结构非线性颤振半主动控制的理论及实验研究

 对结构非线性颤振的半主动控制即“颤振驯化”方案进行了理论及实验研究。以二无非线性颤振系统为对象,分析了半主动控制的原理及带有半主动控制环节后系统的响应特性。设计了相应的颤振半主动控制的风洞实验模型,系统响应信号的监测处理、刚度调节机构的运转控制由以8031芯片为主体的单片机来完成。风洞实验取得了良好的控制效果。

THEORETICAL AND EXPERIMENTAL INVESTIGATION OF SEMI-ACTIVE CONTROL OF STRUCTURAL NONLINEAR FLUTTER

Theoretical and experimental investigations are performed for the scheme of" fluttertaming"-semi-active control of structural nonlinear flutter. First, for a two-dimensionalnonlinear flutter system, the digital simulation method is used to analyze the principle of semi active control and to study the response characteristics of the system with control element. Simulation results show that, by using limit cycle characteristics of structural nonlinear flutter and automatical control technique, the nonlinear stiffness parameter of the flutter system can be adjusted automatically and hence the amplitude of the flutter response of the system can be suppressed into a very small stable region. In accordance with the analytical model, a wind tunnel test model of semi - active flutter control is designed: the monitoring of response signal and the controlling of stiffness adjusting micromotor are performed by an 8031 microprocessor. Wind tunnel tests show that the nonlinear flutter can be controlled effectively by this technique. This study provides a new approach of flutter suppression.