Composite signal electrodynamic vibration table reproduction method and vibration reproduction system
An electric vibration table and composite signal technology, which is applied in vibration testing, testing of machine/structural components, measuring devices, etc., can solve problems such as poor reproduction accuracy
Active Publication Date: 2019-04-16
XI AN JIAOTONG UNIV +1
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Problems solved by technology
The method and system involved in the present invention aim at the problem of poor reproduction accuracy in the existing time domain or frequency domain, and propose a hybrid control method that combines time domain waveform reproduction and frequency domain power spectrum reproduction, and uses discrete wavelet transform to realize complex signal processing. Separation of impact components and random components, respectively reproduce the different characteristics of each component of the composite signal in the time domain and frequency domain, and finally output the mixed driving time domain signal, and verify the above method by comparing the effects of experiments and related examples and system effectiveness
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[0047] Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and is not limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.
[0048] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art should understand that they may use different terms to refer to the same component. The specification and claims do not use differences in nouns as a way of distinguishing components, but use differences in functions of components as a criterion for distinguishing. "Includes" or "comprises" mentioned throughout the spe...
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The invention discloses an electrodynamic vibration shaker reproduction method for a composite signal comprising an impact signal and a random vibration signal, and a vibration reproduction system. The method is characterized by separating a random component and an impact component in a composite target signal through a discrete wavelet transform method; obtaining a driving signal of the random component through a frequency domain power spectrum reproduction method, and obtaining a driving signal of the impact component through a time domain waveform reproduction method; superposing the two groups of driving signals and inputting the superposed signals to an electrodynamic vibration shaker, and continuing to separate a random component and an impact component in a response composite signal through the discrete wavelet transform method; and comparing the random component and the impact component in the response composite signal and the random component and the impact component in the composite target signal, and carrying out correction and iteration on the driving signals according to error signals. The method can improve reproduction precision of the impact and random composite signals on the electrodynamic vibration shaker.
Description
technical field [0001] The invention belongs to the field of mechanical environment vibration tests, in particular to an electrodynamic vibrating table reproducing method and a vibration reproducing system of composite signals including shock signals and random vibration signals. Background technique [0002] Mechanical environmental test is an important test method in modern engineering technology, widely used in aerospace, weapons, ships and other defense industry fields and vehicles, electronics and other civilian fields. With the help of mechanical environment equipment, the vibration environment of the test piece or structure in the working state can be reproduced in the laboratory, and the reliability and working life of important components and wearing parts can be tested, which can provide the performance analysis and technical improvement of the test piece. important test basis. [0003] The method of vibration reproduction test can be divided into two types: time ...
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IPC IPC(8): G01M7/02
CPCG01M7/022
Inventor 杨志勃王亚楠刘金鑫陈雪峰谢明军
Owner XI AN JIAOTONG UNIV