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Misalignment and Resonance Torques and Their Treatment in the GP-B Data Analysis

机译：GP-B数据分析中的偏心和共振扭矩及其处理

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摘要

Classical torques acting on the GP-B gyroscopes decrease the accuracy in the measurement of the relativistic drift rate. Based on measurements made during the year-long science data collection, tests done following the science data collection, and a theoretical analysis of potential torques, there are two dominant classical torques acting on the gyroscopes. The first torque, known as the misalignment torque, has a magnitude proportional to the misalignment between the gyroscope spin axis and the satellite roll axis and is aligned perpendicular to the plane containing these two vectors. The second torque, known as the resonance torque, mainly produces a permanent offset in the orientation of the gyroscope spin axis when a harmonic of the gyroscope polhode frequency is in the vicinity of the satellite roll frequency. These two torques have the same physical origin: an electrostatic interaction between the patch effect fields on the surfaces of the rotor and the housing. In the post-mission data analysis, the change in the gyroscope orientation due to both of these torques can be clearly separated from the relativistic drift rate. Keywords Gravity probe B - Experimental tests of gravitational theories - Patch effect - Gyroscope torques PACS 04.80.Cc - 07.05.Kf - 45.40.Cc
机译：作用在GP-B陀螺仪上的经典扭矩降低了相对论漂移率的测量精度。根据为期一年的科学数据收集期间的测量，科学数据收集之后进行的测试以及对潜在扭矩的理论分析，陀螺仪上有两个主要的经典扭矩起作用。第一转矩称为失准转矩，其大小与陀螺仪旋转轴和卫星俯仰轴之间的失准成比例，并且垂直于包含这两个矢量的平面对准。当陀螺仪极化频率的谐波在卫星侧倾频率附近时，称为共振扭矩的第二扭矩主要在陀螺仪旋转轴的方向上产生永久偏移。这两个转矩具有相同的物理起源：转子和壳体表面上的补片效应场之间的静电相互作用。在任务后数据分析中，可以将这两个扭矩导致的陀螺仪方向变化与相对论漂移率清楚地区分开。关键词重力探头B-引力理论的实验测试-斑块效应-陀螺仪转矩PACS 04.80.Cc-07.05.Kf-45.40.Cc

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