满足冗余要求的起重铺管船冷却水系统设计

从分析规范对有二级动力定位的船舶推进系统的冗余要求出发,阐述了某起重铺管船冷却水系统为满足单个故障时的冗余要求而采取的措施：发电机组和系统分组,设备元件的冗余设置,以及冷却水系统的平衡。     

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.     

浅谈近场测试在电磁兼容诊断中的应用

针对电磁兼容测试中EMI辐射源定位难的问题,提出一种噪声源定位的近场诊断测试方法,即采用不同尺寸、不同类型的近场探头在被试品的近区场进行测试,来准确定位辐射发射较大的点位。该方法能快速、有效地完成产品辐射EMI故障定位,对实际的电磁辐射测试具有指导意义。     

大跨度悬索桥颤振分析的能量方法

建立了对悬索桥进行颤振分析的一种新的计算方法。该方法将结构与气流作为一个系统，从能量平稳铁角度研究系统的稳定性；将模态广义坐标位移和速度作为状态向量，首先组集系统在自激力作用下的状态空间方程，然后应用精细时程积分求解状态向量的时程响应，在此基础上计算系统及各阶模态的等效阻尼比，并由系统的等效阻尼判断系统在不同风速下的稳定性；以跨度为８８８ｍ的虎门悬索桥为算例，证实了本文方法的正确性。     

城市公交智能信息系统发展研究

本文简要论述了城市公交智能信息系统的构成及其实施的必要性,分析了各子系统的主要作用及相互关系,在通常采用的公交智能信息系统的基础上又提出了一套新的开发思路,同时对所涉及的相关的关键技术如GPS、GIS 等作了简要的介绍和分析。     

核反应堆压力壳螺栓孔检测自动小车的定位

设计了能在高辐射环境下工作的、全自动检查核电站反应堆压力壳连接处法兰面主螺栓孔螺纹表面缺陷的设备，解决了自动小车的设备承载和准确定位问题．自动小车在移动中靠法兰面被测螺栓孔定位，经现场检测其定位精度达到0．15mm，满足设计要求．