共查询到20条相似文献，搜索用时 156 毫秒
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基于Multisim仿真软件在高频实验教学中的应用研究 总被引：1，自引：0，他引：1
针对传统高频电路实验箱实验教学的不足,分析了用电路仿真软件辅助实验教学的必要性,通过运用Multisim对二极管包络检波电路进行虚拟仿真实验,研究了二极管包络检波电路正常检波情况、惰性失真现象以及负峰切割失真现象等,通过不断改变电路元件参数,并进行对比,观察得到:二极管检波电路的相关特性、虚拟仿真实验结果和理论分析计算结果相一致.实践证明:将Multisim应用于高频电子线路仿真实验教学,可以克服实验教学中仪器仪表的不足以及各种干扰现象,使实验更加灵活,更具有创新性,也有利于提高学生的学习积极性和主动性. 相似文献
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朱高中 《实验室研究与探索》2013,32(2)
针对传统高频电路实验箱实践教学的不足,分析了应用电路仿真软件辅助实验教学的必要性,通过运用Multisim对二极管包络检波电路进行虚拟仿真实验,研究了二极管包络检波电路正常检波情况、惰性失真现象以及负峰切割失真现象等。通过不断地改变电路元件的参数进行对比观察得到二极管检波电路的相关特性,虚拟仿真实验结果和理论分析计算结果相一致。实践证明,将Multisim应用于高频电子线路仿真实验教学,可以克服实验教学中仪器仪表的不足以及各种干扰现象,使实验更加灵活,更具有创新性,也有利提高学生的学习的积极性和主动性。 相似文献
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介绍Multisim软件的优点及其在仿真实验中的应用,利用其对LC串联谐振回路进行虚拟仿真实验,分析其谐振频率、总电压与电流相位角、品质因数、选频特性和通频带等,探讨在电类课程实验教学中运用Multisim仿真软件替代真实实验,增强电类课程实验教学的效果。 相似文献
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杜巧连 《实验室研究与探索》2007,26(1):55-58
针对目前高校实验教学环节的现状,提出了开发实验仿真软件进行实验教学改革的措施。并通过液压课程实验仿真软件的实例介绍了多媒体仿真软件开发过程以及在实验教学中的具体运用。通过实践证明,开发实验仿真软件实施实验教学改革,效果显著。 相似文献
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阐述了将光学设计软件应用到实验教学中的意义与可行性。利用TracePro模拟设计了偏振光分离和转换的实验光路,可以通过变换光路中的条件和参数,获得各种偏振状态的光线。专业光学仿真设计软件的引入,为仿真实验教学开辟了新的途径,对于光学仿真实验教学的进一步研究具有参考价值。 相似文献
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This paper presented a control design methodology for a proton exchange membrane fuel cell （PEMFC） generation system for residential applications. The dynamic behavior of the generation system is complex in such applications. A compre- hensive control design is very important for achieving a steady system operation and efficiency. The control strategy for a 60 kW generation system was proposed and tested based on the system dynamic model. A two-variable single neuron proportional-integral （PI） decoupling controller was developed for anode pressure and humidity by adjusting the hydrogen flow and water injection. A similar controller was developed for cathode pressure and humidity by adjusting the exhaust flow and water injection. The desired oxygen excess ratio was kept by a feedback controller based on the load current. An optimal seeking con- troller was used to trace the unique optimal power point. Two negative feedback controllers were used to provide AC power and a suitable voltage for residential loads by a power conditioning unit. Control simulation tests showed that 60 kW PEMFC generation system responded well for computer-simulated step changes in the load power demand. This control methodology for a 60 kW PEMFC generation system would be a competitive solution for system level designs such as parameter design, performance analysis, and online optimization. 相似文献
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In this paper, a 60 kW proton exchange membrane fuel cell (PEMFC) generation system is modeled in order to design the system
parameters and investigate the static and dynamic characteristics for control purposes. To achieve an overall system model,
the system is divided into five modules: the PEMFC stack (anode and cathode flows, membrane hydration, and stack voltage and
power), cathode air supply (air compressor, supply manifold, cooler, and humidifier), anode fuel supply (hydrogen valve and
humidifier), cathode exhaust exit (exit manifold and water return), and power conditioning (DC/DC and DC/AC) modules. Using
a combination of empirical and physical modeling techniques, the model is developed to set the operation conditions of current,
temperature, and cathode and anode gas flows and pressures, which have major impacts on system performance. The current model
is based on a 60 kW PEMFC power plant designed for residential applications and takes account of the electrochemical and thermal
aspects of chemical reactions within the stack as well as flows of reactants across the system. The simulation tests show
that the system model can represent the static and dynamic characteristics of a 60 kW PEMFC generation system, which is mathematically
simple for system parameters and control designs. 相似文献
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WANG Rui-min CAO Guang-yi ZHU Xin-jian 《浙江大学学报(A卷英文版)》2007,8(5):741-747
