Abstract:

Formulas on calculating power flow level difference by finite element method are presented for mechanical structures like isolator, beam, plate and combined parts. Through the computations on finite element power flow level difference and vibration level difference for the combined structure, the merits of these two kinds of evaluation methods arecompared. Computational results show that synthetic considering of vibration level difference and power flow level difference in design can get more feasible reduction effects.

Key words: vibration and wave, power flow level difference, vibration level difference, finite element power flow, combined structures

摘要：

给出基于有限元法的各种力学构件如隔振器、梁、板及其组合结构有限元功率流计算公式。通过对板梁组合结构有限元功率流落差与振级落差计算，研究两种评价方法的优缺点。研究表明，减振设计中应综合关注振级落差与功率流落差，协调降低，这样才能获得较佳的系统减振效果。

关键词: 振动与波, 功率流落差, 振级落差, 有限元功率流, 组合结构