The length of the connection lines is a critical parameter in the design of the mooring system for gravity-type submersible cages. Research indicates that shorter connection lines can significantly enhance cage stability in wind and waves, but they correspondingly increase the load on the mooring system, requiring a precise balance in both design and operation.
Professional Analysis and Data Support
Through comparative analysis of physical model tests, we have obtained the following key findings:
Improved Motion Response: Under identical wave and current conditions, compared to longer connection lines, shorter lines can reduce horizontal displacement by 37.28% and heave motion by 28.97%, substantially enhancing cage stability in severe sea states.
Changes in Mooring Forces: While shorter connection lines improve stability, they also lead to a significant increase in mooring line tension, demanding higher strength and durability from the mooring materials.
Design Balance Point: The ideal design must find a balance between “ensuring cage stability” and “controlling mooring load.” It is recommended to prioritize shorter connection lines where the designed submersion depth allows, while simultaneously strengthening the specifications of the mooring components.
Practical Recommendations
Connection Line Length Calculation: Calculate the optimal connection line length based on the specific wave period and current velocity of the farming area. It is generally recommended to be 1.2 to 1.5 times the water depth.
Mooring System Upgrade: When employing shorter connection lines, the breaking strength and abrasion resistance of the mooring lines should be correspondingly enhanced. A safety factor of no less than 3.5 is advised.
Routine Management Essentials: Regularly inspect the wear at the connection points between the lines and the cage frame. Establish a mooring system inspection log to record system changes following each major storm event.
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