考虑舵机动力学的舵回路系统颤振特性分析

Flutter Characteristics Analysis for Actuator-Fin System with Dynamic Stiffness

针对液压舵机动刚度特性,研究了舵回路系统(舵机系统和舵面耦合系统)的颤振特性。利用分支模态法建立了基于舵机系统动力学方程的时域和频域颤振计算模型,提出了2种考虑舵机动态特性的颤振求解方法,第1种方法思想是对舵回路系统模型在各种来流速度下进行状态矩阵的稳定性判断;第2种方法是将舵机复刚度特性包含在频域颤振方程中,使用迭代法求解该方程得到舵系统颤振特性,并验证了两种方法的可行性。分析结果显示舵机动态特性对颤振特性有着很大的影响,说明舵机动态特性使得颤振边界提高,为飞机系统设计和结构振动分析提供有用的边界支持和设计依据。

To the hydraulic actuator＇s dynamic characteristics, the flutter characteristics of an actuator - fin sys- tem are investigated. The component mode substitution method was used to establish the model of the flutter calcula- tion in time domain and frequency domain based on the fundamental dynamic equations of the actuator system. Two methods which can analyze the rudder＇s flutter stabilities were used respectively. Stability judgement of the state ma- trix was required in the time domain method. Actuator＇s impedance characteristics had to be included by the flutter e- quation which can be solved by the iterative method. The two method＇s validity was checked by numerical calculation rudder. The flutter characteristics significantly depend on the effects of the actuator. The result also indicates that it is necessary to consider seriously the effects of the actuator on the flutter characteristics to predict flutter behavior ac- curately when designing the actuators of aircraft.