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- W3158399922 abstract "NASA's 1976 Viking Mars Orbiters and the Voyager 1977 Jupiter-Saturn flyby spacecrafts carried digital tape recorders (DTR) on board. The recorders for both the missions were very similar except for the use of a brushless d.c. motor in the Voyager DTR. The mechanical part of the DTR consisted of fourteen rotating masses (tape reels, idlers and drive capstans) distributed in different planes and connected by three different elastic couplings (magnetic tape, peripheral belt and drive belts). Time simulations reported in this study were based on a program which employed first order integrators only. Severe numerical convergence problems were associated with the use of transfer function simulation subroutines available in the Continuous System Simulation Language (CSSL). The objective of this study is to verify the adequacy of design of the lead-lag compensator of the frequency loop, to check the accuracy of the analytical expression for the electrical motor transfer function (both arrived at empirically) and to understand in depth the performance of the speed control servo of the spacecraft DTR. Four aspects of the system dynamics were interactively adjusted to arrive at a number of stable system configurations, which had significantly different tape transport and/or compensator gain, DTR damping, system lag and electrical motor transfer function than envisioned in the nominal design by either the empirical or the linear frequency-domain methods." @default.
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- W3158399922 date "1979-03-01" @default.
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- W3158399922 title "Performance verification and system parameter identification of spacecraft tape recorder control servo" @default.
- W3158399922 hasPublicationYear "1979" @default.
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