Proceedings of the Thirty-Second International Matador Conference, 1997
Flexible manufacturing systems (FMS) consists of a set of numerically controlled machines, materi... more Flexible manufacturing systems (FMS) consists of a set of numerically controlled machines, material handling systems (MHS), information system and service centres all working towards a common production schedule goal being the achievement of economic product manufacture in short period of time[1]. An FMS is highly versatile production system capable of performing many different operations given the proper tooling, fixtures and materials. Another feature of this system is the short switching time between different operations assigned to its individual workstations. An FMS to function effectively must have an on-line control system capable of reacting quickly to any problem occurring in the system by providing decisions to deal with the problem in a short period of time. The FMS control system thus needs to receive accurate and reliable information from the shop floor. The operational control of an FMS in general involves accessing a large set of static and dynamic data, and requires ...
Abstract Recent results are given on a computer-aided analytic/simulation methodology for designi... more Abstract Recent results are given on a computer-aided analytic/simulation methodology for designing a class of realizable FMS scheduling controls. It is implemented by means of a PC-oriented program package, PETSIM, written in C+. It encompasses a bounded iterative sequence of dual-model building, simulation and performance evaluation based on Stochastic Petri Nets and Queueing Networks so that a sub-optimal plant activity sequence is obtained, and a Petri-net controller model derived. Analytic formulae are derived indicating lower and upper bounds on the desired solutions, together with simulation results.
Abstract A modern discontinuous control strategy, based on variable-structure systems control, is... more Abstract A modern discontinuous control strategy, based on variable-structure systems control, is proven to be vastly more efficient than the commonly used (optimal) on-off control without the need for additional hardware. It may be acheived, however, on the expence of a higher actuator switching frequency. A wider application in energy control and management systems is suggested.
WCBSL is a Windows Convolution-Based Simulation Language for time-domain analysis and design of l... more WCBSL is a Windows Convolution-Based Simulation Language for time-domain analysis and design of linear feedback systems based on convolution algebra The theoretical basis is outlined and the language and methodology are illustrated. Characteristic patterns and vectors are defined and the effect of delay is considered-Dynamic criteria for choosing between decentralized and multivariable control are illustrated using the model of an industrial air compressor.
A modern discontinuous control strategy, based on variable-structure systems control, is proven t... more A modern discontinuous control strategy, based on variable-structure systems control, is proven to be vastly more efficient than the commonly used (optimal) on-off control without the need for additional hardware. It may be acheived, however, on the expence of a higher actuator switching frequency. A wider application in energy control and management systems is suggested.
This paper present the main results of the research devoted to the simulation, modeling and Two-l... more This paper present the main results of the research devoted to the simulation, modeling and Two-level Control of Robotics Flexible Manufacturing Systems - FMS. The essential attributes in the paper definition and, consequently, the research accomplished results obtained are the paradigms of object-oriented modeling (in the sense of software engineering) and of distributed intei-ligence (in the sense of systems-control structure and machine intelligence). A simulation model of so-called 'medium scale' as a representative prototype of a Case Study has been developed. For these needs, there has been developed its object-oriented (software) model, the set of communication finite-state automata and a respecti-ve set of control strategies. Program package PETSIM has been applied for the purpose of simulation of the models and of performance evaluation.
Proceedings of the Thirty-Second International Matador Conference, 1997
Flexible manufacturing systems (FMS) consists of a set of numerically controlled machines, materi... more Flexible manufacturing systems (FMS) consists of a set of numerically controlled machines, material handling systems (MHS), information system and service centres all working towards a common production schedule goal being the achievement of economic product manufacture in short period of time[1]. An FMS is highly versatile production system capable of performing many different operations given the proper tooling, fixtures and materials. Another feature of this system is the short switching time between different operations assigned to its individual workstations. An FMS to function effectively must have an on-line control system capable of reacting quickly to any problem occurring in the system by providing decisions to deal with the problem in a short period of time. The FMS control system thus needs to receive accurate and reliable information from the shop floor. The operational control of an FMS in general involves accessing a large set of static and dynamic data, and requires complex control algorithms. This paper presents a control system developed for real-time operational control of an FMS. The system is organised hierarchically, each level responsible for making decisions according to the operational needs and the time criticality of the particular level. The overall aim of the control system is to optimise FMS performance while meeting the production requirements.
