摘要
To understand the mooring energy during Fositioning, the expressions of four items concerning mooring line energy are presented based on a finite element model, including gravitational and elastic potential energy, kinetic energy and dissipated energy due to mooting-induced damping. In a static case, the force calculated from the derivative of potential energy with respect to distance is compared with that of direct calculation. The results are tbund fit well, which indicates the law of conservation of energy and also shows the correctness of the potential energy results. For the cases of a single mooring line with the attaclunent point oscillating with different amplitudes in horizontal or vertical direction （corresponding to surge and roll motions respectively）, and the case of the mooring line with a horizontal bicbromatic oscillation on the attachment point, the time history of the first three items are calculated and analyzed, also, the indicator diagram tbr mooring-induced damping are given. These results reveal the energy state of the mooring line and can provide a better understanding of how the mooring line works.
To understand the mooring energy during Fositioning, the expressions of four items concerning mooring line energy are presented based on a finite element model, including gravitational and elastic potential energy, kinetic energy and dissipated energy due to mooting-induced damping. In a static case, the force calculated from the derivative of potential energy with respect to distance is compared with that of direct calculation. The results are tbund fit well, which indicates the law of conservation of energy and also shows the correctness of the potential energy results. For the cases of a single mooring line with the attaclunent point oscillating with different amplitudes in horizontal or vertical direction （corresponding to surge and roll motions respectively）, and the case of the mooring line with a horizontal bicbromatic oscillation on the attachment point, the time history of the first three items are calculated and analyzed, also, the indicator diagram tbr mooring-induced damping are given. These results reveal the energy state of the mooring line and can provide a better understanding of how the mooring line works.
基金
supported by the Key Program of the National Natural Science Foundation of China (GrantNo.50639020)
the National High Technology Research and Development Program of China (863 Program,Grant No.2006AA09Z332)
