation model and the formulation of tyre interaction with roads in a
Govindula, Srikanth, Pandey, Pradyumn, Saraswat, Udit, Mishra, Ashish
Generation of tire digital twin for virtual MBD simulation of vehicles for durability, NVH and handling evaluation2024-26-030101/16/2024
With the recent development in virtual modelling and vehicle simulation technology, many OEM's worldwide are using digital road profiles in virtual environment for vehicle durability load prediction and virtual design evaluation. For precise simulation results, it is important to have the tire digital twin which is the realistic representation of tire in the virtual environment. The study comprises of discussion about different types of tire models such as empirical, solid model, rigid ring model and flexural ring models such as Pacejka, MF Swift, CD tire, F tire etc. and also the complexity involved in development of these tire models. Generation of virtual tire model requires highly sophisticated test rigs as well as vehicle level testing with Wheel Force transducers and other vehicle dynamics sensors. The large number of data points generated with testing are converted in standard TYDEX format to be further processed in various software tool for virtual model generation. Thus, a
Bakal, Nikhil
Recurrent Neural Network Model for On-Board Estimation of the Side-Slip Angle in a Four-Wheel Drive and Steering Vehicle15-17-01-000309/23/2023
Abstract A valuable quantity for analyzing the lateral dynamics of road vehicles is the side-slip angle, that is, the angle between the vehicle’s longitudinal axis and its speed direction. A reliable real-time side-slip angle value enables several features, such as stability controls, identification of understeer and oversteer conditions, estimation of lateral forces during cornering, or tire grip and wear estimation. Since the direct measurement of this variable can only be done with complex and expensive devices, it is worth trying to estimate it through virtual sensors based on mathematical models. This article illustrates a methodology for real-time on-board estimation of the side-slip angle through a machine learning model (SSE—side-slip estimator). It exploits a recurrent neural network trained and tested via on-road experimental data acquisition. In particular, the machine learning model only uses input signals from a standard road car sensor configuration. The model
Giuliacci, Tiziano Alberto, Ballesio, Stefano, Fainello, Marco, Mair, Ulrich, King, Julian
Recurrent Neural Network Model for On-Board Estimation of the Side-Slip Angle in a Four-Wheel Drive and Steering Vehicle15-17-01-0003-TEST-REC09/23/2023
Abstract A valuable quantity for analyzing the lateral dynamics of road vehicles is the side-slip angle, that is, the angle between the vehicle’s longitudinal axis and its speed direction. A reliable real-time side-slip angle value enables several features, such as stability controls, identification of understeer and oversteer conditions, estimation of lateral forces during cornering, or tire grip and wear estimation. Since the direct measurement of this variable can only be done with complex and expensive devices, it is worth trying to estimate it through virtual sensors based on mathematical models. This article illustrates a methodology for real-time on-board estimation of the side-slip angle through a machine learning model (SSE—side-slip estimator). It exploits a recurrent neural network trained and tested via on-road experimental data acquisition. In particular, the machine learning model only uses input signals from a standard road car sensor configuration. The model
Giuliacci, Tiziano Alberto, Ballesio, Stefano, Fainello, Marco, Mair, Ulrich, King, Julian
Topological Optimization of Non-Pneumatic Unique Puncture-Proof Tire System Spoke Design for Tire Performance15-17-01-000107/18/2023
Abstract Non-pneumatic tires (NPTs) have been widely used due to their advantages of no occurrence of puncture-related problems, no need of air maintenance, low rolling resistance, and improvement of passenger comfort due to its better shock absorption. It has a variety of applications as in earthmovers, planetary rover, stair-climbing vehicles, and the like. Recently, the unique puncture-proof tire system (UPTIS) NPT has been introduced for passenger vehicles segment. The spoke design of NPT-UPTIS has a significant effect on the overall working performance of tire. Optimized tire performance is a crucial factor for consumers and original equipment manufacturers (OEMs). Hence to optimize the spoke design of NPT-UPTIS spoke, the top and bottom curve of spoke profile have been described in the form of analytical equations. A generative design concept has been introduced to create around 50,000 spoke profiles. Finite element model (FEM) model is developed to evaluate the stiffness and
Dhrangdhariya, Priyankkumar, Maiti, Soumyadipta, Rai, Beena
