Browse Topic: Harshness

Items (29)

A novel framework for accelerating EDU NVH simulation using scalable transfer functions and evaluating manufacturing defects through space order excitation

2025-01-004405/05/2023

In the ultra-luxury vehicle segment, achieving optimal NVH (Noise, Vibration, and Harshness) performance across a growing range of load cases in drive and regeneration conditions presents significant engineering challenges. As the complexity of load cases escalates with varying torque ripple and transmission errors, traditional time and frequency-domain simulations become computationally inefficient. To address these challenges, an in-house software framework that employs Noise Transfer Functions (NTFs) and Vibration Transfer Functions (VTFs) is developed. The system’s dynamic response is computed once and scaled to various excitation sources, which includes radial and tangential forces derived from EMAG simulations, and gear forces derived from MBS simulation. Speed sweep simulation is performed to systematically characterize the RPM range, allowing for precise scaling of the transfer function against the original forces to obtain the responses in mounts or microphones. The resulting

Sureshkumar, Sanjai, Shaw, Stephen, Qureshi, Manucher, Duclaux de L'Estoille, Nicolas

Characterization and Prediction of Interior Noise Quality in Electric Vehicles through Drive Unit End-of-Line Testing (EOLT)

2025-01-003905/05/2023

This paper addresses the critical aspect of interior noise quality in electric vehicles (EVs), focusing on the characterization and prediction methodologies employed during drive unit end-of-line testing. The electric drive unit plays a pivotal role in determining the overall Noise, Vibration, and Harshness (NVH) quality of the final product. This study explores the impact of drive unit assembly process variation and individual component tolerance on the NVH characteristics of electric drive units, emphasizing their direct effect on overall vehicle acoustic quality and customer comfort. The research delves into the intricate relationship between drive unit vibrational response, vehicle interior noise, and customer subjective perception, providing valuable insights into their correlation and how they collectively influence user experience and satisfaction. It aims to enhance the understanding of how electric drive unit characteristics contribute significantly to the interior noise

Arvanitis, Anastasios, Parbat, Aniket, Jadhav, Prashant, Raphael, Andrew

Road noise analysis using Component TPA and FBS with vehicle component modifications

2025-01-005505/05/2023

Road noise caused by road excitation is a critical factor for vehicle NVH (Noise, Vibration, and Harshness) performance. However, assessing the individual contribution of components, particularly bushings, to NVH performance is generally challenging, as automobiles are composed of numerous interconnected parts. This study describes the application of Component Transfer Path Analysis (CTPA) on a full vehicle to provide insights into improving NVH performance. With the aid of Virtual Point Transformation (VPT), blocked forces are determined at the wheel hubs; afterward, a TPA is carried out. As blocked forces at the wheel hub are independent of the vehicle dynamics, these forces can be used in simulations of modified vehicle components. These results allow for the estimation of vehicle road noise. To simulate changes in vehicle components, including wheel/tire and mount bushings, Frequency-Based Substructuring (FBS) is used to modify the vehicle setup in a simulation model. In this

Kim, Jungu, Reichart, Ron, de Klerk, Dennis, Schütler, Willem, Malic, Mario, Kim, Hyeongjun, Kim, Uije

Leveraging Vision Language Models for Automated NVH Analysis

2025-01-012705/05/2023

Optimizing Noise, Vibration, and Harshness (NVH) is crucial in the automotive industry. Traditional analysis methods, including time series analytics and frequency spectrum analysis, as well as advanced techniques like time-frequency spectrogram analysis, are often time-consuming and rely heavily on expert interpretation. This research explores the potential of Vision Language Models (VLMs) specifically LLaMA 3.2 Vision, GPT-4o, and Microsoft Phi-3 vision for automating noise spectrogram analysis. By employing techniques such as few-shot learning and fine-tuning these models on a curated dataset of spectrograms paired with expert interpretations, we aim to facilitate rapid and accurate NVH assessments and report generation. The proposed approach includes assembling a dataset derived from vibration sensors and expert analyses to inform model training. Furthermore, we will evaluate the accuracy and reliability of the trained models to ensure robust performance. The techniques discussed

CHANDRASEKARAN, BALAJI, Cury, Rudoniel

Metamaterials R&D TARGETS NVH ABATEMENT

21AUTP05_0405/01/2021

Nissan readies its lightweight acoustic solution for 2022 production - will Hyundai follow? Acoustics engineers have a broad variety of materials from which to choose for reducing noise, vibration and harshness (NVH) in vehicles. But their selection often comes with a measurable downside: added mass. It's not uncommon for a new vehicle to gain 100 lb (45 kg) or more during development as various absorbers, reflective barriers and absorber-barrier combinations - typically baked-on mastics, blankets, injected foams and acoustic glazing - are brought to bear. In an era where “lightweighting rules” and engineers are rewarded on a per-gram basis for cutting vehicle weight, materials researchers are betting on new developments to win the NVH-versus-mass battle. So-called metamaterials offer significant promise here, with a potential added benefit of being less costly than the traditional NVH solutions used by OEMs.

