Abstract
Main resonance amplitude of a shaft is concerned with the strength calculation. Based on bending motion equation of a tilting fiber composite helicopter drive shaft with two supports obtained under non-inertia movement coordinate system by theorem of the motion of center of mass and the method of Galerkin, an approximate steady-state solution of the main resonance is obtained by method of multiple scales. The maximum amplitude, amplitude jump characteristic and so on are analyzed. Conclusions of that the motion stability of a fiber composite drive shaft is better and the main resonance amplitude is smaller than that of a drive shaft of steel or aluminum are produced. It is presented that the amplitude jump of a shaft is decreased or removed, and the motion stability is obtained by increasing damping. In condition of increasing damping in the place of larger deflection of a shaft, the amplitude of main resonance can be decreased, effect of the damping is fully brought into play and weight of the shaft is optimized.
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