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Study of Several Key Parameters on the Dynamic Analysis of TTR

Author: YangHongBiao
Tutor: HuangYi
School: Dalian University of Technology
Course: Design and manufacture of ships and marine structures
Keywords: Tension Leg Platform Top tensioned risers Nonlinear dynamic analysis
CLC: U661.3
Type: Master's thesis
Year: 2010
Downloads: 85
Quote: 3
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Abstract


Marine riser system is a key component of the system of floating drilling and production of offshore oil and gas, but it is also one of the weak and vulnerable components. The overall power of the riser response is an important factor to affect the platform normal, safe operation, the research focus of the research in this area of ??engineering and academia. This article relying on the State 863 Project \The sexual dynamic analysis methods, and numerical simulation using finite element software ABAQUS / AQUA. Based on a random wave theory, linear superposition of the time-domain simulation of random wave spectrum, and combined according to the results of the random wave time domain simulation target the TLP platform for amplitude response operators (RAOs) calculated vertical swing movement time come TLP platform The course of the curve. At the same time, using time domain calculation method to calculate riser the waves splash zone area and the lower part of the riser in the nonlinear dynamic response of the joint action of the waves, and platform, the riser geometric nonlinearity and large deformation is considered in the calculation. In addition, we also study the target TTR extreme sea conditions in the once-in-a-century power in response to the situation, focus on longitudinal deformation analysis of the equivalent stress level in the riser, the moment, the riser and horizontal deformation. On this basis, the paper further research and analysis of several important parameters affecting TTR nonlinear dynamic response: the top of the tension factor (ttf), TLP platform displacement and ocean currents, and to study the sensitivity of the response of these parameters on the TTR power problems. The analysis results show that: the riser dynamic response influenced by the displacement of the top of the TLP platform level and ttf, and with the increase in the tension of the top of the riser, the deformation of the riser gradually becomes smaller, but the increase of the top tension riser is significantly improved internal equivalent stress. TTR the stress level at the top of the riser, increases with increasing ttf silicon, and the bottom of the stress level is reduced with ttf increase riser system design should be focused on the search for the points of the upper and lower end of the riser stress equilibrium . Engineering applications corresponding to different operating conditions should be set to a different ttf; the platform displacement currents opposition tube power response has a certain impact, which platform displacement affect the wave impact is confined to the riser of the upper part of the wave splash zone, currents have an impact on the whole tube.

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CLC: > Transportation > Waterway transport > Marine Engineering > Ship Principle > Ship dynamics
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