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

发动机动态特性对直升机飞行品质的影响分析

National Key Laboratory of Helicopter Aeromechanics, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received: 24 September 2023

Abstract

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.

摘要

分析了发动机动态特性对直升机在悬停和低速前飞状态下飞行品质的影响。基于发动机与直升机之间的功率匹配关系, 建立直升机/发动机耦合模型。使用ADS-33E-PRF飞行品质规范中的扭矩响应、高度响应与总距偏航耦合特性指标, 定量评估发动机动态特性的影响。结果表明: 发动机输出滞后导致直升机扭矩与总距偏航耦合操纵品质下降, 同时会对直升机高度响应产生负面影响。随着前飞速度增加, 发动机对扭矩响应特性与总距偏航耦合效应的影响进一步加剧, 但对高度响应的不利影响得到缓解。该研究可以为直升机/发动机耦合控制律设计提供参考依据。