Abstract
We only consider the underwater mooring platform (UMP) and the plate moving in the transverse direction, and the plate can be relative to the UMP free rotation. In the case of constant flow rate (U=1 m/s), the effect of different dimensionless plate length (Lp/D) and damping value (c) on the UMP was studied. We get the sample data point set by computational fluid dynamics (CFD) simulation with changing the dimensionless plate length (Lp/D=0.3, 0.5, 0.75, 1.0, 1.25, 1.5) and damping value (c=50, 75, 100, 125, 175, 250, 300 (N × s/m)). The optimal value of the vibration suppression rate is obtained by backpropagation (BP) neural network and genetic algorithm. The optimal vibration suppression rate is Py=0.9878 and the corresponding variable value is Lp/D=1.0342, c=57.9631 (N × s/m). In order to verify the accuracy of the optimization, we perform the CFD numerical simulation with the optimized parameters and compare the theoretical optimization results with the CFD simulation result. The absolute error between CFD simulation and optimal Py is only 0.0037. Finally, we compare the results of CFD simulation based on optimal parameter with the bare UMP and analyze their dimensionless amplitude, wake structure, and lift coefficient. It is shown that BP neural network and generic algorithm are effective.
Highlights
The underwater mooring platforms (UMPs) are a class of underwater devices and with an anchor link to work in the sea
This paper shows that computational fluid dynamics (CFD) simulation and the ANN can determine the best value for the refrigerator design
We mainly focus on evaluating the wake structure, force, motion, and the transverse amplitude at different design parameters with a CFD method
Summary
The underwater mooring platforms (UMPs) are a class of underwater devices and with an anchor link to work in the sea. Water quality detection, camera and acoustic communication, and other sensors are installed on the platform. It can be used for marine environmental management, resource protection, disaster monitoring, and marine hydrological monitoring in civil areas, and it can be used for our army surface ships and submarines for remote reconnaissance defense. In order to improve the stability of the UMP, it is very meaningful to study the vibration suppression control technology of UMP. The research on the characteristics of the UMP is mainly focused on the simulation of the anchor chain and the cable, while the research on the stability of the UMP is especially less. Research on the underwater vibration control is mainly concentrated in the field of offshore riser
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