直升机“地面共振”力学模型的再探

 真实直升机是桨叶具有摆振与挥舞自由度、组成起落架的缓冲支柱与轮胎具有随频率变化的动特性的“空间模型”。本文第一次导出了描述上述系统的“地面共振”运动微分方程,给出了确定动稳定性的计算方法。通过算例,证明本文提出的力学模型与计算方法的合理性与有效性。

FURTHER RESEARCH ON MECHANICAL MODEL FOR'GROUND RESONANCE"OF HELICOPTERS

Helicopters should be expressed by space model in which the rotor blades have flag and lap degrees of freedom and the landing gears composed of shock absorbers and wheel tyres provide characteristics varied with frequencies. The paper derives augmented differential equations of motion for the system mentioned above for the first time. Computation methods are also given to determine the dynamic stability. The computation examples prove the reasonableness and effectiveness of the mechanical model and the computational methods presented in the paper.