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http://dx.doi.org/10.5050/KSNVE.2011.21.9.787

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

Jeong, J.E. (한양대학교 기계공학과)
Jung, C.Y. (한양대학교 기계공학과)
Seo, B.J. (한양대학교 기계공학과)
Jeong, U.C. (한양대학교 기계공학과)
Oh, J.E. (한양대학교 기계공학부)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.21, no.9, 2011 , pp. 787-797 More about this Journal
Abstract
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.
Keywords
HVAC; Complex Acoustic Intensity Method; Source Identification; Active Intensity; Reactive Intensity; Cross Spectrum; Vector Flow; Noise Reduction;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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