采用磁流变阻尼器的直升机"地面共振"分析

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。通过分析计算可以得出，磁流变阻尼器能在不同情况下提供“地面共振”所要求的阻尼，达到抑制“地面共振”的目的。

Ground Resonance Analysis of Helicopter with Magnetorheological Lag Damper

Magnetorheological (MR) damper is the more promising semi active devices for vibration control of structures. External energy required by the adjustable fluid damper is minuscule while speed of its response is on the order of milliseconds. Based on the excellent performance, using the MR damper as the lag damper of rotor can adaptively control the helicopter ground resonance. Due to no linear pro perties of the MR damper, the equivalently linearized damping coefficient is calculated by using the energy method. Through setting an analytical model with couple of rotor and fuselage of helicopter, the stability area of the helicopter ground resonance is obtained. The calculated areas show that the MR lag damper can supply the required damping to control the ground resonance at the different rotating speeds.