基于动态吸振器的高超声速复合材料壁板颤振抑制及其优化设计

研究了动态吸振器对高超声速流中复合材料壁板颤振的抑制作用.将壁板和动态吸振器的相互作用力描述为两者相对位移和相对速度的函数,利用von-Karman非线性应变-位移关系和3阶非线性活塞理论,根据哈密顿原理和牛顿第二定律分别建立了壁板和动态吸振器的运动微分方程.采用模态假设法对系统进行离散并进行数值模拟,对动态吸振器的安装位置进行了优化设计.数值计算结果表明:合理选择动态吸振器参数可使壁板临界颤振动压提高51.7%,同时可降低颤振后极限环振动的幅值.

Suppression of supersonic flutter of laminated composite panel using dynamic absorber device and its optimal design

The problem of suppression of supersonic flutter of laminated composite panel using dynamic absorber device was investigated.The interaction forces between the panel and the dynamic absorber device were expressed as the functions of relative displacement and velocity of the panel and the absorber.Based on the von-Karman nonlinear deflection panel theory and the 3rd-order nonlinear piston theory,the equations of motion of the panel and the absorber were established according to the Hamilton principle and the Newton second law of motion.Then the assumed modal method was adopted in the discrete procedure,and the numerical simulation was conducted.The coordinate of the absorber was optimized.The simulation results indicate that the critical flutter dynamic pressure can be enhanced by 51.7% under certain parameters of the absorber,and the amplitude of the limit cycle oscillation can also be suppressed.