排序方式: 共有97条查询结果,搜索用时 265 毫秒
91.
田丽平 《华东交通大学学报》2012,29(3):36-39
针对当前合并单元的研究现状,分析了合并单元的采样值映射模型IEC61850-9-2及其实现方法,在此基础上设计了一种基于现场可编程门阵列(FPGA)的合并单元装置。该装置通过在FPGA芯片上配置NiosII软核处理器和相关接口,完成合并单元同步、多路数据接收和处理以及以太网通信等功能,能满足电子式互感器数字接口的要求。 相似文献
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对Oracle 9i在RedHatAdvanced Server Linux上的安装过程进行了总结,着重介绍了Oracle 9i安装时对RedHat Advanced Server的要求和解决办法. 相似文献
93.
深圳地铁9号线盾构法隧道管片预埋滑槽设计研究及探讨 总被引:3,自引:0,他引:3
为解决地铁隧道机电设备安装阶段打孔对管片结构的损伤问题,以深圳地铁9号线工程为背景,对盾构法隧道管片预埋滑槽设计进行相应的研究和探讨。通过相关的受力计算分析及试验验证,认为在地铁盾构法隧道内设计预埋滑槽的方案是安全可靠的,实施是可行的,可在相同类型工程中加以推广应用,以达到方便施工、易于维护和节能环保的绿色建造目的。 相似文献
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分析无刷直流电机控制原理,设计一款基于MC9S12XS128单片机的直流无刷电机控制系统。介绍无刷电机控制器的硬、软件设计方案,实现无刷电机的正反转、起停控制、调速控制、过流保护等功能。实验证明,控制系统运行效果良好,具有成本低、易维护、稳定性好等优点,适合在小型电动车中广泛推广。 相似文献
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Various types of floating solar photovoltaic (FPV) devices have been previously proposed, designed and constructed with applications primarily limited to onshore water bodies or near-shore regions with benign environmental conditions. This paper proposes a novel FPV concept which can survive harsh environmental conditions with extreme wave heights above 10 m. This concept uses standardised lightweight semi-submersible floats made of circular materials as individual modules. The floating modules are soft connected with ropes to form an FPV array. We first present the conceptual design of the floats and the connection systems, including hydrostatic, hydrodynamic, and structural assessments of the floats. To verify the motion response performance, we carried out 1:60 scaled model tests for a 2 by 3 array under regular and irregular wave conditions. From the time series and response spectra, the motion characteristics of the array and the mooring responses are analysed in detail. The proposed concept exhibits excellent performances in terms of modular motions with limited wave overtopping and no contact is observed between adjacent modules under the extreme wave conditions. The findings of this study can serve as a valuable reference to developing reliable and cost-effective FPV technologies for offshore conditions. 相似文献
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