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Online iteration method for waveform reproduction of high-precision seismic simulation vibration table

A technology of earthquake simulation and shaking table, which is applied in vibration testing, testing of machine/structural components, measuring devices, etc. It can solve the problem that the waveform accuracy of the shaking table decreases, cannot meet the requirements of waveform reproduction accuracy, and cannot correct nonlinear errors in real time and other problems, to achieve the effect of simple and convenient operation, and make up for the effect that cannot be corrected in time

Pending Publication Date: 2018-07-17
INST OF ENG MECHANICS CHINA EARTHQUAKE ADMINISTRATION +1
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Problems solved by technology

Due to the nonlinearity of the equipment itself and the nonlinearity of the model due to damage or even destruction during the test, the accuracy of the waveform reproduction of the shaking table is reduced, and the offline iteration cannot correct the error caused by the nonlinearity in real time, so it cannot meet the vibration requirements. Requirements for Waveform Reproduction Accuracy in Bench Model Test
The online iterative method for waveform reproduction of high-precision seismic simulation shaking table aims to solve the problem of the decrease of waveform reproduction accuracy caused by nonlinearity during the shaking table model test

Method used

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  • Online iteration method for waveform reproduction of high-precision seismic simulation vibration table
  • Online iteration method for waveform reproduction of high-precision seismic simulation vibration table
  • Online iteration method for waveform reproduction of high-precision seismic simulation vibration table

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with specific embodiment:

[0019] Such as figure 1 and image 3 As shown, in the shaking table model test of a single-layer frame, first input 10 original acceleration commands to the program, and before the 10 original acceleration commands, the number of data in one frame of 31-Fourier transform will be increased m 1.2 times the zero value, the 11 new acceleration command obtained, the pre-input white noise acceleration command will be added to the corresponding data of the new acceleration command to get 12 input acceleration command, 13 pass 12 input acceleration command a c x 、a c y 、a c z , find 14 autocorrelation function R xx , 15 Post-fixed Fast Fourier Transform FFT 16 self power spectrum G xx and 17 acceleration spectra A c x 、A c y 、A c z , 18 transfer function matrix to 17 acceleration spectrum A c x 、A c y 、A c z Transform to get 19 acceleration signals ...

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Abstract

Provided is an online iteration method for waveform reproduction of a high-precision seismic simulation vibration table. An iteratively corrected transfer function matrix is updated online to improvethe waveform reproduction precision of a vibration table. Online iterative control comprises the following steps: an original acceleration signal is input; after zero is added to command data and white noise is added, an autocorrelation function is obtained through calculation and post-collection Fourier transformation is carried out to obtain an auto-power spectrum Gxx; a command signal Fourier spectrum is multiplied by the inverse of a transfer function matrix to obtain an acceleration signal Fourier spectrum; an acceleration command is obtained after Fourier transformation; a controller inside a vibration table performs the acceleration command, collects an acceleration signal output by the vibration table, and obtains a cross correlation function of the acceleration command and the acceleration signal; a cross-power spectrum Gxy is obtained after post-collection Fourier transformation; the cross-power spectrum is divided by the auto-power spectrum to obtain a transfer function matrix; whether the number of steps of conditional sampling is greater than the number of data in one frame of Fourier transformation is judged; if the number of steps of conditional sampling is greater than the number of data in one frame of Fourier transformation, the transfer function matrix is updated; and if the number of steps of conditional sampling is not greater than the number of data in oneframe of Fourier transformation, the transfer function matrix is kept unchanged, thus completing online iterative control.

Description

technical field [0001] The invention relates to an on-line iterative method for waveform reproduction of a high-precision earthquake simulation shaking table, and belongs to the technical field of building structure tests. Background technique [0002] The waveform reproduction accuracy of the earthquake simulation shaking table is a very important index for the equipment itself and the shaking table model test. Due to the nonlinearity of the equipment itself and the nonlinearity of the model due to damage or even destruction during the test, the accuracy of the waveform reproduction of the shaking table is reduced, and the offline iteration cannot correct the error caused by the nonlinearity in real time, so it cannot meet the vibration requirements. The requirements for the waveform reproduction accuracy of the platform model test. The on-line iterative method for waveform reproduction of high-precision seismic simulation shaking table aims to solve the problem of the dec...

Claims

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Application Information

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IPC IPC(8): G01M7/02
CPCG01M7/022G01M7/025
Inventor 王涛徐国贤田英鹏周惠蒙滕睿高生李海洋
Owner INST OF ENG MECHANICS CHINA EARTHQUAKE ADMINISTRATION
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