基于齿轮基胞元的动力吸振器设计及船体减振研究

Design of dynamic vibration absorber with gear-based metacell and its research on hull vibration reduction

船体结构在复杂激励下易产生剧烈振动,且传统动力吸振器工作频带较窄,缺乏普遍适用性。基于齿轮基胞元的刚度可调特性,构建一种新型半主动式动力吸振器。利用齿轮基胞元的理论力学模型,推导了单个胞元的刚度解析公式,并结合动力学模型和有限元法,对齿轮基动力吸振器的移频特性和吸振性能展开分析,结果显示新型动力吸振器调频范围广且具有良好的减振效果。经有限元仿真计算,探究了吸振器质量变化对船体减振效果的影响,可为相关减振设计提供有益参考。

Hull vibration under complex excitation poses great harm.Traditional dynamic vibration absorber(DVA)lacks of universal applicability because of its narrow working band.Based on the adjustable stiffness of gear-based metacell,a new type of semi-active DVA was proposed.Using the mechanical model,the analytical formula for calculating the metacell's stiffness was derived.Based on the dynamic model and FEM,the frequency shift characteristics and vibration absorption performance of the gear-based DVA were analyzed.The results show that the DVA has a wide frequency tuning range and a good damping effect.Through the FEM simulation,the influence of the DVA's mass on the damping effect of the ship hull is explored,which can provide a useful reference for the relevant vibration reduction design.