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SAE International Journal of Vehicle Dynamics Stability and NVH
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Analysis of Exhaust System Mounting Scheme

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Automotive Engineering-Vishwas Shantaram Waghmare, Vaibhav Salunkhe, Rakesh Nagrani, Vishal Guttal
  • Journal Article
  • 2017-26-0291
Published 2017-01-10 by SAE International in United States
This paper presents a stepwise approach for exhaust system mount scheme finalization from concept to detail design phase. Finalization of exhaust hanger locations by finding Nodal points on exhaust system were considered. Various generic aspects like frequency separation, mode shapes, reaction forces, static displacement, and stress were considered. Apart from the generic aspects special aspects like peak loads and operating conditions were also considered. A combination of design of experiments (DoE) and optimization was used to finalize the mounting scheme and mounting characteristic parameters.
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Frontloading Approach for Sound Package Design for Noise Reduction and Weight Optimization Using Statistical Energy Analysis

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Mahindra & Mahindra, Ltd.-Vishal Vasantrao Chaudhari, V Radhika, R Vijay
  • Journal Article
  • 2017-26-0222
Published 2017-01-10 by SAE International in United States
First time right vehicle performance and time to market, remains all automotive OEMs top priority, to remain competitive. NVH performance of product communicates impression to customer, remains one of the most important and complex attribute to meet, considering performances to be met for 20 Hz -6000 Hz. Frontloading techniques (FEM/BEM/SEA/MBD) for NVH are critical and necessary to achieve first time right NVH performance.Objective of this paper is to present a frontloading approach for automotive sound package optimization (absorber, barrier and damper elements) for SUV vehicle. Current process of designing sound package is mainly based on experience, competitive benchmarking of predecessor products. This process (current process) heavily depend on testing and validation at physical prototype and happens at later stages of program, especially on tooled up body. This is because, structure borne noise development, sealing and leakage path treatment refinement assume priority over sound package development. This way of working has impacted on validation timelines, late changes in peripheral system, leading to cost increase and time delays. High frequency simulations (using statistical energy analysis) provides opportunity…
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Performance Cascading from Vehicle-Level NVH to Component or Sub-System Level Design

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Tata Motors, Ltd.-Milind Ambardekar, Nayankumar Solanki
  • Journal Article
  • 2017-26-0205
Published 2017-01-10 by SAE International in United States
Before a physical proto-vehicle is assembled, various components or subsystems are ready by Tier-I or II suppliers. During final design judgement of the vehicle thru’ CAE or Mule-vehicle testing, performance target compliance need be assured for all these components to meet the Vehicle-level NVH targets. The work here studies some of the major components of a passenger car. Their individual NVH response can be critical to be cascaded for meeting the final targets for the vehicles running over roads. Conclusions of the study challenge some of traditional beliefs or generic targets. Often the component level response deviating from its own targets may not have an adverse influence on NVH of the vehicle facing multiple excitations from tyre/road, wind and power-train in a frequency band of interest. It is the sound balance of In-cab as perceived by human occupants or overall Pass By Noise at 7.5 m from the vehicle will govern an optimal design of components or subsystems facing cost and weight constraints.
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On the Use of Driver-in-the-Loop (DIL) Systems in Commercial Vehicle Chassis Development

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Hyundai Motor Co.-Kwang Chan Ko
IDIADA Automotive Technology SA-Guido Tosolin
  • Journal Article
  • 2017-26-0242
Published 2017-01-10 by SAE International in United States
A vehicle simulation model is developed, validated and integrated into a closed-loop virtual driving environment using a state-of-the-art hexapod driving simulator. Thirty variant states are implemented and evaluated subjectively on steering and handling performance quality and quantity. Standard open-loop objective testing manoeuvres are simulated and performance metrics are calculated, allowing for a systematic cross-correlation process. Graphical analysis of the correlation metrics proves that chassis changes may accurately be felt through the simulator interface. It is proposed how obtained correlation models may serve for driver-feel optimizing target setting in early vehicle development stages, frontloading a great deal of costly prototype testing. System requirements are established and benefits and limitations are portrayed.
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Design and Analysis of a Plug-Muffler Modified for Low Back-Pressure and Improved Acoustic Performance

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Indian Institute of Science-M L Munjal, Vikas Kumar
  • Journal Article
  • 2017-26-0190
Published 2017-01-10 by SAE International in United States
High insertion loss is desirable and can be achieved by using plug-muffler elements which consist of two cross-flow perforated sections. However, the plug-mufflers have an inherent disadvantage of high back-pressure which may affect the engine performance adversely. In this paper, a novel structural modifications has been introduced to the plug-muffler to obtain better acoustic performance as well as low back-pressure. Three configurations have been analyzed here including the classical plug-muffler configuration. Back-pressure has been calculated using the lumped flow-resistance network theory for all three configurations and compared. To evaluate the transmission loss, the 1-D (plane wave) analysis has been carried out using the Integrated Transfer Matrix (ITM) method and the results so obtained are validated against 3-D FEM using a commercial software. For the 1-D ITM method as well as the 3-D FEM, an existing perforate impedance model has been used for evaluating and comparing the acoustic performance of the three configurations. Incidentally, however, a simplified expression for the acoustic impedance of the perforate has been developed, based primarily on the existing models for the…
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Generation of 3D-Digital Indian Public Road Profile Database and Its Application for Vehicle Development through Road-Vehicle Interaction Study

