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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
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2308
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By using hammering pulseinspirit method, the experimental modal analysis of a refrigeration compressors 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 compressors 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 compressors shell are essentially the outwardexpanding and inwardcontracting 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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《NonSteadyState Noise Signal Analysis of Fans》
GUO Wei;ZUO Shu-guang;CEHN Rui-feng;HE Rong
2010, 30 (
1
): 78-81. DOI:
10.3969/j.issn.1006-1355.2010.01.078
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2435
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Based on wavelet package transform technology, this paper proposes a method for analyzing the frequency characteristics of nonsteadystate signals in an energyratio and frequencyband coordinate system. Result of this method is compared with that of common frequency spectrum method. The correctness and feasibility of this method is verified. Meanwhile, taking the fan's noise signal of a fuel cell vehicle as an example with a lowfrequency sinusoidal interference signal chosen as the representation of periodic signals, the periodic signals hidden in the nonsteadystate signals are identified. Finally, the fan's noise signals are analyzed. The noise due to low and medium frequency vibration and the noise due to high frequency vibration in the signals are separated. Their information is extracted in timedomain. The measures for further noise reduction are proposed.
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