关于检测质量的4旋转加速度计信号叠加的频域分析  

Frequency domain analysis on superposed signal of four rotating accelerometers about proof mass

作　　者：丁昊[1] 蔡体菁[1] 

机构地区：[1]东南大学仪器科学与工程学院,南京210096

出　　处：《中国惯性技术学报》2014年第2期167-171,共5页Journal of Chinese Inertial Technology

基　　金："十二五"863主题项目(2011AA060501)

摘　　要：在旋转圆盘上对称安装4只高精度加速度计,加速度计信号两两相加再相减,再解调制就可以得到重力梯度值。针对上述的4旋转加速度计,研究检测质量对其信号叠加的输出频域特征,推导的频域表达式证明输出中含有高次谐波,相邻谐波的频差是圆盘旋转频率的4倍,即谐波频率分别为6倍频、10倍频、14倍频等。利用stirling公式给出了各次谐波分量幅值的近似计算方法,并进行了数值仿真,结果表明检测质量与圆盘之间的距离越近,谐波分量的幅值越大。The gravity gradient can be obtained from the output signals of four symmetrically mounted high-precision accelerometers on a rotating disk. For this four rotating accelerometers, the frequency domain characteristics of the superposed signal about proof mass are studied. The deduced expressions of frequency domain prove that certain higher harmonic components exist in addition to the signal, and the harmonic frequency offset is four times that of the disc rotation frequency, while the harmonic frequency is 6 times, 10 times or 14 times, etc., respectively. Then the approximate calculation method of each harmonic coefficient is given by using the stirling formula. The numerical simulation results show that, the closer the distance between the proof mass and the disc, the greater the amplitude of harmonic component.

关 键 词：重力梯度仪 旋转加速度计 检测质量 频域分析 谐波 

分 类 号：U666.1[交通运输工程—船舶及航道工程]