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Mode Based Prediction of Vibrations in Complex Automotive Structures, A Review of Shortcomings
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 16, 2005 by SAE International in United States
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Noise, vibration and harshness (NVH) comfort in automotive and other transportation vehicles is becoming increasingly important for customers and passengers and thus also for manufacturers. Accurate numerical prediction methods are thus of great practical interest, especially for designs where high damping materials or multilayer treatments are included. Traditionally, mode based techniques are used for prediction of vibrations in automotive structures. This is motivated by the possibility of using reduced modal models instead of very detailed FE models. Unfortunately, for highly damped structures, the effect of reduced model size on the accuracy of predicted NVH response levels is often not known.
In this paper, conventional modal vibration theory, along with two simple damped Oberst beam examples, are used to highlight problems with the application of modal methods towards highly damped materials, systems and multilayer treatments.
CitationDovstam, K., Göransson, P., and Semeniuk, B., "Mode Based Prediction of Vibrations in Complex Automotive Structures, A Review of Shortcomings," SAE Technical Paper 2005-01-2343, 2005, https://doi.org/10.4271/2005-01-2343.
- Gartmeier, O. 2003 Noise and vibration in vehicle comfort design - A practitioners view point Proceedings of the Tenth International Congress on Sound and Vibration Stockholm, Sweden 7-10 July 2003
- PERMAS 2004 Finite Elements in Engineering Applications Proceedings of the Seventh PERMAS Users' Conference Stuttgart, Germany 2004
- Semeniuk, B. Göransson, P. Guastavino, R. Dovstam, K. 2003 Engineering modeling and simulation of noise and vibrations: physical modeling of multi-layer structures Proceedings of the Tenth International Congress on Sound and Vibration Stockholm, Sweden 7-10 July 2003
- Dovstam, K. 2000 Simulation of damped vibrations based on augmented Hooke's law and elastic modes of vibration Int. J. Solids Structures 37 5413 5445 2000
- Dovstam, K. 2000 Augmented Hooke's law based on alternative stress relaxation models Computational Mechanics 26 1 90 103 2000
- Dovstam, K. 2000 Simulation of material damping based on constitutive stress relaxation models Proceedings of ISMA 25, the International Conference on NOISE and VIBRATION Engineering Leuven, Belgium 13-15 September 2000
- ASCE Seismic Analysis of Safety-Related Nuclear Structures and Commentary American Society of Civil Engineers
- ASME 1998 Boiler & Vessel Code, III, Division 1 - Appendices, Appendix N Dynamic analysis methods
- Ewins, D. J. 1986 Modal testing: theory and practice Research Studies Press Ltd., Letchworth, England Special printing for Brüel & Kjaer Naerum, Denmark
- Dovstam, K. 1998 Real modes of vibration and hybrid modal analysis Computational Mechanics 21 6 493 511 1998
- Dalenbring, M. 2002 Experimental material damping estimation for planar isotropic laminate structures International Journal of Solids and Structures Volume 39 Issue 19 September 2002 Pages 5053 5079
- Cook, R. D. Malkus, D. S. Plesha, M. E. Witt, R.J. 2002 Concepts and applications of finite element analysis Fourth Edition John Wiley & Sons 2002
- Dovstam, K. 1997 Receptance model based on isotropic damping functions and elastic displacement modes Int. J. Solids Structures 34 21 2733 2754