摘要
针对工程结构动力学建模过程中几种已有的阻尼模型的不足,提出了一种基于模态阻尼比的单元阻尼建模法,以实现对具有分布式阻尼特性的复杂工程结构的精准动力建模,并提出了一种统一的阻尼模型的定量评价方法和评价指标。通过标准测试案例的数值测试,比较了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,适用于非经典和复杂阻尼情形。
Considering the deficiency of several existing damping modeling methods in engineering structures,a damping model based on elemental damping ratio is presented,which aims to improve the precision of the damping model of complicated engineering structures with distributed damping.A unified evaluation method and an evaluation index for various kinds of damping models were proposed,and a standard test case was designed for the evaluation.By numerical tests for a standard test designed in this paper,the performances of these damping models were compared.It shows that the elemental damping property is more reasonable than that of integral considerations,and the elemental damping ratio model performs well in controlling the precision of damping ratio and in adapting itself to non-classical or complicated damping cases.
出处
《振动．测试与诊断》
EI
CSCD
2008年第2期100-103,共4页
Journal of Vibration,Measurement & Diagnosis
基金
国家"八六三"资助项目(编号:2006AA112120)
教育部高等学校科技创新工程重大项目培育资金资助项目
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
模态阻尼比
structural dynamical analysis damping model elemental damping property collectivity damping property modal damping ratio
