NDLI: Disturbance torque rejection properties of the nasa/jpl 70-meter antenna axis servos

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Disturbance torque rejection properties of the nasa/jpl 70-meter antenna axis servos

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hill, R. E.
Copyright Year	1989
Description	Analytic methods for evaluating pointing errors caused by external disturbance torques are developed and applied to determine the effects of representative values of wind and friction torque. The expressions relating pointing errors to disturbance torques are shown to be strongly dependent upon the state estimator parameters, as well as upon the state feedback gain and the flow versus pressure characteristics of the hydraulic system. Under certain conditions, when control is derived from an uncorrected estimate of integral position error, the desired type 2 servo properties are not realized and finite steady-state position errors result. Methods for reducing these errors to negligible proportions through the proper selection of control gain and estimator correction parameters are demonstrated. The steady-state error produced by a disturbance torque is found to be directly proportional to the hydraulic internal leakage. This property can be exploited to provide a convenient method of determining system leakage from field measurements of estimator error, axis rate, and hydraulic differential pressure.
File Size	750853
Page Count	19
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19900010134
Archival Resource Key	ark:/13960/t57d7sb04
Language	English
Publisher Date	1989-11-15
Access Restriction	Open
Subject Keyword	Electronics And Electrical Engineering Controllers Errors Pointing Control Systems Torque Friction Disturbances Numerical Control Hydraulic Equipment Servomechanisms Antennas Wind Meteorology Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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