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空调系统作为现代飞机空气管理系统的一部分,对于机舱内温度、空气的调节起着至关重要的作用,其工作正常与否直接影响着飞机的乘坐舒适性。因此,研究空调系统的故障诊断具有十分重要的意义。文中从空调系统的物理结构出发,建立了单级循环结构图,得到了各环节的数学模型。采用自适应数值滤波器进行故障检测,引入3σ原则作为故障判断准则,并结合数学模型提出了联合故障诊断的思想,对系统故障进行定位和故障类型的判断。最后利用计算机仿真实验进行验证,仿真结果表明该联合故障诊断思想能够有效地进行故障诊断和定位,并实现了对传感器故障和元部件故障的准确区分。
Air conditioning system as part of the modern aircraft air management system plays an important role in regulating the temperature and air in the cabin. Its normal operation directly affects the ride comfort of the aircraft. Therefore, it is very important to study the fault diagnosis of air conditioning system. In this paper, starting from the physical structure of air-conditioning system, a single-stage cyclic structure diagram is established, and the mathematical models of each phase are obtained. Adopt the adaptive numerical filter to carry on the fault detection, introduce 3σ principle as the fault judgment criterion, and combine the mathematical model to put forward the idea of joint fault diagnosis, locate the fault of system and judge the type of fault. Finally, computer simulation is used to verify the simulation results show that the joint fault diagnosis method can effectively diagnose and locate the fault, and realize the accurate distinction between the sensor fault and the component fault.