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Experimental Study of Local Scour Around Four Piles Under Different Attack Angles and Gap Ratios

China Ocean Engineering 2024年第4期38卷 612-624页

作者： LIU Ming-ming tang guo-qiang JIN Xin GENG Shao-yang School of Architecture and Engineering Liaocheng UniversityLiaocheng 252000China Water-Sediment Regulation and Sand Effective Utilization Special Laboratory of Shandong Provincial Education Department Liaocheng UniversityLiaocheng 252000China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China College of Electronic Engineering Chengdu University of Information TechnologyChengdu 610225China College of Energy Chengdu University of TechnologyChengdu 610059China

In an effort to investigate and quantify the patterns of local scour,researchers embarked on an in-depth study using a systematic experimental *** research focused on the effects of local scour around a set of four piles,each subjected to different hydromechanical *** particular,this study aimed to determine how different attack angles—the angles at which the water flow impinges on the piles,and gap ratios—the ratios of the spacing between the piles to their diameters,influence the extent and nature of scour.A comprehensive series of 35 carefully designed experiments were orchestrated,each designed to dissect the nuances in how the gap ratio and attack angle might contribute to changes in the local scour observed at the base of pile *** these experimental trials,a wealth of local scour data were collected to support the *** data included precise topographic profiles of the sediment bed around the pile groups,as well as detailed scour time histories showing the evolution of scour at strategic feature points throughout the test *** analysis of the experimental data provided interesting *** study revealed that the interplay between the gap ratio and the attack angle had a pronounced influence on the scouring dynamics of the pile *** of the key observations was that the initial phases of scour,particularly within the first hour of water flow exposure,were characterized by a sharp increase in the scour depth occurring immediately in front of the *** this initial rapid development,the scour depth transitioned to a more gradual change *** contrast,the scour topography around the piles continuously *** suggests that sediment displacement and the associated sculpting of the seabed around pile foundations are sustained and progressive processes,altering the underwater landscape over *** results of this empirical investigation have significant implications for the design and constructio

关键词： local scour piles gap ratio attack angle

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A Fully Nonlinear HOBEM with the Domain Decomposition Method for Simulation of Wave Propagation and Diffraction

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China Ocean Engineering 2018年第6期32卷 646-654页

作者： JIANG Sheng-chao SHI Ze-hang SONG Chao ZHANG Gui-yong tang guo-qiang School of Naval Architecture State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Department of Civil and Environmental Engineering National University of Singapore Network and Information Center Dalian University of Technology

A higher-order boundary element method(HOBEM) for simulating the fully nonlinear regular wave propagation and diffraction around a fixed vertical circular cylinder is investigated. The domain decomposition method with continuity conditions enforced on the interfaces between the adjacent sub-domains is implemented for reducing the computational cost. By adjusting the algorithm of iterative procedure on the interfaces, four types of coupling strategies are established, that is, Dirchlet/Dirchlet-Neumman/Neumman(D/D-N/N), Dirchlet-Neumman(D-N),Neumman-Dirchlet(N-D) and Mixed Dirchlet-Neumman/Neumman-Dirchlet(Mixed D-N/N-D). Numerical simulations indicate that the domain decomposition methods can provide accurate results compared with that of the single domain method. According to the comparisons of computational efficiency, the D/D-N/N coupling strategy is recommended for the wave propagation problem. As for the wave-body interaction problem, the Mixed D-N/N-D coupling strategy can obtain the highest computational efficiency.

关键词： fully nonlinear boundary element method domain decomposition method wave propagation wave diffraction

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Global Dynamic Responses and Progressive Failure of Submerged Floating Tunnel Under Cable Breakage Conditions

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China Ocean Engineering 2024年第4期38卷 676-688页

作者： ZHOU Xiang-bo QIAO Dong-sheng WANG Ming tang guo-qiang LU Lin OU Jinping State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

The Submerged Floating Tunnel(SFT)relies on a tensioned mooring system for precise *** sudden breakage of a single cable can trigger an immediate alteration in the constraint conditions of the tube,inducing a transient heave response within the structure along with a transient increase in cable tension experienced by adjacent *** more severe cases,this may even lead to a progressive failure culminating in the global destruction of the *** study used ANSYS/AQWA to establish a numerical model of the entire length SFT for the hydrodynamic response analysis,and conducted a coupled calculation of the dynamic responses of the SFT-mooring line model based on Orca Flex to study the global dynamic responses of the SFT at the moment of cable breakage and the redistribution of cable internal *** most unfavorable position for SFT cable breakage was identified,the influence mechanism of cable breakage at different positions on the global dynamic response was revealed,and the progressive chain failure pattern caused by localized cable breakage are also clarified.

