飞机航电设备的半主动磁流变控制

Semi-active vibration control of aircraft avionics using MR dampers

本文提出一种新的航电设备减振控制策略,采用半主动磁流变阻尼器与小阻尼柔性橡胶支座来取代目前采用高阻尼刚性橡胶支座的方法,以降低对航电设备的耐振要求,增强飞机飞行的安全性。本文建立了航电设备减振控制的两自由度刚体平-扭耦联模型,荷载激励考虑了基底平动与转动加速度。磁流变阻尼器的半主动控制算法选用限幅最优控制算法,主控制器为H2/LQG控制器,并采用一种加速度反馈的控制策略。针对目前的被动控制方案,本文研究了支座阻尼对减振控制效果的影响。为了得到最优的半主动控制效果,本文对控制器的权矩阵进行了参数优化分析。文中针对一系列工况详细比较了本文所提出的半主动控制策略与目前被动控制策略的减振控制效果。仿真分析结果表明,磁流变阻尼器可以非常有效地减小航电设备的动力反应,新的减振控制策略远优于现有的被动控制方案。

This paper proposes a new control strategy for aircraft avionics, in which semi-active MR dampers are combined with low-damping rubber isolator mounts as an attractive alternative to current high-damping rubber mounts. The development of such a control system would alleviate the need for highly ruggedized avionics boxes and increase the in-flight safety of the aircraft. A two degree-of freedom, rigid-body model of the avionics box is built, and the excitations are assumed to be the vertical and rotational accelerations. In the semi-active control system, a clipped optimal control algorithm is employed and an HJLQG controller is selected as the primary controller. Acceleration feedback to the controller is provided by accelerometers located on the avionics package. Simulations are conducted to compare the performance of the proposed control strategy with that of the current passive one. Results indicate the implementation of MR dampers for response reductions in avionics systems is quite effective and the proposed semi-active control strategy far outperforms the current passive one.