排序方式: 共有94条查询结果,搜索用时 140 毫秒
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舰船电力系统中智能电网技术的应用浅析 总被引:1,自引:0,他引:1
智能电网技术具有能量优化分配、管理和控制方面的优势,但是舰船电力系统在能量来源、设计理念、可靠性等方面又有着特殊的要求。因此通过重点分析智能电网技术与舰船电力系统的协调性,探讨舰船电力系统应用和实现智能电网技术的重点和关键技术,提出舰船智能电网对信息集成技术、实时监测技术、智能决策技术的要求要远高于陆地智能电网,而且相应的智能装备研制,也必须考虑到应用的特殊环境,从而需要将自愈、智能对话、优质电能、电磁兼容和抗攻击性作为主要应用特征和发展重点,并重点关注和解决与之相关的灵活的电网结构、传感与测量技术、信息化技术、智能型设备等关键问题,开发出能与舰船系统有效结合的合适的智能电网,充分发挥智能电网技术的优势,推动舰船先进装备的研制,达到提高舰船整体作战能力的最终目的。 相似文献
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为提高安全型继电器的测试精度和数据一致性,设计了一种基于C/S模式的智能测试系统,实现了安全型继电器电气特性的自动测试和数据管理、共享。详细阐述了智能测试系统的架构、硬件接口和软件的设计技术及实现。该系统已在继电器生产过程中实际应用,取得了良好的效果。 相似文献
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通过分析指出传统故障-安全系统在电子系统日趋复杂的背景下将遇到故障检测复杂性剧增的问题,为解决系统设计的可持续发展问题,满足用户对可靠性和安全性不断提高的需求,提出一种智能的N取M型高可靠安全计算机系统,并在系统的可靠性、安全性、设计成本、可维护性以及系统容量方面同传统安全系统进行对比分析。性能仿真数据说明新的安全计算平台不仅能够完全满足IEC61508中SIL4等级系统的要求,更重要的是,这一类型的安全计算结构极大地降低了对单器件可靠性及安全性的要求,比传统故障-安全结构在设计和维护成本方面更加具备可持续发展的潜力。 相似文献
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沈桢桢 《南通航运职业技术学院学报》2012,(3):126-128
通过分析当今中国学习英语的现状,结合构建主义理论、学习风格理论及实际英语教学中存在的问题,从学生和教师两方面论述了采用移动学习法学习英语的可行性,并介绍了使用三种常见的移动设备学习英语的具体方法,最终得出基于网络的英语移动学习在中国有着积极的作用和广泛的前景这一结论。 相似文献
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阐述了基于Smart3.0客票系统的客票作废监控软件的设计思想和实现方法.该软件具有实用强,执行效率高等特点.它为地区中心和车站掌握客票作废情况提供了一个理想的监控手段. 相似文献
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Waiting time at public transport stops is perceived by passengers to be more onerous than in-vehicle time, hence it strongly influences the attractiveness and use of public transport. Transport models traditionally assume that average waiting times are half the service headway by assuming random passenger arrivals. However, research agree that two distinct passenger behaviour types exist: one group arrives randomly, whereas another group actively tries to minimise their waiting time by arriving in a timely manner at the scheduled departure time. This study proposes a general framework for estimating passenger waiting times which incorporates the arrival patterns of these two groups explicitly, namely by using a mixture distribution consisting of a uniform and a beta distribution. The framework is empirically validated using a large-scale automatic fare collection system from the Greater Copenhagen Area covering metro, suburban, and regional rail stations thereby giving a range of service headways from 2 to 60 min. It was shown that the proposed mixture distribution is superior to other distributions proposed in the literature. This can improve waiting time estimations in public transport models. The results show that even at 5-min headways 43% of passengers arrive in a timely manner to stations when timetables are available. The results bear important policy implications in terms of providing actual timetables, even at high service frequencies, in order for passengers to be able to minimise their waiting times. 相似文献
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Transportation and land-use preferences and residents’ neighborhood choices: the sufficiency of compact development in the Atlanta region 总被引:1,自引:0,他引:1
This paper analyzes the transportation and land-use preference and actual neighborhood choices of a sample of 1,455 residents
of metro Atlanta. We develop a stated-preference scale on which desires for neighborhood type are gauged, from preferences
for low-density, auto-oriented environments to desires for compact, walkable, and transit-oriented neighborhoods. This scale
is then related to desires for change in one’s own neighborhood characteristics after a hypothetical move. If all neighborhood
preferences were equally likely to be satisfied, then neighborhood preferences would not be correlated with a desire for change.
By contrast, in the current study, stronger preferences for a more walkable environment are associated with greater desire
for change in one’s neighborhood characteristics. This suggests an undersupply of compact, walkable, and transit-friendly
neighborhood types relative to current demand.
相似文献
Lawrence D. Frank (Corresponding author)Email: |