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结合包钢综合料场的现状，详细论述了运用PLC控制技术在工艺工程中的网络结构以及控制原理。系统整体采用调度室与现场相互协作的监控模式，通过光纤环网传输至现场的PLC控制站，由现场各控制器根据实际编写的控制程序来实现设备的启动和停止。实践表明该系统工作可靠，自动化程度高。 相似文献
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In order to investigate the behavior of external welded flange-bolted web joints of steel structure exposed to fire,a series of experiments were carried out.Influence of fire model and load ratio on the behavior of the joints,failure characteristics and fracture modes of the joints exposed to fire were studied.The experimental results indicated that the fire model has a great influence on the temperature rising as well as temperature distribution of the joints exposed to fire.A slower temperature rising fire will lead to slower temperature rising and more uniform temperature distribution of joint.Decrease of the load ratio will improve the fire-resistant capability of the joint.Furthermore,a highly detailed three-dimensional(3-D) finite element model(FEM) was set up with ANSYS software to predict the behavior of the external welded flange-bolted web joints exposed to fire.Comparisons between the predicted results and the experimental results indicated that FEM has an acceptable degree of accuracy to predict the behavior of this type of joints exposed to fire. 相似文献
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