【作者】 何建军； 姜节胜；

【Author】 He Jian-jun, Jiang Jie-sheng (.Institute of Vibration Engineering, Northwestern Polytechnical University, Xi’an 710072, China)

【机构】 西北工业大学振动工程研究所；

【摘要】 本文针对自由度增加的结构拓扑修改情况,基于初始结构的三次缩聚模型和拓扑修改结构的降阶模型,采用新增加自由度上的独立质量正交化处理和瑞利-里兹(Rayleigh-Ritz)分析,并进一步结合整个缩聚模型自由度上的瑞利-里兹分析,提出了一种改进的近似特征值重分析方法。数值算例结果表明,所提出的方法是结构拓扑修改时特征值重分析的高效、高精度的方法。更多还原

【Abstract】 The paper presents a new improved method for structural eigenvalue reanalysis with large change in structure topology possessing added degrees of freedom(DOF). The method,which is based on the third reduced model of original structure and condensated model topological structure, combines independent mass orthogonality and Rayleigh-Ritz analysis corresponding to the newly added DOF. And then, the approximate eigenvalues of topological modified structure are further improved by Rayleigh-Ritz analysis corresponding to the whole DOF of condensated model. Two numerical examples were used to show that the presented method can provide efficient and high quality approximation result for eigenvalues reanalysis when large modifications of the structural topology are made.更多还原