Model and simulation are good tools for design optimization of fuel cell systems. This paper proposes a new hybrid model of proton exchange membrane fuel cell (PEMFC). The hybrid model includes physical component and black-box com-ponent. The physical component represents the well-known part of PEMFC, while artificial neural network (ANN) component estimates the poorly known part of PEMFC. The ANN model can compensate the performance of the physical model. This hybrid model is implemented on Matlab/Simulink software. The hybrid model shows better accuracy than that of the physical model and ANN model. Simulation results suggest that the hybrid model can be used as a suitable and accurate model for PEMFC. 相似文献
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INTRODUCTION Fuel cells have attracted more attention in the last few years due to scarcity of the world energy source. The Proton Exchange Membrane Fuel Cell (PEMFC) is the focus of current development efforts because it is capable of higher power density and faster start-up than other fuel cells (Zhang et al., 2004). Research emphasis is on high power density with adequate energy conversion efficiency. PEMFC performance is related to many factors, among which electrolyte membrane … 相似文献
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Control design is important for proton exchange membrane fuel cell （PEMFC） generator. This work researched the anode system ofa 60-kW PEMFC generator. Both anode pressure and humidity must be maintained at ideal levels during steady operation. In view of characteristics and requirements of the system, a hybrid intelligent PID controller is designed specifically based on dynamic simulation. A single neuron PI controller is used for anode humidity by adjusting the water injection to the hydrogen cell. Another incremental PID controller, based on the diagonal recurrent neural network （DRNN） dynamic identification, is used to control anode pressure to be more stable and exact by adjusting the hydrogen flow rate. This control strategy can avoid the coupling problem of the PEMFC and achieve a more adaptive ability. Simulation results showed that the control strategy can maintain both anode humidity and pressure at ideal levels regardless of variable load, nonlinear dynamic and coupling characteristics of the system. This work will give some guides for further control design and applications of the total PEMFC generator. 相似文献
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针对H3C设备的模拟软件,相对来说,非常单一,这主要是生产厂商模拟软件的开发滞后于硬件研发,而且相比CISCO这样的国外大型巨头,现在还没有专业的模拟软件公司为了市场的需要而独立开发H3C的模拟软件,当然,这也可能包括了知识产权保护等条件限制。目前,能被应用的就是北京永生网络技术研发中心的HV～RouteSim。 相似文献
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INTRODUCTION Distributed cogeneration technology is a hot topic in electrical and energy industries (Ferguson and Ugursal, 2004). China’s need to limit the power usage in some places to meet the peak power demand in summer of recent years stimulated and supported increasing research on distributed generation tech- nologies. Fuel cells, as renewable energy sources, are considered one of the most promising sources of distributed electrical power. Operational fuel cell systems have perform… 相似文献
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This paper discusses dynamic characteristics of proton exchange membrane fuel cell (PEMFC) under rapid fluctuation of power demand. Wavelet neural network is adopted in the identification of the characteristic curve to predict the voltage. The system control scheme of the voltage and power is introduced. The corresponding schemes for voltage and power control are studied. MATLAB is used to simulate the control system. The results reveal that the adopted control schemes can produce expected effects. Corresponding anti-disturbance and robustness simulation are also carried out. The simulation results show that the implemented control schemes have better robustness and adaptability. 相似文献
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针对食品工程专业课程的教学特点，探讨了食品工程实验模拟在食品工程专业教学中的应用，采用可视化编程语言VB，开发出了一套符合教学实际的新一代的基于Windows平台的食品工程实验模拟软件，并展望了实验模拟的发展前景。 相似文献