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Title:

Visualizing Brake Squeal and Its Out-of-Plane Modes Using HELS

Accession Number:

01053871

Record Type:

Component

Availability:

Institute of Noise Control Engineering

Iowa State University, 210 Marston Hall
Ames, IA 50011-2153 United States

Abstract:

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.

Monograph Accession #:

01054353

Language:

English

Corporate Authors:

Institute of Noise Control Engineering

Iowa State University, 210 Marston Hall
Ames, IA 50011-2153 United States

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Moondra, Manmohan S
Wu, Sean F
Beniwal, Ravinder
Mazza, Sergio
Chen, Frank
Chen, Shih-Emn

Editors:

Burroughs, Courtney B
Maling, George C

Pagination:

pp 98-102

Publication Date:

2004

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
Sponsors: Institute of Noise Control Engineering; Transportation Research Board

Media Type:

CD-ROM

Features:

Figures; Photos; References (17)

Subject Areas:

Energy; Environment; Highways; Vehicles and Equipment; I15: Environment

Files:

TRIS, TRB

Created Date:

Jul 13 2007 12:30PM