Passenger comfort is a critical factor in user acceptance of autonomous vehicles (AVs). Despite existing methods for passenger comfort assessment, new approaches to assessing passenger comfort in AVs may be valuable to the automotive industry. In this paper, continuous pressing-based and discrete smartphone-based approaches for comfort assessment were designed and implemented in a user study. Participants used the two approaches to evaluate their comfort levels in an experimental study based on a high-fidelity autonomous driving simulator. Performances of the two approaches in assessing comfort levels were analyzed and compared. In general, the discrete approach showed better measurement repeatability and lower measurement bias than the continuous approach. The performance gap of the continuous approach could be reduced with proper post-processing measures. Discussions on the potential uses of the approaches were also raised.

Su, Haotian, Brooks, Johnell, Jia, Yunyi

Performance Enhancement of Semi-active Continuous Skyhook Control Using Chaotic Map Particle Swarm Optimization-Based Stability Augmentation System

15-16-01-0002

09/16/2022

Abstract Enhancing the performance of a ride-oriented algorithm to provide ride comfort and vehicle stability throughout different terrains is a challenging task. This article aims to improve the performance of the state-of-the-art continuous skyhook algorithm in coupled motion modes with an optimally tuned stability augmentation system (SAS). The tuning process is carried out using a chaotic map-initialized particle swarm optimization (C-PSO) approach with ride comfort and roll stability as a performance index. A large van model built-in CarSim is co-simulated with a C-PSO algorithm and control system designed in MATLAB. To realize the feasibility and effectiveness of the proposed system, a software-in-loop test is conducted on five complex ride terrains with different dominant vehicle body motion modes. The test results are compared against the passive system, four corner continuous skyhook control, and four corner type-1 fuzzy control. The test results confirm the effectiveness of

Rajasekharan Unnithan, Anand Raj, Subramaniam, Senthilkumar

Performance Enhancement of Semi-active Continuous Skyhook Control Using Chaotic Map Particle Swarm Optimization-Based Stability Augmentation System

15-16-01-0002-TEST-REC09/16/2022

Rajasekharan Unnithan, Anand Raj, Subramaniam, Senthilkumar

PASSENGER TO FREIGHTER CONVERSION AND ITS IMPACT ON THE ENVIRONMENTAL CONTROL SYSTEM

2022-26-125705/26/2022

As per the records from Air cargo traffic, the global volume of air freight increased rapidly in recent years with freight volumes reaching 55.9 million metric tons. The strong demand for converted freighters has been driven by a robust cargo market, one of the key factors that strongly influenced this factor was the growth of e-commerce which has been boosted by more online deliveries This paper discusses some of the key aspects that needs to be considered for passenger to Freighter conversion and its impact to the Environmental Control System of the Aircraft. One of the first design change will be to identify all the passenger amenities and remove them, depending on the Freighter configurations the air distribution needs to be modified or re-routed. Temperature needs for the Main Deck Cargo Compartment (MDCC) is much lower than the passenger variant, the temperature selection ranges for all temperature zones shall cover the natural environment with high comfort for occupants. MDCC

PATIL, ANAND

Development of high damping powertrain mount using thixotropic fluid

2022-01-073403/29/2022

Vibration isolation performance and damping performance of powertrain mount are important for improving NV and ride comfort performances of the vehicle, respectively. In this research, based on the principle of liquid sealed mounts, we focused on the fact that the ideal fluid viscosity differs depending on the input frequency. By combining the liquid resonance phenomenon and thixotropic fluid, we developed a technology that balances a high level between low dynamic spring rate and high damping, which are trade-off items for liquid sealed mounts. The thixotropic fluid was blended with ethylene glycol aqueous solution as a base solution and smectite nano-cray as a thixotropic agent. From the view point of the viscosity corresponding to the shear rate and the viscosity at the high shear point, the optimum concentration of smectite was shown to be 1.5 wt%. As a result of measuring the dynamic characteristics of the mount unit using this thixotropic fluid, the damping coefficient increased

Takaesu, Keita, Sogawa, Naoki, Kuwahara, Hiroki, HAYAKAWA, SEIJI

Research on vehicle ride comfort and suspension parameter optimization based on Modeling and simulation

