Download or read book The Dynamics and Control of Large-Flexible Space Structures, Part 10 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-23 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: A mathematical model is developed to predict the dynamics of the proposed orbiting Spacecraft Control Laboratory Experiment (SCOLE) during the station keeping phase. The equations of motion are derived using a Newton-Euler formulation. The model includes the effects of gravity, flexibility, and orbital dynamics. The control is assumed to be provided to the system through the Shuttle's three torquers, and through six actuators located by pairs at two points on the mast and at the mass center of the reflector. The modal shape functions are derived using the fourth order beam equation. The generic mode equations are derived to account for the effects of the control forces on the modal shape and frequencies. The equations are linearized about a nominal equilibrium position. The linear regulator theory is used to derive control laws for both the linear model of the rigidized SCOLE as well as that of the actual SCOLE including the first four flexible modes. The control strategy previously derived for the linear model of the rigidized SCOLE is applied to the nonlinear model of the same configuration of the system and preliminary single axis slewing maneuvers conducted. The results obtained confirm the applicability of the intuitive and appealing two-stage control strategy which would slew the SCOLE system, as if rigid to its desired position and then concentrate on damping out the residual flexible motions. Bainum, Peter M. and Reddy, A. S. S. R. Unspecified Center MATHEMATICAL MODELS; PREDICTION ANALYSIS TECHNIQUES; SLEWING; SPACE SHUTTLE PAYLOADS; SPACECRAFT CONTROL; SPACECRAFT MANEUVERS; ACTIVE CONTROL; EQUATIONS OF MOTION; FLEXIBLE SPACECRAFT; GRAVITATIONAL EFFECTS; LINEAR QUADRATIC REGULATOR; REFLECTORS...