Brooke, Lindsay

Linking Body-In-White and Trimmed Body Dynamic Characteristics in view of Body-In-White Mode Shape Target Setting

2020-01-155306/03/2020

Target setting at Body-In-White (BIW) level is typically done for natural frequencies of global modes. Target values are commonly set based on experience or from benchmark studies with competitor vehicles. A link between these targets at BIW level and the vibro-acoustic targets at Trimmed Body (TB) level is not yet well established. Therefore, it is not always guaranteed that the TB targets will be met when the targets at BIW level are reached. Also, the other way around, not reaching a frequency target for a certain BIW mode does not necessarily imply that TB targets will not be met. Hence, there is a clear need for getting more insights in the relation between BIW dynamic properties and TB vibration behavior. In this paper techniques will be presented that establish the link between BIW and TB dynamic behavior. In addition, a large DOE campaign has been carried out to further link these dynamic properties to specific areas in the body design. Key elements in this paper are the

Brughmans, Marc, Orlando, Stefano

Measurement Location Optimization of Component TPA Method for Road Noise

2020-01-158106/03/2020

In this paper, an investigation on the application of a non-intrusive on-site component Transfer Path Analysis (TPA) method is presented together with the comparison with a previously performed direct blocked forces method. The latter is the more common method to determine interface forces between active and passive parts of an assembly. Force transducers are placed between the investigated structure and a rigid measurement rig. The presented comparison shows an investigated whether the faster and cheaper TPA method was able to produce relevant results. The TPA method used in this work calculated the force component contributions, without disassembly of the interfaces, through the local stiffness of multiple indicator positions per interface combined with operational measurement. The method is based on the application of an inverse-matrix model. This approach was applied to a vehicle road noise investigation carried out on a roller bench at three different roller speeds. A rough

de Boer, Onno, Iturbe, Javier, Gagliardini, Laurent, Bragado Pérez, Beatriz

Using Statistical Energy Analysis to Optimize Sound Package for Realistic Load Cases

2020-01-152506/03/2020

The statistical energy analysis (SEA) is widely used to support the development of the sound package of cars. This paper will present a model prepared to investigate the sound package of the new Audi A3 and its correlation against measurements. Special care was given during the creation of the model on the representation of the structure to able the analysis of structure borne energy flow on top of the classical airborne analysis usually done with SEA. The sound package is also detailed in the model to allow further optimization and analysis of its performance. Two real life load cases will be presented to validate the model with measurements. First, the dominating powertrain and second, a case with dominating rolling noise. An analysis of the contribution of the different source components and a way to diagnose the weak paths of the vehicle will be presented. The focus of this investigation is the application of optimally adjusted treatment.

Venor, Joseph, Caillet, Arnaud, März, Christian, Martin, Simon, Fatmi, Oussama, Glavac, Matej

Automotive Engineering: June 2019

19AUTP0606/06/2019

Rethinking aluminum for NVH abatement Engineers, abandon those mastics! New "quiet" materials solutions are at hand. Paradigm shift in NVH A new wave of vehicle technologies is changing the way Brüel & Kjaer attacks noise, vibration and harshness. How a Tier 2 tackles NVH Saint-Gobain invested in anechoic testing so small components can make a big NVH difference. Reducing NVH through refined powertrain measurement The C1000 vastly simplifies measuring the mass matrix of heavy, odd shaped engines and powertrains. Foam for NVH solutions New innovations for a wide variety of sound-deadening applications. Long time coming: 2020 Corvette After six decades of teasing enthusiasts with intriguing concepts, Chevrolet is launching an all-new Corvette with its engine located where Zora intended-behind the driver. Protecting high-voltage circuits Yazaki readies a new solution for arc suppression in circuits of 48V or more. Editorial The unforgettable pyramid on the hood Supplier Eye Enter the

Study of the Sliding Door Shaking Problem and Optimization Based on the Application of Euler’s Spiral

