飞机操纵面故障诊断及其性能评估

针对操纵面故障将严重影响飞机的飞行安全，提出一种能快速实现故障诊断及性能评估的系统方法。首先，当系统状态维数较高时，采用容积卡尔曼滤波算法的球形积分准则和径向积分准则优化Sigma 点的采样策略和权重分配，较好地解决了无迹卡尔曼滤波算法滤波性能明显下降的问题；然后，利用飞机等速平飞运动特征计算故障下的升力系数和阻力系数，得出能反映飞机性能的飞行包线；最后，通过仿真结果验证了本文所提方法的可行性。

AIRCRAFT CONTROL SURFACE FAULT DIAGNOSIS AND EVALUATION OF FLIGHT PERFORMANCE

An online fault diagnosis method is proposed to make sure that the aircraft flight is safe as the failure occurs in the control surface, and the evaluation of the flight performance can be made based on the fault diagnosis information. Firstly, in order to overcome the shortcoming of the filtering performance of the UKF (unscented kalman filter), which will be decreased as the system state has higher dimensions, a fault diagnosis method based on the cubature Kalman filter algorithm is designed. The problem that the filtering effect of the UKF with a high dimensional state is not ideal can be solved by using the spherical integral criterion and the radial integral criterion to optimize the Sigma point sampling strategy and the weight distribution of the UKF. Secondly, according to the characteristics of the aircraft leveled off with a constant velocity, the lift and drag coeflcients can be computed and the flight envelope is established to reflect the flight performance. Lastly, the simulation results verify that the proposed method is practical.