一种基于扭秤的重力梯度动态测量方法  

A Dynamic Measurement Method of Gravity Gradient Based on Torsion Balance

作　　者：叶子薇 王飞 包福 黄安贻[1] 余烨 胡红波 王若琳 YE Ziwei;WANG Fei;BAO Fu;HUANG Anyi;YU Ye;HU Hongbo;WANG Ruolin(School of Mechanical and Electronic Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China;Hubei Institute of Measurement and Testing Technology,Wuhan,Hubei 430223,China;Wuhan Optics Valley Aerospace Sanjiang Laser Industry Technology Research Institute Co.Ltd,Wuhan,Hubei 430073,China)

机构地区：[1]武汉理工大学机电工程学院,湖北武汉430070 [2]湖北省计量测试技术研究院,湖北武汉430223 [3]武汉光谷航天三江激光产业技术研究院有限公司,湖北武汉430073

出　　处：《计量学报》2024年第1期44-51,共8页Acta Metrologica Sinica

基　　金：国家重点研发计划(2018YFF0212401);湖北省市场监管局科研项目(Hbj-kj201807)。

摘　　要：针对传统的扭秤式重力梯度仪测量准确度高,但稳定性差且测量效率低的问题进行了研究。引入动态调制方法,并将Z型扭秤结构应用于动态测量模式,实现重力水平梯度和重力曲率值的同时测量。在信号处理过程中使用旋转滤波和遗传算法,可有效消除扭摆自由振荡对目标峰值的影响并提取目标频率的幅值和相位。仿真实验结果表明,遗传算法从动态测量模式信号中提取目标重力梯度值引入的不确定度分量不超过0.0077 E(1 E=10^(-9)/s^(2))。使用遗传算法进行数据后处理时,系统的测量不确定度评定为0.0582 E。To study the problem that the traditional torsion balance gravity gradiometer has high accuracy but poor stability and low measurement efficiency,introducing the dynamic modulation method and applying the Z-type torsion balance structure to the dynamic measurement mode to realize the simultaneous measurement of gravity horizontal gradient and gravity curvature.Using rotating filter and genetic algorithm in the process of signal processing can effectively eliminate the influence of free oscillation of torsion pendulum on target peak value and extract the amplitude and phase of target frequency.The simulation results show that the uncertainty component introduced by the genetic algorithm to extract the target gravity gradient value from the dynamic measurement mode signal does not exceed 0.0077 E(1 E=10^(-9)/s ^(2)).When genetic algorithm is used for data post-processing,the measurement uncertainty of the system is evaluated as 0.0582 E.

关 键 词：重力梯度 动态测量 扭秤法 遗传算法 测量不确定度 

分 类 号：TB931[一般工业技术—计量学]