摘要
对振动台在大行程移动过程中导轨不平顺引起的倾斜效应进行了理论分析,选择0.1 Hz及以下频点开展振动台导轨不平顺引起的台面倾斜对测试结果影响的定量化分析。结果表明,振动台面在移动过程中的不确定倾斜对地震计水平分量灵敏度的影响大于对垂直分量灵敏度的影响。采用高精度水平仪获取水平振动台在不同行程下的运动轨迹起伏变化,并基于倾斜效应的影响机制,用Labview语言实现补偿系统,在地震计的振动测试中对测试结果进行动态补偿。测试结果表明,经过动态补偿,导轨不平顺不再对灵敏度校准结果存在明显制约,可大幅提高地震计的低频测试精度。
This paper theoretically analyzed the influence of the guide rail irregularity on calibration of very-broadband seismometers under long stroke motions on shake table,and then quantitatively analyzed the oblique effect on calibration of seismometers on shake table due to the guide rail irregularity at 0.1 Hz and lower frequencies.The results indicate that oblique effect has a larger impact on sensitivity of the horizontal component than that of the vertical component.Higher-precision level meter was used to get the motion trace of the horizontal shake table under long stroke.Based on the influence mechanism of the guide rail irregularity and the data obtained from the level meter,a dynamic compensation system was designed with the software language of Labview.Test results suggest that the calibration accuracy is significantly improved at lower frequencies.Therefore,the dynamic compensating method is effective for very-broadband seismometer testing on shake table.
作者
马洁美
范晓勇
何闻
Ma Jiemei;Fan Xiaoyong;He Wen(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China;School of Mechanical Engineering,Zhejiang University,Hangzhou 310027,China)
出处
《地震学报》
CSCD
北大核心
2023年第6期1111-1117,共7页
Acta Seismologica Sinica
基金
中国地震局地球物理研究所基本科研业务费专项(DQJB20B19)
国家重点研发计划(2019YFC1509503)联合资助.
关键词
振动台
导轨不平顺
大行程
动态补偿
shake table
guide rail irregularity
long stroke
dynamic compensation
