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Practical Considerations of Vehicle Noise and Vibration Simulation Using an Improved Dynamic Impedance Method
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English
Abstract
The design of automotive components for low structure-borne interior noise and vibration is facilitated by the ability to reliably simulate total vehicle system response over a wide operating frequency range. This requires that the car body, its interior acoustic cavity, and critical chassis components must be included in the overall dynamic model. Unfortunately, most noise and vibration problems occur in the 200-1000 Hz frequency range where finite element and experimental modal methods have limited applicability. This is due to the high modal density, high damping levels, and sensitivity to fine geometric detail. A simulation method has been proposed earlier which uses component finite element models and component experimental transfer functions to predict combined system response [1]. This method has allowed for a practical approach to automotive system noise and vibration simulation.
In this paper, a discussion of various practical concerns in the implementation of the SMART (System Modelling and Analysis using the Response Technique) is presented. A comparison will be made to the approximate system response using the blocked force method, which is sometimes referred to as the Complex Vector method. Insight will be provided to proper model configuration and implementation of Singular Value Decomposition (SVD) filtering using the SMART algorithm. A discussion of potential applications where the approximate Complex Vector method may provide a more accurate prediction than the full SMART algorithm is also provided.
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Citation
Steyer, G. and Lim, T., "Practical Considerations of Vehicle Noise and Vibration Simulation Using an Improved Dynamic Impedance Method," SAE Technical Paper 931313, 1993, https://doi.org/10.4271/931313.Also In
References
- Lim T.C. Steyer G.C. “Hybrid Experimental-Analytical Simulation of Structure-borne Noise and Vibration Problems in Automotive Systems,” SAE International Congress and Exposition Paper Number 920408 Detroit, Michigan 1992
- Lim T.C. Steyer G.C. “An Improved Numerical Procedure for the Coupling of Dynamic Components Using Frequency Response Functions,” Proceedings of the 9nd International Modal Analysis Conference 902 908 1991
- Lim T.C. Steyer G.C. “System Dynamics Simulation based on Structural Modification Analysis using Response Techniques,” Proceedings of the 10th International Modal Analysis Conference 1153 1158 1992
- Matsui T. Suzuki K. Mori K. Steyer G. “An Improved Dynamic Impedance Method for Dynamic Analysis of a Vehicle” SAE Noise and Vibration Conference Paper Number 931314 Traverse City, Michigan 1993
- Leuridan J. De Vis D. Grangier H. Aquilina R. “Coupling of Structures Using Measured FRF's: Some Improved Techniques,” Proceedings of the 13th International Seminar on Modal Analysis 1988