边界阻尼力对复合材料层合板主参激共振的影响

兰向军;冯志华;朱晓东

振动与冲击 ›› 2014, Vol. 33 ›› Issue (21) : 60-66.

PDF(1800 KB)
PDF(1800 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (21) : 60-66.
论文

边界阻尼力对复合材料层合板主参激共振的影响

  • 兰向军,冯志华,朱晓东
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Effects of boundary damping on the principal parametric resonance of a composite laminated plate

  • LAN Xiang-jun, FENG Zhi-hua, ZHU Xiao-dong
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摘要

结合经典层合板理论与von Kármán理论并利用Galerkin截断,获得受面内激励具边界阻尼力的四边铰支正交对称铺设矩形层合薄板的动力学控制方程。基于多尺度法,形成了确定性激励下系统主参激共振的近似解析形式,结果表明:系统平凡响应不稳定区间带宽只与线性阻尼及激励幅值有关,而边界阻尼力的大幅增加可有效减小主参激共振时非平凡响应的幅值及共振频率范围。随后,将确定性激励扩展为窄带随机激励,结合所得Foker-Planck-Kolmogorov方程并采用有限差分法,数值分析了系统稳态响应在平凡与非平凡解支间的随机跳跃现象,结果表明:微小的边界阻尼力增量,将导致系统的稳态响应从非平凡解支跳向平凡解支。

Abstract

Based on the classical laminated plate theory and von Kármán-type equations, the nonlinear governing equations of motion for the composite laminated plates under axial loading, in which, the boundary damping is taken into consideration, are derived. Galerkin approach is employed to transform the governing partial differential equations to ordinary differential equations. Using the method of multiple scales, the approximate solution of the plates by deterministic parametric resonance excitation are obtained and analyzed. Results show that the unstable interval bandwidth for the trivial solution is only related with linear damping, whereas the boundary nonlinear damping can weaken the resonance amplitude of the non-trivial solution and reduce the corresponding resonance range effectively. On the basis of nonlinear dynamic model, the resulted Foker-Planck-Kolmogorov equation is analyzed by using the narrow-band random excitation combined with finite difference method. The stochastic bifurcation and jump phenomenon of the response for the amplitude stationary joint probability density caused by the boundary nonlinear damping are sequentially investigated. Results show that a very small increment of the damping will induce a sharp jumping of the stationary motion from the non-trivial solution to the trivial one.

关键词

复合材料层合板 / 边界阻尼 / 主参激共振 / 窄带随机激励 / 随机跳跃

Key words

composite laminated plate / boundary damping / principal parametric resonance / narrow-band random excitation / stochastic jump

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兰向军;冯志华;朱晓东. 边界阻尼力对复合材料层合板主参激共振的影响[J]. 振动与冲击, 2014, 33(21): 60-66
LAN Xiang-jun;FENG Zhi-hua;ZHU Xiao-dong. Effects of boundary damping on the principal parametric resonance of a composite laminated plate[J]. Journal of Vibration and Shock, 2014, 33(21): 60-66

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