共查询到20条相似文献,搜索用时 125 毫秒
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汪冰冰 《仪器仪表标准化与计量》2012,(3):38-40
本文描述了化工企业能源管理系统的技术路线,对该系统采用的LonWorks现场控制网络技术进行了描述,从现场设备层、通信网络层和系统应用层三个层次简要描述了系统的技术特征和应用,并又寸系统中采用的变频节能技术和网络通信方式进行了描述。 相似文献
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汪冰冰 《仪器仪表标准化与计量》2012,(4):40-43,48
本文描述了一种应用于智能电网的电力需求侧管理系统的技术路线,对该系统采用的LonWorks控制网络进行了描述,并从现场设备层、通信网络层和系统应用层三个层次简要描述了系统的技术特征和应用。 相似文献
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面向云制造的数控加工服务关键技术 总被引:1,自引:0,他引:1
根据云制造、云服务的原理总结了数控加工云服务的基本特征,分析了数控加工资源和能力的云服务化关键问题。为应对数控加工云服务中的工艺相关问题,设计了一个更加注重应用集成和知识管理的三层(服务管理层、应用集成层和基础数据层)云服务平台。通过服务组合和服务控制,该平台能协调从图纸到零件的整个过程,并支持多种应用方式。鉴于知识在这种服务系统的整体运行中的核心作用,基于本体技术构建了数控加工知识库的基本架构,包括概念层、领域层和规则层三个层次,分别描述概念、实例和推理规则,以有效表达数控加工服务并支持相关系统的智能行为。 相似文献
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面向复杂系统故障溯源的SDG-FG模型建模方法 总被引:1,自引:0,他引:1
针对故障发展在单元设备内部和各个设备间的不同特点,提出了一种基于符号有向图—故障逻辑网络图的集成模型建模方法,即在系统故障溯源集成模型中分别采用系统层和设备层对其进行刻画。系统层用于描述各设备间的状态关联影响关系,设备层用于描述单元设备内部元件的故障传递发展过程,两层之间通过设备功能状态变量进行关联集成,最终构建集成化的故障溯源模型,为实现复杂机电系统故障溯源技术研究提供模型基础。 相似文献
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基于MVC模式的网上订票系统分析与设计 总被引:1,自引:0,他引:1
刘旭 《机电产品开发与创新》2012,25(1):117-118
对系统开发所使用的相关技术进行了介绍,即MVC模式,同时,分析了客户的业务需求,并对系统各个模块的设计实现进行了描述。基于MVC模式的网上订票系统,将显示层、业务层和数据层分离,以实现代码重用和易于修改,提高系统的灵活性、复用性和可维护性,达到提高软件质量的目的。 相似文献
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谈慧 《中国制造业信息化》2010,(4):13-16
针对制造业的生产特点,分析了RFID系统在制造业中的应用需求,详细阐述了RFID技术应用于制造业提高生产效率的工作原理,基于RFID技术、网络技术和无线通信技术的集成应用,构建了一个面向生产管理的RFID应用系统架构,并根据设计要求描述了应用系统的功能模块。 相似文献
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谈慧 《中国制造业信息化》2010,39(7)
针对制造业的生产特点,分析了RFID系统在制造业中的应用需求,详细阐述了RFID技术应用于制造业提高生产效率的工作原理,基于RFID技术、网络技术和无线通信技术的集成应用,构建了一个面向生产管理的RFID应用系统架构,并根据设计要求描述了应用系统的功能模块。 相似文献
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Soo Young Kang Jeong Ho Kim Tong Seop Kim 《Journal of Mechanical Science and Technology》2013,27(8):2547-2555
The influence of steam injection and hot gas bypass on the performance and operation of a combined heat and power (CHP) system using a recuperative cycle gas turbine was investigated. A full off-design analysis was used to investigate not only the change in performance but also the variation in engine operation caused by steam injection. The performance improvement capability and operating limitations of full steam injection was examined. Selected operations (partial steam injection and underfiring) that secure minimum compressor surge margin were comparatively analyzed. Partial steam injection was found to be a better option than underfiring in all thermodynamic aspects. Under ISO condition, power and efficiency improvements in the partial injection targeted at a 10% surge margin are 27% and 7.4%, respectively. This study also investigated the increase in steam generation brought by the bypass of turbine exhaust gas around the recuperator. This bypass provided high operational flexibility by varying the capacity of thermal energy supply in both the pure CHP operation and the steam-injected operation. In particular, in the steam-injected operation, the capacity of thermal energy supply can be largely increased by the said bypass, while producing a greater power output than the pure CHP system. 相似文献
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抽汽式汽轮机调节保安系统的安装与调试 总被引:1,自引:0,他引:1
以南京汽轮机厂生产的C30-8.83/0.981-1型抽汽式汽轮机调节保安系统为例,对汽轮机调节保安系统的原理、安装及调试进行了讨论,对易发生的故障进行了分析,以便更好地保证汽轮机的安装质量,保证汽轮机安全平稳运行。 相似文献
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全自动锅炉外排废气回收设备以射吸技术为依托,以低温水(含软化水、冷凝水等)作介质,利用原来损耗在阀门上的能量作动力源,将低品位蒸汽与低温水混合,不仅回收蒸汽的低位热能,同时回收蒸汽凝结成的冷凝水。它思路新颖、结构独特、智能控制、机械电气冗余可靠性设计,100%回收乏汽低位热能与冷凝水,并回到热力系统中循环再利用,不增加原有系统背压,保证其正常运行。 相似文献
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李艳娟 《仪表技术与传感器》2011,(5)
