加速度谐波失真度对速度型地震计振动台标定的影响

摘要

Acceleration and velocity harmonic distortion are theoretically ana-lyzed,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 refer-ence 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.%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。