Fault Simulation And Impact Analysis Of Aircraft Temperature Control System

The aircraft temperature control system is an important part of the environmental control system,and it also provides an important guarantee for the cooling of the airborne electronic equipment and the comfort and safety of the cabin environment.Due to the complex function of the temperature control system and the harsh working environment,various faults occur during its working process.The occurrence of faults may cause the output of the component or system to deviate from the set value of the system,which in turn affects the thermal environment of the cabin under the control of the temperature control system.In order to reduce the occurrence of aircraft temperature control system failures and to ensure the comfort of the thermal environment in the cabin,it is necessary to analyze the impact of different faults in the aircraft temperature control system.This subject takes the aircraft temperature control system as the research object.Firstly,the temperature control system and the aircraft cabin are modeled and simulated,and the common faults such as heat exchanger leakage,circuit valve jam and temperature sensor gain drift are analyzed by fault injection.Then the impact of different faults on components and system output are analyzed.Secondly,the distribution of cabin thermal environment under fault conditions is further studied by setting fault various air supply modes.Finally,the thermal comfort evaluation index PMV-PPD,temperature non-uniformity and velocity non-uniformity are used to assess the distribution status of cabin thermal environment under fault conditions.The results show that different fault modes not only affect the flow or temperature output of components and system,but also affect the thermal comfort,temperature or velocity uniformity distribution of the cabin.The research results provide the simulation analysis basis for impact research and cabin thermal environment optimization under common fault conditions.