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Multishaker Broadband Excitation for Experimental Modal Analysis
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English
Abstract
A new method of excitation for modal testing is described which combines the benefits of the two most often used techniques: multipoint sine dwell and single-point random. This new method--multishaker broadband excitation--employs an array of shakers to develop multiple sets of frequency response functions, which, as evidenced by their reciprocity and consistency, yield a more accurate representation of the structure's dynamics, resulting in a better modal model. Additionally, this new technology offers a significant reduction in time required to perform a modal survey. An example application to the space shuttle orbiter Enterprise is described.
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Authors
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Citation
Hunt, D. and Peterson, E., "Multishaker Broadband Excitation for Experimental Modal Analysis," SAE Technical Paper 831435, 1983, https://doi.org/10.4271/831435.Also In
References
- Chen, J.D. Galileo Modal Test Los Angeles IES Modal Analysis Seminar March 1983
- Bendat, J.S. Piersol A.G. “Engineering Applications of Correlation and Spectral Analysis,” 1980
- Allemang, R. “Investigation of Some Multiple Input/Output Frequency Response Function Experimental Modal Analysis Techniques,” Ph.D. dissertation Department of Mechanical and Industrial Engineering, University of Cincinnati 1980 281
- Allemang, R.J. Rost R.W. Brown D.L. “Dual Input Estimation of Frequency Response Functions for Automotive Structures,” SAE Paper 820193 February 1982
- Peterson, E.L. “Evaluation of a Multi-Shaker Uncorrected Random for Experimental Analysis Performed on the Space Shuttle 0V101 (Enterprise),” Project Final Report No. 11358, performed for NASA LBJ Space Center February 28 1983
- Void, H. Kundrat J. Rocklin G.T. Russell R. “A Multi-Input Modal Estimation Algorithm for Mini-Computers,” SAE Paper 820194 February 1982
- Void, H. Rocklin G.T. “The Numerical Implementation of a Multi-Input Modal Estimation Method for Mini-Computers,” International Modal Analysis Conference Proceedings November 1982
- User Manual for MODAL-PLUS 7.0 SDRC 1982