10-02-03-001410/03/2018

This study focuses on the sudden shaking phenomenon of a sliding door passing through a corner. This phenomenon requires attention because shaking during movement can lead to a harsh operation feeling and a short service life. An experiment based on a test setup was conducted, and the sudden change in the acceleration of a sliding door panel was measured. Based on multi-body dynamics (MBD) analysis and a rigid-flexible coupled model of the sliding door system, the cause of the sudden shaking was determined to be the discontinuous curvature of the middle rail trajectory. A transition curve was proposed as the solution for the discontinuous curvature, and Euler’s spiral was applied in the redesign of the middle rail trajectory. Verified by simulations, the results exhibit considerable improvement in sliding door movement stability, with large reductions in the maximum center of mass (CM) acceleration and guide roller impact force.

Chen, Ziming, Li, Luoxing, Wu, Yunlong

Bringing the NVH Community Together: SAE 2015 Noise and Vibration Conference and Exhibition

1189405/17/2018

The SAE 2015 Noise and Vibration Conference and Exhibition is the premier technical event dedicated to mobility noise, vibration and harshness.

2021-12-29.TEST Delivering Maximal Robustness to Your Automotive ECU on a Frugal Budget *CSP Meta Testing*

04/03/2018

Automotive engineering has been a game of delivering more value with minimal resources confronting conflicting design choices at every design step. As more and more electronics enters the game, it becomes imperative to critically evaluate various design choices to deliver a robust hardware backbone which guarantees a robust performance on an ever-reducing budget. Hardware interface with the outside environment in particular needs to be equipped with a significant robustness. Harsh transients, tough environmental conditions, further complicate the rules to the game.

Vaidya, Vishwas

Simulation of Dynamic Gas Cavity Effects of a Tire under Operational Conditions

2018-01-068204/03/2018

The authors are responsible for the development of a structural 3D shell based bead-to-bead model with sidewalls and belt that separately models all functional layers of a modern tire [4]. In this model, the inflation pressure is modeled as a uniform stress acting normal to the shell’s inner face. The pressure can vary depending on the application: prescribed by the MBS-tool to align to a constant pressure specified for a vehicle or scenario, but it can also be modified dynamically to simulate e.g. a sudden pressure loss in a tire [1]. For many applications, this description of the inflation pressure as a time dependent quantity is sufficient. However, there are applications where it is needed to describe the inflation gas using a dynamic gas equation (Euler or Navier-Stokes). One such example is when the tire model is used in NVH (Noise-Vibration-Harshness) applications where the frequency range extends the 200 Hz range. For passenger car tires, a first mode of the inflation gas is at

Gallrein, Axel, Baecker, Manfred, Guan, Jianmin

SAE Eye on Engineering: Honda's Quiet New Odyssey

1228106/02/2017

One of the hardest-fought battles in developing a new vehicle is the battle against noise, vibration and harshness, or NVH. Honda attacked NVH on all fronts. In this episode of SAE Eye on Engineering, Editor-In-Chief Lindsay Brooke looks at Honda's 2018 Odyssey minivan. SAE Eye on Engineering also airs Monday mornings on WJR 760 AM Detroit's Paul W. Smith Show. Access archived episodes of SAE Eye on Engineering.

SAE International Journal of Vehicle Dynamics, Stability, and NVH

E-JOURNAL-1001/01/2017

Associate Editor Dr. Pranab Saha Awarded Medal of Honor Call for Papers: Special Issue on Vehicle Motion Controls: From Chassis Controls to Autonomous Vehicle Control -- Present Technologies and Future Vision Editor-in-Chief: Peijun Xu, Ph.D., Ebco, Inc., USA Indexed in CNKI ESCI (Emerging Sources Citation Index, Web of Science) Engineering Village (Ei Compendex) IET Inspec Scopus 2.1 2020CiteScore 55th percentile Powered by Author Resources Call for Papers Library Recommendation Form Published Volumes Subscription Options Aims and Scope The SAE International Journal of Vehicle Dynamics, Stability, and NVH is a scholarly publication of original research and review papers focusing on vehicle dynamics, stability, noise, vibration, and harshness (NVH). The Journal provides a peer-reviewed platform for researchers, engineers, and academicians to present their advanced theoretical and experimental work for developing quieter, more comfortable, and dynamically superior vehicles. Therefore