Topological Optimization of Non-Pneumatic Unique Puncture-Proof Tire System Spoke Design for Tire Performance15-17-01-0001-TEST-REC07/18/2023
Abstract Non-pneumatic tires (NPTs) have been widely used due to their advantages of no occurrence of puncture-related problems, no need of air maintenance, low rolling resistance, and improvement of passenger comfort due to its better shock absorption. It has a variety of applications as in earthmovers, planetary rover, stair-climbing vehicles, and the like. Recently, the unique puncture-proof tire system (UPTIS) NPT has been introduced for passenger vehicles segment. The spoke design of NPT-UPTIS has a significant effect on the overall working performance of tire. Optimized tire performance is a crucial factor for consumers and original equipment manufacturers (OEMs). Hence to optimize the spoke design of NPT-UPTIS spoke, the top and bottom curve of spoke profile have been described in the form of analytical equations. A generative design concept has been introduced to create around 50,000 spoke profiles. Finite element model (FEM) model is developed to evaluate the stiffness and
Dhrangdhariya, Priyankkumar, Maiti, Soumyadipta, Rai, Beena
Tire simulation to optimize road noise2025-01-011105/05/2023
Tires have a significant impact on vehicle road noise. In the past, tire development has been driven by testing that is costly and time-consuming. Simulation approaches are becoming more important as the need for NVH performance requirements rises and vehicle development cycles get shorter. Therefore, simulation techniques should be used to tires at an early stage. Among various road noise, the noise of 80~160 Hz is easily felt when driving on the rough road, and this noise has a great relationship with the tire structural design. How to improve the road noise problem through tire simulation has become an important issue, so this paper puts forward the concept of virtual tire design and clarifies the responsibility of automotive enterprises and tire suppliers. In virtual tire design or tuning, an appropriate tire model is crucial for road noise performance. The CDtire model can meet the requirements, so in this article, CDtire is used to improve road noise at 80-120Hz. To obtain an
zhang, Ben, Yu Sr, Jing, Chen, Qimiao, Liu, Xianchen, Gu, Perry
SAE TOMORROW TODAY: Sustainable Rubber Hits the Road1337902/03/2023
When the rubber hits the road, one tire company stands out among the rest. From raw material traceability to supply chain transparency, Goodyear Tire & Rubber Company is not only helping to do what's good for business, but what's good for the planet, too. Driven by an ambitious sustainability strategy, Goodyear has set goals to develop a tire made of 100% sustainable materials by 2030 and using only renewable energy in its manufacturing facilities and operations by 2040. The company is even working to develop a domestic source of natural rubber from a specific species of dandelion in collaboration with the Department of Defense, the Air Force Research Lab, BioMADE and Farmed Materials. To learn more about Goodyear's impressive sustainability journey, we sat down with Ellis Jones, Vice President and Chief Sustainability Officer. He discusses the company's uniquely strong culture, the importance of working collaboratively with small farms, and the development of new sustainable tire
Hineman, Marcie
Investigation and Analysis of Brake Factor variation and its relation with Brake Pulling.2022-01-117109/19/2022
Vehicles pull during braking can be defined as the deviation of vehicle travel from intended path of the vehicle by a margin of half a wheel track or more. It is a dynamic phenomenon with very complex inter-dependencies among the combined functioning of various aggregates such as steering system, suspension system, axles, brakes. The problem is aggravated with shorter wheelbase & higher CG (Centre of Gravity) height, where the instantaneous load transfers are sudden and of relatively high magnitude which can lead to a combination of forces that are responsible for vehicle drifting or pulling to anyone side of center-line travel. Vehicle with shorter wheelbases, high GVW and high CG heights are more prone to this unstable behavior due to sudden change in dynamic forces acting on the tires while turning and braking. Although these vehicles have some disadvantages, they are required for important applications such as stage and intercity operations and hence cannot be stopped producing due
Pandey, Prashant, Pujari, Sachin, Nagrikar, Ravi
Applying Forensic Cost Analysis Methods to Medical DevicesTBMG-4656008/01/2022
Forensic cost analysis methods have already gained traction in the automotive industry, which has long recognized the value of determining an accurate cost of components and assemblies based on realistic labor and materials costs, as well as the physics of manufacturing processes. What you might not know is that the lessons learned from automotive costing easily transfer to medical products, devices, and equipment.
