Study on vessel–pipe coupling dynamic behavior under regular waves in deep sea mining process

Theoretical and experimental study on dynamic behavior of submarine pipelines under laying operation with articulated stingers is described in this paper. Wave response tests in regular waves and forced oscillation tests in still water were conducted using the 1/20 scale model of 406.4 mm o.d. (16 in. o.d.) pipeline laid in 150 m (500 ft) water depth. The results show that: 1) the maximum dynamic bending moment of pipeline MDmax occur at a stinger roller, 2) dynamic bending moment of pipelines MD at shorter periods are larger than those at longer periods, 3) the values of MD in an over-bend region depend highly upon stinger motion, 4) those of MD in a sag-bend region are less than MD max in an over-bend region, 5) the values of MD/HMY increase as the stinger volume increases and that 6) stinger motion at shorter periods are different from those at longer periods.

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Stochastic Analysis to Truss Spar Platform in Deep Sea

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.477-478.809 ◽

2013 ◽

Vol 477-478 ◽

pp. 809-812

Author(s):

Yan Wang ◽

Rui Gao ◽

Ling Qiang Yang

Keyword(s):

Numerical Method ◽

Deep Sea ◽

Stochastic Analysis ◽

Numerical Results ◽

Model Parameters ◽

Regular Waves ◽

Spar Platform ◽

Truss Spar Platform ◽

Wave Basin ◽

Truss Spar

Truss spar model was tested using regular waves in a wave basin and the responses in surge, heave and pitch were measured. A program was developed to determine the responses using numerical method. This program was run using the model parameters. The results are agreed well with the corresponding results obtained from the test measurements. Then this program was applied to a prototype spar simulated results were compared with the corresponding numerical results and test measurements.

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The Effects of Solid-Liquid Internal Flow on the Dynamic Behavior of a Reduced-Scale Jumper for Deep-Sea Mining

Volume 5: Ocean Space Utilization ◽

10.1115/omae2020-18688 ◽

2020 ◽

Author(s):

Marcio Yamamoto ◽

Tomo Fujiwara ◽

Shigeo Kanada ◽

Masao Ono ◽

Satoru Takano ◽

...

Keyword(s):

Dynamic Behavior ◽

Measurement System ◽

Deep Sea ◽

Forced Oscillation ◽

Internal Flow ◽

Differential Pressure ◽

Scale Model ◽

Flexible Pipe ◽

Visual Measurement ◽

Reduced Scale

Abstract For the exploitation of seafloor massive sulfides, we have investigated the dynamic behavior of the jumper, a piece of flexible pipe that connects the seafloor mining tool to the subsea slurry pump. In this article, we present the results of the experiment using a 1/5 reduced-scale model of the jumper. This experiment was carried out in Deep-Sea Basin. During the experiment, a slurry fluid was conveyed throughout the jumper’s model. In addition, an oscillator generated harmonic motion on the top end of the model. In terms of instrumentation, we installed load cells on the top and bottom ends of the model and a 3D visual measurement system tracked the motion of measurement stations attached to the model. We present the experimental results measured by the 3D visual measurement system, loads cells, and differential pressure gauges in the cases where a vertically forced oscillation is imposed on the top of the jumper. In this experiment, we could observe the effects of slurry on the jumper reduced-scale model. Since the slurry has a larger density than the single liquid phase, the slurry flow changed, as expected, the static shape of the jumper compared to a jumper conveying only water. The vertical top force average and differential pressure average increase with the volume concentration of solid, while their amplitudes increase quadratically with the forced oscillation frequency.

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The Effects of Solid-Liquid Internal Flow on the Dynamic Behavior of a Reduced-Scale Jumper for the Deep-Sea Mining

10.1115/1.0000968v ◽

2021 ◽

Author(s):

Marcio Yamamoto ◽

Tomo Fujiwara ◽

Shigeo Kanada ◽

Masao Ono ◽

Satoru Takano ◽

...

Keyword(s):

Dynamic Behavior ◽

Deep Sea ◽

Internal Flow ◽

Solid Liquid ◽

Reduced Scale

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96/02067 Experiments for dynamic behavior of carbon dioxide in deep sea

Fuel and Energy Abstracts ◽

10.1016/0140-6701(96)88071-4 ◽

1996 ◽

Vol 37 (2) ◽

pp. 139

Keyword(s):

Carbon Dioxide ◽

Dynamic Behavior ◽

Deep Sea

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Analysis of longitudinal coupling dynamic characteristics of deep sea mining vessel and stepped lifting pipe

Scientific Reports ◽

10.1038/s41598-021-98746-7 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

QingHui Song ◽

HaiYan Jiang ◽

QingJun Song ◽

LinJing Xiao ◽

Yu Wang

Keyword(s):

Dynamic Response ◽

Time Domain ◽

Deep Sea ◽

Coupling Effect ◽

Ocean Current ◽

Pipe Length ◽

Coupled Numerical Model ◽

Coupling Dynamic ◽

The Time Domain ◽

Lifting System

AbstractIn deep-sea mining, the coupling dynamic response between the mining vessel and the lifting pipe is a significant problem, which directly affects the structural design of the lifting system and the safety of field operation. The characteristics of coupled motion model have not been fully considered in the existing research. Therefore, this paper uses time-domain coupled numerical model as the research object, considering ocean current, surface wave, pipe dynamics and vessel-pipe contact mechanics, to study the dynamic behavior of the lifting pipe and mining vessel during the process of deep-sea mining using AQWA and OrcaFlex softwares. The response amplitude operator (RAO) is used to compare the measured and simulations dynamic response of the mining vessel. There is a very good agreement in RAO between the experiments and simulations. The coupling simulation results show that the coupling effect has a significant effect on the time domain dynamic response of the lifting pipe, but has little effect on the average effective tension and longitudinal amplitude along the pipe length. The research results of this paper are of great significance to the safety design of deep-sea mining lifting system and the planning of deep-sea operation activities.

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