基于凸多面体的结构性故障模型对飞行包线影响研究

Research for Flight Envelope Effect of Structural Damages Based on Convex Polyhedron Model

飞机的安全飞行范围和飞行限制条件是保证飞行安全的关键指标,飞机失事大多是在超出安全飞行包线范围下发生的;因此在飞行的过程中,实时准确的预估飞行包线,提供飞行保护措施,对提高飞行安全具有重要的意义。针对飞机结构性故障的特点,研究了飞机故障和飞行包线的定性定量关系。基于凸多面体模型建立了飞机小扰动线性故障模型。通过最小二乘参数估计方法进行气动参数的在线估计与辨识,确定故障情况下的气动参数,从而进行飞行包线快速估算,提供包线保护控制依据。仿真结果验证本方法对结构性故障情况下包线估算是快速有效的。

Most of aircraft accidents occurred due to exceeding the safe operating flight envelope, so it is signifi- cant to estimate flight envelope in real time under the occurrence of anomalous conditions, and protection control measures be provided to guarantee the safety of flight. The qualitative and quantitative relationship between structur- al damages and flight envelope for the characteristics of structural damages is investigated. A small perturbation lin- ear damage model has been developed based on convex polyhedron structure. The least-squares method is intro- duced to identify the current aerodynamic coefficients in the diagnosis and envelope assessment is effective. damage state. The simulation result shows the failure