2022-01-033103/29/2022

Vehicle ride comfort is mainly to keep the impact of vibration and impact environment on occupant comfort within a certain limit.Therefore, ride comfort is mainly evaluated according to the subjective comfort of passengers.The most basic evaluation method is weighted root mean square acceleration to evaluate the impact of vibration on human comfort and health.The main influencing factors on vehicle ride comfort include the excitation of road surface and the parameters of vehicle suspension itself.Firstly, the vehicle is simplified as a mass system, and the human body seat system is added to the existing general simplified system to analyze the influencing factors of ride comfort.Then the pavement excitation modeling is carried out. The model acquisition method adopts the filtered white noise method with small amount of calculation and high efficiency. To explore the impact of road incentive on vehicle ride comfort.Then the dynamic model of vehicle vibration is established. The

Ding, Shousheng, Wang, Chu, Ji, Yun Xiao

Control strategy for ISD suspension considering dynamic vibration absorber of wheel motor

2022-01-033203/29/2022

Vehicles driven by in-wheel motors have the advantages of compact structure and high transmission efficiency, which is one of the most ideal energy-saving, environmentally friendly and safe driving forms in the future. However, the addition of the in-wheel motor significantly increases the unsprung mass of the vehicle, resulting in a decrease in the mass ratio of the vehicle body to the wheel, which will deteriorate the ride comfort and safety of the vehicle. To improve the vibration performance of in-wheel motor vehicles, a semi-active inerter-spring-damping(ISD) suspension based on in-wheel motor vibration absorption is proposed in this paper. Firstly, mounting elements are applied to the wheel to provide elastic isolation between the in-wheel motors and the tyre, which converts the in-wheel motor mass into a vibration absorber to suppress the high-frequency vibration of the unsprung mass. Secondly, an ISD suspension is used to improve the low and mid-frequency characteristics of the

Zhang, Kaidi, Wu, Jinglai, Zhang, Yunqing

Active control of Camber and Toe angles to improve vehicle Ride Comfort

2022-01-112003/29/2022

This paper is part of the European OWHEEL project. It proposes a method to improve the comfort of a vehicle by adaptively controlling the Camber and Toe angles of a rear suspension. The purpose is achieved through two actuators for each wheel, one that allows to change the Camber angle and the other the Toe angle. The control action is dynamically determined based on the error between the reference angle and the actual angles. The reference angles are not fixed over time but dynamically vary during the manoeuvre. The references vary with the aim of maintaining a Camber angle close to zero and a Toe angle that follows the trajectory of the vehicle during the curve. This improves the contact of the tire with the road. This solution allows the control system to be used flexibly for the different types of manoeuvres that the vehicle could perform. An experimentally validated sports vehicle was used to carry out the simulations. The original rear suspension is a Trailing-arm suspension. It

Marotta, Raffaele, Strano, Salvatore, Terzo, Mario, Tordela, Ciro, Ivanov, Valentin

Bump steer and Brake steer optimization in steering linkages through TAGUCHI method DOE analysis

2021-26-007909/22/2021

Due to recent infrastructural development and emerging competitive automotive markets in India, there is seen a huge shift in customer’s demand and vehicle drivability pattern in commercial vehicle industry. Now apart from ensuring better vehicle durability and best in class tyre life and fuel mileage, a vehicle manufacturer also has to focus on other key attributes like driver’s safety and ride comfort. Thus, for ensuring enhanced drivability, key parameters for ensuring better vehicle handling includes optimization of bump steer and brake steer. Both bump steer and brake steer are vehicle’s undesirable phenomenon where a driver is forced to constantly make steering wheel correction in order to safely maneuver the vehicle in the desired path. Since both bump steer and brake steer are caused due to the interactions of several vehicle parameters such as – drop arm and steering arm hard point, suspension stiffness, suspension eye and shackle position, caster angle, draglink length etc

Chopra, Nitin, P, Mahadevan

Virtual tuning and optimization of two wheeler suspension through MBD simulations

