多滤波器并联方式解决直升机动力传动链扭振耦合

为了解决直升机动力传动链扭振系统与动力控制系统的耦合不稳定性问题,提出了一种采用多个陷波滤波器并联组合、根据发动机不同的工作模态选择不同滤波器实现扭振滤波的方法.对陷波滤波器进行了改进,使得引入控制系统通频带的附加相移减小,降低了对系统控制性能的影响.通过直升机联合试验,验证了该方法是有效的.

Elimination of Coupling Instability Using Few Parallel Connection Notch Filters for Helicopter Rotor/Power Train

A solution was proposed which eliminated the coupling instability between helicopter power transmitting train torsional vibration system and power control system.A combination of notch filters in parallel and filters selected according to engine working modes have been used to achieve torsional vibration filtration.The modification of the notch filter made the extra phase-shifting introduced to the control system passband reduced and so the control performance was improved.The method was demonstrated successfully on a helicopter integrated test-bed.