平板耦合颤振过程中气动能量转换特性

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (10) : 55-61.

论文

平板耦合颤振过程中气动能量转换特性

刘祖军1,2杨詠昕 2 葛耀君 2

作者信息 +

Study on the aerodynamic energy transfer characteristicsin coupled flutter of plate

Liu Zu-jun1,2 Yang Yong-xin2 Ge Yao-jun2

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文章历史 +

摘要

基于分步分析思路对耦合颤振运动方程进行解耦, 通过引入考虑阻尼影响的初始运动方程,建立了结构—气流系统颤振能量机理的分析框架. 结合平板风洞试验研究了颤振发生过程中系统内主要气动能量的变化规律.研究结果表明在平板耦合颤振过程中联合气动导数数建立了能量在两个自由度上传递的途径,并且在颤振发生过程中由于扭转振动和竖向振动的相位差逐渐减小,使得该联合气动导数对系统的输能能力不断增强。扭转气动阻尼是系统的主要耗能项,并且耗能能力与导数的数值密切相关而与相位差没有关系。扭转气动刚度在一个振动周期内对系统能量几乎没有贡献,对耦合颤振的影响很小。

Abstract

Flutter coupled motion equations were uncoupled by step-by step analysis method. The flutter energy mechanism analysis framework of structure-fluid was established through consider the damping effects of motion equation. The main aerodynamic energy input characteristics of plate were studied by wind tunnel test. The result showed that coupling aerodynamic derivatives built energy transmission way in two degrees of freedom .Phase difference between the torsional vibration and the vertical vibration was gradually decreased in the flutter, which made coupled aerodynamic derivatives transport energy ability become strong. The energy of system was mainly dissipated by the aerodynamic damping of twist motion .The energy dissipation capacity was closely related with aerodynamic derivative , but had no relationship with the phase difference. The aerodynamic stiffness of twist motion had no contribution to the system energy in a vibration cycle, so it had very small inference on the coupled flutter.

导出引用

刘祖军;杨詠昕葛耀君 . 平板耦合颤振过程中气动能量转换特性[J]. 振动与冲击, 2013, 32(10): 55-61

Liu Zu-jun;Yang Yong-xin Ge Yao-jun. Study on the aerodynamic energy transfer characteristicsin coupled flutter of plate[J]. Journal of Vibration and Shock, 2013, 32(10): 55-61