In order to solve the problem that the low-order torsional model of the integrated helicopter/turboshaft engine system varies significantly under variable rotor speed, research on adaptive torsional vibration suppression methods is conducted. Meanwhile, two adaptive torsional vibration suppression methods, respectively based on fast Fourier transform (FFT) and the least mean square (LMS), are proposed to suppress the low-order torsional vibration mixing in power turbine speed. Moreover, these two torsional vibration suppression methods are compared in real-time performance, suppression effect and robustness of performance. The simulation results show that when and only when the designed frequency of the notch filter is away from the low-order torsional model, the suppression effect of adaptive torsional vibration filter based on FFT is better than that of constant-coefficient notch filter, but the real-time performance is worse. On the contrary, no matter how the low-order torsional model varies, the adaptive filters based on LMS can suppress the low-order torsion vibration by more than 82.0% and have more superior real-time and robustness performance, which can overcome torsional vibration instability of turboshaft engine control system under variable rotor speed effectively with more remarkable adaptive ability.

中文翻译：

---

变旋翼转速直升机/涡轴发动机系统自适应扭振抑制方法研究

为解决直升机/涡轴发动机一体化系统低阶扭转模型在变旋翼转速下变化较大的问题，开展了自适应扭转振动抑制方法研究。同时,提出了两种分别基于快速傅里叶变换(FFT)和最小均方(LMS)的自适应扭振抑制方法来抑制动力涡轮转速中的低阶扭振混合。此外，还比较了这两种扭转振动抑制方法的实时性、抑制效果和性能的鲁棒性。仿真结果表明，当且仅当陷波滤波器的设计频率远离低阶扭转模型时，基于FFT的自适应扭振滤波器抑制效果优于恒系数陷波滤波器，但实时性较差。相反，无论低阶扭振模型如何变化，基于LMS的自适应滤波器都能抑制82.0%以上的低阶扭振，具有更优越的实时性和鲁棒性，可以克服扭振有效地解决了变转子转速下涡轴发动机控制系统的不稳定性，具有更显着的自适应能力。