Influence of the design constraints on the thickness optimization of glass panes to achieve lightweight insulating glass units in cruise ships

The increasing complexity and size in cruise ships demands for lightweight structures and practical but accurate design methods. Conventionally, the focus has been on the steel parts of the ship, as they make most of its weight. However, the proportions of other materials are increasing. Therefore, this study attempts to provide better understanding how one could reach the lightweight designs of insulating glass units (IGUs) in ships. These are windows where at least two glass panes are separated by a hermetically sealed cavity. They are thin-walled structures that benefit not only from the geometrically nonlinear behavior, but also from the load sharing. Considering these effects, their behavior is studied using the nonlinear Finite Element Method and Particle Swarm Optimization. Different design criteria are imposed on the thickness determination of the glass panes with different shapes. Rectangular, triangular, and circular shapes are considered. The results show that the triangular shapes have the least weight for a given area when the deflection criterion is the dominating one. When maximum principal stress is the thickness defining criterion, the shapes perform almost equally well. The ratio between the pane thicknesses had the most influence on the behavior of the IGU. As it increases, i.e., one pane is significantly thicker than the other, the load sharing percentage drops, but it provides the most lightweight solution. Closer it is to 1, more equally the structural stresses are divided between the panes, i.e., redundancy is achieved. Finally, it is possible to establish a simple but effective method for the thickness determination of these IGUs using the results of this study. However, more work is required, including numerical analysis and experimental testing.     

带限位隔振系统冲击响应分析

为提高舰载设备的抗冲击能力,利用ANSYS中的弹簧间隙单元构建有限元模型,通过仿真计算分析限位器刚度参数对隔振系统抗冲击性能的影响,揭示二次冲击问题产生的原因并给出合理建议。研究结果表明:在任一安装间隙下,随刚度比的增加,被隔振设备的相对位移响应逐渐减小,加速度响应迅速增加,二者呈负相关;二次冲击问题不受传统限位器刚度大小影响,但通过合理选用限位器参数或设计新型大阻尼限位结构可有效改善二次冲击的影响,进而提高舰载设备的抗冲击性能。     

VLCC液压阀门遥控系统布置的设计与优化

为降低VLCC阀门遥控系统的建造成本和液压油泄漏的风险,提高施工质量及使用维护的便捷性,以某30万t VLCC的建造实例为基础,在对该项目液压阀门遥控系统的设计和施工情况进行详细调查分析的基础上,统计现场部分区域的液压油单芯管、卡套穿舱件等附件的物量,提出针对电磁阀箱和液压泵站舱室布置的设计优化方案。在进行修改后发现,可减少总长约1 827.84m的液压油单芯管、204个卡套穿舱件等相关附件的用量,为企业提高建造质量、实现降本增效提供可行性方案。     

全船自动化典型解决方案解析

以系统性的角度对国外引进的全船自动化技术与产品进行剖析。以“海洋石油981”深水钻井平台为例，总结该平台全船自动化解决方案的技术特点与优势，并分别对其装备的子系统包括动力定位控制系统、推进器控制系统、综合导航控制系统、船舶监测与综合控制系统、综合安全控制系统进行单独分析，为国内船舶自动化配套产业发展提供一定的参考。     

多用途船甲板加装固定橇块单元方案

为满足海洋平台的需求，对多用途船甲板加装固定橇块单元。从安装位置、甲板强度计算、稳性要求、电力负荷要求及防爆要求等方面对加装方案进行全面考虑。该方案不仅可缩短货物的灌装时间，而且可提高船舶的周转率，进一步提升船舶的市场竞争力。     

船舶中组立结构机器人焊接工艺参数规划

针对船舶中组立结构机器人焊接工艺参数规划的问题，对设计软件导出的工件及焊缝信息进行处理，构建机器人焊接工艺数据库，对焊缝特征进行智能化识别，完成基于特征的焊缝焊接工艺匹配。机器人焊接工艺参数规划可有效提升复杂情况下的船舶中组立结构焊接程序规划设计效率。     

大型垂直升船机钢丝绳组件安装技术

针对大型垂直升船机钢丝绳组件安装的特点和难点及传统安装方法的不足,提出一种科学实用的升船机钢丝绳组件安装技术及作业方法。采取钢丝绳出绳点精确定位、多绳共槽全卷绕结合绕绳机架等技术措施,解决了钢丝绳组件安装数量多、绳径大、施工场地狭窄、长、短绳多绳共槽卷绕的难题。该技术已在景洪、三峡等升船机工程中得到应用,效果显著。