连接界面不定性对筋板结构中频振动的影响  

Interface Uncertainty Effects on the Mid-frequency Vibration of Rib-stiffened Plates

作　　者：纪琳[1] 黄震宇[2] 

机构地区：[1]山东大学机械学院,济南250061 [2]上海交通大学信息与自动化学院,上海210014

出　　处：《振动．测试与诊断》2014年第4期714-719,780-781,共6页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51175300);山东省自然科学基金资助项目(ZR2011EEM009)

摘　　要：以一个具有典型中频振动特征的简单梁板组合结构为例,讨论了连接界面不定性对于工程中常用的筋板类结构振动响应的主要影响特征以及对于中频混合模型法(hybrid FE/SEA method)的计算有效性与准确性的一般影响规律。分析表明:连接界面自由度数目不确定性的影响比连接界面位置的不确定性的影响更为显著,尤其是当界面自由度数目较少的情况下,随着筋板间的动态特性差异的增大,连接界面不定性的影响逐渐增强。采用中频混合模型法进行计算时应尽量减小连接界面自由度数目的不确定性,这对于梁板间具有较大动态特性差异的筋板组合结构的中频振动响应的准确预测来说显得尤为重要。A simple beam-plate model is set up whose dynamic deformations are characterized by typical mid-frequency vibration behavior.The interface uncertainty effects on the vibro-acoustic response of the rib-stiffened plate system are then investigated numerically based on the beam-plate model in the first instance.It is found that the uncertainty in the number of interface degrees of freedom(DOFs)can generate more significant dynamic effects on the built-up system than on the interface locations.The effects of the interface uncertainty increase as the dynamic mismatch between the beam and plate increases.This suggests that in the case of large dynamic mismatch between ribs and plates,the uncertainty problems in the number of interface DOFs should be avoided as much as possible in order to improve the accuracy and validity of the hybrid FE/SEA method.

关 键 词：中频振动 长波子系统 短波子系统 筋板组合结构 混合模型法 

分 类 号：TB53[理学—物理] O32[理学—声学]