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Multiparameter Numerical Investigation of Two Types of Moving Interactions Between the Deep-Sea mining Vehicle Track Plate and Seabed Soil:Digging and Rotating Motions

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China Ocean Engineering 2024年第3期38卷 408-423页

作者： SUN Peng-fei LYU Hai-ning yang jian-min XU Zhi-yong State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Yazhou Bay Institute of Deepsea SCI-TECH Shanghai Jiao Tong UniversitySanya 572024China Institute of Marine Equipment Shanghai Jiao Tong UniversityShanghai 200240China

To ensure the safe performance of deep-sea mining vehicles(DSMVs),it is necessary to study the mechanical characteristics of the interaction between the seabed soil and the track *** rotation and digging motions of the track plate are important links in the contact between the driving mechanism of the DSMV and seabed *** this study,a numerical simulation is conducted using the coupled Eulerian–Lagrangian(CEL)large deformation numerical method to investigate the interaction between the track plate of the DSMV and the seabed soil under two working conditions:rotating condition and digging ***,a soil numerical model is established based on the elastoplastic mechanical characterization using the basic physical and mechanical properties of the seabed soil obtained by in situ ***,the soil disturbance mechanism and the dynamic mechanical response of the track plate under rotating and digging conditions are obtained through the analysis of the sensitivity of the motion parameters,the grouser structure,the layered soil features and the soil *** results indicate that the above parameters remarkably influence the interaction between the DSMV and the seabed ***,it is important to consider the rotating and digging motion of the DSMV in practical engineering to develop a detailed optimization design of the track plate.

关键词： deep-sea mining vehicle rotating motion digging motion track plate-seabed soil interaction CEL numerical method

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基于近场动力学的含损伤缺陷Q345钢裂纹扩展分析

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船舶力学 2024年第1期28卷 103-114页

作者：李双吕海宁黄小华杨建民上海交通大学海洋工程国家重点实验室上海200240 上海交通大学三亚崖州湾深海科技研究院海南三亚572000 广西大学防灾与结构安全教育部重点实验室南宁530004

船舶与海洋工程结构中由于材料本身缺陷或服役过程中产生的细小裂纹,使结构不可避免地产生裂纹损伤,造成应力集中而破坏。为了研究含裂纹缺陷低合金钢构件的裂纹扩展行为,以应用广泛的Q345钢为研究对象,基于近场动力学(Peridynamics,PD... 详细信息

船舶与海洋工程结构中由于材料本身缺陷或服役过程中产生的细小裂纹,使结构不可避免地产生裂纹损伤,造成应力集中而破坏。为了研究含裂纹缺陷低合金钢构件的裂纹扩展行为,以应用广泛的Q345钢为研究对象,基于近场动力学(Peridynamics,PD)理论提出一种改进的双参数PD方法。首先考虑PD力的非局部长程力特性,推导对应的键刚度系数;其次,根据含裂纹缺陷Q345钢拉伸破坏的线性和非线性的力学行为,构建双参数PD本构力函数的基本形式。通过研究不同双裂纹间距、长度和角度的Q345钢裂纹扩展行为,与试验结果对比验证本文改进的双参数PD方法的准确性,并且给出交变荷载情形下疲劳裂纹扩展的计算方法。结果可为船舶钢构件的优化设计和断裂预防提供参考。

关键词： Q345钢近场动力学裂纹扩展损伤断裂受拉破坏

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Dynamic Positioning Capability Analysis for Marine Vessels Based on A DPCap Polar Plot Program

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China Ocean Engineering 2018年第1期32卷 90-98页

作者： WANG Lei yang jian-min XU Sheng-wen State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Shipand Deep-Sea Exploration(CISSE) Shanghai 200240China

Dynamic positioning capability(DPCap) analysis is essential in the selection of thrusters, in their configuration, and during preliminary investigation of the positioning ability of a newly designed vessel dynamic positioning *** analysis can help determine the maximum environmental forces, in which the DP system can counteract in given headings. The accuracy of the DPCap analysis is determined by the precise estimation of the environmental forces as well as the effectiveness of the thrust allocation logic. This paper is dedicated to developing an effective and efficient software program for the DPCap analysis for marine vessels. Estimation of the environmental forces can be obtained by model tests, hydrodynamic computation and empirical formulas. A quadratic programming method is adopted to allocate the total thrust on every thruster of the vessel. A detailed description of the thrust allocation logic of the software program is given. The effectiveness of the new program DPCap Polar Plot(DPCPP)was validated by a DPCap analysis for a supply vessel. The present study indicates that the developed program can be used in the DPCap analysis for marine vessels. Moreover, DPCap analysis considering the thruster failure mode might give guidance to the designers of vessels whose thrusters need to be safer.

