Jinping Ou
Dalian University of Technology
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Featured researches published by Jinping Ou.
ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering | 2010
Dongsheng Qiao; Changxin Zheng; Binbin Li; Jinping Ou; Gangjun Zhai
In the deepwater exploitation of oil and gas, the replacement of polyester rope for the wire in chain-wire-chain mooring line is proved to be fairly economic. Previous studies are mainly conducted to hydrodynamic analysis and dynamic response calculation, but there are few studies on the fatigue damage analysis of hybrid mooring line. Take the mooring system of a Spar platform as the research object, and the multi-component mooring lines are usually made up of chain-wire-chain. The representative mooring line has been considered while other conditions are kept unchanged, and top end tension-static offset characteristic curve of the two mooring lines are consistent as much as possible, meanwhile the polyester rope is adopted as the substitute for the wire, then the comparative calculation on fatigue damage of deepwater hybrid mooring line is carried on. The analysis of Spar platform response is carried out in which the wave force is calculated under diffraction theory. After the establishment of two-dimensional nonlinear finite element dynamic model of the hybrid mooring line, the calculation on stiffness of the hybrid mooring line is accomplished through the iterative method based on the empirical formula proposed by Del Vecchio in 1992. The mooring line and seabed interaction is based on the hypothesis of rigid seabed. The fluid drag force and inertia force on the mooring line are calculated according to the Morrison formula. The dynamic analysis is executed through time-domain nonlinear finite element method accounting for the response of the Spar platform which is calculated as above. The stress time histories of the hybrid mooring line in each short-term sea state of South China Sea area are calculated, and then the rain flow counting method is employed to obtain the fatigue load spectrum in each short-term sea state. The Miner linear cumulative law model is used to compare the fatigue damage of the hybrid mooring lines in long-term sea state which consists of tens of short-term sea states. The results show that the using of polyester rope as the substitute for the wire can significantly improve the fatigue resistance.Copyright
Journal of Ocean University of China | 2015
Zhe Ma; Yong Cheng; Gangjun Zhai; Jinping Ou
This paper is concerned with the hydroelastic problem of a very large pontoon-type floating structure (VLFS) edged with a pair of submerged horizontal plates, which is a combination of perforated and non-perforated plates attached to the for-end and back-end of the VLFS. For the hydroelastic analysis, the fluid is assumed to be ideal and its motion is irrotational so that a velocity potential exists. The VLFS is modeled as an elastic plate according to the classical thin plate theory. The fluid-structure interaction problem is separated into conventional hydrodynamics and structure dynamics by using modal expansion method in the frequency-domain. It involves, firstly, the deflection of the VLFS, which is expressed by a superposition of modal functions and corresponding modal amplitudes. Then the boundary element method is used to solve the integral equations of diffraction and radiation on the body surface for the velocity potential, whereas the vibration equation is solved by the Galerkin’s method for modal amplitudes, and then the deflection is obtained by the sum of multiplying modal functions with modal amplitudes. This study examines the effects of the width and location of the non-perforated horizontal plates on the hydroelastic response of the VLFS, then the performance of perforated plates is investigated to reduce the motion near the fore-end of the VLFS. Considering the advantages and disadvantages of submerged plates without and with cylindrical holes, we propose a simple anti-motion device, which is a combination of a pair of perforated and non-perforated plates attached to the for-end and back-end of the VLFS. The effectiveness of this device in reducing the deformation and bending moment of the VLFS has been confirmed, and is compared with the results in cases without and with the submerged horizontal plates by the analysis in this paper.
The Twenty-second International Offshore and Polar Engineering Conference | 2012
Tianhui Fan; Dongsheng Qiao; Jinping Ou
Journal of Marine Science and Technology | 2015
Yong Cheng; Gangjun Zhai; Jinping Ou
Shipbuilding : Theory and Practice of Naval Architecture, Marine Engineering and Ocean Engineering | 2014
Tianhui Fan; Dongsheng Qiao; Jinping Ou
Journal of Marine Science and Technology | 2013
Binbin Li; Zhenhua Huang; Ying Min Low; Jinping Ou
Energies | 2016
Kun Liu; Haizhi Liang; Jinping Ou
Ocean Engineering | 2018
Tianhui Fan; Nianxin Ren; Yong Cheng; Chaohe Chen; Jinping Ou
Journal of Marine Science and Technology | 2015
H. Liang; Luyu Li; Jinping Ou
Ocean Engineering | 2018
Nianxin Ren; Zhe Ma; Tianhui Fan; Gangjun Zhai; Jinping Ou