Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
권호 표지
DOI QR코드

DOI QR Code

Study on the Characteristics of a Dash System Based on Test and Simulation for Vehicle Noise Reduction

승용차량의 소음저감을 위한 시험과 시뮬레이션을 이용한 대시 시스템의 특성 연구

  • Yoo, Ji Woo (Noise and Vibration CAE Team, Hyundai Motor Company) ;
  • Chae, Ki-Sang (Noise and Vibration CAE Team, Hyundai Motor Company) ;
  • Cho, Jin Ho (R&D Center, NVH Korea)
  • Received : 2012.06.15
  • Accepted : 2012.10.05
  • Published : 2012.11.20
Download PDF
⟨ Previous Next ⟩

Abstract

Low frequency noises(up to about 200 Hz) such as booming are mainly caused by particular modes, and in general the solutions may be found based on mode controls where conventional methods such as FEM can be used. However, at higher frequencies between 0.3~1 kHz, as the number of modes rapidly increases, radiation characteristics from structures, performances of damping sheets and sound packages may be more crucial rather than particular modes, and consequently the conventional FEM may be less practical in dealing with this kinds of structure-borne problems. In this context, so-called 'mid-frequency simulation model' based on FE-SEA hybrid method is studied and validated to reduce noise in this frequency region. Energy transmission loss(i.e. air borne noise) is also studied. A dash panel component is chosen for this study, which is an important path that transmits both structure-borne and air borne energies into the cavity. Design modifications including structural modifications, attachment of damping sheets and application of different sound packages are taken into account and the corresponding noise characteristics are experimentally identified. It is found that the dash member behaves as a noise path. The damping sheet and sound packages have similar influences on both sound radiation and transmission loss. The comparison between experiments and simulations shows that this model could be used to predict the tendency of noise improvement.

Keywords

References

  1. Kim, K.-C., Kim, C.-M. and Kim, J.-T., 2010, Study on the Prediction Technique of Vehicle Performance using Parameter Analysis, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 20, No. 11, pp. 995-1000. https://doi.org/10.5050/KSNVE.2010.20.11.995
  2. Lim, C., Yoo, J. W., Park, C.-M. and Cho, J. H., 2010, Study on Acoustical Radiation from Simplified Systems of a Dash Structure for NVH Performance, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 20, No. 10, pp. 931-939. https://doi.org/10.5050/KSNVE.2010.20.10.931
  3. Yoo, J. W., Chae, K.-S. and Park, C.-M., 2007, Development and Application of Mid-frequency Analysis for the Improvement of Noise and Vibration of Automotive Vehicles (1) (in Korean), Journal of KSNVE, Vol. 17, No. 6, pp. 44-51.
  4. Yoo, J. W., Chae, K.-S., Park, C.-M., Suh, J. K. and Lee, K. Y., 2012, Evaluation of Design Variables to Improve Sound Radiation and Transmission Loss Performances of a Dash Panel Component of an Automotive Vehicle, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 22, No. 1, pp. 22-28. https://doi.org/10.5050/KSNVE.2012.22.1.022
  5. Chae, K.-S., Park, C.-M. and Yoo, J. W., 2010, Simulation of Mid- and High-frequency Vehicle Interior Noise, Proceedings of the Acoustical Society of Korea Autumn Conference, pp. 41-45.
  6. Putner, J., Fastl, H., Lohrmann, M. Kaltenhauser, A. and Ullrich, F., 2012, Operational Transfer Path Analysis Predicting Contributions to the Vehicle Interior Noise for Different Excitations from the Same Sound Source, Proceedings of Inter-noise, No. 389.
  7. Chae, K.-S., 2011, Simulation Reliability Study on Air Borne Noise due to Various Driving Conditions, HMC Internal Report, YLAA-TECH-10-054.
  8. Bies, D. A. and Hansen, C. H., 1996, Engineering Noise Control, E& FN Spon, London.
  9. Biot, M. A., 1956, Theory of Propagation of Elastic Waves in a Fluid-saturated Porous Solid-higher Frequency Range, Journal of Acoustical Society of America, Vol. 28, No. 2, pp. 179-191. https://doi.org/10.1121/1.1908241
  10. VA One, User's Manual, 2010.