筏架几何参数对隔振系统性能的影响分析

Effect analysis of geometric parameters of floating raft on isolation performance

[目的]为了研究几何参数对浮筏隔振系统性能的影响,[方法]运用参数化建模技术建立筏架的参数化有限元模型,以振级落差作为隔振效果的评价参数。在弹性筏架总质量不变的前提下,分析筏架几何参数对系统隔振性能和筏架固有频率分布的影响。[结果]结果表明:筏架的几何参数对浮筏隔振系统隔振效果的影响主要体现在中、高频段;筏架高度、长宽比、肋板数目是影响浮筏隔振系统隔振性能和筏架固有频率分布最重要的几何参数;调整筏架几何参数是避开机械设备激振频率的有效途径之一。[结论]所得结论对浮筏隔振系统设计具有一定的工程实用价值。

[Objectives] This paper focuses on the effects of the geometric parameters of a floating raft on isolation performance. [Methods] Based on the idea that the weight of a floating raft remains constant, a parametric finite element model is established using geometric parameters, and the effects of the geometric parameters when isolation performance is measured by vibration level difference are discussed. [Results] The effects of the geometric parameters of a floating raft on isolation performance are mainly reflected in the middle and high frequency areas. The most important geometric parameters which have an impact on isolation performance are the raft＇s height, length to width ratio and number of ribs. Adjusting the geometric parameters of the raft is one effective way to avoid the vibration frequency of mechanical equipment. [Conclusions] This paper has some practical value for the engineering design of floating raft isolation systems.