Abstract
A well-known limit of air cushion catamarans is the so-called “cobblestone effect”, a resonance phenomenon due to the interaction between the ship body and the air cushion dynamics excited by the incoming waves. In this paper the problem of designing a ride control system for the attenuation of the wave-induced vertical accelerations of a surface effect ship (SES) is considered. It is shown that the damping of the two main resonant modes can be achieved by two independent control loops. Such a decoupled control scheme exploits the intrinsic orthogonality of the two oscillation phenomena, and provides better performances than classical control schemes based on two independent local control loops.
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