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Study on Integrity Inspection Technology for Quality of Digital Strong Motion Accelerograph

Author: YangLiZuo
Tutor: ZhouZhengHua
School: China Seismological Bureau, Institute of Engineering Mechanics
Course: Disaster Prevention and Reduction Engineering and Protective Engineering
Keywords: Relative calibration method The absolute calibration method Amplitude-frequency characteristics Phase-frequency characteristic Consistency of the experimental
CLC: P315.9
Type: Master's thesis
Year: 2010
Downloads: 24
Quote: 1
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Abstract


China Digital Strong Motion Network and is China's largest investment to date, the largest of strong motion observation network. With \Through theoretical analysis and experimental research, test and running performance digital strong motion instrument technical indicators than the measurement techniques explored. This paper studies the content and the results obtained are as follows: 1 of strong motion instrument quality verification technology status quo and the main sensor types more detailed introduction and a brief discussion of the need to carry strong motion instrument quality verification technology. 2 based on the zero-frequency turntable works, experimental test method developed accelerometer sensitivity and linearity. The experimental results show that the application of zero frequency turntable accelerometer sensitivity and linearity of the calibration method is simple and feasible, and more accurate and reliable test accelerometer sensitivity and linearity. The relative calibration method and experimental principle of absolute calibration method briefly introduced to carry out the study based on the absolute calibration of the laser interferometer detection technology, and an absolute the accelerometer calibration test pieces frequency and phase-frequency characteristics of the experimental method. The experimental results show that the absolute calibration method based on the laser interferometer is feasible. Compared with the relative calibration method, the absolute calibration method has a high detection precision, good stability. Works based on the force balance accelerometer analysis of the dynamic response of the accelerometer, and accordingly proposed based functional experiments instrument performance evaluation methods, as well as the method for determining accelerometer natural frequency and damping ratio. The calculation results show that the higher the natural frequency, the faster the response curve rises; smaller the damping ratio, overshoot phenomenon is more obvious. Suitable damping ratio can be reduced overshoot amount, wide frequency characteristics of straight sections, for the accelerometer often using the natural frequency and damping ratio preferably within the range of 0.60 to 0.70, 0.65 to 0.68 optimal. Strong motion observation-based data, record the results of the two different models of strong motion acceleration instrument waveforms contrast, peak acceleration and spectral analysis, in order to evaluate the degree of consistency. The analysis results show that, the peak acceleration maximum relative error of 13%, but the basic waveform and spectral characteristics close. Consistency generation mechanism of the instrument, is proposed based on the consistency of the vibration table test method.

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CLC: > Astronomy,Earth Sciences > Geophysics > Earth ( rock circles ) physics ( geophysics ) > Seismology > Engineering seismology
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