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为了实现航天器仪器安装板的振动控制,建立了采用Kagome夹心板制作的仪器安装板的有限元模型,并选用一种圆柱形黏弹性阻尼器,通过Biot模型建立了该阻尼器的有限元模型;计算了各阶模态中Kagome平面桁架的模态应变能在结构总模态应变能中所占的比例,将其作为模态可控度,再结合给定载荷情况下的模态位移来确定需要控制的模态,由此提出了一种利用模态应变能比来控制多模态振动的阻尼器布置方案.特征值分析及时域响应数值模拟表明,该阻尼器布置方案只需使用很少数量的阻尼器,便可以显著增加较宽频带内所有模态的阻尼比,而且对于其他模态的振动也有一定的抑制作用.
In order to realize the vibration control of the spacecraft instrument mounting plate, a finite element model of the instrument mounting plate made of Kagome sandwich plate was established, and a cylindrical viscoelastic damper was chosen to establish the finite element model of the damper through Biot model The proportion of the modal strain energy of the Kagome plane truss in the total modal strain energy of each mode was calculated and used as modal controllable degree. Combined with the modal displacement for a given load The mode of damper that needs to be controlled is determined, and a damper arrangement scheme using modal strain energy ratio to control multi-mode vibration is proposed.The eigenvalue analysis and numerical simulation of time-domain response show that this damper arrangement only needs to use A small number of dampers can significantly increase the damping ratio of all modalities in a wider frequency band and also have some damping effects on the vibration of other modalities.