摘要
本文概述了结构动力学中模态重分析的理论与方法的发展,并讨论了特征问题重分析的导纳法和假设模态法。基于重分析的理论,提出并发展了导管架平台特征问题重分析的专用程序ERP,该程序可以方便地与其它通用有限元分析程序,特别是与SAP5相结合。某海洋平台模型的典例考核表明,本文所提出的方法具有快速、准确的特点,对于海洋平台结构的局部或整体性变化,计算效率可提高20倍至50倍左右。该技术可实现设计综合与修改,还可以用于结构故障所导致的数学模型变化和特征值变化的快速预报和破坏或损伤模式的辅助诊断。
This paper reviews the development of the thneory and methodlogy for dynamicreanalysis and discusses the assumed mode approach and receptance approach in detail. Based on above method,an eigenproblem reanalysis program(ERP)has been developed,which can be implementéd convertiently with a general purpose finite element analysis program,espeeially,it is readily embedded in SAP5. The numerical results of the offshore platform and othet typical examples show that the new algorithm is of high preeision and effecieney.In Case of local modification in the offshore platform model,the efficieney is raised by 20-50 times when compared with recalculation of the whole model. This technique may be used iparameter synthesis and modification in structlura optimization design,or as a diagnostic tool in fast forecast of the eigenvalue hewn the model is changed due to structure damages.
出处
《海洋工程》
CSCD
北大核心
1993年第1期12-17,共6页
The Ocean Engineering
