基于大数据分析的AIS虚拟航标布设技术

为了进一步改善长江下游重点航段的航标布设方案和航路航法，完善通航环境，探索一种基于大数据分析辅助船舶自动识别系统(AIS)虚拟航标布设优化的方法，并以密集港区临港侧航道、深水复合航道和主航道到港口“最后一公里”航道为例进行应用分析。结果表明，基于电子航道图，针对船舶交通流的船舶轨迹回放、碰撞危险度分析、船舶轨迹线分析、航道门线分析和船舶航标间距分析等方法能够以可视化的手段有效地找到航标布设方案的薄弱位置，为AIS虚拟航标的增设优化提供有力的数据支撑。     

基于磁记忆管道应力检测信号仿真和实验研究

为了研究应力对磁记忆信号的影响，建立了力磁耦合模型，利用磁导率作为中间量建立磁记忆信号和应力之间的耦合关系。利用有限元法仿真了管道在不同管径、不同壁厚以及不同内压情况下应力集中区的磁记忆信号特征的影响规律，进行了不同内压下磁记忆信号采集实验。研究结果表明：管道的壁厚、管径以及内压都会影响应力集中区的应力，进而使得磁记忆信号发生了变化。     

燃料电池系统故障诊断识别策略发展

燃料电池系统是一个具有多输入输出变量的非线性系统，为了及时、准确地诊断出燃料电池系统中的故障，保证燃料电池系统的正常工作和安全运行，本文阐述了燃料电池系统的故障类型及影响，主要从电池系统故障诊断识别方法进行简要论述，为故障诊断识别策略的开发提供了方向。     

Ultimate strength analysis of composite stiffened panels based on multi-scale approach北大核心CSCD

［Objectives］As composite materials have varied internal structures, an in-depth analysis of the damage mechanisms of their component materials can provide a research foundation for the ultimate strength analysis of composite stiffened panels. ［Methods］The microscopic, mesoscopic and macroscopic mechanical analyses of marine glass fiber reinforced plastic (GFRP) composite stiffened panels are carried out using a multi-scale approach. Microscopic and mesoscopic representative volume element (RVE) models of chopped strand mat (CSM) and woven roving (WR) materials are established, and the macroscopic equivalent stiffness is obtained by homogenizing the RVE models. The ABAQUS VUMAT subroutine is used to code the progressive damage evolution model of the composite materials to derive the damage evolution mechanism of the microscopic and mesoscopic models respectively. The equivalent strength of macroscopic laminates is also obtained. ［Results］The multi-scale approach can be used to accurately evaluate the macroscopic mechanical properties of composite materials, and the ultimate strength of composite stiffened panels is mainly determined by fiber bundle failure. ［Conclusions］The obtained macroscopic material parameters can be used to calculate the ultimate strength of composite stiffened panels, while the parametric study of the mesomechanics of composite materials can provide an analysis tool for investigating the influence of material processing technology. © 2023 Chinese Journal of Ship Research. All rights reserved.     

独塔混合梁斜拉桥总体设计及关键技术研究

以一座独塔柱混合梁斜拉桥为工程背景,大桥具有结构不对称度高、钢混结合段受力复杂、斜拉索锚固方式多样、抗震烈度高等设计特点和难点,通过采用UHPC混凝土、PSB930高强螺纹钢筋、低回缩锚具新型材料,采用综合调索方法、有限元分析方法、抗震措施等技术手段,采用预应力二次张拉施工工艺,科学地解决了独塔混合梁斜拉桥的多项关键技术难题,达到结构受力合理、安全可靠的目的,为同类型桥梁设计与研究提供了思路。