Health Management System Design Method for the Helicopters’ Gyroscope Based on Intermittent Fault Features and Built-in Test

In recent years, the method of time stress monitoring to improve the ability of fault prediction and false alarm recognition has attracted more and more attention. It is found that intermittent failure will increase with the aging of helicopter gyroscope. The time stress of helicopter gyroscope in the process of manufacture, transportation and use is the main reason of helicopter gyroscope aging. The intermittent failure characteristics of helicopter gyroscope can represent its healthy state. This paper briefly introduces the concepts of time stress and health management system. Then, a new design method of helicopter gyro health management system based on intermittent fault characteristics and in-flight testing is proposed. The system structure consists of five modules: sensor module, intermittent fault detection module, permanent fault diagnosis module, permanent fault prediction module and health management module. Finally, the structure and function of each module of helicopter gyroscope health management system are introduced in detail. Experiments show that this method can effectively improve the fault prediction and false alarm recognition ability of helicopter gyroscope.