舰机协同反潜导航问题研究

文章从目前舰机协同反潜中存在的导航精度不高和抗干扰性差的问题出发,分析了影响反潜导航的因素,提出了应用舰艇编队雷达组网方法提高导航能力的思路。     

兰渝线桐子林隧道岩溶特征及整治方案探讨

文章介绍了兰渝线桐子林隧道施工中揭示的3处岩溶、暗河、岩溶水的发育特征,以及对不同岩溶提出了几种针对性的整治方案,并进行了方案分析、比选探讨.目前隧道施工已穿过岩溶地段,并已取得初步成效,特别是隧道通过后未产生新的水环境问题.     

Modeling and control of the pulley buffer system of arresting cable for shipboard aircraft based on magneto-rheological fluid

Taking the MK7-3 of USA hydraulic buffer arresting device as the research subject, the dynamical model for the shipboard aircraft arresting system is established, and the magneto-rheological (MR) damper is applied to pulley shock absorbers for shipboard aircraft block system. Due to the effect of the MR damper has not been known completely and so far MR damper model has not been defined, we use a set of characteristic test of the MR damper, through the process of parameters identification, to establish the dynamical model for the MR damper based on the Bingham plastic model. Then, the fuzzy control rules are designed, the buffer control for the pulley buffer of shipboard aircrafts is completed in touchdown moment based on MR technology. Compared with blocking device of hydraulic pulley buffer in the same condition, the simulations results show that the proposed MR pulley buffer can effectively recognize the impact energy for shipboard block system and reduce the pull peak of arresting cable. It improves significantly safety during landing of the air vehicles and lowers the risk of accidents.     

Design and evaluation of an integrated inventory and transportation system

This paper proposes the adoption of an integrated inventory and transportation system (IITS) to minimize the total costs of inventory and transportation. A non-linear programing is developed by analyzing transportation and inventory costs with one supplier and many retailers in the distribution environment. The paper compares the proposed model with the traditional approach in computing total costs with numerical data. The results indicate that the total costs can be optimized by adopting integrated programing rather than the traditional approach, along with achieving improved customer service levels. In particular, sensitivity analysis is applied to determine the performance of the IITS under various transportation costs, holding costs and shortage costs. It shows that the transportation cost per unit is most sensitive in the proposed model. In this situation, the IITS is more effective for cost saving when set-up cost, holding and shortage costs are high, but is less effective for situations involving high per-unit transportation costs.     

开拓岸电技术引领绿色水运——连云港岸电技术介绍

为了进一步节能减排，建设绿色港口，连云港在吸取国内外岸电技术成功技术的基础上，开拓了自己的岸电技术。介绍了连云港港岸电技术的由来，其在绿色水运中的意义，技术方案及其优点。阐述了实施该方案需要解决的问题。对中国在岸电方面引领世界的前景进行了展望。     

海上编队信息系统安全防护需求分析

未来海上编队作战对各类信息系统的依赖性越来越强,信息系统也将成为敌对双方攻击的重点,因此编队信息系统的安全问题直接关系到编队指挥控制信息的安全可靠和编队信息化主战武器的性能发挥,影响到编队整体作战能力。文章在对编队信息系统面临的安全威胁和存在的安全风险进行分析的基础上,提出了编队信息系统的安全防护需求,为编队信息系统安全防护系统的构建提供依据。     

钢筋混凝土桥梁耐久性影响因素分析

从钢筋混凝土桥梁的自身构成以及所处环境两方面着手,对其耐久性影响因素进行了分析研究。     

基于模糊PI的冷凝器过冷度控制技术研究

论文简述了冷凝器过冷度产生的原因以及减小过冷度的方法,运用模糊PI的方法设计出冷凝器在不同工况下的过冷度控制器.通过仿真表明,模糊PI控制器较之常规PI控制器,对于冷凝器过冷度的控制性能更好.     

一种基于双闭环控制的并联Buck均流器设计

直驱式永磁同步风电系统电机侧变换器的一种常见拓扑结构为二极管整流桥后接Boost斩波电路。此结构具有较强的非线性,采用普通PI控制器很难使系统在正常运行范围内保持较好动态性能。本文基于双闭环控制方法,设计了基于Buck电路的并联均流器,并进行了相关仿真和试验。     

中美海事院校履约准备的比较

分析中美两国海事院校为实现与STCW'95公约的顺利接轨所进行的履约准备之间的差异，并就海事院校办学宗旨在履约准备及具体履约中的地位提出自己的见解。