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Transfer characteristics of vehicle air conditioners’ booming noise
임성택,주경훈,Hew Nam Ahn,박영덕,강연준 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.6
Vehicle air conditioners generate a booming noise when pressure pulsation in the compressor is generated and transmitted to vehicleinteriors through the attached pipes and chassis, which constitute a typical noise transfer path between the compressor and the interior. Inthis study, the transfer path analysis and operational deflection shape methods were employed for analyzing the characteristics of noisetransfer paths, and acoustic intensity was measured through empirical experiments for analyzing the characteristics of the response system. The rigid body mode of the double pipe influences the dynamic behaviors of the liquid pipe, which is the major noise contributionpath. The force exerted on the liquid pipe generates not only structure-borne noise but also air-borne noise in a heating, ventilation andair-conditioning system. An experiment was carried out to reduce such noise by distributing the high noise contribution to the low one. Through this experiment, we propose a path coupling method for noise reduction that modifies the contribution of each transfer pathfrom the source to the receiver.
임승택(Seung Taek Lim),주경훈(Kyung Hoon Joo),안휴남(Hew Nam Ahn),박영덕(Young Duk Park),강연준(Yeon Jun Kang) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
Transfer path analysis(TPA) and operational deflection shape(ODS) have been widely utilized to analyze the characteristics of noise. TPA enables to decompose a noise into air-borne and structure-borne noises then estimate the path contribution of noise. ODS enables to analyze a moving shape and direction of interest components at a particular frequency. In this paper, TPA and ODS are applied to transfer paths of air-conditioner booming noise in a vehicle to reduce noise level, then a fixture is mounted it’s path for distributing the high portion path contribution to the low portion path contribution. Through this experiment, the reduction of sound pressure level in air-conditioner booming noise is observed. Thereafter, TPA is again employed to verify the results of contribution.