智能旋翼连续时间高阶谐波控制稳定性分析

后缘襟翼智能旋翼是一种行之有效的直升机旋翼振动主动控制技术,高阶谐波控制算法广泛应用于智能旋翼振动控制领域,其控制器参数直接影响振动控制性能和稳定性。基于后缘襟翼智能旋翼悬停实验数据,笔者经拟合得到智能旋翼系统的传递函数,建立智能旋翼参数化仿真模型,并进行了垂向载荷振动控制仿真。通过系统开环传递函数Nichols图的方式对振动控制系统的稳定性和稳定裕度进行了分析,在保证振动控制性能的前提下,获得了控制器时间常数和相角特性对控制系统稳定裕度的影响规律,为后续智能旋翼振动控制实验中控制器参数调整提供参考。

Stability Analysis of Continuous-Time Higher Harmonic Control for Active Rotor

Active rotor with trailing-edge flaps is an effective methodology for helicopter rotor vibration control. Continuous-time higher harmonic control (CTHHC) algorithm is widely used both in simulation and experiment to alleviate rotor vibratory loads. The vibration control performance and stability of the active rotor system are mainly dependent on the parameters of CTHHC controller. A parametric model of active rotor for active vibration control, including the plant model in the form of transfer function which is obtained based on data of hover test, is established, and the simulation is conducted using this model. Nichols chart is employed to analyze the stability and stability margin of the active rotor system. The time constant and phase characteristics of the system are tuned to extend the stability margin of the system without remarkable attenuation of the vibration control performance. The effect of parameter adjustment on system performance and stability is studied through this simulation analysis, and it will be instructive for tuning controller parameters in active rotor experiments.