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Automatic Control in Space 1985. Proceedings of the Tenth by France) IFAC Symposium (10th : 1985 : Toulouse, J. P.

By France) IFAC Symposium (10th : 1985 : Toulouse, J. P. Chretien

Provides an authoritative evaluation of the new advancements and technical advances within the functions of computerized keep watch over to house know-how. subject matters lined contain: geostationary satellites, clinical satellites, versatile structures, low earth orbit satellites, orbit and trajectory keep watch over, part expertise, systems, rendez-vous and docking (RVD) and manipulators. includes 39 learn and assessment papers.

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A full NASTRAN free-free model is derived for several configurations of the satellite, correspon­ ding to different orientations of solar arrays and antennae. The method is based on the classical transformation x = <|>q which diagonalyzes the m~ k matrix in the linear system mx* + kx = F obtained by discretization of the structure and linearization of dynamics equations. -Ω 2 0 2 2 , Ω = diag (o^) , 0 B = Table 5 gives the nature and frequency of the first 30 modes of the whole structure, for a satellite configuration with normal vectors of solar arrays being parallel to the bissectrix between the roll and yaw axes and antennae oriented along the yaw axis.

For a m i d d l e s i z e s p a c e c r a f t (13 m w i n g s a n d 2 . 5 m 2 f l a p s ) , t h e p e r f o r m a n c e s a r e s u m m a r i s e d in t a b l e 2 . For t h i s e v a l u a t i o n , t h e d i s t u r b i n g t o r q u e s a r e s u p p o s e d to b e e s t i m a t e d a n d t o b e 90% c o m p e n s a t e d from g r o u n d . D u r i n g e q u i n o x e p e r i o d s , solar p e r t u r b a t i o n s a r e lower and control t o r q u e s are greater than during solstice p e r i o d s because of t h e sun l o c a t i o n in o r b i t a l p l a n e .

G. and is a line one, may be reduced using disturbance rejection techniques. il. b) Active flexible modes control CQntrol_cgncept_descnpitign In the very large field of state feedback control dealing with multi-inputs multi-outputs systems, the following classification may be proposed : . centralized control systems . de-centralized control systems . hierarchical control systems. In the control concepts analysis and selection for a large space structure presented here, the chosen methodology consists in solving the con­ trol problem with a centralized approach, and then analysing the decoupling possibilities.

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