关键词： submerged floating tunnel cable breakage global dynamic responses progressive failure

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Quantitative estimation of hourly precipitation in the Tianshan Mountains based on area-to-point kriging downscaling and satellite-gauge data merging

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Journal of Mountain Science 2022年第1期19卷 58-72页

作者： LU Xin-yu CHEN Yuan-yuan tang guo-qiang WANG Xiu-qin LIU Yan WEI Ming Institute of Desert Meteorology China Meteorological Administration.Urumqi 830002China Central-Asia Research Center of Atmosphere Science Urumqi 830002China College of Environment Zhejiang University of TechnologyHangzhou 310014China University of Saskatchewan Coldwater Lab Canmore T1W 3G1Canada Center for Hydrology University of SaskatchewanSaskatchewan S7N 5A2Canada Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjing 210044China

Precipitation, a basic component of the water cycle, is significantly important for meteorological, climatological and hydrological research. However, accurate estimation on the precipitation remains considerably challenging because of the sparsity of gauge networks and the large spatial variability of precipitation over mountainous regions. Moreover, meteorological stations in mountainous areas are often dispersed and have difficulty in accurately reflecting the intensity and evolution of precipitation events. In this study,we proposed a novel method to produce high-quality,high-resolution precipitation estimates in the Tianshan Mountains, China, based on area-to-point kriging(ATPK) downscaling and a two-step correction, i.e., probability density function matching-optimum interpolation(PDF-OI). We obtained 1-km hourly precipitation data in the Tianshan Mountains by merging estimates from the Integrated Multisatellite Measurement(IMERG) product with observations from 1065 meteorological stations in the warm season(May to September) during 2016–2018. The spatial resolution and accuracy of the merged precipitation data greatly increased compared to *** to a cross-validation with gauged observations, the correlation coefficient(CC),probability of detection(POD) and critical success index(CSI) increased from 0.30, 0.50 and 0.24 for IMERG to 0.63, 0.65 and 0.38, respectively, for the merged estimates, and the root mean squared error(RMSE), mean error(ME) and false alarm ratio(FAR)decreased from 0.46 to 0.38 mm/h, 0.06 to 0.05 mm/h and 0.69 to 0.52, respectively. The proposed method will be useful for developing high-resolution precipitation estimates in mountainous areas such as central Asia and the Belt and Road Initiative regions.

关键词： Hourly precipitation Downscaling merging Tianshan Mountains IMERG Area-to-point kriging(ATPK)

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Periodic Solutions and Global Attractivity of an Impulsive Host-macroparasite Model with Delays

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Chinese Quarterly Journal of Mathematics 2012年第2期27卷 301-307页

作者： SHAO Yuan-fu tang guo-qiang College of Science Guilin University of Technology Guilin 541004 China

By using Mawhin continuation theorem,an important lemma and some analysis techniques,sufficient conditions ensuring the existence and global attractivity of positive periodic solutions for an impulsive differential eq... 详细信息

关键词： periodicity attractivity impulsive delays

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Buhlmann-Straub信度模型的估计与检验

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华东师范大学学报（自然科学版） 2008年第5期 59-65页

作者：唐国强华东师范大学统计系

研究了Buhlmann-Straub信度模型的参数估计和随机效应的检验,以及它们的统计性质.参数估计采用两步估计法,用F检验对随机效应进行检验.在两步估计法中,利用正交变换得到了总平均的估计,然后采用拟合常数法得到了方差的估计,并证明了该... 详细信息

研究了Buhlmann-Straub信度模型的参数估计和随机效应的检验,以及它们的统计性质.参数估计采用两步估计法,用F检验对随机效应进行检验.在两步估计法中,利用正交变换得到了总平均的估计,然后采用拟合常数法得到了方差的估计,并证明了该估计是无偏估计.通过残差平方和构造了F检验统计量对是否有随机效应进行检验,并得出了检验的势函数是检验方差的增函数.最后将估计和检验的方法应用到实例中,得到了较好的效果.

关键词： B-S信度模型正交变换拟合常数方差检验

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随机利率双二项风险模型的破产问题

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桂林工学院学报 2007年第2期27卷 285-289页

作者：唐国强华东师范大学统计系

研究了带随机利率的双二项风险模型的破产问题,得到了终极破产概率的上界、描述破产严重程度的破产前盈余分布和破产赤字的联合分布的递推公式,进而得到了终极破产概率、破产前盈余和破产瞬时盈余满足的积分方程.

