Visualizing Brake Squeal and Its Out-of-Plane Modes Using HELS
This paper describes how brake squeal has always been a top customer satisfaction and quality control issue for the auto industry because of its extremely unpleasant, high-pitch/high-intensity sound. Over the past decade, hundreds of millions of dollars have been spent on vehicle repairs because of brake squeals. The analysis of brake squeal is extremely difficult because of its unpredictability and irregularity. Even under well-controlled laboratory conditions, brake squeal may not be reproducible and when it does, squeal lasts for a fraction of a second. Currently, analysis of brake squeal is carried out using a scanning laser to measure the out-of-plane and in-plane vibration modes, and operational deflection shape during squeal. In laser diagnostics, it is critical to synchronize scanning with an onset of brake squeal so as to correctly identify the vibration modes. Since brake squeal is unpredictable, it occurs in a twinkling of an eye, and it cannot be repeated for more than a few minutes, a complete scanning over the entire disk brake assembly surface normally can be very time consuming. Apparently, such an approach is not in keeping with the demand on cost-effective NVH diagnostics and abatement.
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Corporate Authors:
Institute of Noise Control Engineering
Iowa State University, 210 Marston Hall
Ames, IA United States 50011-2153 500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- Moondra, Manmohan S
- Wu, Sean F
- Beniwal, Ravinder
- Mazza, Sergio
- Chen, Frank
- Chen, Shih-Emn
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Conference:
- Noise-Con 04. The 2004 National Conference on Noise Control Engineering
- Location: Baltimore Maryland, United States
- Date: 2004-7-12 to 2004-7-14
- Publication Date: 2004
Language
- English
Media Info
- Media Type: CD-ROM
- Features: Figures; Photos; References;
- Pagination: pp 98-102
- Monograph Title: Noise-Con 04. The 2004 National Conference on Noise Control Engineering
Subject/Index Terms
- TRT Terms: Brake discs; Brakes; Braking performance; Diagnostic tests; Noise; Noise control; Noise sources; Quality control; Traffic noise; Vibration
- Subject Areas: Energy; Environment; Highways; Vehicles and Equipment; I15: Environment;
Filing Info
- Accession Number: 01053871
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Jul 20 2007 9:56AM