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针对目前城市车辆剧增和交通拥挤的现象,设计一种基于PLC控制的模糊交通控制系统。该系统选用电感式传感器探测车辆的通过,用PLC内高速计数器对车辆数量进行计数。运用一定的模糊智能控制原则,PLC就能依据车流量的情况自动调节红绿灯的时间长度,从而提高交通控制效率,缓解交通拥挤,达到最优控制。在某城市十字交通路口实验表明,该方法可以很大程度上解决城市车辆交通问题,是一种新型的智能化设计方法,具有推广应用价值。 相似文献
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在《机电传动控制》实验教学中,为使初学者能运用所学的PLC理论,设计了一个PLC仿真实验(交通信号灯控制)编程。通过此编程介绍了怎样运用PLC的功能、T形图等知识编程,指导初学者解决在做有关PLC实验中遇到的问题和难点。 相似文献
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桅杆式架梁起重机结构简单、起重量大,操作方便,广泛应用于各类桥梁建设项目中的桥梁杆件吊装。目前,桅杆式架梁起重机传统电控系统中的继电器控制模式和串电阻调速模式已不能满足要求。随着PLC技术和变频器驱动技术的发展,“PLC+变频器”新型控制模式已经出现。将这种新型控制模式引入桅杆式架梁起重机的电气系统设计中,可以简化设计难度、加快设计速度、方便后期安装调试,提高起重机控制性能。以70 t桅杆式起重机为例,从电气系统控制方案和拖动方案设计出发,介绍桅杆式架梁起重机的结构形式,采用全变频及PLC控制模式设计了“PLC+变频器”控制模式的电控系统,并给出了详细的设计思路和设计结果,所提设计具有一定的实用性和借鉴意义。 相似文献
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浅谈PLC控制系统的设计 总被引:5,自引:0,他引:5
可编程控制器(PLC)是一种新型的通用自动化控制装置。通过总结近年来使用PLC的经验,论述了在PLC型号的选择、输入回路的设计、输出回路的设计、扩展模块的选用、控制程序软件的编制等几方面需注意的问题。 相似文献
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针对以往的转子回路的缺陷,采用了PLC控制与变频器相结合的新型调速方式,对提升机的控制系统进行了设计。通过在PLC中编写程序来控制变频器的频率,从而实现提升机S形速度的变化规律。PLC与变频器的有效结合,加上上位机的组态功能,可以达到节能降耗的效果。 相似文献
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斜拉桥拉索检测机器人控制系统设计 总被引:3,自引:0,他引:3
拉索的维护对于斜拉索桥长期的可靠性是至关重要的.为了改进拉索的维护手段,文中提出了一个针对拉索检测机器人控制系统的设计.机器人控制系统包括:运动控制系统、电源监测系统、拉索检测系统、无线通讯系统、主控制器系统及地面监控系统.基于该控制系统设计的拉索检测机器人被用于斜拉桥的拉索检测中.结果表明,该控制系统的设计能较好地实现机器人对斜拉桥拉索的检测. 相似文献
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A Conceptual Approach to Integrate Design and Control for the Epoxy Dispensing Process 总被引:2,自引:0,他引:2
H.-X. Li S.K. Tso H. Deng 《The International Journal of Advanced Manufacturing Technology》2001,17(9):677-682
Performance improvement of manufacturing systems in the semiconductor industry involves interdisciplinary expertise, such
as physical modeling, mechanical design, electrical control, and even material science. Integration of these different disciplines
is a challenging problem in the semiconductor industry. The paper presents a conceptual approach to integrate design and control
methodology for complex processes with specific application to an epoxy-dispensing control system – a critical equipment in
the semiconductor packaging process. This methodology includes three hierarchical levels: process design (system-level and
component-level), multivariable control and the statistics-based supervision. This paper deals with conceptual design at system-level
by integrating an approximate model with an axiomatic approach, and briefly introduces approaches at other levels. In the
conceptual design at system level, the primitive model of the system is sufficient to show some basic properties of the process,
by which the axiomatic design can be easily integrated to evaluate the system design and suggest an optimal system configuration
with invariant properties to internal variations. Under minimal internal variation, the multivariable control that is intended
to suppress external variations can be approximately constructed by a set of independent controllers. Statistics-based supervision
