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《Experimental Modal Analysis of a Refrigeration Compressor’s Shell》
GUO Wei;LIU Bin;FENG Tao;ZHANG Yi
   2010, 30 (3): 67-70.   DOI: 10.3969/j.issn.1006-1355.2010.03.018
Abstract （2307）      PDF（pc） （242KB）（1411）       Save
By using hammering pulseinspirit method, the experimental modal analysis of a refrigeration compressors shell is carried out. The fundamental modal parameters, including natural frequencies (1kHz 4kHz), damping and mode shapes, are estimated and identified. The intrinsic vibration characteristic of the compressors shell is obtained. Based on the experimental modal analysis, the dynamic characteristic of the shell structure is investigated. The results show that the main modal shapes of the compressors shell are essentially the outwardexpanding and inwardcontracting vibrations. The main cause of noise radiation is the intrinsic vibration of the shell. The results of the experimental modal analysis can provide a useful reference for vibration and noise reduction of the compressors.
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《ODS & Low-frequency Noise Analysis on the Tilt Open Drum Washing Machine》
LIU Bin;FENG Tao;WU Xue;HUANG Zhi-gang;ZHU Teng-fei
   2010, 30 (3): 50-54.   DOI: 10.3969/j.issn.1006-1355.2010.03.014
Abstract （3684）      PDF（pc） （268KB）（1698）       Save
By using operational deflection shapes (ODS) technology, the vibration of a tilt open drum washing machine （7-600Hz）during dehydration was investigated. Combining with the noise measurement results, the correlation between vibration and noise during dehydration was preliminary discussed. It showed that, the vibration of the machine excited by the unbalance force of the running parts and the electromagnetic force of the electromotor, and the lowfrequency noise was closely related to the vibration. The noise level of both left and right sides were higher than front and back sides. To decrease the noise level, it can modify the frequencyresponse of the machine.
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