磁流变阻尼器用于直升机“地面共振”半主动抑制

SEMI-ACTIVE SUPPRESSION OF HELICOPTER GROUND RESONANCE USING MAGNETORHEOLOGICAL DAMPER

磁流变阻尼器是一种半主动的阻尼装置,将其用作桨叶减摆器和起落架阻尼器是直升机“地面共振” 抑制的一项新措施。针对磁流变阻尼器的非线性特性,采用能量法得到了磁流变阻尼器的等效线性阻尼。建立了含磁流变阻尼器的机体平面二自由度和刚性桨叶的“地面共振”分析模型,得出了直升机“地面共振”的稳定性区域。分析计算表明,磁流变阻尼器能在不同情况下提供抑制“地面共振”所需要的阻尼,达到半主动抑制“地面共振”的目的。

Magnetorheological (MR) dampers are promising semi-active control devices for vibration control of structures. External energy required by the adjustable fluid damper is minuscule while its response time is on the order of milliseconds. The MR damper is used as the lag damper of rotor and damper of landing gear to suppress adaptively the helicopter ground resonance. Due to the nonlinear properties of MR damper, an equivalent linearized damping coefficient which is more convenient for the analysis of the application of the MR damper in vibration control, is calculated using energy method. Through modeling the coupled rotor/fuselage system of helicopter, the stability area of helicopter ground resonance is obtained. Numerical results indicate that MR dampers can supply the required damping to suppress the helicopter ground resonance under different operating conditions.