基于状态空间涡格法的阵风减缓分析

阵风响应计算及阵风减缓控制系统设计是飞行器气动弹性分析中的重要内容。基于状态空间涡格法（VLM）建立飞行器阵风气动力模型，给出有限元结构模态及控制面模态广义自由度与涡格法控制点边界条件的插值关系，建立适用于复杂模型的阵风响应分析方法，弥补了传统阵风响应分析方法需要进行有理函数拟合或迭代计算资源消耗大等不足。在此基础上，基于经典PID控制方法设计阵风减缓控制系统，仿真得到离散阵风及von Karman连续阵风激励下的系统开/闭环时域响应情况，对比响应幅值计算减缓率。仿真计算结果表明:根据所提方法建立的阵风响应分析方法准确，阵风减缓控制系统能有效降低原气动弹性系统的阵风响应。 

Gust load alleviation analysis based on vortex lattice method in state-space form

Gust response and gust load alleviation control system design is an important issue in aeroelasticity. This paper presents a gust response model based on the vortex lattice method (VLM) in state-space formulation and gives the couple relationships between finite element method modes/control surface modes and boundary conditions of VLM, which can be applied to complicated aircraft model. This method can avoid the disadvantages of the traditional gust response analysis method with no requirement of rational function assessment and iteration calculation with lots of resources. Introducing the traditional PID control algorithm, a gust load alleviation system is given, and gust time response of open loop/closed loop under a discrete gust and von Karman continuum gust excitation are presented. The alleviation effect can be solved by contrasting the response amplitude. The simulation results show that gust response analysis results based on this method are accurate and the gust load alleviation control system can alleviate the load response of the original aeroelastic system effectively.