Accession Number : ADA293141

Title :   Control of Flexible Spacecraft Structures Using H-Infinity Wave Absorbing Control.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Strong, Ronald E.

PDF Url : ADA293141

Report Date : DEC 1994

Pagination or Media Count : 68

Abstract : This work studies the use of a wave absorbing control law for vibration suppression of flexible spacecraft structures. A major advantage of this method is that it does not involve truncation into a finite dimensional mathematical model. A closed loop scattering matrix was derived which gives the relationship between incoming waves, outgoing waves, sensor and actuator. The control law was determined by minimizing the H-infinity norm of this matrix. The control law was applied to the Naval Postgraduate School's Flexible Spacecraft Simulator (FSS) for vibration suppression. The simulator's flexible beam was controlled using piezoceramic wafers as sensors and actuators. The H-infinity wave absorbing controller contributed significant damping to the structure, especially at the first mode of 1 Hz. Therefore, wave absorbing control and piezoceramic sensors and actuators offer a viable approach for vibration suppression of space structures. (MM)

Descriptors :   *VIBRATION, *SPACECRAFT, *TRAVELING WAVES, *FLEXIBLE STRUCTURES, *ELASTIC WAVES, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, CONTROL SYSTEMS, TRANSFER FUNCTIONS, FINITE ELEMENT ANALYSIS, BEAMS(STRUCTURAL), DISPLACEMENT, DAMPING, THESES, EIGENVALUES, STRUCTURAL RESPONSE, ABSORBERS(MATERIALS), BOUNDARY VALUE PROBLEMS, PIEZOELECTRIC MATERIALS, SPACE STATIONS, BENDING MOMENTS.

Subject Categories : Unmanned Spacecraft
      Manned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE