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Sliding mode thermal control system for space station furnace facility

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2 Author(s)
Jackson, M.E. ; Marshall Space Flight Center, NASA Headquarters, Huntsville, AL, USA ; Shtessel, Y.B.

This paper addresses the decoupled control of the nonlinear, multi-input-multi-output, highly coupled space station furnace facility (SSFF) thermal control system. Sliding mode control theory, a subset of variable-structure control theory, is employed to increase the performance, robustness, and reliability of the SSFF's currently designed control system. This paper presents the nonlinear thermal control system description and develops the sliding mode controllers that cause the interconnected subsystems to operate in their local sliding modes, resulting in control system invariance to plant uncertainties and external and interaction disturbances. The desired decoupled flow-rate tracking is achieved by optimization of the local linear sliding mode equations. The controllers are implemented digitally and extensive simulation results are presented to show the flow-rate tracking robustness and invariance to plant uncertainties, nonlinearities, external disturbances, and variations of the system pressure supplied to the controlled subsystems

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Control Systems Technology, IEEE Transactions on  (Volume:6 ,  Issue: 5 )