Vibration reanalysis using frequency-shift combined approximations

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• 作者：1. Department of Mechanics ; College of Mechanical Science and Engineering ; Jilin University ; Changchun ; 130022 People’s Republic of China2. State Key Laboratory of Automotive Dynamic Simulation ; Jilin University ; Changchun ; 130022 People’s Republic of China
• 关键词：Frequency ; shift combined approximations – Vibration reanalysis – Approximate analysis – Eigenproblem reanalysis
• 刊名：Structural and Multidisciplinary Optimization
• 出版年：2011
• 出版时间：August 2011
• 年：2011
• 卷：44
• 期：2
• 页码：235-246
• 全文大小：425.8 KB
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• 作者单位：http://www.springerlink.com/content/nq1230r52x353381/
• 刊物类别：Engineering
• 刊物主题：Theoretical and Applied Mechanics
  Computer-Aided Engineering and Design
  Numerical and Computational Methods in Engineering
  Engineering Design
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1615-1488

文摘

In the structural dynamic optimization procedure, many repeated analyses are conducted to evaluate vibration performance of successively modified structural designs. A new procedure for structural vibration (or eigenproblem) reanalysis is developed based on iteration and inverse iteration method with frequency-shift and linear combination acceleration to reduce the high computational cost of structure reanalysis. With a suitable frequency-shift factor, the Frequency-Shift Combined Approximations (FSCA) method allows to calculate higher modes accurately. Three numerical examples are presented to demonstrate the accuracy of the proposed method. Excellent results can be obtained in cases where large modifications are made and higher modes are needed.