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武钢三烧I系列烧结主厂房为装配式结构,经改造加固形成框架结构和装配式结构共存的复杂结构.由于生产需要,必须从主厂房爆破切割分离43m高的高架通廊,同时需确保贯穿厂房的地下和地表运料通廊及周边厂房的安全.因此,应先采用切割爆破技术,将需保留的高架通廊分离,并把厂房分割成3个区,然后分别采用定向倒塌和拆叠爆破拆除方法,使爆破达到了预期效果,并可供类似工程参考. 相似文献
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本文研究了无侧板单立柱Spar风电平台在不同约化速度(Ur)下的涡激运动特征。基于计算流体动力学进行数值模拟,采用剪应力运输(Shear Stress Transport, SST)k-ω湍流模型模拟漩涡脱落,通过自编动力积分程序和重叠网格实现涡激运动的实时流固耦合,对Ur为2~14时的平台涡激运动响应进行计算,分析涡激运动模式随Ur演变的规律,定性分析物理模型试验不满足雷诺数(Re)相似对涡激运动结果的影响。结果显示:平台分别在Ur=3.5~4.5和Ur=5~10时发生了纵荡和横荡锁频;物理模型试验不满足Re相似,高估了平台所受的黏性力。通过数值计算得出的平台涡激运动特性可为Spar风电平台相关设计分析与试验提供参考。 相似文献
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A numerical model is developed to simulate fully nonlinear extreme waves in finite and infinite water-depth wave tanks. A semi-mixed Eulerian-Lagrangian formulation is adopted and a higher-order boundary element method in conjunction with an image Green function is used for the fluid domain. The boundary values on the free surface are updated at each time step by a fourth-order Runga-Kutta time-marching scheme at each time step. Input wave characteristics are specified at the upstream boundary by an appropriate wave theory. At the downstream boundary, an artificial damping zone is used to prevent wave reflection back into the computational domain. Using the image Green function in the whole fluid domain, the integrations on the two lateral walls and bottom are excluded. The simulation results on extreme wave elevations in finite and infinite water-depths are compared with experimental results and second-order analytical solutions respectively. The wave kinematics is also discussed in the present study. 相似文献
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A hybrid, porous breakwater-Oscillating Water Column(OWC) Wave Energy Converter(WEC) system is put forward and its hydrodynamic performance is investigated using the fully nonlinear, open-source computational fluid dynamics(CFD) model, OpenFOAM. The permeable structure is positioned at the weather side of the OWC device and adjoined to its front wall. A numerical modelling approach is employed in which the interstices within the porous structure are explicitly defined. This permits the flow fiel... 相似文献
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为进一步明确研究方向、理清研究思路,挖掘青年科研人才,国家自然科学基金委员会工程与材料科学部主办了"海洋工程基础研究青年科学家论坛"。近5年来国家自然科学基金资助的青年科学基金项目和答辩类重要项目负责人与会对海洋工程基础研究前沿的科学问题和创新(或特色)的研究思路与方法进行汇报和交流,讨论了大型海上浮式装备、海洋能源利用、船舶工程与系统、国防建设工程四个研究领域中的前沿科学问题,提出了未来五年海洋工程的五个重点研究方向。与会专家学者认为,海洋工程基础研究正从经验性技术走进科学性技术时代。 相似文献