浮船坞抱桩系泊装置结构优化设计研究

以提高浮船坞运行效率为前提,针对浮船坞抱桩系泊装置结构展开分析。介绍浮船坞抱桩系泊装置结构,并对其展开受力分析,最后从优化设计思路及方法、结构优化设计两个方面阐述结构优化设计,以期能够设计最佳抱桩系泊装置结构,实现浮船坞的有效运行。     

小变位量弹塑性伸缩缝的ABAQUS有限元分析

应用有限元分析软件ABAQUS对一种新型桥涵伸缩装置-连续式弹塑性伸缩装置进行了应力分析,分析结果表明:在标准荷载下,随着温度的变化该装置应力分布情况良好,材料和结构完全可以满足伸缩量在60mm以下桥涵的使用要求。     

中山轴承厂通过引进技术设备成为我国最好的钢球生产厂

广东中山轴承厂现在是一家专业化生产精密钢球及球轴承的工厂,是国家机械委的定点企业,也是广东省的重点机械企业。该厂1987年新建成精密钢球生产线,全套设备从联邦德国引进,是目前我国引进的最完整的钢球生产线,具有国际先进水平。年产国际标准精度等级5级钢球840吨。目前,国内仅有几个厂家可以小批量生产这种高级钢     

畸变信号下船舶电能计量装置全自动校验系统设计

针对船舶电能计量装置的校验系统在畸形信号下无法自动完成校验的问题,提出畸变信号下船舶电能计量装置全自动校验系统设计。建立船舶电能计量装置在畸形信号下的计量模型,根据模型进行系统硬件的设计,引入畸形信号的自动校验算法并展开计算,完成对提出系统的全部设计。最后,通过仿真实验对设计系统进行客观性仿真测试,证明设计系统能够满足畸形信号下船舶电能计量装置自动校验的要求。     

玻璃钢球鼻首导流罩结构设计

介绍了玻璃钢球鼻首导流罩的结构设计方案流程,重点探讨了球鼻首构架形式设计,并利用MSC-Nastran大型有限元分析软件对导流罩强度和稳定性进行校核计算。结果表明:该方案可以满足声纳导流罩的强度和声学性能要求,为以后进行玻璃钢球鼻首导流罩的设计提供参考。     

虚拟仪器的钢球表面裂纹涡流检测系统

将虚拟仪器技术引入涡流检测中,设计了钢球表面裂纹的涡流检测系统,具有采集、分析、存储和结果显示等功能.该系统便于信号的快速处理,为钢球的快速检测提供了可行的方案.     

曲面快速展开之三角线法

在船舶生产设计中,比如锚台、侧推、曲面开孔等放样下料和工法装备设计中,经常会遇到需要得到曲面展开图的情况,根据放样展开基本原理对AutoCAD编程进行二次开发,实现自动批量求直线实长的功能,可以帮助设计人员较为快速地绘制曲面展开图。在实际应用中,对比原来完全手动展开曲面的方式,可以节省约80%的工作量,并且确保了直线实长的准确性。     

MCR型SVC装置在电渣炉中的应用

MCR型SVC装置兼具动态无功补偿与谐波滤除的功能,在鄂钢电渣炉项目中使用的MSVC装置通过投运前后的电能质量监测对比,证明其优良的无功补偿与谐波滤除功能,完全满足对电渣炉供电的电能质量的要求。随着市场的开拓与技术的进步,MSVC型动态无功补偿装置的前景将会越来越广阔。     

大功率船用整流装置的适配性研究

电力变换装置应用于区域配电系统必须满足区域配电系统的技术要求称为电力变换装置的适配性。本文针对大功率船用整流装置,对其适配性展开了研究,主要包括五方面的内容：安全性要求、任务与功能要求、供电性能要求、结构设计要求、环境要求。研究结果表明船用整流装置要求高可靠、可维护性和高效率,低的发热温升,良好的工作特性以及电磁兼容性。     