ABSTRACT A computer-aided study of class of fuzzy-logic algorithms for planery navigation of a fa... more ABSTRACT A computer-aided study of class of fuzzy-logic algorithms for planery navigation of a factory-floor vehicle robot is presented. It is based on the cooperation of Zadeh' fuzzy logic approximate reasoning and a three range proximity sensory feedback fusion. Structured algorithms involving fuzzy logic subalgorithms include go-around avoidance of immobile obstacles and on-route course re-direction to the destination.
Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics, 2000
A generic fuzzy controller aimed at controlling MIMO processes with uncertain models has been des... more A generic fuzzy controller aimed at controlling MIMO processes with uncertain models has been designed and tested by means of simulation experiments using identified models of industrial as well as laboratory scale plants. It is essentially based on fuzzy logic algorithms and the class of triangle-induced fuzzy sets. It is of expert system type and uses the information on `error'
A generic fuzzy controller aimed at controlling MIMO processes with uncertain models has been des... more A generic fuzzy controller aimed at controlling MIMO processes with uncertain models has been designed and tested by means of simulation experiments using identified models of industrial as well as laboratory scale plants. It is essentially based on fuzzy logic algorithms and the class of triangle-induced fuzzy sets. It is of expert system type and uses the information on `error'
In an electroplating process plant, the continuous maintenance of the optimum condition of proces... more In an electroplating process plant, the continuous maintenance of the optimum condition of process solution in the process tanks along the production line is essential for achieving the final desired quality in products. Parameters such as current density, temperature, agitation system, bath pH, bath concentration and plating time are known to have important role in determining the quality of the plating products and the productivity of the plating process plant. This paper presents the works being carried out by the authors in developing smart sensors and smart actuators for measurement and control of values of these parameters, and use of these smart devices for transforming the process tanks into smart tank stations to enable the tanks to monitor the condition of process solution along the line and maintain the desired process solution condition for achieving specific quality in plating products. The paper explains the ways the smart devices installed in or used around the tank stations and the use of ThingSpeak in developing smart tank stations.
This paper presents the design and development of an integrated real-time monitoring and control ... more This paper presents the design and development of an integrated real-time monitoring and control system for an electroplating plant. The system uses ZigBee–based wireless communications technology to facilitate short range monitoring and control of process parameters at plant level whilst embedding cloud computing facilities and IoT-based technology to enable real-time responses to process disturbances from anywhere anytime, realising the potential for real time process monitoring and product quality management in an electroplating plant. The paper explains in detail the implementation of a component of the system that monitors and maintains the process solution temperature.
International Federation of Automatic Control. World …, 1997
Abstract: In this paper, the authors present a technique, using fuzzy control algorithms, to simu... more Abstract: In this paper, the authors present a technique, using fuzzy control algorithms, to simulate the motion of automated guided vehicle systems (AGVS) through an area contained obstacles. The scheme is extended to give more intelligent control by ...
Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics, 1994
A methodology of studying and designing scheduling control algorithms and the Petri-net superviso... more A methodology of studying and designing scheduling control algorithms and the Petri-net supervisor implementing them for a robotised FMS has been developed. It is of analytic-simulation type, the analytic part, using Petri-net modelling and the simulation part using animation. It makes visually tangible the FMS processes and reveals inconsistency as error in the derived scheduling control algorithms
Page 1. COMPUTER-AIDED GRAPH-NETWRK PATH-MOTION RECOGMTION IN ROBO11zED MlMO FMS STRUCTURES 0. L.... more Page 1. COMPUTER-AIDED GRAPH-NETWRK PATH-MOTION RECOGMTION IN ROBO11zED MlMO FMS STRUCTURES 0. L. I (Lev' .G U. Dimtrouski' ,U. E. Gough', K. U . Henry3 and B. R. Perci*ova* I AS-ETF. Cyril and Methodius University, POB 574. YIOOO Skopje. ...