Field Safety Performance of Micro-mobility Devices2022-01-103103/29/2022
Micro-mobility devices, such as E-scooters and E-bikes, have become a prominent mode of transportation in urban environments. Even in a single location, a variety of suppliers, each with a different design, may be available for use. When new, the safety performance of the devices should be consistent for a given make, however, over time, braking performance may diminish. Acceleration characteristics may vary between suppliers, and could diminish over the life of the device, or possibly be dependent on the current state of charge of the device. Since the rider does not own or maintain the device, they would have limited understanding of the performance of a particular device in emergency conditions. A sample of publicly available E-scooters and E-bikes were tested to determine whether differences in acceleration and hard braking capabilities may be expected. The condition of the device tires and controls, and the battery state of charge, were inspected and documented. The findings are
Larson, Robert, Kuzel, Michael
Design Optimization of Bicycle Wheel Hub Assembly for Automotive Applications2022-01-030503/29/2022
The diminutive rolling resistance and wheel bearing drag characteristics of a bicycle wheel assembly makes it a lucrative choice of component in numerous 3-wheeled (3W) and 4-wheeled (4W) automotive applications. However, when a bicycle wheel is subjected to the loads encountered in such applications, complications pertaining to strength, durability and, performance are encountered. Since a bicycle wheel is intended to be arrested at either end of its axle, cantilever loading of the component as practiced in automotive applications diminishes the ability of the spindle to withstand longitudinal, and vertical forces encountered. Furthermore, while cornering on a bicycle, the maneuver of leaning in a corner significantly reduces the lateral stiffness requirement of the hub flanges. Therefore generic hub assemblies are designed without accounting for the action of lateral forces that are experienced at the hub with the wheel held vertical. Since most bicycle wheel assemblies are designed
Chakraborty, Apurva, R, Shreyas, Kanhai, Palash
Medium- and heavy-duty value of technology improvement 2022-01-064303/29/2022
Improvements in vehicle technology have an impact on the purchase price of the vehicle and its operating cost. In this study, we assume the monetary benefit of a technology improvement includes the potential reduction in vehicle price from using cheaper or smaller components, as well as the discounted value of the fuel cost savings. As technology progresses over time, the value and benefit of improving technology varies as well. For example, when a battery is heavy and expensive, a percentage increase in energy density and percentage reduction in cost are worth more than when the battery is already lighter and cheaper. In this study, we look at the value of a few technologies (battery energy density, electric drive efficiency, tire rolling resistance, aerodynamics, light weighting) and assign a dollar value to its associated savings. We show how the dollar value changes with the level of technology achievement, the powertrain selection and the vehicle type. We highlight for instance
Freyermuth, Vincent, Vijayagopal, Ram, Rousseau, Aymeric
Influence of Tyre Rolling Resistance and Operational Parameters on Vehicle Fuel Efficiency2021-26-050309/22/2021
There has been a persistent demand for Vehicle fuel efficiency improvement, mainly due to ever-increasing fuel price and imposition of stricter regulatory norms to curb greenhouse gas emissions. Factors like driving style, vehicle weight, engine, tyre, aerodynamics, weather conditions, etc. affect fuel efficiency. This study focuses on the impact of certain sub-parameters like tyre construction, tyre wear, inflation pressure and driver behavior to establish a correlation between the Rolling Resistance Coefficient (RRC) of a tyre and the fuel efficiency of the vehicle. Tyres with contrasting RRC are considered with multiple drivers and driving conditions while measuring Fuel efficiency using test cycles defined as Constant Speed Test (CST), Mixed Cycle Test (MCT) and Public Road Test (PRT). Fuel consumption sensitivity to driving behavior or driving aggressiveness varies even within expert drivers [1][2]. Reduction in Non-Skid Depth due to tyre wear adversely affects its properties
TOMER, AVINASH, Chepyala, Shiva Kumar Reddy, Mukhopadhyay, Rabindra, Ghosh, Prasenjit
Coastdown Road Load Coefficients of Passenger Vehicles – Variation Analysis and its Correlation with Temperature2021-26-048709/22/2021
Road Load parameters (rolling resistance & aerodynamic drag) of a vehicle have strong impact on overall Vehicle Emissions & Fuel Economy. The road load coefficients are simulated on chassis dynamometer to carryout emission & fuel economy measurement and are hence required to be found beforehand. A realistic measure of road load parameters can be obtained by conducting a coastdown test. Coastdown test results are hugely impacted by various environmental parameters like ambient temperature, atmospheric pressure, wind speed etc. Though performed in standard boundary conditions, results of multiple tests performed on a vehicle vary from one another due to variations in the mentioned environmental parameters over & above standard test to test variation. This paper aims at studying the variation in test results due to ambient temperature as one of the parameters responsible. For this study, road load coefficients from more than 100 coastdown tests conducted on oval test track for almost 30
