摘要
本文提出一种用于计算结构固有振动特性的杂交子结构法,兼有固定界面和自由界面模综术的优点:通过在子结构的界面上施加一组拘束,以消除当分划系统时可能产生的悬浮部件以及为多于两个子结构所共占的超对接自由度;用保留的自由界面主模态和剩余模态来描述每个约束子结构的运动;利用定义于拘束集上的约束模态释放所施加的拘束,使计及全体删除主模态柔度的剩余模态的计算得到简化,并易于系统的装配;最终坐标是约束模态坐标加每个约束子结构的主模态坐标。这种方法在理论上具有更高的综合率。
A hybrid dynamic substructure technique is presented for calculating the na-tural vibration characteristics of undamped structures. It has the advantages ofboth the fixed-interface and free-interface modal syntheses. A selected set of res-traints are imposed on substructure interfaces to avoid free-free substructures orredundant interface degrees of freedom shared by more than two substructures.The motion of each substructure is described by the reserved free-interface normalmodes and the residual modes. Previously imposed restraints are released with theconstraint modes defined on the above-mentioned set of restraints. Consequently,this technique simplifies the evaluation of the residual modes Which represent theflexibility of all the deleted normal modes and facilitates final system assembly.The coordinates in final synthesis are constraint modal coordinates plus normalmodal coordinates of all constrained substructures. In principle, this method hashigher computational efficiency.
出处
《复旦学报（自然科学版）》
CAS
CSCD
北大核心
1989年第4期448-452,共5页
Journal of Fudan University：Natural Science
基金
机械工业技术发展基金
关键词
结构
振动特性
子结构法
模态综合
substructure method
modal synthesis
connection coordinate.
