Study On The Transfer Path Of Vibration Noise Of Air Conditioner Outdoor Unit

Because of the continuous improvement of people’s living standards, air conditioning appliances has become indispensable in people’s daily life, and has become more and more important. Low noise and small vibration amplitude are to determine the household air conditioning comfort, product quality, and are important reference indexes. The air-conditioning outdoor unit as the research object, this thesis used the transfer path analysis method and established outdoor unit transfer path analysis model. Combining experiments and analyze of outdoor unit of air conditioner’s Noise and vibration characteristics, was carried out.Firstly, the basic theory of transfer path analysis method was introduced, and the method of reducing vibration and noise reduction based on transfer function was analyzed. The air-conditioning outdoor unit vibration and noise generation mechanism was analyzed, and, on the basis of the actual situation, air-conditioning outdoor unit of transfer path analysis model was built, the structural sound transmission path was analyzed and the methods to obtain the transfer function was introduced in detail.In a semi anechoic chamber, air-conditioning outdoor unit vibration and noise transfer path analysis test was carried out, and the noise characteristics of the air conditioning outdoor unit point and the target point indication was studied. Results show that, the outdoor unit of the air conditioner Noise Frequency mainly concentrated below 1000Hz, the 300Hz～360Hz is the main frequency peak.By hammering test method, the path transfer function of outdoor unit of the air conditioner in was obtained, and conditions are dealt with transfer path supporting premises by the work load, fitting of the spectrum and the actual measurement of the noise spectrum in comparison at the target point. The vibration and noise of the outdoor machine is mainly induced by the structural sound transmission path.Under different conditions, transfer the work load of the path analysis, combine with the air-conditioning outdoor unit of the transmission path of the transfer function, the results show that, the compressor running on 30Hz condition, horizontal direction of the right rear support position of the lower part of the compressor and vertical direction of the right rear support position of the lower part of the compressor with the largest contribution; The compressor running on 60Hz condition, horizontal direction of the right rear support position of the lower part of the compressor and vertical direction of the left front support position of the lower part of the compressor with the largest amount; The compressor running on 80Hz condition, horizontal direction of the right rear support position of the lower part of the compressor and vertical direction of the right support position of the compressor with the largest amount...