文中阐述热采注汽机基于PLC的自动控制系统设计原理和实现过程,给出控制系统的基本组成和控制功能实现过程,包括燃油供给等自动调节功能、安全连锁保护功能、人机交互界面设计、流量计高温补偿等工作,系统并可通过GPRS网络实现专家远程监控,解决生产中的盲目性和故障维护问题.经实践证明控制系统满足实际要求,运行安全可靠,实现了生产过程的自动化、智能化、分布式网络化. 相似文献
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Sung Ku Park Tong Seop Kim Jeong L. Sohn 《Journal of Mechanical Science and Technology》2009,23(2):550-558
This study analyzed the influence of steam injection on the performance of hybrid systems combining a solid oxide fuel cell
and a gas turbine. Two different configurations (pressurized system and ambient pressure system) were examined and the effects
of injecting steam, generated by recovering heat from the exhaust gas, on system performances were compared. Performance variations
according to the design of different turbine inlet temperatures were examined. Two representative gas turbine pressure ratios
were used. Without steam injection, the pressurized system generally exhibits higher system efficiency than the ambient pressure
system. The steam injection augments gas turbine power, thus increasing the power capacity of the hybrid system. The power
boost effect due to the steam injection is generally greater in the relatively higher pressure ratio design in both the pressurized
and ambient pressure systems. The effect of the steam injection on system efficiency varies depending on system configurations
and design conditions. The pressurized system hardly takes advantage of the steam injection in terms of system efficiency.
On the other hand, the steam injection contributes to the efficiency improvement of the ambient pressure system in some design
conditions. In particular, a higher pressure ratio provides a better chance of efficiency increase due to the steam injection.
This paper was recommended for publication in revised form by Associate Editor Kyoung Doug Min
Mr. S. K. Park received his MS degree from Dept of Mechanical Engineering, Inha University in 2007, and is now Doctoral student at the same
department. His research topics include performance analysis of fuel cell and fuel cell/gas turbine hybrid sys-tem and advanced
energy systems.
Prof. T. S. Kim received his PhD degree from Dept of Mechanical Engineering, Seoul National University in 1995. He has been with Dept of
Mehanical Engineering, Inha University since 2000, and is Associate Professor as of Nov. 2008. His research area includes
simulation and test of gas turbines and aerodynamic performance of their components. He is also interested in researches on
fuel cells and fuel cell/gas turbine hybrid systems.
Prof. J. L. Sohn received his PhD degree from Dept of Mechanical Engineering, The University of Alabama in Huntsville in 1986. He has been
with School of Mechanical & Aerospace Engineering, Seoul National University since 2000, and is BK Associate Proessor as of
Nov. 2008. His research area is design, simulation and test of gas turbine system and components. He is also interested in
researches on fuel cells and fuel cell/gas turbine hybrid systems. 相似文献
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汽包锅炉给水串级三冲量控制系统 总被引:2,自引:0,他引:2
主要介绍了锅炉串级三冲量控制系统的结构、工作原理及其控制器的整定方法,并针对此控制系统的特点对其进行了仿真试验。仿真模拟结果说明,串级三冲量给水控制系统可以及时消除负荷(蒸汽量)变化和给水流量的干扰,具有较高的调节质量和调节精度,能够保障机组的安全稳定运行。 相似文献
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汽轮机、风机、烟机、发电机作为一个整体,它们相互影响,相互依存。汽轮机调节除了对汽轮机本身的运行有决定性作用,对风机、烟机、电网以及蒸汽系统的运行也有重大的影响。本文主要介绍了汽轮机控制系统的构成,详细论述了汽轮机调速和启停系统的控制原理。结合出现的故障分析了速关组合件的油压控制过程及故障处理方法。 相似文献
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在电厂安全稳定运行中,主汽温度是重要的参数之一。汽温过高或过低,都将给安全生产带来不利影响。针对火电厂主汽温对象大迟延,时变性的特点,将传统的PID控制器与模糊控制器相结合,构成了一种Fuzzy-PI复合主汽温控制系统,从而充分利用了模糊控制的动态特性好和PID调节能消除静差的特性。仿真结果表明,Fuzzy-PI复合主汽温控制器在控制品质上优于常规PID控制系统。 相似文献