Research on Improving the Working Efficiency of Hydraulic Jet Submarine Cable Laying Machine

Abstract

The anchoring and hooking of ships, bedrock friction and biological corrosion threaten the safety and stability of submarine cables. A hydraulic jet submarine cable laying machine manages to bury the submarine cables deep into the seabed, and effectively reduces the occurrence of external damage to the submarine cables. This machine uses a hydraulic jet system to realize trenching on the seabed. However, the hydraulic jet submarine cable laying machine has complicated operation and high power consumption with high requirements on the mother ship, and it is not yet the mainstream trenching method. In this paper, a mathematical model for the hydraulic jet nozzle of the submarine cable laying machine is established, and parameters that affect the trenching efficiency are studied. The effects of jet target distance, flow, angle and nozzle spacing on the working efficiency of the burying machine are analyzed by setting up a double-nozzle model. The results of the theory, numerical simulation and experiment show that the operational efficiency of the hydraulic jet submarine cable laying machine can be distinctly improved by setting proper jet conditions and parameters.

Marine Power Systems

“…Lu et al [7] studied the safety and stability of the anchoring and hooking of ships, bedrock friction, and biological corrosion of submarine cables. A hydraulic jet submarine cable-laying machine manages to bury the submarine cables deep into the seabed and effectively reduces the occurrence of external damage to the submarine cables.…”

“…( 6) This research was supported by the Croatian Science Foundation under project IP-2018-01-3739, CEE-PUS network CIII-HR-0108, European Regional Development Fund under grant KK.01.1.1.01.0009 (DATACROSS), project CEKOM under grant KK.01.2.2.03.0004, University of Rijeka scientific grant uniri-tehnic-18-275-1447, University of Rijeka scientific grant uniri-tehnic-18-18-1146 and University of Rijeka scientific grant uniri-tehnic-18-14. (7) This research was supported by the Key Research and Development Project of Zhejiang Province (2019C03115). ( 8) This research was funded by the National Natural Science Foundation of China (62005204) and the Fundamental Research Funds for the Central Universities.…”

“…The second important thing is the reliability of such systems. As ships and submarine machines [7,8] are far away from available services, their machinery must be reliable in operation. For example, the failure of turbocharger of the standby generator could cause blackout and loss of propulsion [9].…”

Dynamic Interactions of a Cable-Laying Vessel with a Submarine Cable during Its Landing Process

“…9, designed and owned by Zhejiang Qiming Electric Power Group Co. Ltd. (Zhoushan, China). As shown in Figure 1, it is the first 5000 t professional vessel for submarine cable engineering [33]. The vessel is equipped with an advanced cable tray and a clean room for cable connection on site.…”

“…The ship model is established based on the cable-laying vessel Qifan N and owned by Zhejiang Qiming Electric Power Group Co. Ltd. As shown i the first 5000 t professional vessel for submarine cable engineering [33] equipped with an advanced cable tray and a clean room for cable connecti single construction distance for 220 kV voltage level cables can be enhanced f 60.0 km. The eight-point mooring system enables the vessel to resist force 10 w The governing equations are solved in the commercial software Ansy cable-laying vessel is modeled in Design Modeler integrated in Workbenc Figure 2.…”