带桨间磁流变阻尼器的直升机“地面共振”开-关控制研究

On-off Control for Ground Resonance of Helicopter Using Inter-Connected Blade Magnetorheological Dampers

防止直升机出现“地面共振”是直升机研制过程中必须解决的动力学问题。磁流变阻尼器作为可控阻尼器具有结构紧凑、功耗小及输出力大等优点。本文建立了带有桨间磁流变阻尼器的直升机“地面共振”空间模型运动方程 ,采用开 -关 ( on-off)控制方法来抑制“地面共振”,并进行了仿真计算和控制结果分析。结果表明 ,采用桨间磁流变阻尼器抑制“地面共振”比粘弹性阻尼器有更好的可控性。

One of the important problems needed to be solved in the helicopter research and development is to avoid 'ground resonance'. The Magnetorheological (MR) dampers are used as kinds of controllable dampers, which are compact, low operating power and a potential for sufficient forces for applications. The dynamic equations for spatial model of ground resonance of the helicopter with inter connected blade MR dampers are deduced. The on off control methodology is used to suppress the ground resonance. Simulations of the system and analysis for control effectiveness are made. Simulational results show that on off control scheme based on MR dampers can suppress ground resonance of helicopters effectively and the control performance by using inter connected blade MR dampers is better than visco elastic dampers.