关键词：双二项风险模型破产概率破产前盈余分布破产赤字分布联合分布

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汇率调整、资本项目开放与跨境资本流动——新兴市场经验对我国的启示

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中央财经大学学报 2017年第4期 104-116页

作者：唐国强王彬中央财经大学经济学院中国石油规划总院中国人民大学国际货币研究所中国工商银行总行投资银行部研究中心

笔者基于37个新兴市场国家数据,通过构建静态、动态面板模型,实证考察了跨境资本流动的内外部驱动因素。实证结果表明,资本项目开放在短期和长期资本流动中分别起到重要但不同的作用;外部国际货币政策调整、外部流动性条件始终是跨境资... 详细信息

笔者基于37个新兴市场国家数据,通过构建静态、动态面板模型,实证考察了跨境资本流动的内外部驱动因素。实证结果表明,资本项目开放在短期和长期资本流动中分别起到重要但不同的作用;外部国际货币政策调整、外部流动性条件始终是跨境资本流动的显著决定因素;新兴市场国家基本面仅在长期跨境资本流动中表现出显著的影响力;随着新兴市场国家汇率机制总体上趋向弹性,汇率调整在跨境资本流动中的作用并不重要。我国的实证结果与新兴市场的相关结论总体上是一致的,但也有部分差异,主要原因是我国在汇率与资本项目开放上的自身特点使得相关结论表现出一定的"中国特色"。从新兴市场跨境资本流动驱动因素的历史经验与实证结果来看,我国在汇率与资本项目制定安排上,未来应当构建更具弹性的人民币汇率形成机制,引导人民币汇率有序调整,对短期跨境资本项目开放更加审慎,由此形成保持国内货币政策独立性、人民币汇率渐进有序贬值与资本项目开放审慎的政策格局。

关键词：跨境资本流动汇率资本项目开放新兴市场

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国产纤维级PPS树脂质量与性能测试

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塑料工业 2012年第B05期40卷 90-93页

作者：唐国强廖斌昊华鸿鹤化工有限责任公司

吴华鸿鹤化工有限责任公司（简称吴华鸿鹤）首套国产化2kt／a纤维级聚苯硫醚（PPS）树脂产业化生产装置已建成投运。围绕PPS树脂的可纺性，较系统地测试了吴华鸿鹤生产的纤维级PPS树脂产品的质量与性能，表明国产纤维级PPS树脂完全可以... 详细信息

吴华鸿鹤化工有限责任公司（简称吴华鸿鹤）首套国产化2kt／a纤维级聚苯硫醚（PPS）树脂产业化生产装置已建成投运。围绕PPS树脂的可纺性，较系统地测试了吴华鸿鹤生产的纤维级PPS树脂产品的质量与性能，表明国产纤维级PPS树脂完全可以替代进口产品满足下游客户纺丝需要。

关键词：纤维级聚苯硫醚树脂质量可纺性

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平动与转动受迫谐振圆柱的水动力特性分析

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振动与冲击 2017年第11期36卷 31-40页

作者：刘名名唐国强吕林滕斌大连理工大学海岸和近海工程国家重点实验室辽宁大连116024

通过求解二维不可压缩黏性流体的Navier-Stokes方程,对低雷诺数下圆柱同时具有周期性旋转和横流向振动的流固耦合问题开展了数值分析研究。重点考察了不同强迫振动频率(f*([0.5,2.0])以及转动与平动之间的相位差(φ=±180°,±120°,±6... 详细信息

通过求解二维不可压缩黏性流体的Navier-Stokes方程,对低雷诺数下圆柱同时具有周期性旋转和横流向振动的流固耦合问题开展了数值分析研究。重点考察了不同强迫振动频率(f*([0.5,2.0])以及转动与平动之间的相位差(φ=±180°,±120°,±60°及0°)下,圆柱结构的受力特性、锁定模式及尾迹涡流场演化特征。数值分析结果表明,在周期性转动和平动的联合激励下,流动过程除存在常规的基本锁定(Primary Lock-in)现象外,还存在非线性准周期锁定(Quasi-periodic Lock-in)现象;旋转运动与横流振动之间的相位差φ对锁定形式及锁定的频率区间有重要影响,对称的正负相位差可导致高度一致或截然不同的锁定形式;两自由度谐振圆柱的水动力系数在锁定条件下会发生明显跳跃,总体上随强迫振动频率的增大而增大;对于特殊的准周期锁定情况,尾迹区内存在涡旋结构的多级次非线性分叉行为,尾涡演化过程遵循准周期特性。

关键词：圆柱旋转振动横流向振动准周期锁定尾涡模式

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