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Towards a Quiet Vehicle Cabin Through Digitalization of HVAC Systems and Subsystems Aeroacoustics Testing and Design

Dassault Systèmes SIMULIA-Vincent Vidal, Adrien Mann, Jonas Verriere, Minsuk Kim
Valeo Thermal Systems-Fabrice Ailloud, Manuel Henner, Olivier Cheriaux
Published 2019-06-05 by SAE International in United States
With the rise of electric autonomous vehicles, it has become clear that the cabin of tomorrow will drastically evolve to both improve ride experience and reduce energy consumption. In addition, autonomy will change the transportation paradigm, leading to a reinvention of the cabin seating layout which will offer the opportunity to climate systems team to design quiet and even more energy efficient systems.Consequently, Heat and Ventilation Air Conditioning (HVAC) systems designers have to deliver products which perform acoustically better than before, but often with less development time. To success under such constraints, designers need access to methods providing both assessment of the system (or subsystems) acoustic performance, and identification of where the designs need to be improved to reduce noise levels. Such methods are often needed before a physical prototype is requested, and thus can only be achieved in a timely manner through digital testing. Previous studies have demonstrated the ability of a CFD/CAA approach based on the Lattice Boltzmann Method (LBM) to predict HVAC system noise including real and complex ducts, registers, mixing unit…
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Analyzing Field Environments to Understand Product Failure Causes

Vibration Research-Jade Vande Kamp
Published 2019-06-05 by SAE International in United States
Product failures often require expensive repairs or replacements. Over-engineering adds to recurring costs and its success is uncertain if the failure’s cause is not understood. Engineers need in-depth knowledge before attempting a re-design. This case study focuses on bus seat failures that occasionally occur in the field but are not predicted by current industry standard tests in the lab. The goal was to collect comprehensive field vibration data and analyze that data to understand the failure’s causes. The study used accelerometers placed at various points in multiple seating configurations and across multiple field environments. Analysis identified transmissibility issues between axes of motion, as well as a seat configuration with higher reliability.
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Comparison of Measurement Methods for Evaluating Displacement of Commercial Vehicle Seats

CVG-James Haylett
University of Washington-Peter Johnson
Published 2019-06-05 by SAE International in United States
Measuring the displacements in vehicle seat suspensions and the displacements the seat has to absorb may assist vehicle seat designers in better designing seats to absorb vibrations. Low frequency seat displacement is important in seat design to identify end-stop events and higher frequency shorter displacements are also important since seat components can be optimized to absorb these smaller displacements. Displacements can be directly measured with special instruments, but it would be less complicated if simple, compact accelerometers could be used to measure the seat displacements. This paper compares accelerometer-derived displacement measurements to known displacements derived from sinusoidal physics and field measured random displacements measured with potentiometers. Using known, controlled sinusoidal displacements, three lab-based experiments were conducted to determine how well accelerometers, using double integration, could measure displacements. In addition, using a vehicle travelling on four different road types, the capability of accelerometers measuring random displacement was assessed. In general, the accelerometer-derived displacements matched the known sinusoidal displacement in the lab settings and the potentiometer measured displacements in the field; however, limitations were identified. First, the…
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Protecting high-voltage circuits

Automotive Engineering: June 2019

Lindsay Brooke
  • Magazine Article
  • 19AUTP06_07
Published 2019-06-01 by SAE International in United States

Yazaki readies a new solution for arc suppression in circuits of 48V or more.

As OEMs develop their next-generation electrical architectures aimed at new hybrid, EV and autonomous vehicles, engineers are focused on delivering systems that are even more robust and “fail-safe” than those used today. Handling more power safely is a given, experts say, as more power-gobbling heated seats, electric turbos, active suspensions, lidars, on-board data processors and other safety sensors are added.

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H-Point Machine (HPM-II) - Procedure for H-Point Determination - Benchmarking Vehicle Seats

Human Accom and Design Devices Stds Comm
  • Ground Vehicle Standard
  • J4003_201904
  • Current
Published 2019-04-25 by SAE International in United States

Benchmarking is used to discover the design intent measurements for seating compartments in vehicles when these measurements are either unknown or are specified using differing measurement procedures.

