直升机复合材料传动轴的主共振分析

传动轴的主共振的振幅与传动轴的强度计算有关。在根据质心定理和Galerkin法求得非惯性移动系下直升机的倾斜两端支承纤维增强复合材料传动轴的弯曲运动方程基础上,用多尺度法求得稳态下主共振的一次近似定常解,再分析了最大振幅、振幅突变性等主共振问题。得到了复合材料传动轴比钢、铝合金传动轴运动稳定性好、主共振的振幅小等结论。提出通过加大阻尼减小或消除振幅突变,使传动轴运动稳定。在挠度大的轴段上增加阻尼能减小弯曲主共振的振幅、充分发挥阻尼的作用、优化轴的重量。

MAIN RESONANCE ANALYSIS OF A COMPOSITE HELICOPTER DRIVE SHAFT

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.