Ocean Systems Engineering-An International Journal最新文献_第6页

Dynamic characteristics and fatigue damage prediction of FRP strengthened marine riser FRP加固海洋立管的动力特性及疲劳损伤预测

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Ocean Systems Engineering-An International Journal Pub Date : 2018-03-01 DOI: 10.12989/OSE.2018.8.1.021

A. Islam

{"title":"Dynamic characteristics and fatigue damage prediction of FRP strengthened marine riser","authors":"A. Islam","doi":"10.12989/OSE.2018.8.1.021","DOIUrl":"https://doi.org/10.12989/OSE.2018.8.1.021","url":null,"abstract":"Due to the escalation in hydrocarbon consumption, the offshore industry is now looking for advanced technology to be employed for deep sea exploration. Riser system is an integral part of floating structure used for such oil and gas extraction from deep water offering a system of drill twines and production tubing to spread the exploration well towards the ocean bed. Thus, the marine risers need to be precisely employed. The incorporation of the strengthening material, fiber reinforced polymer (FRP) for deep and ultra-deep water riser has drawn extensive curiosity in offshore engineering as it might offer potential weight savings and improved durability. The design for FRP strengthening involves the local design for critical loads along with the global analysis under all possible nonlinearities and imposed loadings such as platform motion, gravity, buoyancy, wave force, hydrostatic pressure, current etc. for computing and evaluating critical situations. Finite element package, ABAQUS/AQUA is the competent tool to analyze the static and dynamic responses under the offshore hydrodynamic loads. The necessities in design and operating conditions are studied. The study includes describing the methodology, procedure of analysis and the local design of composite riser. The responses and fatigue damage characteristics of the risers are explored for the effects of FRP strengthening. A detail assessment on the technical expansion of strengthening riser has been outlined comprising the inquiry on its behavior. The enquiry exemplifies the strengthening of riser as very potential idea and suitable in marine structures to explore oil and gas in deep sea.","PeriodicalId":44219,"journal":{"name":"Ocean Systems Engineering-An International Journal","volume":"8 1","pages":"21"},"PeriodicalIF":0.9,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45682450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Numerical and experimental investigation on the global performance of a novel design of a Low Motion FPSO 一种新型低运动FPSO整体性能的数值与实验研究

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Ocean Systems Engineering-An International Journal Pub Date : 2018-01-01 DOI: 10.12989/OSE.2018.8.4.427

Cheng Peng, A. Mansour, Chunfa Wu, R. Zuccolo, Chunqun Ji, Bill Greiner, H. Sung

引用次数: 0

Swell description for Bonga offshore Nigeria location 尼日利亚邦加近海位置的详细描述

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Ocean Systems Engineering-An International Journal Pub Date : 2017-12-01 DOI: 10.12989/OSE.2017.7.4.345

Akinsanya Akinyemi Olugbenga, O. Gudmestad, J. Agbakwuru

引用次数: 10

Exploration of power take off in wave energy converters with two-body interaction 两体相互作用波能变换器功率输出的探讨

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Ocean Systems Engineering-An International Journal Pub Date : 2017-06-01 DOI: 10.12989/OSE.2017.7.2.089

Hao Wang, K. Sitanggang, J. Falzarano

引用次数: 7

Design and estimation of a sensing attitude algorithm for AUV self-rescue system AUV自救系统感知姿态算法的设计与估计

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Ocean Systems Engineering-An International Journal Pub Date : 2017-06-01 DOI: 10.12989/OSE.2017.7.2.157

