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Refrigerator compressor sound field numerical analysis and noise reduction optimization

Author: WangNingFeng
Tutor: JinTao
School: Zhejiang University
Course: Chemical Process Equipment
Keywords: Compressor Refrigerator Down throat Finite Element Vibration Simulation
CLC: TM925.21
Type: Master's thesis
Year: 2005
Downloads: 419
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 . From the refrigerator energy saving measures or from the refrigerator power consumption devices , high efficiency and low noise compressor for energy - saving refrigerator has a very important significance . Energy saving and noise reduction of the compressor sometimes is interrelated. The majority of the noise reduction method will affect the COP, and energy-saving improvements would lead to the improvement of the noise spectrum changes . This paper factors affect the compressor COP and causing vibration causes a noise abatement measures , the current study is summarized clarify . Use of the finite element method , discussed in the presence of frozen oil , and reduce the impact of the the compressor internal sound field ; frozen oil in a certain range of the sound field modes , thus affecting the role of fluid-structure interaction ; indirectly affect the transmission of compressor noise . Although the frozen oil change only 60mml but can not ignore the impact on the internal sound field can be seen by the calculated data . With the decrease of the volume of fluid , the modal frequency of the sound field to move to lower frequencies . With the increase of the housing constraints , the natural frequency of the housing conference shift. Compared with the experimental results consistent with the experimental results can be drawn that the presence of frozen oil compressor shell sound field distribution . Reduce structure-borne noise radiation is a commonly used method of noise reduction , it can achieve the purpose of noise reduction in the smallest change in the existing product , the article discusses the three-dimensional surface geometry of the shell parameters ( ring to the parameters , fillet between the various surfaces , geometric asymmetric) affect the mode of the compressor casing and the use of the housing plus the ribs , reducing the radius of curvature of the face of the geometric asymmetric transmittance of the housing of the internal sound source . The calculation results can be obtained , the geometry of non - symmetrical structure of the noise reduction effect of the multi - frequency segment , while the natural frequency of changing the radius of curvature of the shell surface of the shell to improve larger .

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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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