Study of time-domain identification technology of dynamic load location

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (17) : 74-78.

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Study of time-domain identification technology of dynamic load location

ZHU De-chun1,2 ZHANG Fang２，ＪＩＡＮＧＪｉｎｈｕｉ２，ＺＨＡＮＧＷｅｉｍｉｎ1

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Abstract

The actual measured vibration acceleration signal was analyzed and the dynamic load quantity was identified by GDE algorithm based on Gerschgorin’s Disk Theorem. The structural finite element model was built, then the dynamic load identification method in time-domain fitted based on orthogonal polynomial was used to fit the equivalent dynamic load on virtual location. The mathematical model of dynamic load location identification in time-domain was built based on optimization theory. The root mean square value of vector of the model result was calculated, which was used as distinguish basis to identify dynamic load location. The mean value discriminating coefficient solution of dynamic load location identification was proposed. Computer simulation and experimental results show that the method is correct and feasible to idetntify the location of one or more harmonic load or arbitrary time-varying dynamic load.

Key words

Load location / Time-domain identification / Gerschgorin’s Disk Theorem / Orthogonal polynomial / Virtual location / Discriminant coefficient of mean value

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ZHU De-chun; ZHANG Fang;ＪＩＡＮＧＪｉｎｈｕｉ;ＺＨＡＮＧＷｅｉｍｉｎ. Study of time-domain identification technology of dynamic load location[J]. Journal of Vibration and Shock, 2013, 32(17): 74-78