可调式自由面减摇水舱的实船性能

通过对海洋工程船“新润3” 号的实船测试,获得了减摇水舱开启和关闭两种状态下的船舶横摇数据,比较准确地评估了不同海况下可调式自由面减摇水舱的减摇效果。进一步将实测减摇数据与理论预报结果对比,验证了理论预报方法的有效性和局限性。研究表明,减摇水舱的性能不仅仅取决于自由液面的面积大小和水位高低,也同样受制于舱顶的高度,有必要在设计和预报过程中予以充分考虑。     

国内溢油回收船现状及溢油回收装置选型研究

针对当前海上溢油风险的日益增加,以及防污染对专业溢油回收设备及专业溢油回收船的需求,介绍了目前国内溢油回收船的现状,并对国内外溢油回收装置的特点进行了分析比较,希望为用户在选择溢油回收设备及建设专业溢油回收船方面起到指导作用。     

Dynamic response of a SWATH vessel for installing pre-assembled floating wind turbines

New and efficient installation concepts which can reduce the cost of developing an offshore wind farm are of particular interest. This paper explores a promising concept using the small water-plane area twin-hull vessel (SWATH) to install pre-assembled wind turbines (OWT) onto floating spar foundations. A focus is placed on the hydrodynamic performance of the SWATH and the response analysis of the coupled SWATH-spar system. Firstly, the numerically calculated difference-frequency wave force effect and damping forces of the original SWATH were verified with experimental data. Secondly, the original SWATH was modified to satisfy the criteria of weight-carrying capacity and hydrostatic stability. Thirdly, a multibody numerical model for the SWATH-spar system was developed, in which the hydrodynamic and mechanical couplings between the SWATH and a spar were considered. The SWATH is equipped with a dynamic positioning system to counteract the slow-drift wave force effects. The nonlinear time-domain simulations were carried out for the mating stage when a wind turbine is lifted above the spar foundation. Based on the analysis of statistics of the relative displacement and velocity of the tower bottom and the spar top, the installation concept with SWATH is found to be of decent performance. Finally, recommendations are provided for future research on this concept, which contributes to developing next-generation installation concepts for bottom-fixed and floating wind farms.     

车用锂电池SOC估算法研究进展

文章介绍电池热管理技术(BMS)的一项关键技术即荷电状态(SOC)的几种估算方法及多种方法综合应用。在此基础之上分析了多种方法的综合应用及新型的研究方法、各自方法的优缺点和适用场合。进一步明确了SOC算法的发展趋势,为今后锂电池荷电状态估计方法的创新发展提供了一定的参考。     

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.     

沥青路面预防性养护在辽宁省的研究与应用

介绍了沥青路面预防性养护技术的概念和特点,并从科研项目、实体工程两方面阐述了辽宁省在研究和应用预防性养护技术上取得的成果和经验.     

基于GSM-R网络的SIM卡的研究

首先从GSM—RSIM卡包含的数据文件出发，系统地阐述了GSM—RSIM卡的文件结构，并和GSM SIM卡的文件结构进行了比较；然后将GSM—RSIM卡中的文件归类。在铁路业务的基础上重点研究了GSMR所规定的几个专用基本文件。     

基于铁谱技术的磨损故障组合智能诊断模型的研究

机械设备的磨损对设备故障和使用维护非常重要。基于铁谱技术提出了磨粒识别的灰色关联度模型和BP神经网络模型组合优化识别的方法,试验和应用表明组合模型优于2种单一模型,较大地提高了预测精度。     

基于MATLAB下的PID控制仿真

自动化船舶的机舱设备热工参数的定值控制系统多采用P、I、D的组合控制。文中通过MATLAB软件用于直伺服电机对单位阶跃输入的PID控制进行了动态仿真，显示了不同作用组合和不同增益设置时的动态过程，为系统控制规律的选择和参数设定提供了依据。     

搜救船舶优选和排序的评判方法研究

根据现代决策理论和模糊数学评判方法,用3种多目标选优方法对搜救船舶选优进行探讨:(1)利用多属性决策加权和法进行评判;(2)根据汉明距离结合各指标的满意度曲线和重要度综合评判;(3)用模糊相似优先比方法评判。对各评判方法提出了若干改进措施,使方法更客观、合理。