Fault Analysis of Typical Structure of Helicopter Transmission System Based on Lumped-Parameter Modeling

Most of the helicopter transmission systems are designed without redundancy. Once the transmission system fails or breaks down, it will affect the flight performance seriously. Therefore, it is very urgent and practical to develop the health monitoring on the key components of helicopter transmission system. From the perspective of dynamic modeling, it is a hot and difficult issue in the field of Prognostics and Health Management (PHM) to study the fault mechanism and analyze the impact on the dynamic characteristics of transmission system. The lumped parameter dynamics modeling methods were used to establish the typical structure model of a helicopter transmission system in healthy state and tooth breakage fault. Based on the simulation results and theoretical analysis, it can be seen that these models can effectively reveal the inherent characteristics and fault mechanism of the system.