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Automation of seatbelt reminder function test using hardware-in-the-loop simulator

MSX International-Cleber Albert Moreira Marques, Juliana Lima da Silva Lopes, Rafael Barreto Vieira
Ford Motor Company-Flavio Fabricio Ventura de Melo Ferreira, Genildo de Moura Vasconcelos
Published 2018-09-03 by SAE International in United States
This paper approaches the use of Hardware-in-the-Loop (HiL) test framework to perform automated verification test of Seatbelt Reminder Function in automotive Instrument Panel Cluster (IPC). The goal of this test was to verify if the Belt-Minder™ Feature performs its seatbelt warning function sounding a chime and illuminating a warning light when the user has his seatbelt unbuckled in compliance with safety standards and regulations. The manual execution of this test requires many resources like prototype vehicle, fuel, many engineers' work hours for each test, etc. However, testing dynamically with HiL system some of those mentioned resources are not required like the prototype vehicle and other are reduced, for example, the time taken to have report on hands. The most important among the advantages, was the possibility of testing with HiL earlier in the V-Diagram. The complexity of testing the IPC dynamically (automatic) was because this module provides most of the available and important information to the users about the overall status of the car. All information traffic comes to IPC by hardwired or CAN (Controller…
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The Implementation of Time Selective Technique for Simulated Free-Field Measurements to Loudspeaker Characterization

MSX International-Leonardo Faria
Ford Motor Company Brasil Ltda-Fabio G. Ferraz, Marco Castro, Valdinei Sczibor, Juliano Medeiros
Published 2010-10-17 by SAE International in United States
The use of time selective techniques has been used for years in signal processing for acoustic, vibration and electro-acoustic to make simulated free-field measurements. Many acoustic solutions have been implemented and developed by specialized software companies and are offered to final users by the costs of large amounts of money. However, recent advances in hardware, software and data acquisition systems - allied to a good background in signal processing - has enabled the implementation of fast and practical solutions to more complex problems involving direct signal manipulations, analysis and post-processing. This work presents the home implementation of a test-bench solution used for loudspeaker quality evaluation that uses time selective techniques enabling measurement of free field response of loudspeakers to be performed without the need of an anechoic chamber, allowing the conduction of the measurement in a low cost test bench, inside an ordinary quiet room, without spent large facility investments. A case study is also presented showing the effectiveness and versatility of the implemented test bench.
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Implementation of a test-bench solution for loudspeaker quality characterization

MSX International-Leonardo Faria
AVAPE-Aleandro Oliveira
Published 2010-10-06 by SAE International in United States
Vehicle audio system performance is an important attribute for final customers. Usually the system performance is evaluated by subjective judgments and also some sort of objective measurements, as for example: reverberation time measurement of the internal cabin, frequency response and harmonic distortion. But all of these measurements are performed by the automaker at vehicle level - with audio system and speakers installed inside the vehicle cabin - for general quality inspections and definition of some spatial parameters of internal trim design. Loudspeaker performance evaluation usually requires great amount of investments due to the acoustic chamber requirements. This work presents the home implementation of a test-bench solution used for loudspeaker quality evaluation that uses time selective techniques enabling measurement of free field response of loudspeakers to be performed without the need of an anechoic chamber, allowing the conduction of the measurement in a low cost test-bench, inside an ordinary quiet room, without spent large facility investments.
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Balancer Shaft Development for an In-line 4-Cylinder High Speed Diesel Engine

MSX International-Alexandre Augusto Riginik Ferreira
MWM International Motores-Frederico Barbieri, Celso Argachoy
Published 2008-10-07 by SAE International in United States
Internal combustion engine noise and vibration are major issues for car makers, and these are even more important for High-Level Pick-ups and SUV's which applies modern diesel engines. One important player in this scenario is the second-order unbalanced forces vibration produced by the conventional in-line 4-cylinder engine configurations, which leads to high-frequency excitation of vehicle's structure and consequent internal noise.This paper studies a balancer shaft solution for the mentioned engine configuration, as well as major design alternatives and development process and issues. This paper also presents an example of a balancer shaft design and development for a high speed diesel engine, as well as proposes a design/decision matrix methodology. Such methodology, which can be applied to any design or engineering case, helps design engineers make the right decision amongst different options by using a very simple and objective matrix.
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Interpretation of Time-Frequency Distribution Cross Terms

