钢锭铣削型钢纤维用于厂区道路和工业地坪的计算方法

与普通混凝土相比,钢纤维混凝土具有较大的抗拉强度,其抗裂性能和抗冲击性能突出。钢纤维混凝土用于厂区道路和工业地坪可使该材料的抗裂和抗动力荷载的优良性能得到充分发挥。如何较好地考虑厂区道路和工业地坪各种复杂受力,并用合理而且简便的计算模型对其设计计算,成为保证钢纤维混凝土厂区道路和工业地坪使用寿命和质量的关键。该文对钢锭铣削型钢纤维混凝土力学性能进行了分析,介绍了钢锭铣削型钢纤维混凝土厂区道路和工业地坪的力学计算模型和简化设计计算方法。     

遥控潜器工作母船动力定位系统

针对我国第一艘装备动力定位系统的遥控潜器工作母船,本文重点介绍了动力定位系统的运动控制数学模型,基本控制原理,系统组成,工作方式,综合显示与集中操纵设计思想,遥控潜器工作母船已完成航行试验,结果表明：在最大风速13米／秒时,动力定位系统控位均方差在5m之内。长期实际应用证明：系统运动可靠,人机界面形象直观,操纵灵活。     

船舶动力定位系统总体设计研究

船舶动力定位系统,主要实现船舶在要求的作业活动中保持设定的经纬度或者相对于海床的固定位置,或者期望的运动方向,即在风、流、浪产生的力作用在船舶的情况下,动力定位系统能够通过各推进器控制船舶,并使船舶按照操作者的指令移动、保持位置或航向,同时,符合相应规范要求。本文主要介绍船舶动力定位系统的总体设计,包括硬件框架设计和软件框架设计。最后,给出了基于这种总体设计的动力定位系统实船试验结果。     

管道挖沟动力定位工程船结构设计

管道挖沟动力定位工程船是一艘集首部拖缆作业系统、尾部拖缆作业系统以及其他多项水下作业功能的海底施工作业船舶,为配合其作业功能,对诸多大型作业设备进行结构加强,并创新性地设计凹形首柱拖缆槽和导缆圆尾。通过计算分析,对横剖面进行优化,校核总纵强度以及校核主要设备加强结构的局部强度,对船体振动进行评估并采取一定的减振措施。     

Virtual Reality Simulation of Fuzzy-logic Control during Underwater Dynamic Positioning

In this paper, graphical-user-interface (GUI) software for simulation and fuzzy-logic control of a remotely operated vehicle (ROV) using MATLABTM GUI Designing Environment is proposed. The proposed ROV...     

An empirical assessment of the feasibility of battery electric vehicles for day-to-day driving

Driven by sustainability objectives, Australia like many nations in the developed world, is considering the option of battery electric vehicles (BEVs) as an alternative to conventional internal combustion engine vehicles (ICEVs). In addition to issues of capital and running costs, crucial questions remain over the specifications of such vehicles, particularly the required driving range, recharge time, re-charging infrastructure, performance, and other attributes that will be of importance to consumers. With this in mind, this paper assesses (hypothetically) the extent to which current car travel needs could be met by BEVs for a sample of motorists in Sydney assuming a home-based charging set-up, which is likely to be the primary option for early adopters of the technology. The approach uses five weeks of driving data recorded by GPS technology and builds up home-home tours to assess the distances between (in effect) charging possibilities. An energy consumption model based on characteristics of the vehicle, and the speeds recorded by the GPS is adapted to determine the charge used, while a battery recharge function is used to determine charging times based on the current battery level. Among the most pertinent findings are that over the five weeks, (i) BEVs with a range as low as 60 km and a simple home-charge set-up would be able to accommodate well over 90% of day-to-day driving, (ii) however the incidence of tours requiring out-of-home charging increases markedly for vehicles below 24 kWh (170 km range), (iii) recharge time in itself has little impact on the feasibility of BEVs because vehicles spend the majority of their time parked and (iv) effective range can be dramatically impacted by both how a vehicle is driven and use of electrical auxiliaries, and (v) while unsuitable for long, high-speed journeys without some external re-charging options, BEVs appear particularly suited for the majority of day-to-day city driving in big cities where average journey speeds of 34 km/h are close to optimal in terms of maximising vehicle range. The paper has implications for both policy-makers and auto manufacturers in breaking down some of the (perceived) barriers to greater uptake of BEVs in the future.     

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智能交通系统是目前国内外公认的解决城市交通拥堵问题的重要途径之一，也是费效比最显著的途径。作为国内城市交通系统最重要组成部分之一的公共交通系统，近年来开始出现了大量智能公共交通系统方面的应用尝试。本文对我国目前城市投入应用的智能公共交通系统（APTS）的应用状况进行了分析，并根据我国当前国情，分析了我国智能公交系统未来可能的应用方向，提出了对智能公共交通系统改进的技术趋势分析。     

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在目前的出租车调度系统中,调度的出租车可能需要经过城市堵车区域,不能及时为乘客提供服务,本文对城市道路堵车对出租车调度的影响进行研究.根据出租车自动上传的城市道路堵车信息,建立出租车通过堵车区域的损耗方程,结合城市各道路交叉路口之间的距离,采用Dijkstra算法对最佳调度路径进行求解.实验仿真结果给出了发生堵车时,不同单位额外损耗(β)情况下对应的调度路程、路径和规避堵车区域发生的时间.最后与未考虑城市道路堵车的调度系统进行比较.比较结果表明,通过设置合理的β值,系统可根据堵车严重程度,合理规划出租车路径,规避堵车较严重区域.     

应用型海运本科院校航运经贸专业群建设研究

专业群建设是应用型本科院校实现内涵发展,提升外部竞争力的重要途径．广州航海学院应充分发挥行业办学传统及新建本科院校的后发优势,借鉴应用型海运本科专业建设实践经验,把握我国航运服务业产业链发展的高端化趋势,对接航运服务业构建航运特色经贸专业群,实现专业人才培养与服务产业发展的双重贡献．