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A MODEL AND AN ANALYTICAL METHOD FOR conveyor systemS IN DISTRIBUTION CENTERS

Journal of systems Science and systems Engineering 2010年第4期19卷 408-429页

作者： Ying WANG Chen ZHOU Manheim Consulting USA Stewart School of Industrial and systems Engineering Georgia Institute of Technology USA

The design and operation of high volume conveyor systems in distribution centers are important due to its high cost, large footprint and critical role in the system. However, there is no analytical model available. In this paper, we study the characteristics of the conveyor sortation system, develop a generic model of a complex conveyor network. We then use the Delay and Stock abstraction to develop an approximate analytical method using sample path analysis and dynamic network flow model. The decision variables include length of accumulation segments and the speeds of conveyor components aforementioned decision variables. This analytical solution provides faster analysis, insights and useful subgradient with respect to the decision variables.

关键词： conveyor system sortation system network accumulation sample path analysis dynamic network flow

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Real Time Automation and Ratio Control Using PLC&SCADA in Industry 4.0

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Computer systems Science & Engineering 2023年第5期45卷 1495-1516页

作者： Basant Tomar Narendra Kumar Mini Sreejeth Dept of Electrical Engineering Delhi Technological UniversityDelhi 110042India

Industrial Control systems(ICS)and SCADA(Supervisory Control and Data Acquisition)systems play a critical role in the management and regulation of critical *** systems brings us closer to the real-time application *** process and equipment control capability is typically provided by a Distributed Control system(DCS)in industries such as power stations,agricultural systems,chemical and water treatment *** of control through DCS,this paper proposes a SCADA and PLC(Programmable Logic Controller)system to control the ratio control division and the assembly line division inside the chemical plant.A specific design and implementation method for development of SCADA/PLC based real time ratio control and automated assembly line system in a chemical plant is *** assembly line division is further divided into sorting stage,filling stage and the auxiliary stage,which includes the capping unit,labelling unit and then the *** the ratio control division,we have defined the levels inside the mixer and ratio of the raw materials through human machine interface(HMI)*** ratio of raw materials is kept constant on the basis of flow rates of wild stream and manipulated *** is a flexibility in defining new levels and the ratios of the raw materials inside the *** here we taken the predefined levels(low,medium,high)and ratios(3:4,2:1,2:5).Control valves are used for regulating the flow of the *** the assembly line division,the containers are sorted on the basis of size and type of material used i.e.,big sized metallic containers and small sized non-metallic containers by inductive and capacitive proximity *** the processes are facilitated with laser beam type or reflective type sensors on the conveyor *** a highly stable and dependable PLC/SCADA system instead of Distributed Control system is required to achieve automatic management and control of chemical industry processes to reduce

关键词： Industry 4.0 ratio control automation PLC SCADA control valves proximity sensors conveyor system solenoid valves

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