Floatable Offshore Depot Spar Buoy Stability
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Solution Overview
Problem
Existing offshore structures lack stability independent of mooring systems, effective heave damping, and the ability for quayside integration and transit through shallow waters, while also providing safe and efficient handling of personnel and supplies in harsh marine environments.
Innovation Solution
A floatable offshore depot with a symmetrical buoyant hull, a center of gravity below the center of buoyancy, dynamic movable tendering mechanisms, and wave-damping features, allowing for safe and efficient handling of watercraft and personnel, and integration of a superstructure for offshore operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a floating structure uses conventional hull design and superstructure, then it can support offshore oil and gas operations, but it lacks inherent stability independent of mooring systems and has poor heave damping
Solution Approach 1:
The patent applies the counterweight principle by positioning the center of gravity below the center of buoyancy, creating a stable configuration where the buoyant force and gravitational force are aligned. This inherent stability does not depend on the mooring system, allowing the structure to resist capsizing and maintain upright orientation even in harsh sea conditions.
Solution Approach 2:
The patent changes the geometric parameters of the hull, specifically using a spar buoy design with a long vertical column extending below the water surface. This parameter change increases the waterplane area and modifies the center of buoyancy position, thereby improving heave damping and stability characteristics without adding complex stabilization equipment.
2Object-affected harmful factors
If the natural period of the floating structure is made significantly greater than or less than wave periods, then wave motion coupling is reduced, but the structure becomes more sensitive to other environmental forces
Solution Approach 1:
The patent optimizes the natural period of the floating structure by adjusting the mass and geometric parameters of the spar buoy hull. The long vertical column configuration increases the natural period in the heave direction, effectively decoupling the structure from typical wave periods and reducing wave-induced motion coupling.
3Stability of the object's composition
If the waterplane area is increased to improve stability, then the structure becomes more stable, but heave seakeeping characteristics deteriorate
Solution Approach 1:
The patent resolves this contradiction by changing the vertical distribution of mass and buoyancy rather than simply increasing the waterplane area. The spar buoy design with its long vertical column below the water surface creates a large waterplane area for stability while the vertical geometry provides heave damping through increased added mass and modified hydrodynamic characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides inherent stability, exceptional heave damping, and the capability for quayside integration and transit through shallow waters, enabling safe and efficient handling of personnel and supplies in various marine conditions, including harsh environments.
Implementation Method 1
The buoyant hull includes internal compartmentalization for ballasting and storage
Implementation Method 2
a center of gravity below the center of buoyancy
Implementation Method 3
exceptional heave damping
Data Source
AI summary
A method using a floatable offshore depot to provide sheltered area using a tunnel for safe and easy launching or docking of watercraft and embarkation or debarkation of personnel. The method can be used to transfer equipment between the watercraft and the floatable offshore depot using an internal dock side of the tunnel. The floatable offshore depot can have a buoyant hull, a keel, a main deck, and at least two connected sections between the keel and the main deck. The connected sections can extend downwardly from the main deck toward the keel and can have an upper cylindrical side section, a transition section, and a lower cylindrical section. The method uses the tunnel at an operational depth, with a tunnel opening to an exterior of the buoyant hull to receive the watercraft.