MEMS Oscillators with Improved Resilience for Harsh Automotive Environments

2016-01-010104/05/2016

Oscillators are key components in automotive electronics systems. For example, a typical automotive camera module may have three or more oscillators, providing the clocks for microcontrollers, Ethernet controllers, and video chipsets. These oscillators have historically been built around a quartz crystal resonator connected to an analog sustaining circuit driving the crystal to vibrate at its resonant frequency. However, quartz-based devices suffer from poor performance and reliability in harsh automotive environments. SiTime has developed timing solutions based on silicon micro-electromechanical systems (MEMS) technology that exhibit better electromagnetic noise rejection and better performance under shock and vibration. In this paper, we first discuss the design and manufacturing of the MEMS-based device, with emphasis on the specific design aspects that improve reliability and resilience in harsh automotive environments. These aspects include the SOI-based MEMS fabrication process

Arft, Carl, Lu, Yin-Chen, Parvereshi, Jehangir

Application of Laminated Composite Materials in Vehicle Design: Theories and Analyses of Composite Beams

2013-01-194305/13/2013

With rising fuel prices, lightweight structures and materials (like composites) are receiving more attention. Composite materials offer high stiffness to weight and strength to weight ratios when compared with traditional metallic materials. Traditionally, composite materials were generally costly which made them only attractive to very limited industries (e.g., the defense industry). Advances in their manufacturing and new innovations have brought the cost of these materials down and made them reasonably competitive. They have gained more and more usage in the last 3 decades in the aerospace industry and have recently been gaining more usage in the automotive industry. In automotive design, they yield lighter structures which have positive impact on attributes like fuel economy, emission and others. Proper modeling and analyses need to be performed to make sure that other attributes (e.g. durability, noise, vibration and harshness or NVH) are assessed properly and remain competitive

Qatu, Mohamad, Abu-Shams, Mohammad, Hajianmaleki, Mehdi

Application of Laminated Composite Materials in Vehicle Design: Theories and Analyses of Composite Shells

2013-01-198905/13/2013

With rising fuel prices, light weight structures and materials (like composites) are receiving more attention. Composite materials offer high stiffness to weight ratio when compared with traditional metallic materials. Traditionally, composite materials were generally costly which made them only attractive to very limited industries (e.g., the defense industry). Advances in their manufacturing and new innovations have brought the cost of these materials down and made them reasonably competitive. They have gained more and more usage in the last 3 decades in the aerospace industry and have recently been gaining more usage in the automotive industry. In automotive design, they yield lighter structures which have positive impact on attributes like fuel economy, emission and others. Proper modeling and analyses need to be performed to make sure that other attributes (e.g. noise, vibration and harshness or NVH) are assessed properly and remain competitive. Composite materials offered for

Qatu, Mohamad, Zannon, Mohammad, Mainuddin, Golam

LED Power Supplies

TBMG-1609503/01/2013

Green Watt Power (Concord, CA), a division of Calex Mfg. Co., has announced CSA/UL agency approvals on the Green Watt Power offering of LED Constant Current power supplies. The GLC Series offers solutions from 18 Watts to 150 Watts. All GLC models are enclosed to IP67 standards and well suited for virtually all LED lighting applications including indoor, outdoor, signage, and thermally harsh and damp environments. All models have a universal AC input and are agency approved to 277 VAC. Agency approvals include UL/CSA 8750 and 1310 class 2 or 1. All GLC models feature over voltage, over current, over temperature protection and are RoHS compliant. All models are designed and built for consistent performance and high reliability and come with a Five Year Warranty.

MEMS Deformable Mirrors Enable Imaging of Earth-Sized Extra-Solar Planets

TBMG-1448508/01/2012

The NASA-sponsored space exploration project, PICTURE (Planet Imaging Concept Testbed Using a Rocket Experiment), seeks to obtain a direct image of an extra-solar giant planet. The PICTURE telescope, which uses a BMC deformable mirror for adaptive optic wavefront control, was launched aboard a NASA sounding rocket in October 2011. Preliminary data show that the MEMS deformable mirror was successful in its operation.

SAE Clean Snowmobile Challenge Promo 2012

1105202/10/2012

SAE Clean Snowmobile Challenge Promo.2012. Shot this entirely at the Michigan Technological University Keweenaw Research Center in Winter 2011 (and a very small amount in 2009), at the annual Clean Snowmobile Challenge there, created by the SAE.