关键词： DPCap analysis thrust allocation logic quadratic programming method

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HYDRODYNAMIC INTERACTION BETWEEN FLNG VESSEL AND LNG CARRIER IN SIDE BY SIDE CONFIGURATION

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Journal of Hydrodynamics 2012年第5期24卷 648-657页

作者： ZHAO Wen-hua yang jian-min HU Zhi-qiang State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The Floating Liquefied Natural Gas （FLNG） is a new type of floating platform for the exploitation of stranded offshore oil/gas fields. The side by side configuration for the FLNG vessel and the LNG carrier arranged in parallel is one of the possible choices for the LNG offloading. During the offloading operations, the multiple floating bodies would have very complex responses due to their hydrodynamic interactions. In this study, numerical simulations of multiple floating bodies in close proximity in the side by side offloading configuration are carried out with the time domain coupled analysis code SIMO. Hydrodynamic interactions between the floating bodies and the mechanical coupling effects between the floating bodies and their connection systems are included in the coupled analysis model. To clarify the hydrodynamic effects of the two vessels, numerical simulations under the same environmental condition are also conducted without considering the hydrodynamic interactions, for comparison. It is shown that the hydrodynamic interactions play an important role in the low frequency motion responses of the two vessels, but have little effect on the wave frequency motion responses. In addition, the comparison results also show that the hydrodynamic interactions can affect the loads on the connection systems.

关键词： Floating Liquefied Natural Gas (FLNG) hydrodynamic interactions side by side operation relative motions

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Two New Cytotoxic Sesquiterpenoids from Eupatorium lindleyanum DC.

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Journal of Integrative Plant Biology 2006年第4期48卷 473-477页

作者： Jun Huo Sheng-Ping yang jian Ding jian-min Yue State Key Laboratory of Drug Research Institute of Materia Medica Shanghai Institute for Biological Sciences the Chinese Academy of Sciences Shanghai 201203 China

Two new sesqulterpenold lactones, namely eupallnllides K and L, were isolated from Eupatorlum Ilndleyanum DC. Their structures were determined by spectral methods, Including 1 D-and 2D-NMR spectra. Cytotoxlc evaluatlon showed that eupallnlllde L exhibited potent cytotoxlclty against P-388 and A-549 tumor cell lines with IC50 values of 0.17 and 2.60 p, mol/L, respectively.

关键词： eupalinilides K and L Eupatorium lindleyanum sesquiterpenoid

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Hydrodynamic performance of flexible risers subject to vortex-induced vibrations

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Journal of Hydrodynamics 2013年第1期25卷 156-164页

作者： ZHANG Hui yang jian-min XIAO Long-fei LU Hai-ning State Key Laboratory of Ocean Engineering Shanghai Jiaotong University

The Vortex-Induced Vibration （VIV） displacements are determined from both the measured accelerations and strains in a series of VIV experiments. Based on the results, the forces in the longitudinal, transversal and tangential directions are estimated by using the finite element method with and without considering the interactions between adjacent elements. The numerical simulation indicates that the method considering the interactions performs better in the estimation of the forces. The component of the transversal force in phase with the acceleration is associated with the added mass coefficient. The estimated added mass coefficients take abnormally high values at the locations where the displacements are small. An improved formula based on the L＇Hospital＇s rule is pro- posed to deal with this problem. The results show the advantage of this formula in estimating the added mass coefficients at the loca- tions with small VIV displacements.

