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航空发动机转子叶片主要有以下三种振动形式:弯曲振动、扭转振动、弯扭耦合振动.在叶片的振动中,当强迫振动的频率与叶片的固有频率相同时就会引起共振而造成叶片破坏,故知道叶片自由振动的固有频率就显得尤为重要.根据有限元分析,叶片一阶振型表现为弯曲变形,二阶振型表现为扭转变形,本文分别讨论了叶片的自由弯曲振动及自由扭转振动固有频率的理论计算方法,为航空发动机转子叶片振动理论做一些基础性的准备工作.
Aeroengine rotor blades mainly have the following three types of vibration: bending vibration, torsional vibration, bending and torsional coupled vibration.In the vibration of the blade, when the frequency of forced vibration and the natural frequency of the blade are the same, resonance will be caused and the blade will be damaged, Therefore, it is very important to know the natural frequency of blade’s free vibration.According to the finite element analysis, the first-order mode of the blade shows the bending deformation and the second-order mode shows the torsional deformation.This paper discusses the free bending vibration of the blade and the free torsional vibration The theoretical calculation method of natural frequency makes some basic preparations for the vibration theory of aeroengine rotor blades.