| Determining the source of the vibration system under actual operating conditions and itsmathematical description is the most thorny problem in vibration engineering. In recent years, withthe development of vibration theory, the technology of load location identification in frequencydomain and in time domain has been developed rapidly, some had been successfully used inengineering practice.In this paper, based on the linear elastic one dimensional model and two dimensional model asthe research object, researched on some issues of dynamic load location identification in time domain.The basic theory of Wilson-θ method had been introduced, and analyzed the stability of thealgorithm; derived the dynamic load identification model of Wilson-θ invert-analysis method, andthe tentative research on the stability of the method; researched on the accuracy of the loadidentification in time domain, and summarized certain rules; for the divergent problem of dynamicload identification in time domain, several mathematics amendment methods had been proposed;discussed the application of Wavelet de-noising method and filtering de-noising method in dynamicload identification in time domain. Simulation examples explained the correctness and a certainfeasibility of the above studies.In addition, this paper also researched identification technology of centralized dynamic loadlocation of continuous and uniform beam in time domain, explored the dynamic load locationidentification method called"minimum inverted difference factor method". For known amplitude andunknown location of dynamic load, proposed "minimum inverted difference factor method Ⅰ", andfor unknown amplitude and location of dynamic load, proposed "minimum inverted difference factormethod Ⅱ", and derived corresponding theoretical formula.Simulation examples indicated that higherrecognition accuracy and better de-noising of "minimum inverted difference factor method", had acertain correctness and research. |
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