2021-26-034809/22/2021

The design and tuning of stiffness and damping parameters of the suspension system is an essential step in arriving at the optimal riding comfort for a two wheeler. The conventional method of suspension design involves selecting baseline values of suspension parameters through bench-marking of similar vehicles, followed by extensive real life tests to tune these parameters over different load, speed and track conditions. This conventional approach is often time consuming and heavily dependent on physical prototypes of suspension. With the advent of tools to run optimization on Multi-Body Dynamic (MBD) simulations, a near complete tuning of suspension parameters can be performed entirely in the simulation domain. This paper presents an integrated approach towards the design and tuning of suspension stiffness and damping parameters using MBD simulations, by employing fully parameterized suspension stiffness and damping curves in the optimization process. The optimization is performed on

PK, Ram Kumar, Mishra, Ashish

Human Perception of Seat Vibration Quality Pilot Study

2021-01-106808/31/2021

Driving comfort and automotive product quality are strongly associated with the vibration that is transmitted to the occupants of a vehicle at the points of contact to the human body, including the seat, steering wheel, and pedals. Of these three contact locations, the seats have the most general importance, as all occupants of a vehicle experience seat vibration. Particularly relevant to driving comfort is the way in which vehicle occupants perceive seat vibration, which may be different than expected considering sensor measured vibration levels. Much of the interest in seat vibration has been focused on internal combustion engine powertrain vibration, especially idle vibration. However, electrification of vehicles changes the focus from low frequency idle vibration to higher frequency vibration sources. In this pilot study, the equal comfort curves for seat vibration were physically measured, which quantified perceived vibration amplitude as a function of amplitude and frequency with

Bastiaan, Jennifer, Green, Edward, Rengarajan, Revathi

On the Road Profile Estimation from Vehicle Dynamics Measurements

2021-01-111508/31/2021

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

Nearly Pain-Free Microneedle Patch

TBMG-3961008/01/2021

Doctors often use blood samples to check for biomarkers of disease such as antibodies or cytokines indicative of inflammation seen in conditions such as rheumatoid arthritis and sepsis.

SAE TOMORROW TODAY: Soaking Up the Sun: America's First Solar-Powered Town

1315607/29/2021

Welcome to Babcock Ranch: the hometown of the future. Powered entirely by 700,000 solar panels across 840 acres of land in sunny Florida, Babcock Ranch is an innovative town that combines everything Americana with the technologies of tomorrow: electric-powered ice cream trucks, city-wide WiFi, expansive public green spaces, and the comfort of being part of a community. Syd Kitson, Chairman and CEO of Kitson & Partners - the founders of Babcock Ranch - joined us to share how he turned his vision for the future into reality - while making it economically viable along the way.

Hineman, Marcie

An Optimized Design of Multi-Chamber Perforated Resonators to Attenuate Turbocharged Intake System Noise

2021-01-066904/06/2021

The turbocharger air intake noise during transient conditions like wide open throttle and tip-in/out affects the passenger ride comfort. This paper aims to study an optimized design of multi-chamber perforated resonators to attenuate this noise. The noise produced by a turbocharger in a test vehicle has been measured to find out the noise spectral characteristics which can be used to design the acoustic targets including the amplitude and frequency range of transmission loss (TL). The structural parameters of the resonators are optimized based on genetic algorithm (GA) and two-dimensional prediction theory of the resonator TL. The optimized resonators are installed on the test vehicle to verify the actual noise reduction effect. The results suggest that the broadband noise has been eliminated, and subjective feelings are greatly improved.

Guo, Rong, Luo, Rui

SAE TOMORROW TODAY: One Day Kids Will Play in the Streets Again

1290709/17/2020

What will cities look like as we come out of the COVID-19 pandemic? Ashwini Chhabra, Co-Founder & Principal of Electric Avenue, joins us this week to offer his take on how trends that have emerged during the shutdown can, and likely will, transfer as cities begin to open back up. First, we talk about Ashwini's background that has transitioned from the financial service sector to the New York City education system to the urban transportation space, and how he has applied private sector thinking to public sector problems. With Ashwini's background in education, the conversation looks at how schools in New York are taking advantage of available outside space and how prioritizing public space will play an important role in city planning. Ashwini discusses the importance of planning ahead to move people around in the ways they need to properly function the city by using all forms of transportation. The New York City subway system gets a long look as well with the need to rebuild confidence

Hineman, Marcie

Thin Film Electrodes Show Potential for Transforming Neurosurgery

TBMG-3759409/01/2020

Advances in thin film technology could soon offer a less invasive and more cost-effective solution to enhance neurosurgery for people with neurological brain conditions, including epilepsy.

