Using three different approaches, laboratory results were obtained for the mass unbalance of the NASA Gravity Probe B rotors designed to test Einstein's gravitational theory. In the first method, measurements of the precession rate of the spinning rotor are deduced from spin-frequency components of the trapped flux. The other approaches involve the measuring of niobium coating thickness using an electron back-scattering device and the measuring of the periodicities of a tumbling rotor. Assumptions of the methods are discussed, along with reasons for discrepancies among the results.
Mass unbalance analysis for GP-B rotors
AIAA Guidance, Navigation and Control Conference ; 1988 ; Minneapolis, MN, United States
1988-01-01
Aufsatz (Konferenz)
Keine Angabe
Englisch
Mass unbalance analysis for GP-B rotors
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