Yi Yang, Shengqiang Shen

{"title":"Design and estimation of a sensing attitude algorithm for AUV self-rescue system","authors":"Yi Yang, Shengqiang Shen","doi":"10.12989/OSE.2017.7.2.157","DOIUrl":"https://doi.org/10.12989/OSE.2017.7.2.157","url":null,"abstract":"2017) Abstract. This research is based on the concept of safety airbag to design a self-rescue system for the autonomous underwater vehicle (AUV) using micro inertial sensing module. To reduce the possibility of losing the underwater vehicle and the difficulty of searching and rescuing, when the AUV self-rescue system (ASRS) detects that the AUV is crashing or encountering a serious collision, it can pump carbon dioxide into the airbag immediately to make the vehicle surface. ASRS consists of 10-DOF sensing module, sensing attitude algorithm and air-pumping mechanism. The attitude sensing modules are a nine-axis micro-inertial sensor and a barometer. The sensing attitude algorithm is designed to estimate failure attitude of AUV properly using sensor calibration and extended Kalman filter (SCEKF), feature extraction and backpropagation network (BPN) classify. SCEKF is proposed to be used subsequently to calibrate and fuse the data from the micro-inertial sensors. Feature extraction and BPN training algorithms for classification are used to determine the activity malfunction of AUV. When the accident of AUV occurred, the ASRS will immediately be initiated; the airbag is soon filled, and the AUV will surface due to the buoyancy. In the future, ASRS will be developed successfully to solve the problems such as the high losing rate and the high difficulty of the rescuing mission of","PeriodicalId":44219,"journal":{"name":"Ocean Systems Engineering-An International Journal","volume":"7 1","pages":"157-177"},"PeriodicalIF":0.9,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43206709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Directing the turning behavior of carp using virtual stimulation 利用虚拟刺激指导鲤鱼的转弯行为

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Ocean Systems Engineering-An International Journal Pub Date : 2017-03-25 DOI: 10.12989/OSE.2017.7.1.039

Cheol-Hu Kim, Dae-Gun Kim, Dae-Gun Kim, Phill-Seung Lee

引用次数: 1

Dynamic response analysis of submerged floating tunnels by wave and seismic excitations 波浪与地震作用下沉浮隧道动力响应分析

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Ocean Systems Engineering-An International Journal Pub Date : 2017-03-25 DOI: 10.12989/OSE.2017.7.1.001

Jooyoung Lee, Chungkuk Jin, Moo-Hyun Kim

{"title":"Dynamic response analysis of submerged floating tunnels by wave and seismic excitations","authors":"Jooyoung Lee, Chungkuk Jin, Moo-Hyun Kim","doi":"10.12989/OSE.2017.7.1.001","DOIUrl":"https://doi.org/10.12989/OSE.2017.7.1.001","url":null,"abstract":"This paper presents the numerical simulation results for the dynamic responses of two types of submerged floating tunnels (SFT) under wave and/or seismic excitations. Time domain simulations are conducted by the commercial program OrcaFlex (OF) and in-house CHARM3D program (CP). The dynamic performances of a short/rigid/free-end SFT section with vertical and inclined mooring lines are evaluated. The SFT numerical models were validated against Oh et al.’s (2013) model test results under regular wave conditions. Then the numerical models were further applied to the cases of irregular waves or seismic motions. The main results presented are SFT surge/heave motions and mooring tensions. The general trends and magnitudes obtained by the two different software packages reasonably agree to each other along with experimental results. When seabed seismic motions are applied to the SFT system, the dynamic responses of SFTs are small but dynamic mooring tension can significantly be amplified. In particular, horizontal earthquakes greatly increase the dynamic tension of the inclined mooring system, while vertical earthquakes cause similar effect on vertical mooring system.","PeriodicalId":44219,"journal":{"name":"Ocean Systems Engineering-An International Journal","volume":"7 1","pages":"1-19"},"PeriodicalIF":0.9,"publicationDate":"2017-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43808971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

A comparative assessment of approximate methods to simulate second order roll motion of FPSOs fpso二阶侧倾运动模拟近似方法的比较评价

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Ocean Systems Engineering-An International Journal Pub Date : 2017-03-01 DOI: 10.12989/OSE.2017.7.1.053

Abhilash Somayajula, J. Falzarano

{"title":"A comparative assessment of approximate methods to simulate second order roll motion of FPSOs","authors":"Abhilash Somayajula, J. Falzarano","doi":"10.12989/OSE.2017.7.1.053","DOIUrl":"https://doi.org/10.12989/OSE.2017.7.1.053","url":null,"abstract":"Ship shaped FPSO (Floating Production, Storage and Offloading) units are the most commonly used floating production units to extract hydrocarbons from reservoirs under the seabed. These \u0000structures are usually much larger than general cargo ships and have their natural frequency outside the wave frequency range. This results in the response to first order wave forces acting on the hull to be negligible. However, second order difference frequency forces start to significantly impact the motions of the structure. When the difference frequency between wave components matches the roll natural frequency, the structure experiences a significant roll motion which is also termed as second order roll. \u0000This paper describes the theory and numerical implementation behind the calculation of second order forces and motions of any general floating structure subjected to waves. The numerical implementation is validated in zero speed case against the commercial code OrcaFlex. The paper also describes in detail the popular approximations used to simplify the computation of second order forces and provides a discussion \u0000on the limitations of each approximation.","PeriodicalId":44219,"journal":{"name":"Ocean Systems Engineering-An International Journal","volume":"7 1","pages":"53-74"},"PeriodicalIF":0.9,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47634143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Tension variations of hydro-pneumatic riser tensioner and implications for dry-tree interface in semisubmersible 液压-气动立管张紧器的张力变化及其对半潜器干树界面的影响

IF 0.9

Ocean Systems Engineering-An International Journal Pub Date : 2017-03-01 DOI: 10.12989/OSE.2017.7.1.021

H. Kang, Moo-Hyun Kim, S. Aramanadka

{"title":"Tension variations of hydro-pneumatic riser tensioner and implications for dry-tree interface in semisubmersible","authors":"H. Kang, Moo-Hyun Kim, S. Aramanadka","doi":"10.12989/OSE.2017.7.1.021","DOIUrl":"https://doi.org/10.12989/OSE.2017.7.1.021","url":null,"abstract":"In real sea environments, excessive dynamic axial tension variations can be exerted on the top-tensioned risers (TTRs) and lead to structural integrity issues. The traditional riser-tension-variation analysis, however, by using parametric formulation is only conditionally valid under certain strict limits and potentially underestimates the total magnitudes of tension variations. This phenomenon is especially important for the long stroke tensioner in dry-tree semisubmersible with larger global heave motion and longer stroke. In this paper, the hydro-pneumatic tensioner (HPT) is modeled in detailed component-level which includes a set of hydraulic and pneumatic components. The viscous fluid frictional effect in the HPT is considered. The main objectives are (i) to develop a detailed tension variation model of the HPT; (ii) to identify the deviations between the conventional parametric formulation and component-level formulation; (iii) to numerically analyze the tension variation of long stroke tensioner in a dry-tree semisubmersible (DTS). The results demonstrate the necessity of component-level formulation for long stroke tensioner in the development of DTS.","PeriodicalId":44219,"journal":{"name":"Ocean Systems Engineering-An International Journal","volume":"7 1","pages":"21-38"},"PeriodicalIF":0.9,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48071173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Suppression of tension variations in hydro-pneumatic riser tensioner by using force compensation control 利用力补偿控制抑制油气立管张紧器张力变化

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Ocean Systems Engineering-An International Journal Pub Date : 2017-01-01 DOI: 10.12989/OSE.2017.7.3.225

H. Kang, Moo-Hyun Kim, S. Aramanadka, HeonYong Kang, K. Lee

{"title":"Suppression of tension variations in hydro-pneumatic riser tensioner by using force compensation control","authors":"H. Kang, Moo-Hyun Kim, S. Aramanadka, HeonYong Kang, K. Lee","doi":"10.12989/OSE.2017.7.3.225","DOIUrl":"https://doi.org/10.12989/OSE.2017.7.3.225","url":null,"abstract":"Excessive dynamic-tension variations on the top-tensioned risers (TTRs) deteriorate the structural integrity and cause potential safety hazards. This phenomenon has become more remarkable in the development of deep-water fields with harsher environmental loads. The conventional prediction method of tension variations in hydro-pneumatic tensioner (HPT) has the disadvantage to underestimate the magnitude of cyclic loads. The actual excessive dynamic tension variations are larger when considering the viscous frictional fluid effects. In this paper, a suppression method of tension variations in HPT is modeled by incorporating the magneto-rheological (MR) damper and linear-force actuator. The mathematical models of the combined HPT and MR damper are developed and a force-control scheme is introduced to compensate the excessive tension variations on the riser tensioner ring. Numerical simulations and analyses are conducted to evaluate the suppression of tension variations in HPT under both regular- and irregular-wave conditions for a drilling riser of a tensioned-leg platform (TLP). The results show that significant reduction of tension variations can be achieved by introducing the proposed system. This research has provided a theoretical foundation for the HPT tension control and related structural protection.","PeriodicalId":44219,"journal":{"name":"Ocean Systems Engineering-An International Journal","volume":"7 1","pages":"225-246"},"PeriodicalIF":0.9,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66503150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11