The Effect of Change in Assembly Sequence on Permanent Strain of Cab Suspension Console

02-13-02-0011

08/20/2020

Heavy commercial vehicles play an important role in creating the trade and economic balance of countries. Also, the durability and safety of heavy commercial vehicles come to the fore. Heavy commercial vehicles consist of two parts. These are the chassis area with the equipment that allows the vehicle to move and the cabin section where the driver is located. The cabin area is the most important area that ensures the highest level of driver safety. Considering that the production of trucks is increasing day by day, it is inevitable for companies to increase their R&D activities in the field of cabin and cabin suspension systems for much safer, durable, and comfortable trucks. This study aims to determine the safe torque value of the fasteners and their assembly sequence of the Cab Suspension Console, which is one of the most important connection parts in a truck and which can cause a fatal accident by breaking. In this study, the safe torque value of the fasteners of the cabin

Yildirim, Bariscan, Öztürk, Dogan

Enhancement of Occupant Ride Comfort by GA Optimized PID Control Active Suspension System

2020-01-153206/03/2020

The main objective of this work is to enhance the occupant ride comfort. Ride comfort is quantified in terms of measuring distinct accelerations like sprung mass, seat and occupant head. For this theoretical evaluation, a 7- degrees of freedom (DOF) human-vehicle-road model was established and the system investigation was limited to vertical motion. Besides, this work also focused to guarantee other vehicle performance indices like suspension working space and tire deflection. A proportional-integral-derivative (PID) controller was introduced in the vehicle model and optimized with the aid of the genetic algorithm (GA). Actuator dynamics is incorporated into the system. The objective function for PID optimization was carried out using root mean square error (RMSE) concept. The severity of various suspension indices and biomechanics responses of the developed model under proposed approach were theoretically analyzed using various road profiles and compared with conventional passive

Anandan, Arivazhagan, K, Arunachalam

Sliding Mode Controlled Half Car Suspension System with Magnetorheological Damper

2020-01-154006/03/2020

Attenuation of vibrations caused by the road undulance conditions are tedious and very much related to human health and vehicle handling problems. One of the promised approaches to solving these problems in a vehicle suspension system is the use of effective controllers. In this paper, the sliding mode controller (SMC) is designed and used to control the magnetorheological (MR) damper. The performance of the proposed controller is verified by incorporating the controller in a half car vehicle suspension model. In a suspension damper design, Modified Bouc-Wen model is used to characterize the hysteretic behaviour of MR damper parameters. The voltage control algorithm is used to convert the desired force into the varied voltage input to the MR damper. The fail-proof advantage of MR damper is analysed by comparing the results of uncontrolled MR suspension with a passive system. In order to limit the pitch angle and to achieve the improved ride comfort and stability of the vehicle, the

SOOSAIRAJ, AROCKIA SUTHAN, K, ARUNACHALAM

5 Ws of the Infant Smart Jumpsuit

TBMG-3685105/01/2020

Those providing care or treatment of infants five months or older.

Microfluidics Device Detects Cancer Cells in Blood

TBMG-3683405/01/2020

The ability to successfully isolate cancer cells is a crucial step in enabling liquid biopsy where cancer could be detected through a simple blood draw. This would eliminate the discomfort and cost of tissue biopsies that use needles or surgical procedures as part of cancer diagnosis. Liquid biopsy could also be useful in tracking the efficacy of chemotherapy over the course of time, and for detecting cancer in organs difficult to access through traditional biopsy techniques including the brain and lungs.

