基于柔度修正的局部刚体化结构动力模型简化方法  

A MODEL REDUCTION METHOD FOR DYNAMIC ANALYSIS BASED ON QUASI-RIGID-BODY MODE AND FLEXIBILITY MODIFICATION

作　　者：刘彬[1] 丁桦[1] 时忠民[2] 

机构地区：[1]中国科学院力学研究所工程科学部,北京100080 [2]中国海洋石油总公司研究中心,北京100027

出　　处：《工程力学》2007年第10期25-29,35,共6页Engineering Mechanics

摘　　要：提出一种基于柔度修正的局部刚体化结构动力模型简化方法。以复杂工程结构的有限元模型为基础,根据运动同步性假设将结构分成若干同步性区域,对每个区域引入准刚体模态,实现对结构的简化。同时对简化方法进行误差分析,利用柔度修正的思路实现对简化变化矩阵的修正,得到更精确的简化结果。以海洋平台结构作为算例应用该方法,得到了比较满意的简化结果。A new model reduction method for dynamic analysis of complex structures based on Quasi-Rigid-Body Mode and Flexibility Modification is presented. The complex structures can be divided into several displacement synchronous parts by analyzing the finite element models based on the synchronistic assumption. Every synchronous part can be substituted by a quasi-rigid-body mode that is considered the extremum of the synchronous assumption, with which the full-size models can be reduced. According to the error analysis of the reduction process, the reduction model is updated by optimizing the transformation matrix based on flexibility modification and an accurate reduction model is obtained. As an example, an offshore jacket platform is presented to show the efficiency of the proposed method. And the result of the reduction model satisfies the precision requirement.

关 键 词：模型简化 同步性 模型修正 准刚体模态 误差分析 

分 类 号：TU318[建筑科学—结构工程]