Catamaran Lifting Frame Articulation for Rough-Sea Stability
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Solution Overview
Problem
Existing catamaran lifting apparatuses face challenges in maintaining stability and flexibility in marine environments with rough seas, particularly when lifting heavy objects, due to the limitations of conventional connections between hulls and frames.
Innovation Solution
The apparatus employs a unique configuration of universal joints and hinged connections between frames and hulls, allowing independent movement and flexibility, with inverted U-shaped frames providing clearance for lifting objects under sea conditions, and utilizing winches and rigging for lifting operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rigid connections are used between hulls and frames, then structural strength is improved, but flexibility and stability in rough seas deteriorates
Solution Approach 1:
The patent applies dynamic connections between frames and hulls, allowing the frames to move independently relative to the hulls through universal joints and hinged connections. This enables the lifting apparatus to adapt to wave action and maintain stability in rough seas while preserving structural strength for heavy lifting operations.
2Force
If frames are rigidly attached to hulls, then lifting capacity is improved, but ability to accommodate wave action deteriorates
Solution Approach 1:
The lifting apparatus employs dynamic connections where frames can pivot and move independently on the hulls through universal joints and hinged connections. This maintains full lifting capacity while allowing the structure to accommodate wave action, improving reliability in rough marine environments.
Solution Approach 2:
The patent divides the lifting apparatus into separate movable segments (frames) that can independently move relative to the hulls. This segmentation allows each frame to respond independently to wave forces while maintaining the overall lifting capability of the apparatus.
3Device complexity
If single barge configuration is used, then device simplicity is improved, but stability for heavy lifting deteriorates
Solution Approach 1:
The patent transitions from a single barge configuration to a catamaran configuration with two separate hulls. This segmentation provides inherent stability for heavy lifting operations while maintaining relative simplicity through the use of standard hull forms and modular frame structures.
Data Source
AI summary
A catamaran lifting apparatus is disclosed for lifting objects in a marine environment. The apparatus includes first and second vessels that are spaced apart during use. A first frame spans between the vessels. A second frame spans between the vessels. The frames are spaced apart and connected to the vessels in a configuration that spaces the vessels apart. The first frame connects to the first vessel with a universal joint and to the second vessel with a hinged connection. The second frame connects to the second vessel with a universal joint and to the first vessel with a hinged or pinned connection. Each of the frames extends upwardly in an inverted u-shape, providing a space under the frame and in between the barges that enables a marine vessel to be positioned in between the barges and under the frames.