J-Lay Pipeline Model for Coupled Ship-Seabed Wave Response
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Solution Overview
Problem
Existing submarine pipeline laying experiments fail to accurately study the coupling dynamic characteristics of pipe-laying ships, pipelines, and seabeds in deep-water J-lay operations under wave loads, often neglecting hydrodynamic forces, ship motions, and structural similarities, leading to inaccurate and unreliable experimental results.
Innovation Solution
A reduced-scale model experimental device and method that includes a pipe-laying ship model, horizontal mooring mechanism, deep-water pipeline model, pipeline departure angle control mechanism, and seabed simulation mechanism, allowing for accurate measurement of tension changes and six-degree-of-freedom motion responses, ensuring mechanical similarity and integrity of the model.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing model experiments only study static response without considering hydrodynamic forces and ship motions, then the experimental setup is simple, but the accuracy and credibility of experimental results deteriorate
Solution Approach 1:
The patent transforms the static experimental setup into a dynamic one by introducing wave generation devices to create hydrodynamic forces, motion sensors to measure ship responses, and controllable mechanisms to simulate dynamic loading conditions. This allows the experiment to capture time-varying coupling responses between the pipe-laying ship, pipeline, and seabed, significantly improving result credibility despite increased system complexity.
Solution Approach 2:
The patent implements feedback mechanisms through motion sensors that continuously monitor the pipe-laying ship's six-degree-of-freedom motions and pipeline tensions. This real-time data feeds back to the control system, enabling dynamic adjustment of experimental parameters and validation of coupling effects, thereby enhancing measurement accuracy and result reliability.
2Ease of manufacture
If pipeline model simplifies bending stiffness and axial stiffness to improve scale ratio, then the manufacturing ease improves, but the structural similarity between model and real pipeline deteriorates
Solution Approach 1:
The patent carefully selects and adjusts material parameters and geometric dimensions of the pipeline model to maintain structural similarity with the full-scale pipeline. By using materials with appropriate elastic moduli and designing the model with scaled bending and axial stiffness properties, the experiment preserves the mechanical behavior characteristics of the real pipeline while achieving the required scale ratio for water tank experimentation.
3Ease of manufacture
If the pipeline model is cut-off to improve scale ratio, then the ease of manufacture improves, but the integrity of the model deteriorates
Solution Approach 1:
The patent divides the pipeline model into multiple sections that can be separately manufactured and then connected using coupling devices. This segmentation approach allows each section to be produced at the correct scale with proper structural properties, while the connection mechanisms preserve the overall integrity and continuity of the pipeline model, enabling accurate representation of the full-scale system.
4Device complexity
If existing experiments ignore the coupling effect of pipeline, pipe-laying ship and seabed, then the device complexity is reduced, but the ability to reflect coupling dynamic characteristics deteriorates
Solution Approach 1:
The patent designs an integrated experimental system where the pipe-laying ship model, pipeline model, and seabed model function as interconnected components within a unified water tank environment. The wave generation device, motion sensors, and tension measurement systems collectively capture the coupling dynamic characteristics of all three elements, allowing the system to study their interactions under various wave conditions and laying parameters.
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 solution enables true reflection of coupling dynamic responses between the pipe-laying ship, pipeline, and seabed, improving the accuracy and credibility of experimental results by considering bending and axial stiffness, and allowing for precise adjustments of pipeline angles and wave-approach directions, enhancing experimental efficiency and practical engineering support.
Implementation Method 1
the deep-water pipeline model comprises a polypropylene pipe and stainless steel powder in an interior of the polypropylene pipe, a natural form of the deep-water pipeline model is a straight thin cylinder, and the pipeline model naturally bends under the gravity
Implementation Method 2
The pipe-laying ship model floats on a water surface (32)
Implementation Method 3
The horizontal mooring mechanism comprises four horizontal mooring lines formed by sequentially connecting the same thin steel wire (3), spring (4) and nylon cord (5)
Data Source
AI summary
A reduced-scale model experimental device of coupling responses in deep-water J-lay operation is used for studying a coupling response characteristic of a pipeline and a pipe-laying ship in the deep-water J-lay operation under a wave load, a pipe-laying ship model is connected to a center of an adjustable horizontal mooring mechanism, a deep-water pipeline model mainly comprises a polypropylene pipe and stainless steel powder filled in an interior of the polypropylene pipe, two ends of the deep-water pipeline model are respectively connected with the pipe-laying ship model and a seabed simulation mechanism through a pipeline departure angle control mechanism and an anchor end connection mechanism, the device fully ensures a mechanical similarity between the pipeline model and a real pipeline.