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

  • 제26권7호
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  • Pages.765-773
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  • 2016
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  • 1598-2785(pISSN)
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  • 2287-5476(eISSN)
한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
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파수-주파수 분석을 이용한 자동차 옆 창문 표면 압력 섭동의 비압축성/압축성 성분 분해

Decomposition of Surface Pressure Fluctuations on Vehicle Side Window into Incompressible/compressible Ones Using Wavenumber-frequency Analysis

  • Lee, Songjune (School of Mechanical Engineering, Pusan National University) ;
  • Cheong, Cheolung (School of Mechanical Engineering, Pusan National University)
  • 투고 : 2016.07.07
  • 심사 : 2016.11.04
  • 발행 : 2016.12.20
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초록

The vehicle interior noise caused by exterior fluid flow field is one of critical issues for product developers in a design stage. Especially, turbulence and vortex flow around A-pillar and side mirror affect vehicle interior noise through a side window. The reliable numerical prediction of the noise in a vehicle cabin due to exterior flow requires distinguishing between the aerodynamic (incompressible) and the acoustic (compressible) surface pressures as well as accurate computation of surface pressure due to this flow, since the transmission characteristics of incompressible and compressible pressure waves are quite different from each other. In this paper, effective signal processing technique is proposed to separate them. First, the exterior flow field is computed by applying computational aeroacoustics techniques based on the Lattice Boltzmann method. Then, the wavenumber-frequency analysis is performed for the time-space pressure signals in order to characterize pressure fluctuations on the surface of a vehicle side window. The wavenumber-frequency diagrams of the power spectral density shows clearly two distinct regions corresponding to the hydrodynamic and the acoustic components of the surface pressure fluctuations. Lastly, decomposition of surface pressure fluctuation into incompressible and compressible ones is successfully accomplished by taking the inverse Fourier transform on the wavenumber-frequency diagrams.

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참고문헌

  1. Lee, S. and Kim, J., 1997, Aerodynamic Noise in Automobiles, Journal of the Korean Society of Automotive Engineers, Vol. 19, No. 2, pp. 17-24.
  2. Hartmann, M., et al., 2012, Wind Noise Caused by the Side-mirror and A-pillar of a Generic Vehicle Model, 18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference).
  3. Jeong, C. et al., 2014, Predicting Noise Inside a Trimmed Cavity due to Extrior Flow, Proceedings of the KSNVE Annual Spring Conference, pp. 466-471.
  4. Blanchet, D. and Golota, A., 2014, Combining CFD/FEM/BEM/SEA to Predict Interior Vehicle Wind Noise - Validation Case CAA German Working Group, Proceedings of the KSNVE Annual Autumn Conference, pp. 800-811.
  5. Perot, F. et al., 2010, Direct Aeroacoustics Predictions of a Low Speed Axial Fan, 16th AIAA/CEAS Aeroacoustics Conference, AIAA 2010-3887
  6. Li, X. M. et al., 2006, One-step Aeroacoustics Simulation Using Lattice Boltzmann Method, AIAA Journal, Vol. 44, No. 1, pp. 78-89. https://doi.org/10.2514/1.15993
  7. Chen, S. and Doolen, G. D., 1998, Lattice Boltzmann Method for Fluid Flows, Annual Review of Fluid Mechanics, pp. 329-364.
  8. Broadwell, J. E., 1964, Study of Rarefied Shear Flow by the Discrete Velocity Method, Journal of Fluid Mechanics, Vol. 19, No. 3, pp. 401-414. https://doi.org/10.1017/S0022112064000817
  9. Frisch, U. et al., 1986, Lattice-gas Automata for the Navier-Stokes Equation, Physical Review Letters Vol. 56, pp. 1505-1508. https://doi.org/10.1103/PhysRevLett.56.1505
  10. GR, M. and G., Z., 1988, Use of the Boltzmann Equation to Simulate Lattice Gas Automata, Physical Review Letters, Vol. 61, pp. 2332-2335. https://doi.org/10.1103/PhysRevLett.61.2332
  11. Bhatnagar, P. L. et al., 1954, A Model for Collision Processes in Gases. I. Small Amplitude Processes in Charged and Neutral One-component Systems, Physical Review, Vol. 94, No. 3, pp. 551-525.
  12. Benzi, R. et al., 1992, The Lattice Boltzmann Equation: Theory and Applications, Physics Reports, Vol. 222, No. 3, pp. 145-197. https://doi.org/10.1016/0370-1573(92)90090-M
  13. Marie, S. et al., 2009, Comparison between Lattice Boltzmann Method and Navier-stokes High Order Schemes for Computational Aeroacoustics, Journal of Computational Physics, Vol. 228, No. 4, pp. 1056-1070. https://doi.org/10.1016/j.jcp.2008.10.021
  14. Qian, Y. H. et al., 1992, Lattice BGK Models for Navier Stokes Equation, Europhysics Letters, Vol. 17, No. 6, pp. 479-484. https://doi.org/10.1209/0295-5075/17/6/001
  15. Hecht, M. and Harting, J., 2010, Implimentation of On-site Velocity Boundary Conditions for D3Q19 Lattice Boltzmann Simulations, Journal of Statistical Mechanics, P.01018.
  16. Lee, S. and Cheong, C., 2014, Investigation Into Aeolian Tone Noise by Twin Tandem Square Cylinders in Duct Using Lattice Boltzmann Method, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 24, No. 12, pp. 962-968. https://doi.org/10.5050/KSNVE.2014.24.12.962
  17. Lee, S. et al., 2015, Characterization of Buffeting Noise Through a Rear Window in an Automobile Using LBM, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 25, No. 10, pp. 692-699. https://doi.org/10.5050/KSNVE.2015.25.10.692
  18. Bres, G. et al., 2009, Properties of the Lattice Boltzmann Method for Acoustics, 15th AIAA/CEAS Aeroacoustics Conference, AIAA 2009-3395.
  19. Herpe, F. V. et al., 2011, Wavenumber-frequency Analysis of the Wall Pressure Fluctuations in the Wake of a Car Inside Mirror, AIAA/CEAS Aeroacoustics Conference, pp. 3823-3839.