基于人机闭环稳定性的舵机速率限制边界

舵机速率限制是造成电传操纵飞机人机耦合的主要原因。利用描述函数法对舵机速率限制非线性进行建模,分析舵机速率限制非线性、人机耦合发生频率及人机闭环稳定性间的关系,并基于此提出舵机速率边界的确定方法;以典型放宽静稳定性飞机为例,基于最优McRuer驾驶员模型,确定人机闭环稳定性所需的最小舵机偏转速率;基于开环起始点(OLOP)准则对所确定的速率限制边界进行验证。结果表明:本文提出的舵机速率边界的确定方法最小成本地避免了人机耦合;所确定的舵机速率限制边界与OLOP准则边界对应的舵机速率基本吻合,即所建立的舵机速率限制边界确定方法合理。

Actuator Rate Limiting Boundary Based on Pilot-Vehicle System Stability Requirements

Actuator rate limiting is the primary course of Aircraft Pilot Coupling (APC) for fly-by-wire (FBW) aircrafts. To avoid APC with minimum cost, the rate limiting boundary determining method is proposed based on the Pilot Vehicle System (PVS) closed-loop stability requirements. The actuator rate limiting is modeled by describing function. The relationships between actuator rate limiting, APC onset frequency and PVS closed-loop stability are analyzed. On the basis of this, an actuator rate limiting boundary determining method is proposed. A Relaxed Static Stability (RSS) aircraft is taken as an example, based on the optimized McRuer pilot model, the longitudinal actuator rate limiting boundary that can ensure the closed-loop stability is determined. The OLOP criterion evaluating results shows that the determined actuator rate limiting boundary coincides with the actuator rate corresponds to OLOP criterion boundary, indicating that the proposed rate limiting boundary determining method is reasonable.