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

  • 제21권9호
  • /
  • Pages.787-797
  • /
  • 2011
  • /
  • 1598-2785(pISSN)
  • /
  • 2287-5476(eISSN)
한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
권호 표지
DOI QR코드

DOI QR Code

CAM 곡선 개선에 의한 차량용 공조기의 소음 저감 평가

Evaluation for Noise Reduction of the HVAC by Modification of CAM Curve

  • 투고 : 2011.02.28
  • 심사 : 2011.08.24
  • 발행 : 2011.09.20
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

The noise in a vehicle is an important factor for customers purchasing a car. Particularly, reduction of the noise that is generated from HVAC(heating, ventilation and air conditioning) is very important since it has considerable effects on interior noise. In general, identification of noise source is crucial to reduce noise level. The complex acoustic intensity method is widely used to obtain the accurate measurement and identification of noise source. Therefore, in the previous study, noise source of HVAC was identified through experimental approach using the complex acoustic intensity method. In this study, we are intended to confirm reduced level of noise by comparing the result between before and after modification of cam curve that is based on identified noise source of HVAC. It is found out that noise source of HVAC are motor and cam area using the complex acoustic intensity method in the previous study. We performed experiments to compare noise level between before and after modification of cam curve. Especially, it can be seen that complex acoustic intensity method using both active and reactive intensity is vital in devising a strategy for comparison to noise level. Also, the vector flow of acoustic intensity was investigated to identify sound intensity distributions and energy flow in the near field of HVAC.

키워드

참고문헌

  1. Oshino, Y., et al., 1988, Complex Acoustic Intensity and It's Application, JSAE, Vol. 42, No. 12, pp. 1587-1595.
  2. Junger, M. C. and Feit, D., 1994, Sound, Structures and Their Interaction, The MIT Press, pp. 92-149.
  3. Yang, J. J. and Lee, D. J., 2010, Identification of Noise Source of the HVAC Using Complex Acoustic Intensity Method, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 20, No. 11, pp. 1089-1096. https://doi.org/10.5050/KSNVE.2010.20.11.1089
  4. Kim, S. H., Ahn, J. H. and Oh, J. E., 1997, Acoustic Radiation Characteristics from Flexible Steel Plate Excited by Acoustic Loading in an Rectangular Enclosure, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 7, No. 3, pp. 457-466.
  5. Oh, J. E., Kim, S. H. and Han, K. H., 1998, Identification of Noise Source of a Diesel Engine Using Complex Acoustic Intensity Method, SAE Paper, Vol. 6, No. 1, pp. 182-195.
  6. Fahy, F. J., 1987, Sound Intensity, Elsevier Applied Science.
  7. Ginn, K. B., 1988, Sound Field Description Using Complex Sound Intensity Instrumentation, B&K.
  8. Park, D. W., 1994, Behavior of Noise Source for Shape Modification of Plate by Acoustic Intensity Method, Hanyang University Press.