MSX International-Aaron M. Lock
Chrysler LLC-Steven R. Sorenson
Published 2008-04-14 by SAE International in United States
Noise and vibration signals which are stationary are frequently analyzed for frequency content using Fourier Transform methods. Frequency content can be clearly displayed, but temporal characteristics of signals can easily be obscured in a frequency spectrum. Several commonly available methods of analyzing nonstationary signals are available, such as short-time Fourier Transform and wavelet analysis. Smearing of data in the time and/or frequency domains leads to limited usefulness of these methods in analyzing rapidly varying signals. This also applies to stationary signals with perceivable temporal characteristics.The Wigner Distribution is a time-frequency analysis which can analyze rapidly varying signals and show the effects of rapid changes in signal characteristics. It is appealing because it fully preserves all the information present in the original signal. However, the Wigner Distribution of a measured signal typically contains cross terms which do not correspond to spectral components in the original signal. Much success has been achieved at reducing cross terms by modifying the Wigner Distribution (at the expense of losing some of the original signal information). The objective of this paper…
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Optimizing 4×4 Steering Geometry

MSX International-Romeu Fontana
Ford Motor Company-Renato Slave, Fernando Andrade
Published 2007-01-28 by SAE International in United States
This paper is related to a new concept for the steering linkage of light trucks featuring mono-beam front axles. The current configuration of steering systems for those vehicles comprise a worm and sector steering with a Pitman arm connected to a transverse drag link. This last one connects to the steering link that finally steers the left and right wheels.The problem that has been experienced with this system is that, during a braking event, results in a very unfavorable bump steering condition.
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Body/Chassis Dynamic Response Under Experimental Modal Test

MSX International-Robert M. Shaver
DaimlerChrysler Corporation-Kuang-Jen J. Liu
Published 2005-05-16 by SAE International in United States
Mode management is an essential part of the design process for NVH performance. System resonances must be sufficiently separated to minimize interaction from source inputs and each other [1]. Such resonances are typically determined through experimental modal testing conducted in a lab environment under controlled and repeatable conditions. Global vehicle and suspension system response demonstrate soft nonlinear behavior, however. Their resonant frequencies may thus decrease under on-road input not reproducible in a lab environment. Subsequently, mode management charts derived from lab testing may not be representative of the vehicle's on-road dynamic response. This paper presents modal model determination methodologies, and examines suspension system and vehicle global dynamic response under lab modal test and operating conditions. Vehicle suspension modes measured under static and dynamic (rolling) conditions will be compared. Additionally, vehicle global modes determined utilizing lab shaker input will be compared with modes measured on-road.
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CAE Approach for Light Truck Frame Durability Evaluation Due to Payload Increase

MSX International-Ivan Lima
CAETECH Engenharia Ltda-Geraldo Minoru Kato
Published 2004-11-16 by SAE International in United States
The growing competition of the automotive market makes more and more necessary the reduction of development time and consequently, the increase of the capacity to quickly respond to the launching of the competitors. One of the most costly phases on the vehicle development process is the field durability test, both in function of the number of prototypes employed and the time needed to its execution.More and more diffused, the fatigue life prediction methods have played an important part in the durability analysis via CAE. Nevertheless, in order they can be reliable and really being able to reduce the development time and cost, they need to be provided with load cases that can accurately represent the field durability tests.This work presents a CAE approach used for light trucks in order to get a reasonable understanding of component durability behavior due to payload increase. In general, road load data is not available for a new payload condition. In this approach, data calculated via virtual MBS prototype submitted under representative static load case is used instead road load…
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The Interactive NVH Simulator as a Practical Engineering Tool

MSX International-Mark Allman-Ward, Joe Venor, Roger Williams
Jaguar Cars Ltd.-Martin Cockrill
Published 2003-05-05 by SAE International in United States
Experiencing the results of virtual NVH analysis in an immersive physical simulation is the only accurate method of developing vehicle, system or component targets and designs. This paper describes an engineering approach specifically created to enable physical interaction with test, CAE and hybrid NVH models, at every stage in the vehicle design process from concept to full detail. It explains the need for sound and vibration decomposition and synthesis, and interactive sound and vibration replay. Implementation of this process has led to the development of engineering tools that enable Interactive NVH Simulation. The paper also describes the practical use an engineer can make of a ‘rapid prototyping’ desktop NVH simulator in the design process. A full scale NVH Simulator is then used to allow evaluation of final design alternatives under realistic driving conditions by non-specialists (i.e. the customer) as well as specialists.
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Accurate Modeling for the Powertrain and Subframe Modes

MSX International-Mohammad Sirafi
Ford Motor Co.-Mohamad Qatu
Published 2003-05-05 by SAE International in United States
Powertrain mounts are one of the important design characteristics of a vehicle. Powertrain is mostly mounted to the front subframe and once installed in a vehicle, powertrain mounting has an important role in determining the vehicle vibration characteristics. A good mounting system isolates engine input vibration from the vehicle body and minimizes the effect of road inputs to the customer. This paper discusses results of several dynamic models as they relate to noise, vibration and harshness (NVH) and compares the accuracy of these models. Various powertrain models are studied and their accuracy in comparison with full a vehicle model is discussed.
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