Modern telecommunication methods have many impacts on manufacturing, and tele service has become one of the strategic approaches to realize the ideas of a flexible manufacturing system. Monitoring and maintenance of ...Modern telecommunication methods have many impacts on manufacturing, and tele service has become one of the strategic approaches to realize the ideas of a flexible manufacturing system. Monitoring and maintenance of production lines from the remote monitor center is an important application of such techniques. This paper presents a typical model of tele service systems and discusses the underlying challenges. RMMST (remote monitoring and maintenance system testbed), based on PC PLC and their networks which are used widely in production lines, is presented in detail as a concrete example. With the support of digital technique, RMMST can be used in the monitoring and maintenance of remote production lines conveniently.展开更多
将神经网络与比例-积分-微分(Proportion Integral Differential,PID)相结合,设计电力可编程逻辑控制器(Programmable Logic Controller,PLC)高精度温控方法。选用GX20MH01型号的温度传感器采集温度数据;选择多层前馈神经网络作为神经...将神经网络与比例-积分-微分(Proportion Integral Differential,PID)相结合,设计电力可编程逻辑控制器(Programmable Logic Controller,PLC)高精度温控方法。选用GX20MH01型号的温度传感器采集温度数据;选择多层前馈神经网络作为神经网络结构,计算网络传播数据的误差;通过神经元输出的激活数值,引进PID控制算法,整定电力系统控制器温度参数;基于专家经验知识,将输入变量划分为若干个模糊集合,以此为依据设计模糊控制规则,高精度控制电力PLC温度。对比实验结果表明:应用设计的方法进行温度控制后,电力PLC温度值稳定在目标值,波动范围极小,控制效果良好。展开更多
为解决物联网通信技术目前存在的传输距离受限、成本高昂和信号易受干扰等问题,对PLC-IoT(power line communication internet of things)技术在智能物联网领域的应用架构开展了相关研究。在ZigBee无线通信技术、Konnex(KNX)总线技术的...为解决物联网通信技术目前存在的传输距离受限、成本高昂和信号易受干扰等问题,对PLC-IoT(power line communication internet of things)技术在智能物联网领域的应用架构开展了相关研究。在ZigBee无线通信技术、Konnex(KNX)总线技术的基础上,依据PLC-IoT技术的免布专用通信线、通信带宽高、通信时延低等技术特性及优势,设计了PLC-IoT技术在配电物联网、智慧道路、智能充电桩等智慧物联网领域的应用架构,并验证了PLC-IoT技术应用于智能家居系统的可行性。结果表明:应用PLC-IoT技术的家居系统实现了ZigBee技术家居系统无法做到的长距离稳定通信,较使用KNX技术降低了约30%的成本,提升了系统整体的抗干扰性。PLC-IoT技术相较于ZigBee技术和KNX技术更适合实现智能家居、楼宇自动化等智慧物联,可提升系统的安全性与稳定性,满足新兴业务对可靠性和效率的需求。展开更多
文摘Modern telecommunication methods have many impacts on manufacturing, and tele service has become one of the strategic approaches to realize the ideas of a flexible manufacturing system. Monitoring and maintenance of production lines from the remote monitor center is an important application of such techniques. This paper presents a typical model of tele service systems and discusses the underlying challenges. RMMST (remote monitoring and maintenance system testbed), based on PC PLC and their networks which are used widely in production lines, is presented in detail as a concrete example. With the support of digital technique, RMMST can be used in the monitoring and maintenance of remote production lines conveniently.
文摘将神经网络与比例-积分-微分(Proportion Integral Differential,PID)相结合,设计电力可编程逻辑控制器(Programmable Logic Controller,PLC)高精度温控方法。选用GX20MH01型号的温度传感器采集温度数据;选择多层前馈神经网络作为神经网络结构,计算网络传播数据的误差;通过神经元输出的激活数值,引进PID控制算法,整定电力系统控制器温度参数;基于专家经验知识,将输入变量划分为若干个模糊集合,以此为依据设计模糊控制规则,高精度控制电力PLC温度。对比实验结果表明:应用设计的方法进行温度控制后,电力PLC温度值稳定在目标值,波动范围极小,控制效果良好。
文摘为解决物联网通信技术目前存在的传输距离受限、成本高昂和信号易受干扰等问题,对PLC-IoT(power line communication internet of things)技术在智能物联网领域的应用架构开展了相关研究。在ZigBee无线通信技术、Konnex(KNX)总线技术的基础上,依据PLC-IoT技术的免布专用通信线、通信带宽高、通信时延低等技术特性及优势,设计了PLC-IoT技术在配电物联网、智慧道路、智能充电桩等智慧物联网领域的应用架构,并验证了PLC-IoT技术应用于智能家居系统的可行性。结果表明:应用PLC-IoT技术的家居系统实现了ZigBee技术家居系统无法做到的长距离稳定通信,较使用KNX技术降低了约30%的成本,提升了系统整体的抗干扰性。PLC-IoT技术相较于ZigBee技术和KNX技术更适合实现智能家居、楼宇自动化等智慧物联,可提升系统的安全性与稳定性,满足新兴业务对可靠性和效率的需求。