Proceedings of the Thirty-Second International Matador Conference, 1997
Flexible manufacturing systems (FMS) consists of a set of numerically controlled machines, materi... more Flexible manufacturing systems (FMS) consists of a set of numerically controlled machines, material handling systems (MHS), information system and service centres all working towards a common production schedule goal being the achievement of economic product manufacture in short period of time[1]. An FMS is highly versatile production system capable of performing many different operations given the proper tooling, fixtures and materials. Another feature of this system is the short switching time between different operations assigned to its individual workstations. An FMS to function effectively must have an on-line control system capable of reacting quickly to any problem occurring in the system by providing decisions to deal with the problem in a short period of time. The FMS control system thus needs to receive accurate and reliable information from the shop floor. The operational control of an FMS in general involves accessing a large set of static and dynamic data, and requires ...
Abstract Recent results are given on a computer-aided analytic/simulation methodology for designi... more Abstract Recent results are given on a computer-aided analytic/simulation methodology for designing a class of realizable FMS scheduling controls. It is implemented by means of a PC-oriented program package, PETSIM, written in C+. It encompasses a bounded iterative sequence of dual-model building, simulation and performance evaluation based on Stochastic Petri Nets and Queueing Networks so that a sub-optimal plant activity sequence is obtained, and a Petri-net controller model derived. Analytic formulae are derived indicating lower and upper bounds on the desired solutions, together with simulation results.
Abstract A modern discontinuous control strategy, based on variable-structure systems control, is... more Abstract A modern discontinuous control strategy, based on variable-structure systems control, is proven to be vastly more efficient than the commonly used (optimal) on-off control without the need for additional hardware. It may be acheived, however, on the expence of a higher actuator switching frequency. A wider application in energy control and management systems is suggested.
WCBSL is a Windows Convolution-Based Simulation Language for time-domain analysis and design of l... more WCBSL is a Windows Convolution-Based Simulation Language for time-domain analysis and design of linear feedback systems based on convolution algebra The theoretical basis is outlined and the language and methodology are illustrated. Characteristic patterns and vectors are defined and the effect of delay is considered-Dynamic criteria for choosing between decentralized and multivariable control are illustrated using the model of an industrial air compressor.
A modern discontinuous control strategy, based on variable-structure systems control, is proven t... more A modern discontinuous control strategy, based on variable-structure systems control, is proven to be vastly more efficient than the commonly used (optimal) on-off control without the need for additional hardware. It may be acheived, however, on the expence of a higher actuator switching frequency. A wider application in energy control and management systems is suggested.
This paper present the main results of the research devoted to the simulation, modeling and Two-l... more This paper present the main results of the research devoted to the simulation, modeling and Two-level Control of Robotics Flexible Manufacturing Systems - FMS. The essential attributes in the paper definition and, consequently, the research accomplished results obtained are the paradigms of object-oriented modeling (in the sense of software engineering) and of distributed intei-ligence (in the sense of systems-control structure and machine intelligence). A simulation model of so-called 'medium scale' as a representative prototype of a Case Study has been developed. For these needs, there has been developed its object-oriented (software) model, the set of communication finite-state automata and a respecti-ve set of control strategies. Program package PETSIM has been applied for the purpose of simulation of the models and of performance evaluation.
Proceedings of the Thirty-Second International Matador Conference, 1997
Flexible manufacturing systems (FMS) consists of a set of numerically controlled machines, materi... more Flexible manufacturing systems (FMS) consists of a set of numerically controlled machines, material handling systems (MHS), information system and service centres all working towards a common production schedule goal being the achievement of economic product manufacture in short period of time[1]. An FMS is highly versatile production system capable of performing many different operations given the proper tooling, fixtures and materials. Another feature of this system is the short switching time between different operations assigned to its individual workstations. An FMS to function effectively must have an on-line control system capable of reacting quickly to any problem occurring in the system by providing decisions to deal with the problem in a short period of time. The FMS control system thus needs to receive accurate and reliable information from the shop floor. The operational control of an FMS in general involves accessing a large set of static and dynamic data, and requires complex control algorithms. This paper presents a control system developed for real-time operational control of an FMS. The system is organised hierarchically, each level responsible for making decisions according to the operational needs and the time criticality of the particular level. The overall aim of the control system is to optimise FMS performance while meeting the production requirements.