Sound Field Visualization using Spherical Holography

2010-01-142006/09/2010

Beamforming based on measurements with a spherical microphone array is a recognized technique for localization of noise sources. The method is very efficient for getting a quick overview of the positions of the most dominant sources. However, when more detailed information about the radiation from a source is needed, acoustical holography is normally more suitable, because it provides the actual acoustical quantities (pressure, velocity and/or intensity) at positions on or near the source surface, whereas beamforming only gives a directional map of contribution at the array position. Even though spherical arrays are most often used for beamforming they can also be applied for holography purposes. This means that with the same hardware beamforming can be used to identify a noise source, and then the array can be moved closer to the source to get a clearer picture of the radiation by using holography. Also, beamforming has a poor directional resolution at low frequencies, whereas

Gomes, Jesper, Haddad, Karim, Hald, Jorgen

Corrosion Evaluation of Army and Automotive Materials in the Hawaiian Islands – 3-Year Update

2008-01-115404/14/2008

The US Army operates in many harsh and demanding environments throughout the world, which are highly corrosive. However, there lacks a basic understanding of the severity of these environments and their impact on the Army's materiel. To better understand this impact and broaden their database of information, the Army has established test sites on the Hawaii islands. These sites represent various climatic conditions the Army operates in. In these locations panel exposure of Army and automotive systems have been made to compare performance with that documented in the continental US by the SAE ACAP and past Army programs. Recently the first set of samples exposed have completed three (3) years of exposure. A secondary set has reached its first year of exposure and a third set have completed three (3) months of exposure. This paper will present a summary of the three year results and future work to be completed.

Repp, John, Handsy, I. Carl

Corrosion Evaluation of Army and Automotive Materials in Hawaii

2006-01-164904/03/2006

The US Army operates in many harsh and demanding environments throughout the world, which are highly corrosive. However, there lacks a basic understanding of the severity of these environments and their impact on the Army's materiel. To better understand this impact and broaden their database of information, the Army has established test sites on the island of Oahu, Hawaii. These sites represent various climatic conditions the Army operates in. In select locations panel exposure of Army and automotive systems have been made to compare performance with that documented in the continental US by the SAE ACAP and past Army programs. This paper will present the details of this project and results through 1-year of exposure for this multi-year effort.

Repp, John, Sampson, Sheri, Handsy, I. Carl

Light-Emitting Diodes in Automotive Forward Lighting Applications: Materials Engineering Solutions to Fundamental Challenges

2004-01-022503/08/2004

Innovative LED lighting solutions have become more prevalent in automotive signal lighting during the past few years. However, to date, there has been no penetration into the various forward lighting applications. This is primarily due to significant materials engineering and optical design challenges that have made LEDs impractical or impossible to use in forward lighting applications where harsh environs and exacting beam pattern requirements exist. This paper will focus on these challenges, discuss recent progress in LED technology and, for the first time, demonstrate an LED source with comparable luminance to a filament bulb light source.

Flexible Multilayer Designs Provide Cost Effective Packaging Solutions

1999-01-016203/01/1999

This paper discusses a variety of manufacturing techniques which have been developed to produce cost effective multilayer interconnects while overcoming the harsh environmental conditions imposed by the Automotive Industry. A comparison is made to the transition of Military Rigid-flex technology and materials needed to overcome the aerospace environment.

DiPalermo, Joseph A.

Microelectronics-Microhybrid Technology

98C03910/19/1998

The development in electronics for automotive application shows a high speed of improvement over the last 20 years regarding downsizing of all components. This could be achieved despite the harsh environmental conditions we find in vehicles, especially in the engine compartment. Big changes have always required the development of new technologies regarding the production of electronic components. The paper shows technologies which are right now under development to allow the next steps regarding downsizing as well as some examples of possible applications. There is also information regarding the current obstacles for improvements beyond this point as well as basic ideas how to overcome some of them.

Kilgenstein, Peter

Comparisons of Thermocouple, Time-Averaged and Mass-Averaged Exhaust Gas Temperatures for a Spark-Ignited Engine

82005002/01/1982

Accurate knowledge of engine exhaust gas temperatures is important for engine design and diagnostic efforts. To survive the harsh exhaust gas environment, most practical devices for determining exhaust gas temperatures are relatively large. Because of their size, these devices do not provide instantaneous gas temperatures but provide a single equilibrium temperature. This investigation compared computed thermocouple equilibrium temperatures of the exhaust gas to computed time-averaged and mass-averaged gas temperatures for nine different engine conditions. Mass-averaged gas temperatures are directly related to the exhaust gas energy whereas thermocouple and time-averaged gas temperatures are not directly related. For most of the engine conditions of this study, the exhaust gas energy based on time-averaged gas temperatures was about 10% lower than the energy based on mass-averaged temperatures and the energy based on thermocouple temperatures depended on the thermocouple properties

PASSENGER CAR NOISE - ENGINE HARSHNESS

52002801/01/1952

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