Semi-Submersible Damping Plates for Heave Motion Control

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Solution Overview

Problem

Semi-submersible marine structures experience significant heaving, rolling, and pitching motions while floating on the sea, which negatively impact drilling operations by affecting the stability and integrity of installed equipment.

Innovation Solution

The implementation of movement damping plates with a polygonal, circular, or fan-shaped design, featuring vortex inducing holes and reinforced by vertical and radial members, to enhance damping capabilities and structural stability by reducing vortex formation and dispersing external forces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a semi-submersible marine structure floats on the sea, then it can perform drilling operations, but it experiences significant heaving, rolling, and pitching motions that affect equipment stability

Engineering Contradiction:

Improvedrilling operation capabilityVSAvoidequipment stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent converts the harmful vortex flows generated by wave-induced motions into beneficial damping forces. Movement damping plates are installed at the connection between pontoons and columns, where they intentionally generate controlled vortices that create drag forces to counteract the harmful heaving, rolling, and pitching motions, thereby stabilizing the drilling equipment while maintaining drilling operation capability

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Stability of the object's composition

If movement damping plates are installed to reduce vortex formation, then structural stability improves, but device complexity increases

Engineering Contradiction:

Improvestructural stabilityVSAvoiddamping system complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The movement damping system is segmented into multiple independent damping plates installed at different pontoon-column connection points. Each plate operates independently to provide localized damping, allowing the system to achieve overall structural stability through distributed simple components rather than a single complex damping mechanism

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of trying to prevent vortex formation through streamlined shapes, the patent inverts the approach by intentionally designing plates that generate controlled vortices. The vortex-induced drag force is harnessed as a beneficial damping mechanism, converting what would normally be considered a harmful flow phenomenon into a useful stabilizing force

Inventive Principle:

Principle #13The other way round (Inversion)

3Strength

If reinforcing members are added to support movement damping plates, then supporting force at pontoon-column connections improves, but manufacturing complexity increases

Engineering Contradiction:

Improvesupporting force at connectionVSAvoidmanufacturing simplicity

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The movement damping plates are merged with the existing pontoon-column connection structure. The plates are installed within the available space at the connection points and are integrated with the structural members, so that the damping function is added without requiring separate reinforcing structures. This merging approach provides enhanced supporting force while avoiding significant increases in manufacturing complexity

Inventive Principle:

Principle #5Merging (Combining)

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

This configuration efficiently dampens heaving, rolling, and pitching motions, ensuring stable mooring and improved structural support between pontoons and columns, thereby reducing the risk of equipment damage and enhancing operational stability.

Implementation Method 1

A vortex inducing hole is formed in the pair of movement damping plates so as to vertically penetrate the pair of movement damping plates

Methodology Applied

Scientific EffectVortex formation: Vortex Ring

Implementation Method 2

The movement damping part includes a pair of movement damping plates which defines the gap and may be opened along an interior of the horizontal connecting parts

Methodology Applied

Scientific EffectVortex-induced damping: Damping

Data Source

PatentEP3228531B1Marine structure platform having movement damping function and submersible marine structure having same

Publication Date: 2020.04.08 KOREA INSTITUTE OF OCEAN SCIENCE & TECHNOLOGY

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Figure 4(a)~4(d)

AI summary

The present invention provides a marine structure platform including: horizontal connecting parts which are disposed under the seawater and connected to one another in a lattice structure; vertical connecting parts which are installed uprightly at four corners of the horizontal connecting parts and protrude from the seawater; and movement damping parts which are extended at the four corners from the vertical connecting parts along the horizontal connecting parts adjacent to one another, the movement damping parts having a plate shape so as to define a vertical gap therebetween.