一种全回转拖船艏部拖曳系统的设计

通过对拖曳装置设在艏部的防磨缆桥、缆桩和锚绞机进行优化设计,研发一种艏部具有拖曳装置的全回转拖船,在完全不影响顶推作业的基础上,实现了全回转拖船的倒拖功能,增强了拖船的作业功能和灵活性能。     

Testing and analysis of a 6-m steel truss/composite skin hybrid ship hull model

A hybrid ship hull made of a steel truss and composite sandwich skins was investigated experimentally and numerically. A 6-m model was tested under hogging loads, after having previous been subjected to sagging loads. All loads were introduced as shear through brackets welded to bulkheads. The model was loaded to the design load, at which point there was plastic yielding of the steel truss. However, there was no indication of failure in any of the composite sandwich panels, nor in the adhesive bonds between the panels and the steel truss. The steel truss started to yield at lower strains than expected, a fact which was elucidated by manufacturing and testing subcomponents of the steel truss. Nonlinear elastic-plastic finite element analyses were performed on the complete hull. Results from the numerical analyses were compared with data from both sagging and hogging tests and good correlation was found.     

钢-混凝土箱型组合斜拉桥主梁混凝土收缩徐变分析

组合梁斜拉桥兼有混凝土和钢结构的优点,但作为两种材料的结合体,混凝土收缩徐变会引起组合截面的应力重分配,可能促使混凝土裂缝的提前出现或加速裂缝的扩展,从而降低结构的受力性能和耐久性。采用有限元方法分析了混凝土收缩徐变对组合梁斜拉桥主梁应力重分布的影响,并对混凝土的加载龄期的影响进行了参数分析。计算结果表明：混凝土加载龄期越早,组合截面的应力重分布越明显;混凝土收缩徐变对混凝土桥面板的应力影响不大,但对钢梁应力影响较为显著,钢梁的应力增量达到钢材容许应力的30%左右。     

海洋与乡村环境中低碳钢大气腐蚀动力学研究（英文）

In continuation of the extensive studies carried out to update the corrosion map of India, in this study, the degradation of mild steel by air pollutants was studied at 16 different locations from Nagore to Ammanichatram along the east coast of Tamilnadu, India over a period of two years. The weight loss study showed that the mild steel corrosion was more at Nagapattinam site, when compared to Ammanichatram and Maravakadu sites. A linear regression analysis of the experimental data was attempted to predict the mechanism of the corrosion. The composition of the corrosion products formed on the mild steel surfaces was identified by XRD technique. The corrosion rate values obtained are discussed in the light of the weathering parameters, atmospheric pollutants such as salt content & SO2 levels in the atmosphere, corrosion products formed on the mild steel surfaces.     

Flexural fatigue behavior of butt-welded circular concrete-filled double skin steel tube (CFDST)：Experimental study and numerical modeling

Detailed understandings on the fatigue behavior of the concrete-filled double skin steel tubes (CFDSTs) under multiaxial stress states are essential to promote their applications in marine structures. A systematical investigation consisting both the experimental study and the according numerical modeling has been conducted. Physical tests were carried out to investigate the flexural fatigue behavior of the butt-welded hollow steel tubes (HSTs), concrete-filled steel tubes (CFSTs) and CFDSTs, in which the development of fatigue cracks and the fatigue life were captured. The feasibility of applying the existing S–N curves originally obtained from the HSTs to the constitutive steel tubes within the CFDSTs has been consequently verified. A two-stages simulation method was developed to analyze the full range development of fatigue cracks based on both the damage mechanics and the extended finite element method (XFEM). The influence of the multiaxial stress states on the fatigue behavior for the constitutive steel tubes was studied quantitatively, considering the offshore application scenarios where the steel tubes within the CFDSTs were subjected to larger external hydrostatic pressure or internal transmitted content pressure. The results show that the existence of the infilled concrete can effectively improve the fatigue behavior of the steel tubes. The life prediction models for both the fatigue crack initiation stage and propagation stage have been proposed, where the crack initiation life of the steel tube may reduce by 30% when its stress triaxiality increases from 0.36 to 0.48.     

