Accession Number : ADA141856

Title :   An Integrated, Optimization-Based Approach to the Design and Control of Large Space Structures.

Descriptive Note : Annual scientific rept. 1 Oct 83-1 May 84,


Personal Author(s) : Polak,E ; Pister,K S ; Taylor,R L

PDF Url : ADA141856

Report Date : 01 May 1984

Pagination or Media Count : 21

Abstract : The investigators proposed to consider the design of large space structures which are required to perform large amplitude maneuvers at the end of which they are required to remain locked on a target. They proposed to deal with the pointing of the LSS in two stages. In the first stage, the control task is to rapidly redirect the pointing direction of the LSS reference axis, e.g., the line-of-sight of a telescope or antenna, by open loop optimal control, the large motions of the LSS induced by the maneuver must quiet down so that the control of the LSS can be transferred to a linear, closed loop control system. The task of the latter is to damp out the induced structural vibrations, and, finally, to lock the pointing direction on the target. For the purpose of obtaining a tractable model problem for the research, the investigators shall initially assume that the LSS is a beam. The investigators shall use a nonlinear beam model for the large motions, and they shall use a linear beam model to describe the small displacements as a perturbation around the equilibrium rigid body configuration. In fully developing the model problem, described within the investigators shall first develop the equations of motion for a beam under large and small displacement conditions. They shall then use the resulting equations in transcribing sample design specifications into infinite systems of inequalities. (Author)

Descriptors :   *Mathematical models, *Equations of motion, *Solid bodies, *Beams(Structural), Aiming, Targeting, Control systems, Optimization, Line of sight, Vibration, Displacement, Computerized simulation, Space systems

Subject Categories : Numerical Mathematics
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE