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A Predictive Tool to Evaluate Braking System Performance Using Thermo-Structural Finite Element Model

SAE International Journal of Passenger Cars - Mechanical Systems

Universiti Teknologi Malaysia, Malaysia-Wan Zaidi Wan Omar
University of Sciences and Technology of Oran, Algeria-Ali Belhocine
  • Journal Article
  • 06-12-03-0014
Published 2019-10-14 by SAE International in United States
The braking phenomenon is an aspect of vehicle stopping performance where with kinetic energy due to the speed of the vehicle is transformed into thermal energy produced by the brake disc and its pads. The heat must then be dissipated into the surrounding structure and into the airflow around the brake system. The thermal friction field during the braking phase between the disc and the brake pads can lead to excessive temperatures. In our work, we presented numerical modeling using ANSYS software adapted in the finite element method (FEM), to follow the evolution of the global temperatures for the two types of brake discs, full and ventilated disc during braking scenario. Also, numerical simulation of the transient thermal analysis and the static structural analysis were performed here sequentially, with coupled thermo-structural method. Numerical procedure of calculation relies on important steps such that Computational Fluid Dynamics (CFD) and thermal analysis have been well illustrated in three-dimensional form (3D), showing the effects of heat distribution over the brake disc. This CFD analysis helped us in the calculation…
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Comparison Study of Malaysian Driver Seating Position in SAEJ1517 Accommodation Model

SAE International Journal of Passenger Cars - Mechanical Systems

Universiti Teknologi Malaysia, Malaysia-Nooh Abu Bakar
Universiti Teknologi Malaysia, Malaysia Massachusetts Institute of Technology, USA-Rozzeta Dolah
  • 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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Brake Squeal: Complex Eigenvalue versus Dynamic Transient Analysis

Universiti Teknologi Malaysia, Malaysia-A. R. AbuBakar, A. Sharif, M. Z. A. Rashid
University of Liverpool, UK-H. Ouyang
Published 2007-10-07 by SAE International in United States
Brake squeal from either disc brakes or drum brakes has been one of the major concerns in the automotive industry due to the persistent complaint that reduces customers' satisfaction with their vehicle. In order to understand, predict and prevent brake squeal, experimental and numerical approaches have been used. Whilst the experimental approach is expensive due to hardware costs and long turnaround time, the numerical approach seems to offer many advantages over experimental approach. In predicting brake squeal using numerical approach, there are typically two methods available, namely, complex eigenvalue analysis and dynamic transient analysis. In this paper both methods are applied on a drum brake assembly using a single commercial finite element software package, ABAQUS. Predicted results from both analyses will then be compared and discussed. Drum brake squeal analysis is also simulated on two different friction characteristics i.e., constant friction coefficient and negative μ-v slope. From the predicted results, it is found that the dynamic transient analysis can capture quite well most of the unstable frequencies generated in the complex eigenvalue analysis.
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