A new method for absolute datum transfer in seafloor control network measurement

To decrease the time consumption and the labor intensity in the absolute datum transfer of traditional seafloor control network measurement, a new method, namely sailing-circle positioning method, is put forward in this paper. First, the traditional intersection positioning model is improved by considering the equivalent sound velocity profile error as an unknown parameter in the adjustment model. Second, the effect of geometric dilution of precision (GDOP) on positioning accuracy is analyzed. By seeking for the minimum of GDOP, it is concluded that the absolute datum transfer can achieve the highest accuracy in the condition of sailing along a circle relative to other sailing paths. Moreover, the optimal radius of the circle for the accurate datum transfer is also given out. Besides, the correlation between the accuracy of datum transfer and the sound velocity error in this method is analyzed. Finally, the new method was tested and verified by the experiments in Songhua lake with the water depth of 60 m and in South China sea with the water depth of 2000 m, respectively. These experiment results show that the new method can improve the accuracy and efficiency of traditional datum transfer method significantly.     

LNG码头应急通道与应急锚地研究

本文针对LNG应急逃离情况以及国内LNG应急锚地使用现状,总结分析国内、外LNG应急锚地布置情况;结合江苏滨海LNG码头通航条件,提出LNG应急通道及应急锚地三种布置方案,通过操船模拟试验论证比选并得出结论,供类似工程参考。     

谋划浙江港口发展战略促进交通强国高质量发展

近十年来, 浙江省港口一直呈现快速发展态势, 沿海港口发展位居全球前列, 2019 年宁波舟山港吞吐量 11. 2 亿 t, 连续 11 年位居全球第一, 面对 “十三五” 乃至今后一段时期国际经济与港口发展的新形势, 在交通强国发展总体要求下, 浙江省港口呈现怎样的发展趋势、 采取何种发展战略和发展措施, 值得我们深入思考和探析。     

浙江与韩国铁路的比较研究

浙江与韩国在土地面积、 人口数量、 资源禀赋以及区位条件等多个方面都十分相似， 两者具有很强的可比性。 同时， 两者在经济发展水平以及铁路发展水平等方面也表现出了一定的差距。 文章以铁路运输为切入点， 分别回顾和总结了浙江和韩国两地的铁路发展历程和铁路运输现状。 在充分比较和分析两地铁路发展水平的基础上， 提出了韩国铁路发展对浙江的几点启示： 首先， 浙江应进一步扩大铁路网规模和密度； 其次， 浙江铁路将继续发挥对经济发展的拉动作用， 但随着时间推移拉动效应逐渐减弱； 最后， 浙江应积极探索和制定更为灵活多样的票制票价， 以吸引更多群体类型的旅客选择铁路出行。     

提高TSP探测精度的途径

TSP作为目前最先进的隧道地质超前预报探测仪器，得到了广泛的应用。但是由于在现实中存在各种问题，从而导致该仪器的预测精度受到了极大限制，主要阐述如何提高其预测精度，更好地为隧道的建设服务。     

海难后航海类专业学生心理干预浅析

文章介绍了心理危机和危机干预的概况,重点阐述海难后针对航海类专业学生心理危机的干预实施步骤和实施形式。     

电控转向系统直流电机实时故障诊断方法

作为电动助力转向系统和线控转向系统执行元件的电动机,其可靠运行对电控转向汽车的行驶安全至关重要.本文中通过建立永磁直流电机模型和运用带有遗忘因子的递推最小二乘法,提出了一种电控转向系统直流电机故障诊断方法.线控转向实车试验验证的结果表明,该方法可准确、实时地诊断直流电机故障,为电控转向系统的容错控制奠定基础.     

基于GOOSE机制的城市轨道交通中压环网继电保护方案优化

针对目前城市轨道交通中压环网继电保护存在的问题,提出了基于GOOSE(面向通用对象的变电站事件)机制的中压环网的继电保护优化方案,有效地解决了传统过流保护级差配合困难的问题.该方案是以GOOSE光纤以太网为基础,以闭锁逻辑为核心的数字通信电流保护方案.将GOOSE信号进行分类,并对中压供电环网系统各种可能出现的故障进行动作行为分析.最后,通过RTDS(动态数字仿真系统)仿真试验,证明该方案在各种故障情况下,都能保证继电保护的选择性、速动性、灵敏性和可靠性.     

Modelling,simulation and applications of longitudinal train dynamics

ABSTRACT

Significant developments in longitudinal train simulation and an overview of the approaches to train models and modelling vehicle force inputs are firstly presented. The most important modelling task, that of the wagon connection, consisting of energy absorption devices such as draft gears and buffers, draw gear stiffness, coupler slack and structural stiffness is then presented. Detailed attention is given to the modelling approaches for friction wedge damped and polymer draft gears. A significant issue in longitudinal train dynamics is the modelling and calculation of the input forces – the co-dimensional problem. The need to push traction performances higher has led to research and improvement in the accuracy of traction modelling which is discussed. A co-simulation method that combines longitudinal train simulation, locomotive traction control and locomotive vehicle dynamics is presented. The modelling of other forces, braking propulsion resistance, curve drag and grade forces are also discussed. As extensions to conventional longitudinal train dynamics, lateral forces and coupler impacts are examined in regards to interaction with wagon lateral and vertical dynamics. Various applications of longitudinal train dynamics are then presented. As an alternative to the tradition single wagon mass approach to longitudinal train dynamics, an example incorporating fully detailed wagon dynamics is presented for a crash analysis problem. Further applications of starting traction, air braking, distributed power, energy analysis and tippler operation are also presented.     

“学-导多元互动”教学模式对高校艺术设计教育的启示——以视觉传达设计教学为例

“学-导多元互动”教学模式是依据相关教育理论、教育观念以及结合现代远程开放教育发展的要求和实践而形成的重在体现以人为本,真正做到“以学习者为中心”,为学习者提供多元的服务,满足学习者的学习需要和求知愿望,构建终身学习体系和学习型社会的教育思想的教学模式。文章以视觉传达设计教学为例,从“学-导多元互动”教学模式的内涵、教学效果及对高校艺术设计教育的启示三个方面加以阐述,希望对于高校艺术设计教育教学模式的改革起到一些借鉴作用。