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关键词： 矿山开采   掘进机械设备   电气自动化   自动控制  

摘要： 针对常规自动化改造方法中存在的协调性差的问题,提出矿山掘进机械设备的电气自动化改造研究。从掘进机械设备的控制模块和制动模块两个部分进行优化改造,将控制质量转变为传递函数,在制动模块中实现机械设备的自动化。实验结果表明:在控制度不断变化的条件下,提出的电气自动化改造方法协调性优于常规的改造方法。

关键词： 水电厂   计算机监控系统   AGC   PID调节   一次调频   自动控制  

摘要： 三板溪电厂计算机监控系统 AGC 对机组的功率闭环是通过计算机系统 PID 调节向调速器发出脉冲指令,以增减导叶开度来实现。电网频率出现波动时,电网频率出现波动时,调速器一次调频功能以稳定电网频率为首要任务,必然导致机组出力与目标值出现偏差,产生控制矛盾。本文介绍了三板溪电厂自动发电控制功能特,AGC 与一次调频功能配合存在的问题和处理方法、同时探讨通过优化监控系统 PID 调节策略,使机组功率闭环的自动控制取得更好的效果。

关键词： 转炉汽化冷却   新工艺技术   余热蒸汽   自动控制   蓄热能力   饱和蒸汽   供汽   汽水系统  

摘要： 转炉汽化冷却系统的饱和蒸汽有效利用率低、蓄热器蓄热能力不足、供汽不稳、供汽含水率高、饱和蒸汽汽轮机运行不稳定等给生产带来诸多问题,为此,我们尝试采用新工艺技术来解决这些问题,最终实现转炉汽化冷却汽水系统自动控制,提高饱和蒸汽生产及利用效率,达到生产及供汽运行稳定、操作方便。

ISBN: (纸本)9787568296205

摘要： This paper is concerned with small UAV (unmanned aerial vehicle) control algorithm development during landing. The UAV landing problem for small UAVs (less than 20 kg) remains actual despite the great amount of books, papers, and monographs devoted to this topic. In this paper, a model with V-shaped keel is under consideration. Mechanization of such a vehicle consists of flaperons and ailerons. To describe a flight, a system of nonlinear differential equations is developed. The automatic control both for longitudinal and lateral motion as well as for thrust is designed. The stability analysis of the controlled system is conducted by plotting stability regions in the space of the feedback coefficients. The results of a numerical modeling of a flight with external disturbances are given. © 2021, Springer Science+Business Media, LLC, part of Springer Nature.

关键词： Groundwater balance   Automatic control   Pumping and recharge   Pumped water treatment  

摘要： The construction of a metro system in groundwater-rich stratums can cause an imbalance in groundwater levels. This study presents an automatic pumping-recharge system (APRS) to maintain groundwater balance during dewatering, thereby protecting the environment. The APRS overcomes the limitations of the traditional pumping-recharge operation performed manually by workers. Further, in traditional pumping-recharge operations, a large proportion of the pumped water is wasted by draining it into the sewerage system;this is because of the lack of an efficient application for groundwater recharge. The developed APRS system includes three subsystems: i) a pressure control system, ii) an integrated process system, and iii) an intelligent electronic control system. The APRS can not only balance the groundwater system but also control the settlement during underground construction. The proposed system has been employed in the construction of a metro station in Jinan city, which has a dense distribution of spring groups. The efficiency of the APRS was verified by field observations.

关键词： 农业生产   自动化控制技术   应用   策略  

摘要： 在科学技术的推动下,在农业生产中,自动化控制技术的应用,有效提高了农业生产效率,并减少了农民的劳动强度,促进了农业经济效益的快速增长。文章从农业机械、无土栽培、节水灌溉、温室大棚等方面对农业生产中自动化控制技术的应用情况进行了分析,并探讨了农业生产自动化的发展策略。