采用乘性速压摄动的频域气动伺服弹性稳定性分析

摘要

在乘性速压摄动的频域颤振预测方法基础上,将乘性速压摄动表达式引入到频域气动伺服弹性运动方程中,建立了其μ框架,从而可以通过频域μ分析来确定气动伺服弹性稳定临界点。该方法直接应用频域气动力进行求解,属于完全频域方法。用该方法分析了某型飞机及其偏航/滚转飞控系统构成的多输入/多输出气动伺服弹性系统的稳定临界点。结果表明该方法与p-k法所得的结果吻合很好。%The multiplicative perturbation to dynamic pressure is introduced to the frequency domain equation of aeroservoelastic motion.The corresponding μ framework is formulated and the critical stability point can be predicted with frequency domain μ analysis.This method is a fully frequency domain method,which can directly use frequency domain unsteady aerodynamics.Theoretically,this method possesses good consistency and will provide more reasonable results.Numerical study is implemented for an aircraft augmented with multiple-input and multiple-output（MIMO） flight control system for yaw and roll motions.The results obtained with the present method agree well with those obtained by the p-k method.