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Low-frequency Liner Wave Loads and Motion Response of TLP

Author: CuiYi
Tutor: DongYanQiu
School: Tianjin University
Course: Design and manufacture of ships and marine structures
Keywords: Tension Leg Platform Wave loads Hydrodynamic parameters Vertical swing movement Low-frequency Dual-band incident
CLC: TV139
Type: Master's thesis
Year: 2003
Downloads: 336
Quote: 3
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Abstract


In this paper, the wave loads and movement of the of deep tension leg platform in the waves environment response depth theoretical study. Established a reasonable mathematical model, the computer program to solve a tension leg platform for low-frequency linear wave diffraction of incident and radiation, as well as tension leg platform in the movement under wave action in response to the forecast. Through a series of calculation and analysis, some important conclusions, there is a certain sense of tension leg platforms theoretical research and design calculations. The main contents are as follows: solving role in the platform body wave loads. Simplify the platform body truncated, upright, floating cylindrical base and focuses on the tension leg platform in the dynamic characteristics within the range of the low-frequency (0.1-0.5rad / s). Solving the tension leg platform single column in the wave loads diffraction method is used the expanded characteristic function and method of matched asymptotic to determine the diffraction characteristics of the single-column. Compared to the great characteristics to try to arrive at a simplified calculation method based on the distance between the incident wavelength column. Calculation procedures, in accordance with the above-mentioned theories and methods applied to specific examples which obtained them more intuitive in the practical application of specific results and theoretical analytical solution to verify its feasibility. Problem solving platform body hydrodynamic parameters. In this paper, the eigenfunction expansion and matched asymptotic method to solve a single column to do slight vibration generated radiation velocity potential and obtained the the cylinder load caused by the radiation velocity potential load acceleration and speed-related items were separated on get single column of the added mass coefficient and additional damping coefficient, the hydrodynamic parameters. Calculation program based on this method, applied to specific examples. The tension leg platform motion response study. In this paper, in-depth study of quasi-static and dynamic combination of methods to obtain platform horizontal offset, vertical heave, tension tension leg with tension leg stiffness, the qualitative nonlinear relationship between the initial tension; calculated tension leg platform wave loads and hydrodynamic parameters on the basis of the establishment of the the longitudinal tension leg platform under wave action swing, heave coupled nonlinear equations of motion, and taking into account the nonlinear effects of a tension leg platform. Preparation of the corresponding computer program, get the platform body movement changes over time course curve reveal platforms displacement, vertical swinging movement of the velocity of the incident wave frequency, wave height changes in the law, as well as tension leg platforms weakly nonlinear and strongly nonlinear heave The motion characteristics. lt; WP = 4 gt; analysis has been calculated, the vertical swing the natural frequency of the incident frequency is very low and close to the tension leg platform, the platform will have a huge displacement. The tension leg platform design, the potential threat posed by low frequency waves must be taken into account. Dual-band incident under low-frequency diffraction and radiation problems research methods to explore and prepare for further study on the waves of tension leg platforms load. This paper mainly refer to Kim Yue ring Green function of the free surface boundary element integral method, the low frequency waves generated second-order diffraction and radiation load solving theoretical and research. This paper presents a set of more precise and rigorous theory of dynamic analysis of tension leg platform, the conclusion of a tension leg platform design, calculated to provide a scientific reference, as well as to fill the blank of our in-depth study of the tension leg platform.

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CLC: > Industrial Technology > Hydraulic Engineering > The basic science of water resources project > Hydraulics
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