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An Optimization Method for Selecting Physical Modes in Poly-Reference Modal Analysis of Vehicle Systems
Technical Paper
1999-01-1782
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Distinguishing physical modes from mathematical modes in the modal analysis of complex systems, such as full vehicle structures, is a difficult and time-consuming process. The major tools frequently used are stabilization diagrams, mode indicator functions, or modal participation factors. When closely spaced modes are to be identified, the stabilization diagrams and mode indicator functions are no longer effective. Even the reciprocities of mode shapes and modal participation factors cannot be well satisfied to indicate whether a mode is a physical one, when measurement errors are large. To overcome these difficulties, an optimization procedure is developed, whereby physical modes can be sorted out in a given frequency range while the error between measured and synthesized frequency responses is minimized. An optimal subset selection algorithm is used in this procedure. Mode significant values are also introduced to show the relative significance of each mode in contributing to measured frequency responses. This innovative method proves to be effective in aiding the selection of physical modes for full vehicle structures.
Authors
Citation
Wang, D., Nikravesh, P., Kuo, E., Jung, W. et al., "An Optimization Method for Selecting Physical Modes in Poly-Reference Modal Analysis of Vehicle Systems," SAE Technical Paper 1999-01-1782, 1999, https://doi.org/10.4271/1999-01-1782.Also In
References
- Armstrong, R. D. Kung, M. T. An Algorithm to select the best subset for a lest absolute value regression problem Optimization in Statistics, TIMS studies of the Management Sciences 33 931 936 1982
- Barut, A. Wang, D. Madenci, E. Nikravesh, P. E. Multi-Input Direct Parameter Identification Method Department of Aerospace and Mechanical Engineering April 1996
- Ewins, D. J. Modal testing - theory and practice John Wiley & Son 1994
- Lembregts, F. Snoeys, R. Leuridan, J. Application and Evaluation of Multiple-Input Modal-Parameter Estimation Proc. of the 17th Int. Sem. on Modal Analysis 19 31 1992
- Leuridan, J. Van der Auweraer, H. Mergeay, M. Review of Parameter Identification Techniques
- Li, S. Fladung, W. A. Philips, Allyn W. Brown, D. L. Automotive Applications of the Enhanced Mode Indicator Function Parameter Estimation Method 16th IMAC 36 44 Feb. 1998
- Lipkens, J. Leuridan, J. The Use of Modal Participation Factors to Determine Physical Poles Proc. of 11th Int. Sem. On Modal Analysis Katholieke Univ. Leuven 1986