【摘要】 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。更多还原

【Abstract】 Dynamic simulation of a triangle fin heat exchanger utilized in Aircraft Environment Control System(AECS) was performed.The physical parameters of heat exchanger were identified using the Kalman method.Then the behaviors of the heat exchanger with single/double faults were simulated and the changes of the physical parameters from normal to fault conditions were analyzed.Then simulations were carried out with the given input and output data,and fault detection and fault isolation were done through the identification of changes of parameters.It is indicated that the Kalman method is feasible for fault diagnosis.The relationship between the changes of physical parameters and the fault modes provides a useful approach to define the faults and can be extend to heat exchangers applied in practical engineering.更多还原