共查询到19条相似文献,搜索用时 109 毫秒
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针对某高压调压器的调压进行了分析,结合原理及日常的维护工作,总结了该型调压器日常维护方面的经验.该型调压器为常见高压调压器中较复杂的一种,通过分析,能够对这一类型的高压调压器有一定的原理认识及日常维护能力. 相似文献
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在介绍交流调压原理和开关型斩控式交流调压电路的基础上,系统采用STCl2C5608AD单片机产生PWM信号,通过驱动电路对IGBT开关管进行控制。最后给出了仿真及实验波形,结果表明,斩波控制交流调压器具有易滤波,输出电压、电流波形好的优点。 相似文献
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民用煤气由于输送管线长,民用煤气峰谷压差大,在入户前要进行调压、稳压,确保用户安全用气。通过对雷诺式调压器和弹簧负载式调压器的应用,总结了燃气调压器应用、维护和检修管理流程。 相似文献
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通过分析现有燃气调压器手动调压的工作原理,详细论述了如何设计开发出基于单片机的可自动调压的蜗轮丝杠精进装置,该装置使得调压精度大幅度提高,并且具有远程数据传输接口,能够实现远程测控,从而为构建复杂燃气工业系统提供一种可以借鉴的方法。 相似文献
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根据国家环保部对火力发电机组的脱硫旁路挡板限期拆除和新建机组无脱硫旁路挡板建设的要求,解决300MW级火电机组脱硫增压风机运行中保护跳闸直接导致机组停运的问题,本文主要阐述了300MW级火电燃煤机组脱硫增压风机跳闸RB(Run Back)方案设计和在多台300MW级火电机组上成功应用的实例,证明脱硫增压风机保护跳闸RB控制逻辑方案设计的合理性和必要性,并为国内300MW级火电机组脱硫增压风机跳闸RB设计与应用提供典型设计和参考方案. 相似文献
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直流数字化电能表在电能计量中应用日益广泛,但缺乏专门针对直流数字化电能表量值溯源方案的研究。针对我国缺乏对直流数字电能表量值溯源方案的研究现状,以及现有的交流数字电能表量值溯源方案中存在标准电能计算准确度受采样频率限制、量传误差环节多等问题,提出了一种基于直流数字化标准功率源的直流数字电能表量值溯源方案。该方案在交流数字电能表量值溯源方案的基础上,利用标准数字功率源内置DSP的数字波形拟合与抽取,替代交流溯源方案中的A/D转换;利用DSP高频数字采样积分,替代交流溯源方案中的标准数字电能表。简化了交流数字表的溯源方案,减少量传误差,提高了直流标准电能计算精度,实现了直流数字化电能表的量值溯源,是直流数字化电能表量值溯源的一种新方案。 相似文献
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随着国内重型汽车的发展,换档轻便性日益受到重视,因此全同步器变速器加装换档气动助力器已成为一种发展趋势。对气动助力器的结构及工作原理进行介绍,并介绍了10档变速器用气动助力器的改进设计方案。 相似文献
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针对基于模块化多电平换流器的柔性直流电网直流侧故障难以快速清除的问题,对基于MMC的柔性直流输电技术的基本原理和3种主流的直流侧故障隔离技术进行了研究。分析比较了3种高压直流断路器技术路线,选择混合式高压直流断路器作为清除柔性直流电网直流侧短路故障的方案,介绍了一种混合式高压直流断路器的基本结构和直流故障处理过程。参考交流电网断路器失灵保护策略,提出基于柔性直流电网的输电线路和母线上直流断路器失灵保护方案,并在PSCAD/EMTDC上搭建模型进行仿真验证。研究结果表明:所提出的断路器失灵保护方案在线路和母线上断路器未成功动作时使相邻断路器跳闸,实现故障的彻底隔离,并清除短路故障电流。 相似文献
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This paper presents the implementation and vehicle tests of a vehicle longitudinal control scheme for Stop and Go cruise control.
The control scheme consists of a vehicle-to-vehicle distance control algorithm and throttle/brake control algorithm for acceleration
tracking. The desired acceleration of a vehicle for vehicle-to-vehicle distance control has been designed using Linear Quadratic
optimal control theory. Performance of the control algorithm has been investigated via vehicle tests. A millimeter wave radar
sensor has been used for distance measurement. A stepper motor and an electronic vacuum booster have been used for throttle/
brake actuators, respectively. It has been shown that the proposed control algorithm can provide satisfactory performance. 相似文献
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简要的介绍了轨道交通变电所综合自动化系统及其直流牵引系统的整体结构,并根据实际需求,给出了LOGO!在北京某轨道交通直流牵引监控系统的具体解决方案,最后给出了LOGO!的优点及其不足之处。 相似文献
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结合产品开发过程,介绍了直流操作电源智能监控系统的结构、原理和设计方案,具体介绍了蓄电池自动管理模式和闭环限流算法,为新一代直流电源设备的设计提供了一种有价值的参考方案。 相似文献
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The most common booster is called input pressure reduced (IPR) booster. However, this type of booster has its own shortages, such as its small output flow, when the boosting ratio is higher, the shortage becomes more distinct. Recent research on pneumatic boosters mainly focused on the factors that influence the characteristics of the boosters, some new kinds of pneumatic booster structures were designed, but the efficiency and output flow of these boosters are still not improved sufficiently. In order to improve the output flow of the pneumatic booster, a new kind of booster, expansion energy used (EEU) booster, is proposed. Non-linear differential equations of the pneumatic booster are set up. By using the software MATLAB/Simulink for simulation, the motion characteristics of the pistons, the characteristics of the output flow of the boosters are obtained for analysis of a principle. The principle, which is used to elevate the output flow of the two kinds of boosters, is that the average pressure of the air in the driving chambers of the EEU booster is higher than that of the IPR booster. The simulation and experimental research of the output flow characteristics are done. The simulation and experimental results are in a good accordance. And the simulation and experimental results show that when the air source pressure and the output pressure are set at 0.6 MPa and 0.8 MPa, respectively, with the increase of the terminal pressure of the air in the driving chamber, the output flow of the IPR booster ascends stably. As the terminal pressure of the air in the driving chamber goes up, the output flow of the EEU booster rises, and later it almost remains constant. In addition, with the same terminal pressure, the output flow of the EEU booster is greater than that of the IPR booster, and the difference decreases when the terminal pressure grows. At last, the output pressure is set at 0.8 MPa, under the optimum work state of the EEU booster, the output flow of the two kinds of boosters all declines with the rise of the boosting ratio. Furthermore, the output flow of the EEU booster is higher than that of IPR booster by 95 L/min approximately. The proposed research lays the foundation for optimistic of the EEU booster. 相似文献