Theory and model tests for the dynamic response of free hanging risers

Patel, M.H.; Jesudasen, A.S.

doi:10.1016/s0022-460x(87)80099-8

Cited by 24 publications

(8 citation statements)

References 4 publications

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“…In this section, as shown in Figure 7, a finite element model using the Orcaflex software is employed to analyse the dynamic behaviour of the pipe during the installation process in time domain. The current velocity profile is obtained by (5), and the type of wave is Airy model. The pipe is modelled by line element with same geometrical features.…”

Section: Orcaflex Simulation Comparisonmentioning

confidence: 99%

“…Both the pipe and marine drilling riser can be viewed as slender marine structures, and many scholars have studied the mechanical behaviours of a slender structure in deep water. Patel and Jesudasen [5] presented a theoretical and experimental investigation of the lateral dynamics of free-hanging marine drilling risers. Gosse and Barsdale [6] established a mathematical model of the riser under working conditions and derived the vibration equation.…”

Section: Introductionmentioning

confidence: 99%

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Quasistatic Nonlinear Analysis of a Drill Pipe in Subsea Xmas Tree Installation

Qin

Liu

Xiao

et al. 2019

Mathematical Problems in Engineering

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To analyse the stress and deformation of a drill pipe during the lowering of a subsea Xmas tree, a mechanical analytical model and equation were established based on Euler-Bernoulli beam theory. The wave phase is selected as one of the variable parameters for analysis of the deformation and stress of the drill pipe. The research results indicate that the maximum response occurs at 0 radians in the scope of 0 to 2π, and the quasistatic nonlinear analysis is analysed at 0. In addition, Orcaflex software is applied for simulation, and the simulation results are compared with the results from proposed method, which demonstrate the model and the method accuracy. Factors that affect the installation process are discussed, such as current velocity, wave height, pipe size, and towing speed. The results show that all factors have remarkable effects on stress and deformation and that the wave height has a lesser effect on the deformation of the drill pipe. The viable towing speed is chosen by discussing the total stress of the drill pipe with various towing speeds and is notably useful for installation in the real sea state.

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Section: Orcaflex Simulation Comparisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quasistatic Nonlinear Analysis of a Drill Pipe in Subsea Xmas Tree Installation

Qin

Liu

Xiao

et al. 2019

Mathematical Problems in Engineering

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“…Details on the vortex excitation can be found in [12,13]. In this article, the Morrison's equation [2,13,14] is used as a disturbance model in Section 5 for simulations. The current profile, similar to that shown in Fig.…”

Section: Effects Of Ocean Currentmentioning

confidence: 99%

“…The full current load is applied from x = 1000m to 700m and thereafter linearly decline to zero at the ocean floor, x = 0, to obtain a depth dependent ocean current profile U (x, t). The distributed external force f (x, t) acting on the riser as a transverse load due to the flow of the current can be modelled using the Morrison's equation [2,13,14] as follows,…”

Section: Simulationmentioning

confidence: 99%

“…The riser can be modelled as an extremely long and flexible tensioned prismatic tube, with nonlinear dynamic response and governed by equations of motions dependent on both space and time. Idealized beam models characterized by partial differential equations (PDE), with various boundary conditions, have been used to investigate and analyze the riser dynamics when subjected to different environmental loads [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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Top angle control and vibration reduction of flexible marine risers

How

Choo

2008

2008 SICE Annual Conference

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In this article, control of the flexible marine riser top angle and the reduction of forced vibration under a timevarying distributed load are considered using boundary control approach. A torque actuator is introduced in the upper riser package and a boundary control law is designed for riser angle control and vibration reduction with guaranteed closed-loop stability. The proposed controller is independent of system parameters, thus possesses stability robustness to variations in parameters. Numerical simulations with a worst case excitation are provided to verify the effectiveness of the approach presented.

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Introduction

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et al. 2014

Dynamics and Control of Mechanical Systems in Offshore Engineering

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Theory and model tests for the dynamic response of free hanging risers

Cited by 24 publications

References 4 publications

Quasistatic Nonlinear Analysis of a Drill Pipe in Subsea Xmas Tree Installation

Quasistatic Nonlinear Analysis of a Drill Pipe in Subsea Xmas Tree Installation

Top angle control and vibration reduction of flexible marine risers

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