Dynamic Stability and Protection Design of a Submarined Floater Platform Avoiding Typhoon Wave Impact

Abstract

This research proposes the design of a mooring system that allows the floating platform to stably dive deep enough to prevent damage induced by typhoon waves. The design principle of the mechanism is that the submarined floating platform with negative buoyancy is connected to a pontoon with positive buoyancy. The diving depth of the floating platform is determined by the rope length. If the static equilibrium of the two forces is satisfied, the diving depth will be kept. If the diving depth of the floating platform is enough, the platform will not be directly damaged by the wave impact. In reality, the system will be greatly subjected to the typhoon wave and the ocean current. The stability of the system and the dynamic tension of the rope must be significantly concerned. In this study, the linear elastic model of the mooring system composed of a floater platform, towed parachute, pontoon, traction rope, and mooring foundation is derived. The theoretical solution of the static and dynamic stability analysis of the mooring system is proposed. The dynamic behaviors of the floating platform and pontoon, and the tension of the rope under the effects of waves and ocean currents, are investigated. It is discovered that the buffer spring helps reduce the tension of the rope. The proposed protection procedure can avoid the damage of the floating platform and the mooring line, due to Typhoon wave impact.

Transient Translational–Rotational Motion of an Ocean Current Converter Mooring System with Initial Conditions

“…It was found that the effects of some parameters on the dynamical stability of the mooring system were significant. Lin and Chen [5] proposed the design of a submarine floating platform-towed parachute-pontoon-traction rope mooring system to prevent damage induced by typhoon waves. The dynamic stability of the in-plane motion of the mooring system possessed three degrees of freedom, and the concentrated mode was investigated.…”

“…There is no discussion in the literature [3,[5][6][7][8] on the transient responses of mooring systems. Therefore, in this study, the transient motion, stability, and rope tension of the ocean current power generation mooring system [8] with initial conditions and hydrodynamic forces and moments are analyzed.…”