This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Efficient Design Studies Using Eigensolution Reanalysis
Annotation ability available
Sector:
Language:
English
Abstract
The design of complex products such as automobiles and aircraft often requires performing repeated dynamic analyses using detailed finite element models. The high computational costs and long turnaround times associated with the use of these models can impede the design process.
In this paper, a practical method for performing efficient design parameter studies using Eigensolution Reanalysis is discussed. Special purpose software has been developed which interfaces with commercial finite element analysis codes. The special purpose software uses the baseline modes to calculate new modes for each design change. The software can also compute forced response of the modified designs given user specified dynamic load cases.
This method provides dramatic savings in CPU time compared to the traditional method of re-solving the full eigenproblem for the modified design modes. Typically, the reanalysis calculations use less than five percent of the CPU time required for the baseline analysis. This means that the design parameter study may now become an interactive activity, thus reducing the required engineering time significantly.
Authors
Citation
Winterer, S. and Bretl, J., "Efficient Design Studies Using Eigensolution Reanalysis," SAE Technical Paper 931297, 1993, https://doi.org/10.4271/931297.Also In
References
- Fox R.L. Kapoor M.P. “Rates of Changes of Eigenvalues and Eigenvectors” AIAA 6 12 Dec. 1968
- Rogers L.C. “Derivatives of Eigenvalues and Eigenvectors” AIAA 8 5 May 1970
- Chen J.C. Wada B.K. “Matrix Perturbation for Structural Analysis” AIAA 15 8 Aug. 1977
- Wang B.P. Chu F.H. “Effective Dynamic Reanalysis of Large Structures” The Shock and Vibration Bulletin, Bulletin 51 May 1981
- Wang B.P. Pilkey W.D. Palazzolo A.R. “Reanalysis, Modal Synthesis and Dynamic Design” State-of-the-Art Surveys on Finite Element Technology Noor A.K. Pilkey W.D. ASME 1983
- Conti P. Winterer S. “Eigensolution Reanalysis using a Modal Reduction Procedure” Proceedings of the 10th International Modal Analysis Conference 1089 1094 1992
- I-DEAS User's Manual Structural Dynamics Research Corporation Milford, Ohio
- MSC/NASTRAN User's Manual MacNeal-Schwendler Corporation Los Angeles, California