Mobile, Wearable EEG Device with Nanowire Sensors

TBMG-3683805/01/2020

The electroencephalogram (EEG) is one of the few methods of visualizing brain function and is the mainstay of diagnosis of seizure disorders as well as many other neurologic conditions. Conventional EEG devices provide high-quality signals; that is, good signal-to-noise ratio. These devices, however, are not conducive to mobile real-world applications because they are wired devices that tether participants to a given location, limiting the activities they can perform. Furthermore, these devices are not amenable for long-term use because electrodes in these devices typically require electrolytic gel to make contact with the scalp. This dries out over time, thereby reducing signal quality and increasing discomfort due to dried salt deposits. There are currently no viable options for a research-grade EEG device that can be worn for prolonged periods of time and are mobile enough to benefit from participants’ real-world interactions.

An Image Recognition Application Method for Vertical Movement of Vehicles

2020-01-073304/14/2020

In ITS, image processing technology is applied to a wide variety of areas such as visual-based intelligent vehicle navigation, visual-based traffic monitoring and visual-based traffic management. In the recognition system of the vehicle body characteristics, most of the recognition is the license plate and the car emblem, etc. This paper proposes an image recognition application method for the vertical motion of the car while driving, mainly including vertical height detection and vertical displacement velocity acceleration recognition. The edge detection model of the image object is established by using the gray image to obtain the car motion segmentation image. At the same time, an image length and actual length coordinate conversion model is established, which can calculate an arbitrary actual length of the image object. In this paper, Yuejin Shangjun X500 van was selected as the test vehicle, and the video data was captured with a camera. In the static recognition test, the error

Li, Ming, Tan, Gangfeng, Wang, Zhenyu, Wang, Haoyu, Jiang, Yifeng, Guo, Donghua, Feng, Jiaming

A Novel Velocity Planner for Autonomous Vehicle Considering Human Driver’s Habits

2020-01-013304/14/2020

In automatic driving application, the velocity planner can be considered as a key factor to ensure the safety and comfort. One of the most important tasks of the velocity planner is to simulate the velocity characteristics of human drivers. In this paper, two Driver In-the-Loop (DIL) experiments are designed to explain velocity characteristics of human drivers. In the first experiment, static obstacles are placed on both sides of the straight road to shorten the cross range that vehicles can driver across. Moreover, different cross ranges are set to study the influence of the steering wheel error. In the second experiment, velocity characteristics are investigated under the condition of different road widths and curvatures in a U-turn road contour. In both tests, different drivers’ preview behavior is analyzed through the operation of throttle, braking, and steering. From the results we could see the change of vehicle speed depends largely on the traffic environment at the driver’s

Cui, Zongwei, Guo, Xuexun, Pei, Xiaofei

Perceptions of Two Unique Lane Centering Systems: An FOT Interview Analysis

2020-01-010804/14/2020

The goal of this interview analysis was to explore and document the perceptions of two unique lane centering systems (S90’s Pilot Assist and CT6’s Super Cruise). Both systems offer a similar type of functionality (adaptive cruise control and lane centering), but have significantly different design philosophies and HMI (Human-Machine Interface) implementations. Twenty-four drivers drove one of the two vehicle models for a month as part of a field operational test (FOT) study. Upon vehicle return, drivers took part in a 60-minute semi-structured interview covering their perceptions of the vehicle’s various advanced driver-assistance systems (ADAS). Transcripts of the interviews were coded by two researchers, who tagged each statement with relevant system and perception code labels. For analysis, the perception codes were grouped into larger thematic bins of safety, comfort, driver attention, and system performance. Perceptions of adaptive cruise control (ACC) were similar across vehicles

Landry, Steven, Seppelt, Bobbie, Russo, Luca, Mehler, Bruce, Angell, Linda, Gershon, Pnina, Reimer, Bryan

Decision Making and Trajectory Planning of Intelligent Vehicle’ s Lane-Changing Behavior on Highways under Multi-Objective Constrains

2020-01-012404/14/2020

Discretionary lane changing is commonly seen in highway driving. Intelligent vehicles are expected to change lanes discretionarily for better driving experience and higher traffic efficiency. This study proposed to optimize the decision-making and trajectory-planning process so that intelligent vehicles made lane changes not only with driving safety taken into account, but also with the goal to improve driving comfort as well as to meet the driver’ s expectation. The mechanism of how various factors contribute to the driver’s intention to change lanes was studied by carrying out a series of driving simulation experiments, and a Lane-Changing Intention Generation (LCIG) model based on Bi-directional Long Short-Term Memory (Bi-LSTM) was proposed. The inputs of the Bi-LSTM were data fragments of several influencing factors including the relative velocity and the distance between the relative vehicles, the type of the preceding vehicles, and the average velocity of the adjacent traffic

