Vibration Analysis Of Air-cooled Refrigerator Housing Under Double Source

In modern life,the features of large-capacity and multi temperature zones in air-cooled refrigerators have been favored by consumers.Because of the large volume of the air-cooled refrigerator,the compressor refrigeration can not achieve better cooling effect when multi temperature cooling is implemented.The method of increasing the fan auxiliary refrigeration is chosen to meet the demand for the different refrigerating effects in multiple temperature zones of refrigerators.This method,while achieving the cooling effect,also causes the refrigerator to generate a relatively large vibration and noise,which has caused a certain impact on people’s lives.This article takes the AUCMA model of a multi door air-cooled refrigerator as the research object,analyzes its vibration characteristics under the double vibration source excitation of the reciprocating compressor and the integrated centrifugal fan,and proposes an improve proposals to reduce the transmission of vibration energy.First,the vibration characteristics of single vibration source and the double vibration sources are analyzed,and the excitation of vibration source is transmitted to the air-cooled refrigerator housing.On this basis,the system’s coupling dynamics model is established and the vibration response theoretical output is calculated.The vibration transfer function model of the system is constructed,and the horizontal and vertical vibration response outputs of the system is obtained by using MATLAB.It is found that the dynamic fluctuation of the vibration number is obvious in the low frequency section of the 0-200Hz.Then,the modal analysis of the air-cooled refrigerator housing is made by using ANSYS Workbench,and the first 20 natural frequencies and mode shapes of the refrigerator housing are obtained.According to the vibration pattern,five positions are selected as detection points:the measuring point is the joint between the door and the drawer;the left surface of the test point two refrigerator;the measuring point three in the middle of the refrigerator;the position of the right side line of the test point four,and the base of the bottom of the test point five compressor.When the vibration amplitude is applied,the amplitude of the vibration response at five measuring points is obtained by the vibration source alone and simultaneously.The refrigerator housing vibrating compressor is found to be the main excitation source,and the fan is the secondary excitation source.In addition,the vibration of the refrigerator door and the pipeline had a non-negligible impact on the vibration of the refrigerator housing.Finally,the Signature signal characteristic test module of the LMS vibration measurement system is used to collect and process the vibration output signal when the compressor and the fan are separately excited and simultaneously stimulated.The experimental values of vibration response are obtained and the simulation results are compared to verify the accuracy of the simulation results.In addition,the experimental results show that the vibration of refrigerator doors and pipes also has a certain influence on the vibration of the refrigerator.According to the vibration characteristics of the air-cooled refrigerator housing,the method of adding vibration-absorbing material is adopted to reduce the transmission of vibration energy and improve the vibration-reduction noise-reduction purpose for the vibration transmission path.