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Accounting the variabilities into squeak and rattle predictions

Altair Engineering India Pvt Ltd-Chandan Ravi, Rongali Praveen
Altair Engineering India Pvt , Ltd.-Hari Krishna Reddy
  • Technical Paper
  • 2019-28-2402
To be published on 2019-11-21 by SAE International in United States
Squeak and Rattle (S&R) are the dominant undesired noises which adjudge the perceived quality of a vehicle. It's a foremost problem which needs to be identified and eliminated at a design stage to develop a robust vehicle, which also aids in pacifying the physical testing and warranty claim costs. A Finite Element model of the complex plastic dashboard has been analyzed to identify risks and the root cause of S&R problem under dynamic and static loading conditions, using E-line methodology. These complex transient problems are highly influenced by various parameters like gap variability, temperature, the coefficient of thermal expansion, thickness, and material properties. This paper elaborates the detailed investigation conducted using stochastic simulations to evaluate the individual and combined impact of each parameter on S&R performance

A Resonant Capacitive Coupling WPT-Based Method to Power and Monitor Seat Belt Buckle Switch Status in Removable and Interchangeable Seats

Ford Motor Co.-Mark Cuddihy
Solace Power Inc.-Brian Pottle
Published 2019-04-02 by SAE International in United States
In this study, we present an intelligent and wireless subsystem for powering and communicating with three sets of seat belt buckle sensors that are each installed on removable and interchangeable automobile seating. As automobile intelligence systems advance, a logical step is for the driver’s dashboard to display seat belt buckle indicators for rear seating in addition to the front seating. The problem encountered is that removable and interchangeable automobile seating outfitted with wired power and data links are inherently less reliable than rigidly fixed seating, as there is a risk of damage to the detachable power and data connectors throughout end-user seating removal/re-installation cycles. The present study tackles this issue through outfitting three removable and interchangeable rear seat assemblies with resonant capacitive coupling wireless power transfer as to power each rear seat across a variable gap between the interior paneling and that side of the seat closest to the interior paneling. A fundamental design challenge this system presented was the need to develop a rugged method to account for different sizes of seating, and hence…
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A Closed Loop Method for Vehicle Instrument Cluster Test Automation

General Motors LLC-Gayatri Sindhu G, Arunkumar Ramu, Raghuram Shastry
Published 2019-04-02 by SAE International in United States
Instrument Panel Cluster (IPC), is a key ECU in vehicles. As IPC is a visual product, testing the software features of IPC is highly manual effort. Software Testing constitutes for approx. 35% of the total Software Development Life Cycle (SDLC). High focus on quick to market, shorter SDLC coupled with manual validation environment poses a challenge of increasing testing efficiency and improving software quality. This challenge drove the need to investigate a solution to automate the testing process and cut down the huge manual effort that goes into validating an Instrument Panel Cluster (IPC) software. The proposed intrusive and non-intrusive approaches to automate the testing process of IPC software employs a Frame Grabbing technique for the former approach and a Camera based technique for the latter. Both the approaches are robust, reliable, and scalable and covers the major portion of Vehicle Instrument cluster test scenarios. The paper captures the results, advantages and the constraints in the implementation of both the approaches. The comprehensive evaluation of the proposed techniques will help in identifying the right approach…
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Coating, Reflection-Reducing for Instrument Glasses

AMS B Finishes Processes and Fluids Committee
  • Aerospace Material Specification
  • AMS2521D
  • Current
Published 2019-02-11 by SAE International in United States
This specification covers optical-quality coatings applied to instrument glasses.
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Video-Recorded “Looked-but-Failed-to-See” (LBFTS) Accidents in the Junctions of Hong Kong

