基于动力学模型的旋翼动平衡故障仿真及诊断

旋翼桨叶质量不平衡造成旋翼动不平衡,从而引起直升机振动。针对旋翼动不平衡故障,建立直升机动力学模型,对桨叶质量不平衡进行故障仿真及分析,建立质量不平衡故障与调整配重的对应关系；进而提出一种 BP神经网络和遗传算法结合的旋翼调整方法,建立输入参数与桨叶配重之间的模型,将四片桨叶的挥舞角和机体横滚、俯仰 2个方向的加速度值及相位作为网络输入,通过学习训练,根据输入数据预测调整配重,从而减小直升机 振动,解决旋翼动不平衡问题。

Fault Simulation and Diagnosis of Helicopter Rotor Dynamic Balance Based on Dynamic Model

Rotor mass unbanlance leads to dynamic unbalance of rotor-system, thus it causes helicopter vibration. Accord.ing to the faults of rotor dynamic unbalance, the dynamics model of helicopter was constructed to simulate and analyzemass unbalance of blade,and the relation was found out between the mass unbalance and adjusting weight . And then amethodology of rotor adjustment was presented based on the combination of BP neural network and genetic algorithm, anda model was established between the inputs and weights that included the flapping angles of 4 blades and the accelerationsand phases of body roll and pitch. The model would predict the adjustment weights throught learning and training, so as toreduce the vibration of the helicopter, and solve the problem of rotor unbalance.