Nie, Linzhen, Yin, Zhishuai, Huang, Haoran

A Dynamic Trajectory Planning for Automatic Vehicles Based on Improved Discrete Optimization Method

2020-01-012004/14/2020

The dynamic trajectory planning problem for automatic vehicles in complex traffic scenarios is investigated in this paper. A hierarchical motion planning framework is developed to complete the complex planning task. An improved dangerous potential field in the curvilinear coordinate system is constructed to describe the collision risk of automatic vehicles accurately instead of the discrete Gaussian convolution algorithm. At the same time, the driving comfort is also considered in order to generate an optimal, smooth, collision-free and feasible path in dynamics. The optimal path can be mapped into the Cartesian coordinate system simply and conveniently. Furthermore, a velocity profile considering practical vehicle dynamics is also presented to improve the safety and the comfort in driving. The effectiveness of the proposed dynamic trajectory planning is verified by numerical simulation for several typical traffic scenarios.

Zeng, Pengyun, Ling, Zheng

Human-Driving Highway Overtake and Its Perceived Comfort: Correlational Study Using Data Fusion

2020-01-103604/14/2020

As an era of autonomous driving approaches, it is necessary to translate handling comfort - currently a responsibility of human drivers - to a vehicle imbedded algorithm. Therefore, it is imperative to understand the relationship between perceived driving comfort and human driving behaviour. This paper develops a methodology able to generate the information necessary to study how this relationship is expressed in highway overtakes. To achieve this goal, the approach revolved around the implementation of sensor Data Fusion, by processing data from CAN, camera and LIDAR from experimental tests. A myriad of variables was available, requiring individuating the key-information and parameters for recognition, classification and understanding of the manoeuvres. The paper presents the methodology and the role each sensor plays, by expanding on three main steps: Data segregation and parameter selection; Manoeuvre detection and processing; Manoeuvre classification and database generation. It

Carello, Massimiliana, Ferraris, Alessandro, de Carvalho Pinheiro, Henrique, Cruz Stanke, Diego, Gabiati, Giovanni, Camuffo, Isabella, Grillo, Massimo

Analysis of Personal Routing Preference from Probe Data in Cloud

2020-01-074004/14/2020

Routing quality always dominates the top 20% of in vehicle- navigation customer complaints. In vehicle navigation routing engines do not customize results based on customer behavior. For example, some users prefer the quickest route while some prefer direct routes. This is because in vehicle navigation systems are traditionally embedded systems. Toyota announced that new model vehicles in JP, CN, US will be connected with routing function switching from the embedded device to the cloud in which there are plenty of probe data uploaded from the vehicles. Probe data makes it possible to analyze user preferences and customize routing profile for users. This paper describes a method to analyze the user preferences from the probe data uploaded to the cloud. The method includes data collection, the analysis model of route scoring and user profiling. Furthermore, the evaluation of the model will be introduced at the end of the paper. The analysis not only focuses on the routes chosen by the

Jin, Xin, Takayama, Toshinori, Yashiro, Ai, Nakamura, Taiki

Influence of Background Spectral Distribution on Perceptions of Discomfort Glare

2020-01-063704/14/2020

The advent of light-emitting diode (LED) technology for automotive lighting allows flexibility of the spectral distribution of forward headlighting systems, while meeting current requirements for “white” illumination. As vehicle headlights have become whiter (with more short-wavelength light output) over the past several decades, their potential impacts on visual discomfort for oncoming and preceding drivers have been hotly debated. It is known that a greater proportion of short-wavelength energy increases discomfort glare, and that increasing the background light level (e.g., through roadway lighting) will decrease perceptions of discomfort. More recently it has been demonstrated that the visual system exhibits enhanced short-wavelength sensitivity for perceptions of scene brightness. As a result, roads illuminated by light sources with higher correlated color temperatures (CCTs) will be judged as appearing to be brighter than those illuminated to the same light level by sources with

Nagare, Rohan M., Bullough, John D.