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Automotive Research Association of India-Prashant Pawar, Omkar Joshi, Mangesh Saraf
  • Journal Article
  • 2017-26-0275
Published 2017-01-10 by SAE International in United States
Design of vehicle for targeted customer usage is one of the key steps during vehicle development process. Due to globalization, most of vehicles, aggregates, components are being designed for global market considering worldwide load spectrum. Generally for doing this the vehicle response is being measured for different markets but this process is very time consuming. Also for getting these vehicle dependent parameters, exercises need to be repeated on each type/class of vehicle. So there is a need to have a robust procedure, tools which will helps OEM’s to predict the loads, vehicle response for different market segments at an early stage of vehicle development program using the inputs which are vehicle independent. The solution for this could be to use vehicle independent input such as digitized road profiles (2D or 3D) of target customer markets in combination with proper MBD simulation tools.This paper discuss about methodology used for generation of the 3D digital Indian road profile database and its applications in vehicle development. The paper elaborates on the methodology , process developed for measurement and…
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Investigation of the Behavior of Three-Wheel Vehicles When They Pass Over a Low μ Road Surface

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Yamaha Motor CO.,LTD-Keisuke Terada, Takayuki Sano, Kenichi Watanabe, Takashi Kaieda, Kazuhisa Takano
  • Journal Article
  • 2016-32-0051
Published 2016-11-08 by SAE International in United States
In recent years three-wheel camber vehicles, with two wheels in the front and a single rear wheel, have been growing in popularity. We call this kind of vehicle A “Leaning Multi Wheel category Vehicle” (hereinafter referred to as a “LMWV”). A LMWV has various characteristics, but one of them stands out in particular. When a LMWV is cornering, if one of the front wheels passes over a section of road surface with a low friction coefficient, there is very little disturbance to the vehicle’s behavior and can continue to be driven as normal. However, there has been no investigation into why these vehicles have this particular characteristic. Consequently, in this paper an investigation was carried out in order to determine the behavior of a LMWV in this situation. First, measurements were taken using an actual vehicle to confirm the situation described above. As a result, it was confirmed that there is only a small change in the vehicle’s posture and also that the other front tire generates tire force that appears to compensate for the…
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A Hybrid Development Process for NVH Optimization and Sound Engineering Considering the Future Pass-by Homologation Demands

SAE International Journal of Vehicle Dynamics, Stability, and NVH

AVL LIST GmbH-Bernhard J. Graf, Christian Hubmann, Markus Resch, Mehdi Mehrgou
  • Journal Article
  • 2016-32-0043
Published 2016-11-08 by SAE International in United States
Beside hard facts as performance, emissions and fuel consumption especially the brand specific attributes such as styling and sound are very emotional, unique selling prepositions. To develop these emotional characters, within the given boundary conditions of the future pass-by regulation, it is necessary to define them at the very beginning of the project and to follow a consequent development process. The following paper shows examples of motorcycle NVH development work on noise cleaning and sound engineering using a hybrid development process combining front loading, simulation and testing.One of the discussed solutions is the investigation of a piston pin offset in combination with a crankshaft offset for the reduction of friction. The optimization of piston slap noise as a result of the piston secondary motion was performed by simulation.As another example a simulation based development was performed for the exhaust system layout. A prerequisite for the optimization of the exhaust orifice sound was the definition and artificial generation of the target sound. The challenge for the target sound development was to comply with the future pass-by…
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Side View Assist - The World’s First Rider Assistance System for Two-Wheelers

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Bosch Corporation Japan-Ami Hirano
Robert Bosch GmbH-Michael Schoenherr, Mathieu Grelaud
  • Journal Article
  • 2016-32-0052
Published 2016-11-08 by SAE International in United States
The Side View Assist is the World’s first rider assistance system for two-wheelers. This is a Blind Spot Warning system, which uses four ultrasonic sensors to monitor the surrounding of the rider. Whenever there is a vehicle (i.e. a car, truck, or another motorbike) in the rider’s blind spot, the technology warns the rider with an optical signal close to the mirror. This will allow the rider to avoid a collision when changing lanes.In the current vehicle application, Side View Assist is active at speeds ranging from 25 to 80 kilometers per hour and supports riders whenever the difference in relative speed to other road users is small. The system helps to improve safety especially in cities, where heavy traffic makes it necessary to change lanes more often.Originally such systems have been developed for cars and different system solutions for cars have been in serial production for several years. The challenge was to adapt these systems so they would work for two-wheelers as well.Using the system components of car solutions is highly beneficial, because the…
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Development of Decentralized Integrated Chassis Control for Vehicle Stability in Limit Handling

SAE International Journal of Vehicle Dynamics, Stability, and NVH

University of Michigan - Ann Arbor-Sameer Kolte, Ananth Kumar Srinivasan, Akilla Srikrishna
  • Journal Article
  • 2016-01-8106
Published 2016-09-27 by SAE International in United States
As we move towards the world of autonomous vehicles it becomes increasingly important to integrate several chassis control systems to provide the desired vehicle stability without mutual interference. The principles for integration proposed in existing technical literature are majorly centralized which are not only computationally expensive but does not fit the current supplier based OEM business model. An Automotive OEM brings multiple suppliers on-board for developing the Active Safety systems considering several factors such as cost, quality, time, ease of business etc. When these systems are put together in the vehicle they may interfere with each other’s function. Decoupling their function results in a need of heavy calibration causing performance trade-offs and loss in development time. This puts forward a need for an algorithm which integrates individual control systems supplied by different vendors and enable them to function simultaneously to meet the vehicle dynamics performance criteria. To recreate the above scenario, individual control systems viz. Electronic Stability Control (ESC), Active Front Steer (AFS) and Active Suspensions have been developed and validated independent of each other…
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