一种新型缓蚀剂对混凝土中钢筋的缓蚀作用

利用线性极化法、失重法、极化曲线、电化学阻抗谱（EIS）等方法,研究了模拟混凝土孔溶液中,一种新型缓蚀剂对钢筋的缓蚀作用和电化学腐蚀行为。结果表明,该缓蚀剂对钢筋具有较好的缓蚀效果;最佳缓蚀剂浓度为2％;该缓蚀剂能有效抑制氯离子对钢筋的腐蚀并对混凝土力学性能无有害影响。其缓蚀作用主要是通过在钢筋表面的竞争吸附形成保护膜从而提高钢筋耐腐蚀性。     

近距空爆载荷下钢板/聚脲复合结构动响应特性仿真

[目的]为探讨聚脲涂层对钢板抗爆性能的提升机制,掌握背涂聚脲层对钢板动响应特性的影响规律,对钢板/聚脲复合结构的抗爆动响应过程进行仿真研究.[方法]采用LS-DYNA软件对钢板/聚脲复合结构在近距空爆载荷作用下的变形/失效过程及吸能机制进行数值仿真,并与文献试验结果进行对比,验证数值仿真方法的合理性和准确性.在此基础上...     

桥墩盖梁加固设计与施工探讨

以实际工程为背景，探讨了体外预应力加固桥墩盖梁的方法，经过优化设计采用钢锚梁进行预应力锚固。介绍了钢锚梁的具体构造，采用土木仿真有限元软件模拟分析，对盖梁混凝土承载能力、正常使用和持久状况应力、钢锚梁强度和稳定性进行研究，研究结果验证了加固措施的合理性，探讨了加固施工工艺。     

基于安全库存管理的钢板采购订单优化

为合理安排钢板采购，有效降低库存占用，开展基于安全库存管理的钢板采购订单（Purchase Order，PO）优化研究。基于钢板采购流程和采购目标，分析钢板安全库存影响因素。根据钢板管理业务流程，阐述钢板安全库存管理流程，对钢板PO进行优化，帮助船厂更好地实现钢板管理。     

A simplified method to efficiently design steel fenders subjected to vessel head-on collisions

Steel fenders have been widely used to protect bridges from vessel collisions because of their relatively large plastic deformability and energy dissipation capacity. In the design of a steel fender, detailed finite element (FE) models are usually employed. However, detailed FE analysis involves complicated modeling and substantial computation time. This method is often not applicable, particularly during preliminary design iterations. For this reason, a simplified analytical method was developed in this paper with the aim to efficiently design steel fenders under vessel collisions. For primary individual members of steel fenders, the deformation mechanisms and models as well as participations during various collision scenarios were discussed in detail. By combining the contributions of primary members, a general analytical procedure was presented to rapidly estimate the force-deformation relationship of steel fenders under various bow impacts. For the fixed and floating steel fenders, several collision scenarios were simulated by FE models to verify the accuracy of the developed analytical method. The crushing resistances and energy dissipation capacities estimated by the developed analytical method were in good agreement with those obtained from the FE simulations. Based on the analytical method, an energy-based design approach was proposed for the efficient design of steel fenders. The developed design approach was demonstrated to be capable of predicting the crush depth and peak impact force of a steel fender with good accuracy.     

港珠澳大桥岛隧工程钢圆筒制造技术

根据港珠澳大桥岛隧工程人工岛护壁钢圆筒直径大、高度高、壁厚薄、体积庞大但径向刚度差的结构特点,结合生产场地条件,确定了钢圆筒上、下分成两段,单段筒体采用垂直分块法分成六片板单元在车间制造,再到外场吊装合拢的总体工艺方案,并分析了制作工艺难点及对策措施。详细介绍了钢圆筒板单元制作,外场拼装焊接,上下段对接合拢,宽榫槽制作安装和转运装船工艺,对今后类似超大直径钢圆筒的制作具有较高的借鉴意义。