Human Response to Vibrations and Its Contribution to The Overall Ride Comfort in Automotive Vehicles – A Literature Review

2020-01-108504/14/2020

The various factors that affect ride comfort have been in focus in many research studies due to an increasing demand in ride comfort in the automotive industry. Noise, vibration and harshness (NVH) and the human response to NVH has been highlighted as an important contribution to assess and predict overall ride comfort. The purpose of this paper is to present an approach to explain ride comfort with respect to vibration for the seated occupant based on a systematic literature review of previous fundamental research and to relate these results to the application in the contemporary automotive industry. The results from the literature study show that numerous research studies have determined how vibration frequency, magnitude, direction, duration affect human response to vibration. Also, the studies have highlighted how body posture, age, gender and anthropometry affect the human perception of comfort. An analysis was made of the consistency and inconsistency of the results obtained in

Wang, Xiaojuan, Osvalder, Anna-Lisa, Höstmad, Patrik, Johansson, Ingemar

Smartphone Lab Delivers Test Results in ‘Spit’ Second

TBMG-3641304/01/2020

Using your phone to diagnose disease or track your medical condition is the holy grail for remote health monitoring. So far it’s been impractical to combine the two in a single device. Tech companies don’t want the regulatory headaches that would come from labeling phones as medical devices.

Mechanical Controller for Robot-Assisted Surgery

TBMG-3636304/01/2020

Robot-assisted surgery has advanced dramatically over the past decade in almost every surgical sub-specialty. Robot-assisted surgery is usually performed using surgical robot systems that involve a master-slave configuration in which the “master” is a controller device that the surgeon manipulates to control a robotic arm. Such systems improve the dexterity and precision of surgeons by filtering out hand tremors and scaling their hand motions into smaller movements. They also reduce the risk of common surgical complications such as surgical site infection.

Heat-Regulating Material for Next-Generation Space Blanket

TBMG-3572012/01/2019

Drawing design inspiration from the skin of squid, researchers developed an adaptive space blanket that gives users the ability to control their temperature. The drawback to current Mylar heat-regulating blankets is static. The new material has changeable properties to regulate how much heat is trapped or released.

Ride-Comfort Analysis for Commercial Truck Using MATLAB Simulink

2019-28-242811/21/2019

Ride Comfort forms a core design aspect for suspension and is to be considered as primary requirement for vehicle performance in terms of drivability and uptime of passenger. Maintaining a balance between ride comfort and handling poses a major challenge to finalize the suspension specifications. The objective of this project it to perform ride- comfort analysis for a commercial truck using MATLAB Simulink. First, benchmarking was carried out on a 4x2 commercial truck and the physical parameters were obtained. Further, a mathematical model is developed using MATLAB Simulink R2015a and acceleration- time data is collected. An experimentation was carried out on the truck at speeds of 20 kmph, 30 kmph, 40 kmph and 50 kmph over a single hump to obtain actual acceleration time domain data. The model is then correlated with actual test over a single hump. This is followed by running the vehicle on Class A, B & C road profiles to account for random vibrations. Similarly, a simulation is done

Debnath, Sarnab, Bhanja, Subrat, Achanta, Krishna, Jain, Pranay, Bharti, Sumit, Agrewale, Mohammad Rafiq

Ride Index Structure and Development Methodology

J2834_201910 (Current)

10/09/2019

This recommended practice defines methods for the measurement of periodic, random and transient whole-body vibration. It indicates the principal factors that combine to determine the degree to which a vibration exposure will cause discomfort. Informative appendices indicate the current state of knowledge and provide guidance on the possible effects of motion and vibration on discomfort. The frequency range considered is 0.5 Hz to 80 Hz. This recommended practice also defines the principles of preferred methods of mounting transducers for determining human exposure. This recommended practice is applicable to light passenger vehicles (e.g., passenger cars and light trucks). This recommended practice is applicable to motions transmitted to the human body as a whole through the buttocks, back and feet of a seated occupant, as well as through the hands of a driver. This recommended practice offers a method for developing a ride performance index but does not specifically describe how to

Vehicle Dynamics Standards Committee