Analysis influence of engine’s dynamic characteristics on helicopter’s flight quality

This article analyses the influence of an engine’s dynamic characteristics on a helicopter’s flight quality during hover/low speed forward flight. Firstly, based on the power matching relationship between the engine and the helicopter, a helicopter-engine coupling model was established. The torque response, altitude response, and collective yaw coupling characteristic in the ADS-33E-PRF flight quality criteria was used to quantitatively evaluate the influence of the dynamic characteristics. The results indicate that the lag in the engine’s output leads to deterioration in the flight quality of the helicopter such as torque and collective-yaw coupling motion and has a negative influence on the helicopter’s altitude response flight quality. As the forward flight speed increases, the influence of the engine on torque response characteristics and collective yaw coupling effect further increases, but the adverse influence on altitude response is alleviated. This study provides reference for the design of helicopter-engine coupling control laws.