用于新型等效原理空间实验检验的静电加速度计设计

Design of an electrostatic accelerometer for space test of new equivalence principle

等效原理是爱因斯坦广义相对论的基本假设之一,在更高精度上检验等效原理是否成立可以预言新型基本相互作用力。新型等效原理是我国科技工作者提出的一种假设,通过检验两个相同材料但自旋状态不同的宏观物体的自由落体运动来检验等效原理可能存在的破坏。提出了一种面向空间检验新型等效原理的差分静电加速度计设计方案,给出了地面实验用原理样机的结构设计,对结构模态和温度应力进行了有限元仿真;依据支承刚度和量程约束条件,对径向和轴向静电支承控制回路进行了设计和仿真分析;建模分析了高真空下转子静电加转驱动回路的主要性能,仿真结果表明启动过程中达到目标转速（10^4 rpm）的启动时间为36.9 min。

The equivalence principle（EP） is a fundamental hypotheses of Einstein＇s general relativity. Testing EP with extremely high accuracy could possibly predict the spin-spin interaction force between rotating extended bodies. The new equivalence principle（NEP） is an additional hypotheses for EP which was proposed by Chinese scientists and could be tested by the free-fall motion between a rotating extended body and a non-rotating one with the same material. A conceptual design of the differential electrostatic accelerometer for space test of the NEP was presented. The design of a sensor core, its modal analysis and simulation of temperature stress were introduced for on-ground experiment. The electrostatically suspended multi-axis system for ground experiment was designed and simulated according to constraints on its suspension stiffness and measuring range. The dynamics of a variable-capacitance motor in high vacuum was modeled in an effort to predicate the start-up response. The simulation results indicate that it will experience a spin-up time of 36.9 min to drive the rotor from 0 to its rated speed of 10^4 rpm.