This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Vehicle Interior Noise and Vibration Reduction Method Using Transfer Function of Body Structure
Technical Paper
2011-01-1692
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
To reduce interior noise effectively in the vehicle body structure development process, noise and vibration engineers have to first identify the portions of the body that have high sensitivity. Second, the necessary vibration characteristics of each portion must be determined, and third, the appropriate body structure for achieving the target performance of the vehicle must be realized within a short development timeframe.
This paper proposes a new method based on the substructure synthesis method which is effective up to 200Hz. This method primarily utilizes equations expressing the relationship between driving point inertance change at arbitrary body portions and the corresponding sound pressure level (SPL) variation at the occupant's ear positions under external force. A modified system equation was derived from the body transfer functions and equation of motion by adding a virtual dynamic stiffness expression into the dynamic stiffness matrix of the vehicle. It is possible to calculate the sensitivities of hundreds of body portions automatically by incorporating the modified equation into an application program. Thus, a sensitivity table report that enables a comprehensive extraction of high sensitivity body portions, directions, and frequency ranges can be prepared.
The next step is to find feasible solutions of body modifications to achieve the target interior noise SPL. For this, the objective ranges of the desirable driving point inertance levels and phases for each extracted sensitive body portion are calculated at each frequency within the designated range by utilizing a transformed equation based on the modified equation. Once the necessary ranges are determined, body structure modifications can be investigated more efficiently with mechanical engineering knowledge such as resonance frequency shifts and so on.
This method was applied to both a Finite Element trimmed body model and a physical vehicle body for engine booming noise. The results validated the effectiveness of these methods.
Recommended Content
Authors
Citation
Yamamoto, S., Kobayashi, N., and Yamaoka, H., "Vehicle Interior Noise and Vibration Reduction Method Using Transfer Function of Body Structure," SAE Technical Paper 2011-01-1692, 2011, https://doi.org/10.4271/2011-01-1692.Also In
References
- Crowley, John R. etal “A comparison of SMURF and modal modeling” Proceeding of the 3rd IMAC 1053 1059 1985
- Noguchi, Hisanori Terui, Ichiro Urushiyama, Yuta Tobita, Tetsuo “Sensitivity analysis using frequency respoinse function” Journal of Society of Automotive Engineers of Japan 41 13 1528 1531 1987
- Tsurumi, Y. Yamakawa, H. et al. “Optimization for vibration reduction in final phase of automotive body structural design” Proceedings of DETC'01 ASME 2001 Design Engineering Technical Conference and Computers Information in Engineering Conference 2001
- Arakawa, Masashi Suzuki, Ichiro Yamaoka, Hiroo “Development of transmitted energy path for interior noise reduction on vehicle” 2006 JSAE Annual Congress (Spring), Proceedings No.55-06 13 16 2006
- Suzuki, Ichiro Arakawa, Masashi Yamaoka, Hiroo “Development of body structure analysis technique for interior noise reduction on vehicle by vibration energy” 2007 JSAE Annual Congress (Spring), Proceedings No.40-07 15 18 2007