可重复使用运载器气动舵面损伤的故障检测与诊断

Fault Detection and Diagnosis for Aerodynamic Surface Damage of a Reusable Launch Vehicle

可重复使用运载器再入飞行过程中,气动舵面的损伤故障会影响其飞行控制系统的性能,威胁运载器的安全。文章结合运载器气动布局的特点,利用运载器发生舵面损伤故障时气动系数变化的规律:正常气动系数向量与故障气动系数向量之差与正常气动系数向量成比例,而比例系数就是舵面损伤失效率。依据舵面失效率对该舵面的角加速度进行估算,并与实际的角加速度比较形成残差,实现对舵面损伤的故障检测与诊断。仿真结果表明,该方法是一种有效检测与诊断的方法,能满足工程应用要求。

During the reentry stage of a reusable launch vehicle （ RLV）, aerodynamic surface damage of the vehicle may affect its capability and threaten its safety. When the vehicle surface is damaged, the change of aerodynamic parameters follows a rule, i. e. , the difference between the normal aerodynamic parameter vector and the fault aerodynamic parameter vector is proportional to the normal vector, and the proportion coefficient is the failure rate of surface damage. Based on the aerodynamic structure of the vehicle, the angular acceleration of the damaged surface can be estimated by using the failure rate of surface damage. By comparing the estimated angular acceleration with the actual one, the residuals can be obtained to further implement fault detection and diagnosis for surface damage. The simulation results show that the proposed detection and diagnosis method is effective and can meet the application requirements.