【摘要】 摘要:采用Laguerre(拉格里)滤波器提出了非线性系统仪表故障诊断新方案。由于拉格里滤波器的基函数彼此正交,滤波器参数收敛快而精确,因此采用拉格里滤波器对对象进行在线建模;根据建模的对象对输出进行单步预测;与实际对象输出进行比较以产生残差信号;通过对残差信号的分析对3种常见的仪表故障进行诊断。对某电厂非线性锅炉汽轮机协调系统中的仪表故障诊断进行仿真研究,结果表明该仪表故障诊断方案对参数扰动有很强鲁棒性,结果令人满意。更多还原

【Abstract】 A new scheme for instrument fault diagnosis in nonlinear systems is presented. Since the basis functions of Laguerre filter are orthonormal, the parameters of filter can be converged rapidly and accurately. Hence, the plant can be modeled via Laguerre filter. The output of plant can be predicted according to the modeling plant, then the residual between the real output and predicted output can be obtained. Consequently, three kinds of instrument faults are diagnosed by analyzing the residuals. Finally the scheme is used to identify the instrument faults in a nonlinear boiler-turbine coordinate system, the simulation shows the results are satisfactory.更多还原