多回路气动伺服弹性系统稳定裕度的确定  

Research on Stability Margin of a Multi-Loop Aeroservoelastic System in Flight Test

作　　者：李洪超[1] 史忠科[1] 田福礼[2] 唐炜[1] 

机构地区：[1]西北工业大学自动化学院,陕西西安710072 [2]西北工业大学航空学院,陕西西安710072

出　　处：《飞行力学》2006年第3期22-25,共4页Flight Dynamics

基　　金：国家自然科学基金资助项目(60134010)

摘　　要：为研究气动伺服弹性问题对飞机稳定性的影响,提出了一种基于μ分析的采用试飞数据确定伺服弹性系统稳定裕度的新方法。采用小波时频去噪的方法对试飞数据进行了预处理,研究了开环增益的非参数估计方法,并建立了μ分析与开环增益矩阵的理论联系,实现了无模型的在线稳定性分析。最后将新方法与回差矩阵最小奇异值方法进行了比较,验证了该方法的优越性。A new method based on μ analysis is presented to evaluate the stability margin of a multiloop aeroservoelastic system from flight test data. The flight data is preprocessed to remove noise by the wavelet filter in time-frequency domain. A relation is constructed between μ analysis and open-loop gain matrix, which can be estimated by non-parametrlc identification. Hence without a complex aircraft structure model, this method still can be implemented for on-line stability evaluation. Finally, the results are compared with return difference matrix method to illustrate the efficiency of the new method.

关 键 词：气动伺服弹性 Μ分析 多回路 稳定裕度 

分 类 号：V249.1[航空宇航科学与技术—飞行器设计]