Abstract
In aero engines, amplitudes of blade vibrations are frequently reduced by centrifugal flyweights, 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 effect of other parameters is analyzed. The effect of a large difference between the fundamental frequencies is demonstrated as well as the influence of the dynamic friction coefficient for lengthening the plateau of the efficiency curve. All these results can be used to improve numerical methods of resolution.
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