 

Comparison Study of Malaysian Driver Seating Position in SAEJ1517 Accommodation Model

SAE International Journal of Passenger Cars - Mechanical Systems

PROTON Shah Alam, Malaysia-Zuli’zam Rashid
Universiti Teknologi Malaysia, Malaysia-Nooh Abu Bakar
  • Journal Article
  • 06-12-02-0006
Published 2019-04-08 by SAE International in United States
A key element in an ergonomically designed driver’s seat in a car is the correct identification of driver seating position and posture accommodation. Current practice by the automotive Original Equipment Manufacturer (OEM) is to utilize the Society of Automotive Engineering (SAE) J1517 standard practice as a reference. However, it was found that utilizing such guidelines, which were developed based on the American population, did not fit well with the anthropometry and stature of the Malaysian population. This research seeks to address this issue by comparing the SAE J1517 Model against Malaysian preferred driving position. A total of 62 respondents were involved for the driver seating position and accommodation study in the vehicle driver’s seat buck mockup survey and measurements. The results have shown that the Malaysian drivers prefer to sit forward as compared to the SAE J1517 Model and have shorter posture joint angle. This could significantly affect the design of the driver seat positions and layout of other driving elements, suggesting a need to reconsider its application, in particular for the Malaysian population.
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A Study on Control Logic Design for Power Seat

Hyundai Motor Co.-Misun Kwon, Taehoon Lee, Sangdo Park
Published 2019-04-02 by SAE International in United States
The large luxury sedan seat has a 22-way Movement. It offers a wide range of adjustments to enhance passenger comfort performance while it has many constraints on movement in constrained indoor space. In addition, the power seat is operated by a motor, which makes it difficult for the user to determine the amount of adjustment, unlike determining the amount of adjustment by the power and feel of a person, such as manual seat adjustment. IMS, one-touch mode, is also constrained by parameters such as indoor space package, user's lifestyle, etc. during function playback. This paper aims to design the seat control logic to achieve the best seat comfort while satisfying each constraint.The results of this study are as follows. Increase robustness of power seat control logic.Provide optimal adjustments and comfort at each location.Offer differentiated custom control and seating modes for each seat.Improve customer satisfaction and quality by upgrading software.
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Vibration Control of an Active Seat Suspension System Integrated Pregnant Woman Body Model

6 th of October Univ. and Helwan University-AM Abdel-Ghany
Helwan University-H. Metered, A. M Bassiuny
Published 2019-04-02 by SAE International in United States
Proportional-integral-derivative (PID) controller is effective, popular and cost effective for a lot of scientific and engineering applications. In this paper, PID and fuzzy-self-tuning PID (FSTPID) controllers are applied to improve the performance of an active seat suspension system to enhance the pregnant woman comfort. The equations of motion of thirteen-degrees-of-freedom (13-DOF) active seat suspension system incorporating pregnant woman body model are derived and simulated. PID gains are tuned and estimated using genetic algorithm (GA) to formulate GA PID controller. In FSTPID, fuzzy logic technique is used to tune PID controller gains by selecting appropriate fuzzy rules using Matlab/Simulink software. Both controlled active seat suspension systems are compared with a passive seat suspension. Suspension performance is evaluated under bump and random road excitations in order to verify the success of the proposed controllers. Theoretical results reveal that the proposed controllers using GA PID and FSTPID grant a significant enhancement of the pregnant woman comfort and her fetus.
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Use of CAE Tool to Evaluate the Body Pressure Distribution Plot on Automotive Seating

Woodbridge Group-DM N. Alam, Vaidehi Chennubhotla
Published 2019-04-02 by SAE International in United States
Body Pressure Distribution (BPD) plot plays a vital role during designing the seating system. The seating system provides support and comfort to the occupants while they are operating the vehicle. The traditional way to produce Body Pressure Distribution (BPD) plot for a seating system is to use actual human subject with pressure sensor mat. But this is only possible when the seat has been manufactured. The purpose of this paper is to demonstrate the capability of CAE analytical tool to find the BPD plot at the early phase of the seating system design. Computer-aided engineering (CAE) uses many different computer software to aid engineering analysis tasks by using finite element analysis (FEA) which is a numerical method for solving problems of engineering and mathematical physics. BPD plot created by using SAE standard manikin is not very realistic as that dummy back and butt is not deformable compared to human manikin dummy. Human manikin back and butt is made of deformable finite element tissue which gives more realistic direction of body pressure distribution. With the help…
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FRED II Quasistatic Seat Testing Rearward: An Improved Method Based on the SAE H-point Manikin

Collision Research & Analysis Inc.-Samuel White
Ford Motor Company-Roger Burnett
Published 2019-04-02 by SAE International in United States
Various methods have been used to load a seat in the rear direction, including FMVSS 207, assorted body blocks and QST (quasistatic seat test). However, each method lacks some critical aspect of occupant loading of the seat or is too complex for routine development work. A new method is presented to determine the strength and energy transfer of a seat to an occupant in rear impacts that reflects how an occupant interacts with the seat in a rear impact. A metal-cast H-point manikin, called FRED II, was modified to support a loading bar and was pulled rearward into the seatback by a hydraulic ram. The force and displacement of the loading and the inboard and outboard seatback angle were measured. The response of the seat was recorded by video. The moment about the recliner pivot at peak force was determined by aligning the center of the recliner in side views of the seat position initially and at peak load. The height of the cable above the center of the recliner was determined giving the moment…
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