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以飞机环境控制系统部件换热器为研究对象进行故障诊断研究,在建立换热器动态模型的基础上,选择基于参数估计的卡尔曼滤波(Kalman)法对换热器物理参数进行辨识,主要分析了单一故障和双故障发生时,换热器物理参数变动情况。仿真研究中,根据输入输出数据,辨识出物理参数的变动,实现故障检测和分离。结果表明,Kalman法可以准确辨识换热器物理参数变动,实现换热器故障诊断,同时得到了换热器物理参数与故障模式的对应关系,对实际工程中换热器故障诊断有一定的指导作用。
Taking the heat exchanger of aircraft environmental control system as the research object, the fault diagnosis research is carried out. Based on the dynamic model of the heat exchanger, Kalman filter (Kalman) method based on parameter estimation is used to identify the physical parameters of the heat exchanger. The change of physical parameters of heat exchanger was analyzed when a single fault and double fault occurred. In the simulation research, according to the input and output data, the change of the physical parameters can be identified and the fault detection and separation can be realized. The results show that the Kalman method can accurately identify the physical parameters of the heat exchanger and achieve the fault diagnosis of the heat exchanger. At the same time, the corresponding relationship between the physical parameters of the heat exchanger and the fault modes is obtained, which gives some guidance to the fault diagnosis of the heat exchanger in practical engineering effect.