摘要
提出了一种结构动力特性修改的新方法,通过在原结构上附加质量与刚度来重新设定结构固有频率,以满足结构设计的动力特性要求。该方法在交叉模型交叉模态(CMCM)模型修正方法基础上进行了改进,仅利用目标频率信息来确定结构质量和刚度的附加量。数值算例采用了一个5自由度的弹簧质量系统,进行了设定结构单阶及多阶固有频率多种工况的计算。数值结果表明:修改后结构的固有频率可以满足给定的频率要求。
This article presents a new modification method for the structural dynamic characteristics. The modification procedure is to reset the natural frequency of the original structure by adding the structural mass and stiffness Upon the completion of the modification, the dynamic characteristics of modified structures is satisfactory accrording to the design requirements The method adopts the cross-model cross-mode （CMCM） method originally developed for model updating, with the complete modal data replaced by the target frequencies. Numerical example is given for a five-degree-of-freedom spring-mass system. Several scenarios are studied including resetting single frequency and muti-frequency. Numerical results indicate the modifaction method is applicable to the modification of structural frequency.
出处
《工程力学》
EI
CSCD
北大核心
2009年第8期10-14,共5页
Engineering Mechanics
基金
国家高技术研究发展计划(863计划)项目(2006AA09Z331)
国家自然科学基金项目(50739004)
关键词
结构动力学
模态分析
结构动力特性修改
固有频率
有限元方法
structural dynamics
modal analysis
structural dynamic characteristics modification
natural frequency
finite element method
