柔性梁内嵌流体减振机理与流体运动能耗分析

Vibration Suppression and Energy Dissipation of Fluid Movement for Flexible Beam with Imbedded Fluid Subsystem

以内嵌流体柔性欧拉梁为研究对象,对其在一、二阶垂直定频激励模式下流体响应进行了数值模拟,揭示了封闭腔内流体在梁扰动下运动的峰特征;合理划分流体区域,研究不同位置流体对梁作用力的时域特征;基于能量耗散的原理,提出流体运动能耗量化准则,从能耗的角度上阐明了内嵌粘性流体单元运动减振的内在机理和有效性,并以此为标准对不同工况下流体运动减振效果进行比较,结果表明相同条件下1/2体积流体运动减振效果要明显优于2/3体积。

Fluid response of a flexible Euler beam with imbedded fluid subsystem under specific vertical stead sinusoidal excitations of first and second order is investigated via numerical simulations to show the peak character of fluid movement. The fluid area is rationally divided, and the forces acting on the beam by fluid at different positions are analyzed. Based on the principle of energy dissipation, a quantitative criterion of energy dissipation is proposed to illustrate the inherent mechanism and effectiveness of reducing vibration due to the movement of interior inlaid viscous fluid unit, and to appraise effects of vibration suppression for fluid moment in different cased, which indicates that damping effect of 1/2 volume gets obviously better than that of 2/3 volume in the same circumstance.