Kuhar, Saurabhh, Pattalwar, Ashutosh, Gupta, Parveen
Model-Based System Engineering Approach for Steering Feel Simulation for Passenger Vehicles2021-26-040009/22/2021
The basic function of steering system is to control the direction of the vehicle. The driver applies effort on the steering wheel and receives feedback through the steering system as a result of tire to road interaction. This feedback consists of a haptic (force) feedback which is directly felt by the driver and it is termed as steering feel. Precise steering feel gives better driving experience and is decisive factor for customer to buy a vehicle as well as for OEMs in building brand image. Along with steering parameters, suspension and tire parameters also has significant impact on steering feel. In past, modelling of the steering system was done at component level or with simplified vehicle system. Such approaches had not given accurate results of steering feel metric and resulted in incorrect steering design parameter selection. In order to replicate actual vehicle characteristics, complex and detailed modelling of steering, tire and suspension subsystems is necessary. This study
Kulkarni, Parag Vijay, Dhiman, Vipin, Iqbal, Shoaib, Salunkhe, Swapnil
Minimum Operational and Maintenance Responsibilities for Aircraft Tire UsageARP5265C (Current)09/20/2021
This SAE Aerospace Recommended Practice (ARP) sets forth criteria for the installation, inflation, inspection, and maintenance of aircraft tires and the maintenance of the operating environment to ensure the safety of support personnel and the safe operation of the aircraft.
A-5C Aircraft Tires Committee
Minimum Operational and Maintenance Responsibilities for Aircraft Tire UsageARP5265C-TEST-REC (Historical)09/20/2021
This SAE Aerospace Recommended Practice (ARP) sets forth criteria for the installation, inflation, inspection, and maintenance of aircraft tires and the maintenance of the operating environment to ensure the safety of support personnel and the safe operation of the aircraft.
A-5C Aircraft Tires Committee
Inverse Reconstruction of the Spatial Distribution of Dynamic Tire-Road Contact Forces in Time Domain Using Impulse Response Matrix Deconvolution for Different Measurement Types2021-01-106108/31/2021
In tire development, the dynamic tire-road contact forces are an important indicator to assess structure-borne interior cabin noise. This type of noise is the dominant source in the frequency range from 50-450 Hz, especially when rolling with constant angular velocity on a rough road. The spatial force distribution is difficult or sometimes even impossible to simulate or measure in practice. So, the use of an inverse technique is proposed. This technique uses response measurements in combination with a digital twin simulation model to obtain the input forces in an inverse way. The responses and model properties are expressed in the time domain, since it is specifically aimed to trace back the impact locations from road surface texture indents on the tire. In order to do so, the transient responses of the travelling waves as a result of these impacts is used. The framework expresses responses as a convolution product of the unknown loads and impulse response measurements. Tikhonov
Devriendt, Harald, Naets, Frank, Kindt, Peter, Desmet, Wim
On the Road Profile Estimation from Vehicle Dynamics Measurements2021-01-111508/31/2021
Ride comfort assessment is undoubtedly related to the interaction between the vehicle tires and the road surface. Indeed, the road profile represents the typical input for tire vertical load estimation in durability analysis and for active/semi-active suspension controller design. However, the road profile evaluation through direct experimental measurements involves long test time and excessive cost required by professional instrumentations to detect the road irregularities with sufficient accuracy. An alternative is shifting attention towards efficient and robust algorithms for indirect road profile evaluation. The object of this work aims at providing road profile estimation starting from vehicle dynamics measurements, through accessible and traditional sensors, with the application of a linear Kalman filter algorithm. The filter is designed and tuned by considering the pitch/bounce half-car models for the prediction phase and by measuring vertical accelerations and angular speeds
Vella, Angelo Domenico, Tota, Antonio, Vigliani, Alessandro
SAE TOMORROW TODAY: The Goodyear Tire & Rubber Company Rolls Forward with the Future of Mobility1301305/04/2021
Not just your grandfather's tire company, Goodyear is now shaping how people move in the future. On this episode, Erin Spring, Senior Director, New Ventures at The Goodyear Tire & Rubber Company, shares how the company is leading the way in predictive vehicle servicing to keep car and trucks safer, serviced and ready to GO!