Hong Kong Government Laboratory-Yuk Ki Cheng, Cheok Ning Tam, Chi Hang Tao, Cheuk Nam Tsang
Published 2019-01-18 by SAE International in United States
To determine causation and contributory factors of “looked-but-failed-to-see” (LBFTS) junction accidents in which the driver stated that “I did not see the pedestrian,” in-depth studies of 22 such accidents which had taken place in Hong Kong were conducted. The studied crashes were all video recorded by closed-circuit television (CCTV) cameras and/or dashboard cameras. Using the video recordings, these junction accidents were reconstructed at the scenes to determine the drivers’ views of the pedestrians and the sequence of events leading up to each accident. The results of the reconstructions and the police investigations, as well as the testimony of the drivers, were analyzed to identify causation and contributing factors of each accident. Attention error/visual search strategy (41%) and misjudgments of drivers (18%) remain the dominant cause of LBFTS crashes. However, it was found that eight crashes (36%) were attributed to the physical obstructions caused by the A-pillars of the vehicles, with the obscuration of the pedestrians being the major contributory factor. This study shows that reconstructions based on video recordings can provide detailed accounts of junction…
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CAE Based Head Form Impact Simulations for Development of Vehicle Interiors

Tata Motors, Ltd.-Kedar Joshi, Vilas Jadhav
Tata Technologies, Ltd.-Yuvraj Suryawanshi, Sachin Lambate
Published 2019-01-09 by SAE International in United States
The interior components of a passenger vehicle are designed to provide comfort and safety to its occupants. In the event of accident, vehicle interiors are primary source of injuries when occupants interact with them. Vehicle interiors consists of Instrument panel (IP), center console, seats and controls in front of seating position etc. Severity of the injuries depends on the energy dissipating characteristics, profiles, projections of different interior components. These are assessed by ECE R21 and IS12553 head form impact tests. To evaluate the Head form impact performance on Interior components, Computer Aided Engineering (CAE) simulations are extensively used during the vehicle development. In order to predict failure of plastic components and snap joints which might lead to expose sharp edges, it is critical to model plastic material and snap joint. Vehicle interiors are certified for head form impact requirements based on physical testing where dashboard samples from productions tools are used. At this stage of development, if any failure occurs then changes in interior design becomes very expensive and time consuming. To avoid this situation,…
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Standard - Optical System HUD for Automotive

Vehicular Flat Panel Display Standards Committee
  • Ground Vehicle Standard
  • J1757-2_201811
  • Current
Published 2018-11-06 by SAE International in United States
This SAE Standard provides measurement methods to determine HUD optical performance in typical automotive ambient lighting conditions. It covers indoor measurements with simulated outdoor lighting for the measurement of HUD virtual images. HUD types addressed by this standard includes w-HUD (windshield HUD) and c-HUD (combiner HUD) with references to Augmented Reality (AR) HUD as needed. It is not the scope of this document to set threshold values for automotive compliance; however, some recommended values are presented for reference.
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Crew Station Lighting - Commercial Aircraft

A-20A Crew Station Lighting
  • Aerospace Standard
  • ARP1161A
  • Current
Published 2018-10-10 by SAE International in United States
This SAE Aerospace Recommended Practice covers the recommended requirements for the lighting and characteristics of instruments; information plates and displays, emergency, cautionary, advisory and status displays; circuit breaker and toggle switch positions; and the recommended requirements for the utility lighting system.
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Automation of seatbelt reminder function test using hardware-in-the-loop simulator

Ford Motor Company-Flavio Fabricio Ventura de Melo Ferreira, Genildo de Moura Vasconcelos
MSX International-Cleber Albert Moreira Marques, Juliana Lima da Silva Lopes, Rafael Barreto Vieira
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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Localization of BSR Noise Source Using the Improved 3D Intensity Method

Korea Advanced Institute of Science & Technology-In-Jee Jung
Published 2018-06-13 by SAE International in United States
A three-dimensional (3D) sound intensity probe is used to identify the trim components generating buzz, squeak, and rattle (BSR) noise in a vehicle interior. The 3D intensity probe has the advantages of compact overall size, small number of microphones, and low-frequency detection capability. Although the 3D sound intensimetry has been not popularly applied in practical problems due to various bias errors, a new error compensation method is adopted in this work, substantially improving the estimate’s precision. Linearization of the phase function of the cross-spectral density function between a set of two microphones is used to calculate the intensity avoiding spectral bias error, and an error map for spatial angles is used to compensate for the difference in directivity index around the microphone array. An intensity probe with an even microphone spacing of 30 mm in tetrahedral arrangement is used for the source localization. The interior space is usually a nearly dead room in terms of absorption, but the reverberation effect cannot be neglected due to the small space. Experiments are conducted by using the artificially…
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