Numéro : 2343 - Year : 2000
Aircraft carrier Charles de Gaulle heel compensation: principles and structure of the command laws
Stéphane KUMMER, DCN Direction Technique – PARIS
Georges HARDIER, ONERA Département Contrôle des Systèmes et Dynamique du Vol – TOULOUSE
Claude LAMBERT, ONERA Département Contrôle des Systèmes et Dynamique du Vol – TOULOUSE
To improve the seakeeping performances of the French nuclear aircraft carrier Charles de Gaulle, with respect to its predecessors Clemenceau and Foch, DCN has developed a platform motion control system, called SATRAP, which reduces the ship motions while ensuring navigation capability. This system involves a centralized computer which controls three subsystems: two pairs of stabilizing fins, a set of rudders and a moving-mass system (athwart ship) for heel compensation, the Cogite system. Originally conceived for situations where the stabilizing :fins would be otherwise saturated (steady heel from wind or heavy weights displacements), Cogite has evolved into a system which also improves the operational capability of the ship by limiting the heel during sharp turns, permitting non-stop handling and preparation of aircrafts. This paper presents the results of the studies which led to the development of a performing mode of operation for SATRAP, where the helmsman has full control of the rudders while the fins and Cogite system automatically reduce the ship motions. The following points are discussed in this paper: operational requirements in terms of performances, SATRAP system architecture and principles chosen for the control laws (task allocation for the actuators, feedforward-feedback controllers).
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