Investigation of the Gyro Suspension Torques on the NASA-Stanford Gravity Probe B (GP-B) Relativity Mission

Details Investigation of the Gyro Suspension Torques on the NASA-Stanford Gravity Probe B (GP-B) Relativity Mission Investigation of the Gyro Suspension Torques on the NASA-Stanford Gravity Probe B (GP-B) Relativity Mission

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005tmgm.meet.2076o&link_type=abstract

The Tenth Marcel Grossmann Meeting. Proceedings of the MG10 Meeting held at Brazilian Center for Research in Physics (CBPF), Rio

Physics

Scientific paper

The GP-B's mission goal is to measure relativistic effects on the drift rate of the gyroscope. In order to achieve this goal, the GP-B's gyroscope rotor is made to be spherical to better than one part in a million. On this close-to-perfect-sphere rotor, there exist a small residual torques generated by the rotor's suspension system, and these torques produce unwanted non-relativistic drift rate of the gyroscope which is one of the error sources of the mission.
Although this torque is very small, its analysis is crucial, as is experimental validation of the modeling, because the relativistic effect planned to be measured is also extremely small, which means insignificant out-of-roundness of the gyroscope rotor could easily produce an excessive amount of drift for the mission.
Presented is a summary of the theoretical analysis of the support-dependent torques, estimation of the GP-B science-mission drift rate, and result from experimental validation of the modeling of the torque. Also, planned on-orbit activities are summarized.

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