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 review of the new advancements and technical advances within the purposes of computerized keep an eye on to house expertise. subject matters coated contain: geostationary satellites, clinical satellites, versatile structures, low earth orbit satellites, orbit and trajectory keep watch over, part know-how, systems, rendez-vous and docking (RVD) and manipulators. includes 39 learn and overview papers.

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Extra info for Automatic Control in Space 1985. Proceedings of the Tenth IFAC Symposium, Toulouse, France, 24–28 June 1985

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7. Main effects of reflector deformations on RF detection CONTROL CONCEPTS ANALYSIS AND SELECTION Control Concepts Classification The flexible structures control may deal with three classes of problems : . attitude control in presence of structural flexibilities, . vibrations attenuation or active control of flexible modes, . shape control. For a large geostationary relay satellite, this corresponds to three classes of control concepts : . S. S. ), . S. and eventual specific sensors or actuators, .

5 m2 S = 13 m2 of solar a r r a y s efficiency loss COURSE S OMSORENOEMEN T roll angle Fig. 8. t t: i f i l l ; : - s a i l s model due to t h e non linear c h a r a c t e r i s t i c , t h e s a i l s model used is an i t e r a t i v e one. The on-board model form is : CI = Α Ι . γ . Δγ CJ = Β Ι . γ . γ + A3. Δγ + + loss capability SOLAR SAILING CONTROL LAWS - r o l l / y a w control solar sailing control laws a r e based on linear control and are achieved by a m i c r o p r o c e s s o r . Sensors, with analogic to digital c o n v e r t o r s , p r o ­ vide roll and yaw informations to microprocessor ; digital network and s a i l s model p r o v i d e north and south m o t o r ' s o r d e r s with digital to analogic convertors (see fig.

B e n d i n g /Y Sym. b e n d i n g /Y A n t i . t o r s i o n /X The s e c o n d sym. b e n d i n g normal t o p l a n e The second a n t i . b e n d i n g normal t o p l a n e Sym. b e n d i n g /Z Sym. b e n d i n g /Y A n t i . b e n d i n g /Y A n t i . b e n d i n g /Z A n t i . t o r s i o n /Z Sym. t o r s i o n /Z Sym. l o n g i - a x i s y m m e t r i c Anti. longi-axisymmetric A n t i . b e n d i n g /Y Sym. b e n d i n g /Y Sym. b e n d i n g /X A n t i . M. M. J ί Reflectors + ) f l e x i b l e booms )3 3 ' 1 TABLE 5 First 30 Flexible Modes of the Whole Structure Flexible Modes Analysis A physical analysis of the flexible modes, before using mathematical tools of model reduction and control law computation, is quite necessary or at least wery useful for control design.

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