梁结构破损诊断的振动功率流特性  

Vibrational power flow analysis and diagnosis of damaged beam structures

作　　者：李天匀[1] 刘土光[1] 刘理[1] 

机构地区：[1]华中理工大学交通学,武汉430074

出　　处：《声学学报》1999年第2期143-148,共6页Acta Acustica

基　　金：上海交通大学海洋工程国家重点实验室开放基金;湖北省自然科学基金

摘　　要：从结构噪声的观点，利用振动功率流方法对梁结构破损诊断进行了研究。推导了梁单元场迁移矩阵和破损部位的点迁移矩阵，结合周期结构理论，计算了传递功率流与破损位置及其特征尺寸的关系，从而可进行有效的破损诊断．与传统的方法相比，本文方法在结构噪声领域具有较大的工程应用价值。In the view of structure-borne sound, a diagnosis method for the detection and location ofdamage of beam structures by means of vibrational power flow is investigated. Damages in a structurecause changes in the physical coefficients of mass density, elastic modulus and damping coefficients. Inthis paper) the damage is modeled as a joint of a local spring. The damage point transfer matrix and thebeam element transfer matrix are deduced, then the relations of the vibrational power flow, the positionand the characteristic size of the damage are obtained combined with periodic structure theory. Thedamage can be diagnosed by comparing the vibrational power flow of beam structures with and withouta damage. The approach presented here can sense the presence of damage, and locate and characterizethe damage to a satisfactory precision.

关 键 词：梁结构 结构噪声 破损诊断 振动功率流 

分 类 号：TB302.5[一般工业技术—材料科学与工程] O421.5[理学—声学]