Hineman, Marcie
Speed Planning System for Commercial Vehicles in Mountainous Areas2021-01-012604/06/2021
There are a large number of curves and slopes in the mountainous areas. Unreasonable acceleration and deceleration in these areas will increase the burden of the brake system and the fuel consumption of the vehicle. The main purpose of this paper is to introduce a speed planning and promotion system for commercial vehicles in mountainous areas. The wind, slope, curve, engine brake, and rolling resistances are analyzed to establish the thermal model of the brake system. Based on the thermal model, the safe speed of the brake system is acquired. The maximum safe speed on the turning section is generated by the vehicle dynamic model. And the economic speed is calculated according to the fuel consumption model. The planning speed is provided based on these models. This system can guide the driver to handle the vehicle speed more reasonably. According to the simulation, compared to cruise control, speed planning can save fuel consumption at a mean value of 9.13% in typical mountainous areas
Peng, Dengzhi, Fang, Kekui, Tian, Zhongpeng, Zhang, Yuxiao, Tan, Gangfeng
The Effect of Using the Same Tire Friction for Both Vehicles in Impact Speed Reconstructions2021-01-089904/06/2021
Most collision reconstructions implicitly assume the same tire/road friction coefficient for all vehicles, despite evidence that friction varies between tires, surfaces, and individual trials. Here we assess the errors introduced by an assumption of a single, universal friction coefficient when reconstructing a collision where vehicles actually had different tire frictions. We used Monte Carlo methods to generate 20,000 synthetic two-vehicle impacts and rest positions using different, randomized friction coefficients for each vehicle and randomized impact speeds. These rest positions were then used to reconstruct both vehicles’ impact speeds assuming a single, common friction coefficient. High and low bounds on the impact speeds were reconstructed using high and low bounds on the common friction. We found that more than 97% of the true impact speeds were in the ranges reconstructed using upper and lower friction bounds. The influence of the similar-friction assumption on the errors in
Heinrichs, Bradley E., Toscano, Dwayne
Speed Planning System for Commercial Vehicles in Mountainous Areas2021-01-0126-TEST-REC04/06/2021
There are a large number of curves and slopes in the mountainous areas. Unreasonable acceleration and deceleration in these areas will increase the burden of the brake system and the fuel consumption of the vehicle. The main purpose of this paper is to introduce a speed planning and promotion system for commercial vehicles in mountainous areas. The wind, slope, curve, engine brake, and rolling resistances are analyzed to establish the thermal model of the brake system. Based on the thermal model, the safe speed of the brake system is acquired. The maximum safe speed on the turning section is generated by the vehicle dynamic model. And the economic speed is calculated according to the fuel consumption model. The planning speed is provided based on these models. This system can guide the driver to handle the vehicle speed more reasonably. According to the simulation, compared to cruise control, speed planning can save fuel consumption at a mean value of 9.13% in typical mountainous areas
Peng, Dengzhi, Fang, Kekui, Tian, Zhongpeng, Zhang, Yuxiao, Tan, Gangfeng
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