海洋重力仪采样质量悬挂系统分析

Analysis of the Suspension System of Sampling Mass in the Marine Gravimeter

针对轴对称型海洋重力仪采样质量悬挂系统的刚度设计问题,运用材料力学和最小势能原理重点对水平和垂直方向的等效刚度进行理论分析,分析结果表明:系统在水平面内各方向的刚度相等,与拉丝材料的弹性模量和横截面积成正比,与拉丝的初始长度成反比;系统竖直方向等效刚度与绷紧弹簧的张力成正比,与拉丝的初始长度成反比。对仪器工程应用中,因拉丝弯曲而产生的干扰阻力进行了评估分析,结果表明在正确选择拉丝的材料和几何尺寸的条件下,由干扰阻力所引起的误差可以忽略不计。

The horizontal and vertical stiffnesses of the sampling mass suspension in the axial symmetrical marine gravimeter system are mainly studied with material mechanics and the principle of minimum potential energy. The results show that,in the horizontal plane,the suspension system has in all directions the same stiffness which is proportional to the elastic modulus and cross sectional area of the wires,and inversely proportional to the initial length of the wires; the equivalent stiffness of the suspension system in vertical direction is proportional to the initial tension of the springs,and inversely proportional to the initial length of the wires. In engineering application,the interference resistance by curving of the wires is analyzed,the results show that,with rationally chosen materials and geometry dimensions of the wires,the error caused by the interference resistance could be negligible.