Three-Dimensional Operational Deflection Shape Analysis of Squealing Disc Brakes

2004-01-2796

10/10/2004

Event
22nd Annual Brake Colloquium & Exhibition
Authors Abstract
Content
In the development of noiseless brakes, investigation of actual vibration and knowledge of the operational deflection shape (ODS) is necessary in order to work out countermeasures methodically. Whereas great progress has been achieved in computer-aided simulation of brake noise, the measurement of the ODS is still problematic. The optical techniques usually employed for identifying the ODS have limitations in measuring all three spatial dimensions and are restricted to visible areas which must not be shaded or hidden inside.
This paper presents an alternative method for measuring the ODS which uses miniature accelerometers placed in the cooling ducts of the disc and rotating with it. Together with a special evaluation procedure, this permits three-dimensional investigation and definite identification of both out-of-plane and in-plane vibration. Especially important is the part of the ODS in the region of the contact disc/pad, which was as yet inaccessible to other techniques. In addition, the method results in a number of other findings which are also discussed (e.g. detection of traveling/stationary waves, quantification of amplitude and frequency fluctuations per revolution). Along with presenting the method based on selected examples, the potentials and problems are discussed and the future prospect of the method is appraised.
Meta TagsDetails
DOI
https://doi.org/10.4271/2004-01-2796
Pages
8
Citation
Marschner, H., and Rischbieter, F., "Three-Dimensional Operational Deflection Shape Analysis of Squealing Disc Brakes," SAE Technical Paper 2004-01-2796, 2004, https://doi.org/10.4271/2004-01-2796.
Additional Details
Publisher
Published
Oct 10, 2004
Product Code
2004-01-2796
Content Type
Technical Paper
Language
English