Active Heave Compensation Damping Control for Offshore Cables
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Solution Overview
Problem
Offshore fossil fuel exploration vessels face challenges in maintaining payload stability due to wave-induced movements, which can damage equipment connected via cables, leading to reduced uptime and productivity.
Innovation Solution
An active damping control system that uses sensors and actuators to adjust cable tension dynamically, modeling vessel and cable dynamics to attenuate movements caused by waves, wind, and other environmental factors, thereby protecting the payload from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the cable length is increased to reach deeper water, then the exploration capability is improved, but the cable tension fluctuations and payload damage risk increase
Solution Approach 1:
The active heave compensation system performs preliminary actions by continuously adjusting cable tension through the winch mechanism before harmful wave-induced forces can damage the payload. The control system anticipates and counteracts vessel motion effects, maintaining stable payload positioning despite increased cable length and deeper water operations.
Solution Approach 2:
The system dynamically changes the cable tension parameter in real-time to compensate for wave-induced vessel movements. By actively modulating the tension force through the damping control system, the patent maintains stable payload conditions even with longer cables in deep water, transforming the static cable into a dynamically controlled element.
2Reliability
If active heave compensation is implemented to reduce payload movement, then payload protection is improved, but system complexity increases
Solution Approach 1:
The control system integrates multiple functions into a unified active heave compensation platform. It simultaneously performs vessel motion sensing, cable tension control, payload position maintenance, and damping operations through coordinated winch and actuator mechanisms, reducing overall system complexity despite comprehensive payload protection capabilities.
Solution Approach 2:
The system employs feedback mechanisms where sensors monitor vessel motion and payload position, and the control system continuously adjusts cable tension based on this feedback. This closed-loop control achieves reliable payload protection while managing complexity through automated regulation rather than complex mechanical structures.
3Force
If cable tension is increased to support deeper operations, then the payload support capability is improved, but the cable weight and material requirements increase
Solution Approach 1:
The patent transforms the cable from a static structural element into a dynamically controlled component. The active heave compensation system continuously adjusts cable tension to match actual operational needs, allowing lighter cables to provide the same protective effect as heavier static cables would have provided, since tension is applied only when and where needed to counteract wave forces.
Solution Approach 2:
The system replaces the need for heavy, over-engineered static cable structures with a lighter cable配合an active control system. Instead of relying on cable mass and strength alone to withstand maximum wave forces, the patent uses controlled tension application through the winch mechanism, substituting mechanical mass with active control forces.
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 significantly reduces payload displacement and cable tension fluctuations, increasing operational uptime and allowing for the use of lighter cables, thus enhancing productivity and safety in deep-water operations.
Implementation Method 1
an active damping control system... control an actuator to dampen the force applied to the payload by controlling cable tension dynamics
Data Source
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AI summary
A damping control system (120) includes a first sensor (205) configured to detect movement of a vessel (100) and generate a first signal representing the vessel (100) movement and a second sensor (210) configured to detect movement of a cable (115) and generate a second signal representing the cable (115) movement. An actuator (215) is configured to dampen a force applied to a payload (110) during a force event. The force event is at least partially caused by the movement of the vessel (100) and the cable (115). A controller (220) is configured to identify the force event based at least in part on the first and second signals and control the actuator (215) during the force event to substantially dampen the force applied to the payload (110).