| Summary: | 碩士 === 國立交通大學 === 控制工程系 === 82 === It has been known that Taiwan will launch the first satellite,
ROCSAT-1, in the ionosphere orbit in 1997. Many instruments and
devices will be set in the satellite. However, it is
unavoidable that the temperature of environment changes very
much. To assure the instruments work normally, a temperature
control system is needed. Temperature control systems adopted
in the satellite are usually classified into passive system
and active system. An active temperature control system using
heaters is proposed in this thesis. Two major steps are
proposed for design the system: one is to develop the modeling
system which can simulate the thermal conduction and radiation
effects of an empty cubic instruments; and the other one is
using the developed models to design a temperature control
system. Since the temperature model is nonlinear, a system
identification technique is applied to approximately linearize
the system. Furthermore, a linear quadratic regulator theory is
used here to design a bang-bang controller. Simulation results
show that the system is stable and the performance is good.
Finally, we estimate the error for providing the guidance for
arranging the heater-positions.
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