will provide suitable setpoints for the multivariable control so as to maintain good performance in the dynamic environment. 相似文献
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论述了通用型运动控制集成芯片HCTL-1100的工作原理,介绍了基于HCTL-1100的永磁无刷直流电机伺服控系统的硬件、软件设计。在系统硬件设计中,介绍了整个闭环控制系统的硬件电路。在系统软件设计中,介绍了HCTL-1100的四种工作模式,以及如何利用HCTL-1100来实现对永磁无刷直流电机的速度控制和位置伺服。 相似文献
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液压调速控制系统是液压自动控制系统的重要组成部分。就液压调速控制系统的设计作了详细的阐述,包括系统的工作原理、动态分析和微机接口电路设计。此系统的设计对相似液压控制系统的设计具有一定的参考价值。 相似文献
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针对利用反作用飞轮作为执行机构的小卫星姿控系统,设计了基于xPC实时仿真环境、高精度单轴气浮转台、姿控计算机及光纤陀螺和反作用飞轮的卫星姿态控制系统半物理仿真实验平台;并利用该系统对用反作用飞轮的小卫星姿态控制机动模式进行了半物理仿真验证,在50秒内机动了31.57°,并有较好的指向精度和稳定度。结果表明,根据光纤陀螺和反作用飞轮现有特性,设计的姿态控制算法进行机动 能够满足控制系统指标。 相似文献
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为了满足2m口径望远镜低速跟踪精度的要求,本文主要介绍了基于永磁同步力矩电机的望远镜交流伺服控制系统设计方法,首先,辨识出了系统结构的频率特性曲线;其次,根据系统的频率特性曲线设计了结构滤波器,以减小结构模态引起的谐振幅值;然后,根据系统的控制性能指标要求,设计了位置回路控制器和前馈控制器,以提高系统的位置跟踪性能;最后,在设计的硬件平台上进行了望远镜转台的低速控制实验。实验结果显示,当望远镜跟踪斜率为0.36″/s的位置斜坡曲线时,速度平稳性较好,位置跟踪误差RMS为0.006 1″,实现了极低速度跟踪的效果;在速度为5°/s,加速度为2°/s2条件下的正弦引导最大误差值为0.3″,稳态误差RMS值为0.066″。实验结果表明,2m口径望远镜交流伺服系统的设计满足了系统跟踪精度的要求,为大型望远镜交流伺服控制系统的设计提供了一定的参考。 相似文献
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This study presents a time-invariant feedforward (FF) element design for the high-speed and high-precision tracking control of an ultrahigh-acceleration, high-velocity linear synchronous motor (LSM). The linear motor can generate an acceleration greater than 70 G (= 686 m/s2) and move at a velocity above 10 m/s. To take advantage of this performance and realize high response, the design and usage of suitable FF elements is crucial. However, as the LSM includes highly nonlinear characteristics, it is difficult to provide an exact dynamic model for FF design. To overcome this problem, a control system with a learning controller (LC) as the FF element has been designed previously, demonstrating high-precision and high response motion. However, the motion performance can be achieved only with sufficient pre-learned motions. The integrator and the disturbance observer that were effective in suppressing disturbances were removed from the control system. In addition, the control system has some FF time-invariant elements along with the LC. This study proposes a design method for easy design of all FF elements using an LC. The designed FF elements are time invariant and are used with an integrator and a disturbance observer, without pre-learning. Using the proposed method, two sets of time-invariant FF elements are designed. The performances of two control systems, which include a set of time-invariant FF elements for each, and a simple disturbance observer are experimentally examined and compared with two previously designed control systems. Experimental results demonstrate that the performance of one of the control systems with a set of time-invariant FF elements designed in this study and a disturbance observer is good and almost comparable with that of the previously designed control system with high-precision and high response motion. 相似文献