Segmented Aquaculture Pen Floatation Assembly for Storm Resistance
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Solution Overview
Problem
Current open sea fish pens are vulnerable to storms and dynamic ocean conditions, leading to structural fatigue and joint failures, and face challenges with buoyancy and stability issues, limiting their geographical deployment and operational efficiency.
Innovation Solution
An aquaculture pen design featuring an annular floatation assembly with connected float platforms and flexible joints, a weight ring suspended by tension members, and a mesh enclosure with a net support ring, allowing for submergence and improved stability through adjustable buoyancy and spoke cables to distribute stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standard surface pen with buoyancy ring is used, then the structure is simple and cost-effective, but it cannot withstand storms and wave action, requiring protected bay locations
Solution Approach 1:
The floatation assembly is divided into multiple individual float platforms (typically 6-8) connected by flexible joints, rather than using a single rigid buoyancy ring. This segmentation allows each component to independently absorb and distribute wave forces, preventing catastrophic failure during storms while maintaining structural integrity
Solution Approach 2:
The float platforms are connected by flexible joints that allow relative motion between components. This dynamic connection enables the structure to adapt to wave action and storm conditions, transforming static rigidity into dynamic flexibility that dissipates energy and prevents structural failure
2Strength
If float platforms are connected with rigid joints, then structural strength is improved, but stress concentration causes joint failures and fatigue under wave action
Solution Approach 1:
Flexible joints connect the float platforms, allowing controlled movement and stress distribution. These flexible connections prevent stress concentration that would occur with rigid joints, distributing wave-induced forces throughout the entire structure and preventing fatigue failures at connection points
3Device complexity
If the floatation assembly uses fixed buoyancy, then structural stability is simplified, but it cannot adapt to variable ocean conditions and wave action
Solution Approach 1:
The floatation assembly transitions from fixed buoyancy to dynamic adaptability through flexible joints between float platforms. These joints allow the structure to naturally adjust its configuration in response to varying wave conditions, current strength, and storm intensity, providing environmental adaptability without complex control systems
4Ease of manufacture
If a traditional HDPE buoyancy ring is used, then manufacturing is simple and cost-effective, but the structure experiences fatigue and requires periodic replacement
Solution Approach 1:
The single HDPE ring is segmented into multiple independent float platforms. This segmentation distributes mechanical stresses across multiple components rather than concentrating them in one continuous structure, reducing fatigue accumulation and extending the overall system lifespan while maintaining manufacturing simplicity
Solution Approach 2:
The modular float platform design enables individual components to be replaced independently when worn or damaged. Rather than replacing the entire buoyancy ring system, only the affected float platforms need to be swapped out, reducing maintenance costs and downtime while extending operational lifespan
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
Enhances the durability and stability of fish pens by distributing stress and fatigue across replaceable components, enabling operation in areas with occasional storms and improving the overall system design for better resistance to wave action and variable buoyancy.
Implementation Method 1
An aquaculture pen design featuring an annular floatation assembly with connected float platforms and flexible joints
Implementation Method 2
a weight ring suspended by tension members, and a mesh enclosure with a net support ring
Data Source
AI summary
An aquaculture pen includes an annular floatation assembly formed from a plurality of float platforms connected end to end. A weight ring is suspended from the floatation assembly by a first plurality of tension members at a central portion of the float platforms. A net support ring is suspended from the floatation assembly by a second plurality of tension members that are attached to the floatation assembly, for example, outboard of the first plurality of tension members. A mesh enclosure for the pen includes a main portion attached to the net support ring, a jump net portion that extends from the net support ring to engage the inboard side of the floatation assembly, and a top portion that closes an upper end of the mesh enclosure.