Influence of acceleration harmonic distortion on shake table calibration for velocity seismometer
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摘要: 本文对加速度和速度谐波失真度进行了理论计算， 并基于美国国家仪器公司研发的实验室虚拟仪器工程平台(Labview), 设计出低频振动信号数字化测量系统， 实现了振动台面对加速度波形、 速度波形及其失真度的测量. 基于该系统的实验数据与中国计量科学研究院设定的参考值偏差较小. 对地震计的测试结果表明， 加速度波形及其失真度对振动波形的精度描述更为严格， 能有效提高地震计振动测试的准确程度.Abstract: Acceleration and velocity harmonic distortion are theoretically analyzed, and then based on laboratory virtual instrument engineering workbench (Labview for short) digital measuring system is designed for the low-frequency vibration signals. Deviation between testing data from this system and the reference value provided by National Institute of Metrology is minor. Seismometer calibration results indicate that acceleration waveform and its distortion reflect the actual condition of the shake table in a much harsher way, providing more precise information for the seismometer test on the shake table.
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Keywords:
- harmonic distortion /
- velocity /
- acceleration /
- Labview /
- calibration on shake table
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图 1 基于Labview的振动信号数字化测量系统示意图
Figure 1. Sketch of measurement system for digitalized vibration signal based on Labview
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图 3 台面输出的加速度波形与速度波形比对
Figure 3. Comparisons between output acceleration and velocity of the shake table
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图 4 加速度波形和速度波形失真度随行程的衰减关系
Figure 4. Distortion attenuation of acceleration waveform (circle) and velocity waveform (square) with the displacement
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图 5 行程由4 mm (左)增大至23.97 mm (右)时的加速度波形变化(a)与速度波形变化(b)
Figure 5. Changes of acceleration waveform (a) and velocity waveform (b) with the displacement increasing from 4 mm (left) to 23.97 mm (right)
表 1 标准套组在中国测震台网仪器质量检测中心垂直振动台上的测试结果及其与计量院标准振动台的比对结果
Table 1 Measurement results of the standard set on the vertical shake table of China Seismograph Network Equipment Testing Center and comparisons with standard values of National Institute of Metrology
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表 2 测试频点为1 Hz时随速度变化的台面和地震计输出数据
Table 2 Output of the shake table and seismometer with the velocity at 1 Hz
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表 3 测试频点为0.05 Hz时随行程变化的台面输出波形失真度数据
Table 3 Waveform distortion data of the shake table with the displacement at 0.05 Hz
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中国地震局监测预报司. 2003. 数字地震观测技术[M]. 北京: 地震出版社: 51-53. Department of Earthquake Monitoring and Prediction, China Earthquake Administration. 2003. Technical Specification for Digital Observation of Earthquakes[M]. Beijing: Seismological Press: 51-53 (in Chinese).
中国计量科学研究院. 1995. GB/T13823.11—1995. 振动与冲击传感器的校准方法: 激光干涉法低频振动一次校准[S]. 北京: 中国计量出版社: 1-3. National Institute of Metrology. 1995. GB/T13823.11—1995. Methods for the Calibration of Vibration and Shock Pick-ups: Primary Vibration Calibration by Laser Interferometry at Low Frequencies[S]. Beijing: China Metrology Publishing House: 1-3 (in Chinese).
International Organization for Standardization of Switzerland. 1999. ISO 16063.11—1999. Methods for the Calibration of Vibration and Shock Transducers. Part Ⅱ: Primary Vibration Calibration by Laser Interferometry[S]. Geneva: Internationel Organization for Standardization: 1-2.
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