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Design and build of a thruster controlled model of a Large flexible Space Station (LSS)
Keywords: large flexible structures, active vibration control, pneumatic thrusters
(Commenced: 01-Jan-2005,Concluded: 01-Jan-2006)
At the centre of this honours project is the design and build of a model of a large space structure such as the ISS which can be used for the study of adaptive on-line system identification methods and vibration control. The structure currently consists of a large flexible truss; future extensions might incorporate side arms, solar panels, docking bays and/or laboratory cells. An adaptive system identification algorithms is used to allow for structural extensions and modification without having to re-model the entire structure. The vibrations are suppressed using a model predictive control strategy.
Miniature shakers are used to purposely excite the structure to a number of vibrational modes. Two miniature thrusters have been designed and are used as actuators (jet engines); future extensions might consider pneumatically controlled structural members and/or piezo-electric actuators. The latter could also be used to sense the vibrations, thereby eliminating the need for the currently used accelerometers.
The controller has been developped using MATLAB/Simulink. It is presently being converted to a real-time program to be run on a Digital Signal Processing (DSP) board.