Marine Gate Cable Tension Control via Weighted Closing Line
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Solution Overview
Problem
Existing marine barrier systems are cumbersome to install, require manual operation, and have high maintenance requirements due to complex cable management systems, which can lead to safety issues and inefficiencies in opening and closing the gate.
Innovation Solution
A marine security barrier system utilizing two lines or cables with distributed or lumped weight characteristics, combined with RFID sensors and pulley/fairlead systems, to ensure the cable is always under tension and its position is accurately known, allowing for efficient and safe operation of the gate in various environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional manual operation systems are used for marine barriers, then installation and operation is straightforward, but it requires large vessels and results in frequent injury and man overboard situations
Solution Approach 1:
The patent replaces manual mechanical operation with an automated cable-driven system. Winches automatically reel in or pay out cables to open and close the barrier gate, eliminating the need for manual handling and large vessels. The system uses mechanical advantage through pulleys and winches to move the gate with minimal human intervention, thereby improving safety while reducing operational complexity.
Solution Approach 2:
The barrier gate system is designed to operate autonomously through automated winch control. The system can open and close the gate automatically based on control signals, without requiring continuous manual operation. This self-service capability reduces the risk of injury and eliminates the need for large vessels, while the automated control system manages the complexity of operation.
2Reliability
If complex cable management systems are used to enable automated gate operation, then safety and efficiency improve, but maintenance requirements increase
Solution Approach 1:
The cable management system is segmented into modular components including separate winches, pulleys, and cable sections. Each component can be independently accessed, inspected, and maintained. The segmentation allows for easier repair and reduced maintenance complexity compared to a monolithic system, while still providing the reliability needed for automated operation.
Solution Approach 2:
The system incorporates sensors and control systems that provide feedback on cable tension, gate position, and system status. This feedback enables automated monitoring and alerting, allowing maintenance personnel to address issues before they affect operation. The feedback mechanism reduces the need for frequent manual inspections and simplifies maintenance by enabling condition-based service.
3Adaptability or versatility
If cables are made submersible to enable gate operation in various water conditions, then adaptability improves, but cable position control and tension management become more difficult
Solution Approach 1:
The system uses buoyant elements and weighted components to counteract the effects of water pressure and cable weight. Buoyant buoys attached to the barrier gate help keep the cable positioned correctly in the water column, while weighted anchors at the bottom provide tension control. This counterweight mechanism enables the cable to maintain proper position and tension across various water conditions, improving environmental adaptability while managing the complexity through physical principles.
Solution Approach 2:
The patent introduces intermediary components such as pulleys, fairleads, and guide blocks that mediate between the cable and the water environment. These intermediaries help control cable position and tension by guiding the cable through the water column and reducing friction. The intermediary elements simplify the control of submersible cables in various environmental conditions while maintaining system adaptability.
4Strength
If traditional impact cables are used to transfer impact force, then the barrier can arrest vessel motion, but the cables deflect and become difficult to manage and position accurately
Solution Approach 1:
The patent replaces traditional impact cables with a cable system integrated with sensors and control mechanisms. The system uses sensors to detect cable position and tension in real-time, providing precise measurement of cable state during impact events. This substitution enables accurate monitoring of cable position while maintaining the ability to transfer impact forces through the cable system.
Solution Approach 2:
The system incorporates sensors that provide continuous feedback on cable position, tension, and movement. This feedback enables real-time monitoring and control of the cable system during impact events, allowing operators to understand cable position accurately and adjust the system response accordingly. The feedback mechanism resolves the contradiction by providing measurement precision while maintaining impact force transfer capability.
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 system simplifies gate operations, improves reliability, and ensures operators can confidently manage the cable position and tension, reducing maintenance needs and safety risks.
Implementation Method 1
A weight is attached to the closing line for moving a submerged portion of the closing line to the bottom of the body of water
Implementation Method 2
combined with RFID sensors and pulley/fairlead systems
Data Source
AI summary
A marine gate has a buoyant variable length barrier and a cable management system employing two cables or lines. An opening line extends through the barrier to move the barrier from an expanded position (gate is closed) to a retracted position (gate is open) via a winch. A closing line moves the barrier from the retracted position to the expanded position using a winch. A weight is attached to the closing line for moving a submerged portion of the line to the seafloor when the barrier gate is retracted and the closing line is payed out by operation of its winch. The weighted line allows a portion or the entire cable system to be under tension at all times. The resulting cable geometry allows vessel operators confidence in knowing the cable location in the water depths at the gate, whether the gate is fully or partially opened.