飞行器渐变加速对碰摩转子系统振动响应的影响

Study on Nonlinear Characteristics of a Rotor System with Impact-Rub in an Asymptotic Accelerating Aircraft

研究渐变加速的飞行器内碰摩转子系统的非线性特性。研究模型为光滑处理后的连续的Jeffcott转子碰摩模型。通过一无穷次可微的实函数生成的函数来模拟飞行器的渐变加速度变化,并假设飞行器在垂直平面内运动。研究结果表明:原已碰摩的系统会因飞行器的加速而加剧碰摩;原未碰摩的转子系统会因飞行器加速造成的振幅增大而引起转子与静子碰摩;飞行器的加速可能改变转子系统的稳定性;不同的渐变加速方式会使飞行器内的转子系统呈现不同的非线性行为。

A model of a maneuvering nonlinear rotor system with step impact-rub force is given. The rotor system locates in an aircraft flying with an asymptotic acceleration. The step impact-rub force is smoothed by an infinitely differentiable function. The conclusion shows that the amplitude of rotor system increases at the beginning of aircrafts acceleration. The impact-rub may occur due to the increase of amplitude of rotor system even though there is no impact-rub before the acceleration. When the aircraft accelerates, the original impact-rub of rotor system may become serious, and the stability of rotor system may lose. The rate of accelerating affects the response of rotor system obviously.