关键词： Vortex-Induced Vibration (VIV) flexible risers hydrodynamic force added mass coefficient

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EXPERIMENTAL INVESTIGATION OF EFFECTS OF INNER-TANK SLO-SHING ON HYDRODYNAMICS OF AN FLNG SYSTEM

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Journal of Hydrodynamics 2012年第1期24卷 107-115页

作者： ZHAO Wen-hua yang jian-min HU Zhi-qiang XIAO Long-fei State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The present research focuses on experimentally clarifying the effect of inner-tank sloshing on the hydrodynamics of an Floating Liquefied Natural Gas（FLNG）*** the comparisons of the results obtained from the model tests carried out with the vessel model ballasted with liquid and solid cargo separately,the effects of the inner-tank sloshing on the hydrodynamics of an FLNG system are highlighted and *** languages of the maximum,minimum,mean values and the standard deviations and power density spectra calculated with the help of the algorithm of Fast Fourier Transformation（FFT）are *** is concluded that the effects of the inner-tank sloshing on the responses of the FLNG system are sensitive to wave excitation frequencies,and that the effects of the inner-tank sloshing play an important role,particularly in the roll motion of the FLNG *** outcome of the proposed technique would offer constructive feedback,which can lead to more practical applications and can serve as a reference for the verification of the potential numerical simulations by other researchers.

关键词： Floating Liquefied Natural Gas(FLNG) hydrodynamics sloshing model tests coupled effects

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NUMERICAL AND EXPERIMENTAL RESEARCH ON CURRENT GENERATION IN DEEPWATER OFFSHORE BASIN

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Journal of Hydrodynamics 2007年第5期19卷 551-558页

作者： LU Hai-ning yang jian-min PENG Tao CHEN Gang State Key Laboratory of Ocean Engineering Shanghai Jiaotong University Shanghai 200030

During the design and construction of the deepwater offshore basin, its current generation system is considered to be one of the key technologies. In this article, the state-of-the-art deepwater offshore basin at Shanghai Jiaotong University was examined as a case study. Different 3-D numerical models of the current generation system were developed and calculated. The uniformity of flow field in the basin, such as horizontal and vertical current velocity profiles, were calculated in detail. Besides, a 1 ： 10 scaled model test was also carried out. The current velocities at different locations in the basin were measured and compared with the calculated results. It is concluded that satisfactory agreement can be resulted between the numerical simulation and model test. In addition, it is suggested that transition sections and turning vanes need to be set in inflow and outflow culverts to improve the uniformity of flow field in the basin. And the hydraulic performance of the deepwater current generation system can meet the requirements of model tests in deep water.

关键词： current generation system deepwater offshore basin ocean engineering model test

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NUMERICAL INVESTIGATION ON THE HYDRODYNAMIC PERFORMANCES OF A NEW SPAR CONCEPT

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Journal of Hydrodynamics 2007年第4期19卷 473-481页

作者： ZHANG Fan yang jian-min LI Run-pei CHEN Gang State Key Laboratory of Ocean Engineering Shanghai Jiaotong University Shanghai 200030 China

Recently, the spar platform concept develops quickly in the offshore oil and gas exploitations, especially in deep and ultra-deep water, owing to its benign motion performance, excellent stability and adaptation to wide range of water depth. Many new spar concepts have been put forward with the purpose of reducing fabrication difficulty and cost, while meeting the requirements of exploitation in the meantime Based on the aims mentioned above, a new spar concept was presented in this article and its hydrodynamics both in operating and survival conditions was studied by means of numerical simulation. Basic model tests were also conducted to calibrate the numerical approach. Following aspects are highlighted：（1） new spar concept, （2） global performance of the spar concept and （3） mooring line analysis.

关键词： spar platform time-domain coupled analysis hydrodynamic performances

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COUPLING EFFECTS FOR CELL-TRUSS SPAR PLATFORM: COMPARISON OF FREQUENCY-AND TIME-DOMAIN ANALYSES WITH MODEL TESTS

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Journal of Hydrodynamics 2008年第4期20卷 424-432页

作者： ZHANG Fan yang jian-min LI Run-pei CHEN Gang State Key Laboratory of Ocean Engineering Shanghai Jiaotong University Shanghai 200030 China

For the floating structures in deepwater, the coupling effects of the mooring lines and risers on the motion responses of the structures become increasingly significant. Viscous damping, inertial mass, current loading and restoring, etc. from these slender structures should be carefully handled to accurately predict the motion responses and line tensions. For the spar platforms, coupling the mooring system and riser with the vessel motion typically results in a reduction in extreme motion responses. This article presents numerical simulations and model tests on a new cell-truss spar platform in the State Key Laboratory of Ocean Engineering in Shanghai Jiaotong University. Results from three calculation methods, including frequency-domain analysis, time-domain semi-coupled and fully-coupled analyses, were compared with the experimental data to find the applicability of different approaches. Proposals for the improvement of numerical calculations and experimental technique were tabled as well.

关键词： cell-truss spar time-domain coupled analysis model test coupling effects

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