ABSTRACT A computer-aided study of class of fuzzy-logic algorithms for planery navigation of a fa... more ABSTRACT A computer-aided study of class of fuzzy-logic algorithms for planery navigation of a factory-floor vehicle robot is presented. It is based on the cooperation of Zadeh' fuzzy logic approximate reasoning and a three range proximity sensory feedback fusion. Structured algorithms involving fuzzy logic subalgorithms include go-around avoidance of immobile obstacles and on-route course re-direction to the destination.
Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics, 2000
A generic fuzzy controller aimed at controlling MIMO processes with uncertain models has been des... more A generic fuzzy controller aimed at controlling MIMO processes with uncertain models has been designed and tested by means of simulation experiments using identified models of industrial as well as laboratory scale plants. It is essentially based on fuzzy logic algorithms and the class of triangle-induced fuzzy sets. It is of expert system type and uses the information on `error'
A generic fuzzy controller aimed at controlling MIMO processes with uncertain models has been des... more A generic fuzzy controller aimed at controlling MIMO processes with uncertain models has been designed and tested by means of simulation experiments using identified models of industrial as well as laboratory scale plants. It is essentially based on fuzzy logic algorithms and the class of triangle-induced fuzzy sets. It is of expert system type and uses the information on `error'
In an electroplating process plant, the continuous maintenance of the optimum condition of proces... more In an electroplating process plant, the continuous maintenance of the optimum condition of process solution in the process tanks along the production line is essential for achieving the final desired quality in products. Parameters such as current density, temperature, agitation system, bath pH, bath concentration and plating time are known to have important role in determining the quality of the plating products and the productivity of the plating process plant. This paper presents the works being carried out by the authors in developing smart sensors and smart actuators for measurement and control of values of these parameters, and use of these smart devices for transforming the process tanks into smart tank stations to enable the tanks to monitor the condition of process solution along the line and maintain the desired process solution condition for achieving specific quality in plating products. The paper explains the ways the smart devices installed in or used around the tank stations and the use of ThingSpeak in developing smart tank stations.
This paper presents the design and development of an integrated real-time monitoring and control ... more This paper presents the design and development of an integrated real-time monitoring and control system for an electroplating plant. The system uses ZigBee–based wireless communications technology to facilitate short range monitoring and control of process parameters at plant level whilst embedding cloud computing facilities and IoT-based technology to enable real-time responses to process disturbances from anywhere anytime, realising the potential for real time process monitoring and product quality management in an electroplating plant. The paper explains in detail the implementation of a component of the system that monitors and maintains the process solution temperature.
International Federation of Automatic Control. World …, 1997
Abstract: In this paper, the authors present a technique, using fuzzy control algorithms, to simu... more Abstract: In this paper, the authors present a technique, using fuzzy control algorithms, to simulate the motion of automated guided vehicle systems (AGVS) through an area contained obstacles. The scheme is extended to give more intelligent control by ...
Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics, 1994
A methodology of studying and designing scheduling control algorithms and the Petri-net superviso... more A methodology of studying and designing scheduling control algorithms and the Petri-net supervisor implementing them for a robotised FMS has been developed. It is of analytic-simulation type, the analytic part, using Petri-net modelling and the simulation part using animation. It makes visually tangible the FMS processes and reveals inconsistency as error in the derived scheduling control algorithms
Page 1. COMPUTER-AIDED GRAPH-NETWRK PATH-MOTION RECOGMTION IN ROBO11zED MlMO FMS STRUCTURES 0. L.... more Page 1. COMPUTER-AIDED GRAPH-NETWRK PATH-MOTION RECOGMTION IN ROBO11zED MlMO FMS STRUCTURES 0. L. I (Lev' .G U. Dimtrouski' ,U. E. Gough', K. U . Henry3 and B. R. Perci*ova* I AS-ETF. Cyril and Methodius University, POB 574. YIOOO Skopje. ...
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