结构动力有限元分析的阻尼建模及评价  

DAMPING MODELING AND ITS EVALUATION IN ENGINEERING STRUCTURE DYNAMICAL ANALYSIS BY FINITE ELEMENT METHOD

作　　者：淡丹辉[1] 孙利民[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《振动与冲击》2007年第2期121-123,137,共4页Journal of Vibration and Shock

基　　金：国家973项目2002CB412709资助;教育部高等学校科技创新工程重大项目培育资金项目资助;国家自然科学基金资助(项目批准号:50678123)

摘　　要：提出一种统一的阻尼模型的定量评价方法和评价指标,设计一套用于评价各种阻尼模型的标准测试案例。分析工程结构动力学建模过程中几种已有的阻尼模型和一种新的阻尼模型———单元化阻尼比法,给出其各自的程序实现。通过标准测试案例的数值测试,比较这些阻尼建模法的性能差异。结果表明,阻尼特性单元化比总体考虑的阻尼特性更趋合理,而单元化阻尼比法则在控制结构总体模态阻尼比方面具有优势。A uniform evaluation method and evaluation index for various kinds of damping models are proposed.A standard test case is designed for evaluation.Several existent damping modeling methods and a new elemental damping ratio method used in the process of engineering structure dynamical analysis are compared and programmed.A standard example is designed to give all the models an impartialtest.Numerical tests on the standard test case show that elemental damping property is more reasonable than that of integral considerations,while the elemental damping ratio model performs well in controlling the precision of damping ratio and in acclimatizing itself to non-classical damping situations or complex damping cases.

关 键 词：结构动力分析 阻尼模型 单元阻尼特性 整体阻尼特性 

分 类 号：P315.6[天文地球—地震学]