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Numerical Simulation of Refrigerating Compressor Acoustic Characteristics and Research of Noise Reduction

Author: MengXiaoHong
Tutor: TongShuiGuang；JinTao
School: Zhejiang University
Course: Chemical Process Equipment
Keywords: Refrigerator compressor Muffler Numerical Analysis Optimization Case Noise radiation Fluid-structure interaction Lubricating oil Noise Reduction Energy-saving
CLC: TM925.21
Type: Master's thesis
Year: 2006
Downloads: 437
Quote: 3
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Abstract


With the continuous development of the social economy , the refrigerator has been indispensable in everyday life . Reducing the noise of the refrigerator , the living environment has a very important significance to improving the way people work . Carried out for reciprocating refrigerator compressor suction muffler and shell noise reduction achieved satisfactory noise reduction effect . On the basis of the Hermetic refrigerator compressor noise source identification and transfer path analysis reciprocating compressor noise generated noise reduction measures can be taken , the current research status and research trends comprehensive exposition . Meanwhile, a detailed description of the classification of the muffler , the muffler performance evaluation and analysis methods of muffler characteristics . The use of finite element numerical analysis method to calculate the transmission loss of the muffler curve , and the bulkhead position intubation bulkhead position , air intake position three structural parameters of the muffler transmission loss . The results show that the relatively large , the impact of the bulkhead position muffler high frequency performance muffler ; the intubation position muffler has an impact in the the largest anechoic frequency and high-frequency transmission loss of the low- frequency band ; transmission loss of the location of the intake manifold to the muffler the impact is not just high frequency transmission loss . Reduce case noise radiation is an important method of reducing compressor noise , using the finite element and boundary element method to study the impact of different parameters on the casing noise radiation . The results show that when the pump body the bottom supporting manner with the housing connection , the housing of a low noise radiation ; housing noise radiation under the action of radial force , tangential force , followed , while the minimum axial force ; housing . thicker , lower housing noise radiation ; increased damping of the housing , to reduce the noise radiation of the housing , and that the corresponding peak will be reduced ; noise radiation of the housing with the fillet radius of the upper housing . increase reduced, so increased fillet radius of the beneficial decrease in compressor noise . Use of fluid-structure coupling numerical analysis method to study the radiation impact of the oil on the shell noise , found the housing in the peak corresponding to the frequency of the radiated power between 1000Hz-2000Hz With elevated oil level gradually moving to higher frequency , while the peak value can also be increased.

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CLC: > Industrial Technology > Electrotechnical > Electrification,electrical energy application > Household appliances and other electrical equipment > Refrigeration appliances > Refrigerator
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