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High structural damping based on the internal snap-buckling mechanism of a continuous metal module
Mechanics Research Communications ( IF 2.4 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.mechrescom.2020.103514
Dejian Li , Hui Fang , Liya Duan

Abstract A structural module that can bear load and dissipate dynamic energy effectively is desirable. In this paper, a continuous laminated metal module of a preloaded beam bimorph and elastic layer is developed to achieve versatility of damping properties based on internal snap-buckling mechanism. According to nonlinear Euler-Bernoulli beam theory, the dynamic model of this structure can be obtained. Multiple scales method is utilized to derive intra- and inter-well vibratory responses analytically. Based on numerical simulations, this continuous module would have a negative stiffness due to internal snap-buckling behavior in the inter-well oscillation, while the macroscopic displacement remains fixed, which brings about orders of magnitude of energy dissipation within a certain bandwidth. Numerical results demonstrate the essential role that the shape of the function of potential energy plays, in conjunction with the excitation, to determine whether this module can achieve high dissipation. Analytical functions that can be utilized to determine the loci of critical bifurcations are derived to approximate the effective bandwidth for high dissipation oscillation. For the structures with shallow and closely separated potential wells, the snap-buckling dynamics can occur easily within a considerable bandwidth, even if the system is excited with small amplitudes.

中文翻译:

基于连续金属模块内部卡扣机制的高结构阻尼

摘要 需要一种能够有效承受载荷和消散动能的结构模块。在本文中,开发了一种预加载梁双压电晶片和弹性层的连续层压金属模块,以实现基于内部卡扣屈曲机制的阻尼特性的多功能性。根据非线性欧拉-伯努利梁理论,可以得到该结构的动力学模型。多尺度方法用于分析地推导出井内和井间振动响应。基于数值模拟,由于井间振荡中的内部扣压行为,该连续模块将具有负刚度,而宏观位移保持固定,这会在一定带宽内产生数量级的能量耗散。数值结果表明,势能函数的形状与激励相结合,对于确定该模块是否能够实现高耗散起着至关重要的作用。可用于确定临界分岔轨迹的分析函数被推导出来近似高耗散振荡的有效带宽。对于具有浅层和紧密分离的势阱的结构,即使系统以小振幅激发,也很容易在相当大的带宽内发生快速屈曲动力学。可用于确定临界分岔轨迹的分析函数被推导出来近似高耗散振荡的有效带宽。对于具有浅层和紧密分离的势阱的结构,即使系统以小振幅激发,也很容易在相当大的带宽内发生快速屈曲动力学。可用于确定临界分岔轨迹的分析函数被推导出来近似高耗散振荡的有效带宽。对于具有浅层和紧密分离的势阱的结构,即使系统以小振幅激发,也很容易在相当大的带宽内发生快速屈曲动力学。
更新日期:2020-04-01
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