基于鲁棒H_2/H_∞估计的火炮位置伺服系统故障检测

Fault Detection Based on Robust H_2/H_∞ Estimation for an Artillery Position Servo-system

在滤波理论中发展起来的鲁棒H2/H∞方法,可以较好地解决在模型中带有不确定性的动态系统的鲁棒估计问题,能够使得稳态估计误差的方差和瞬时值均在一定的范围内。在对火炮位置伺服系统进行故障检测诊断的研究中,利用系统状态变量的鲁棒H2/H∞估计生成残差,以抑制模型误差与噪声对检测诊断的影响,同时,引入H-范数指标对故障检测滤波器的设计进行优化,既增强了故障检测系统对于模型误差与噪声的鲁棒性,又确保了对故障的灵敏性,从而有效地提高了系统的故障检测精度。

The robust mixed H2/H∞ estimation method can solve the problem of robust estimation for the dynamic system with model uncertainty and noise. The steady-state variance and the instantaneous value are not more than the individual upper bound. For the FDI research of an artillery position servosystem, the robust H2/H∞ estimation was used to generate the residual to restrain the influence of model uncertainty and noise on fault detection and diagnosis. And the H_ norm was used to optimize the design, the robustness to model uncertainty and noise was strengthened, and the sensitivity to the fault was guaranteed, as a result, the accuracy of FDI system was improved.