DYNAMIC STUDY OF A SIMPLIFIED MECHANICAL SYSTEM WITH PRESENCE OF DRY FRICTION

✍ Scribed by A. TOUFINE; J.J. BARRAU; M. BERTHILLIER

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 224 KB
• Volume: 225
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1999.2231

✦ Synopsis

In aero engines, amplitudes of blade vibrations are frequently reduced by centrifugal #yweights, called friction peak limiters, which exert a dry friction force under the blade platforms. To understand the physical phenomena which cause reduction of vibration amplitudes, a system comprising two degrees of freedom, but generally representative of a real system, is studied. It is shown that system response can be found by analyzing the sliding and the stuck state. It appears therefore that the most important phenomenon controlling movement is the change of boundary conditions. In addition, the e!ect of other parameters is analyzed. The e!ect of a large di!erence between the fundamental frequencies is demonstrated as well as the in#uence of the dynamic friction coe$cient for lengthening the plateau of the e$ciency curve. All these results can be used to improve numerical methods of resolution.