Pub Date : 1999-10-18DOI: 10.1109/ETFA.1999.815367
S. Roch
Signal-event systems provide a modular modelling technique based on Petri nets. Activities of a module can be made possible or can be prevented by another module through conditions. One sided synchronization of modules is done by signal-events, which cause the execution of actions in steps. But due to use of conditions and signal-events it is possible, that the simultaneous firing of steps leads to markings, which are not reachable by normal interleaving. We give a criterion, in which situations simultaneous firing of steps can be safely omitted, without missing reachable markings.
{"title":"Simultaneity in signal-event systems","authors":"S. Roch","doi":"10.1109/ETFA.1999.815367","DOIUrl":"https://doi.org/10.1109/ETFA.1999.815367","url":null,"abstract":"Signal-event systems provide a modular modelling technique based on Petri nets. Activities of a module can be made possible or can be prevented by another module through conditions. One sided synchronization of modules is done by signal-events, which cause the execution of actions in steps. But due to use of conditions and signal-events it is possible, that the simultaneous firing of steps leads to markings, which are not reachable by normal interleaving. We give a criterion, in which situations simultaneous firing of steps can be safely omitted, without missing reachable markings.","PeriodicalId":119106,"journal":{"name":"1999 7th IEEE International Conference on Emerging Technologies and Factory Automation. Proceedings ETFA '99 (Cat. No.99TH8467)","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123488182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-10-18DOI: 10.1109/ETFA.1999.815402
E. Bertran, G. Montoro
An improved adaptive filter for eliminating periodic vibrations of unknown frequency in rotary machinery is presented. The proposed canceller is based on a usual bank of digital adaptive notch filters, each filter tuned in the cancellation of one harmonic. The amplitude and phase of each harmonic is adaptively adjusted by an LMS-based algorithm. Moreover, the central frequency of each notch filter is also adaptively adjusted (fine tuning). The resulting algorithm, tested in an industrial application, shows effectiveness in cancelling unknown periodic disturbances, reducing environmental noise and maintenance problems.
{"title":"Active control of vibrant actuators with adaptive adjustment of the reference","authors":"E. Bertran, G. Montoro","doi":"10.1109/ETFA.1999.815402","DOIUrl":"https://doi.org/10.1109/ETFA.1999.815402","url":null,"abstract":"An improved adaptive filter for eliminating periodic vibrations of unknown frequency in rotary machinery is presented. The proposed canceller is based on a usual bank of digital adaptive notch filters, each filter tuned in the cancellation of one harmonic. The amplitude and phase of each harmonic is adaptively adjusted by an LMS-based algorithm. Moreover, the central frequency of each notch filter is also adaptively adjusted (fine tuning). The resulting algorithm, tested in an industrial application, shows effectiveness in cancelling unknown periodic disturbances, reducing environmental noise and maintenance problems.","PeriodicalId":119106,"journal":{"name":"1999 7th IEEE International Conference on Emerging Technologies and Factory Automation. Proceedings ETFA '99 (Cat. No.99TH8467)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124930035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-10-18DOI: 10.1109/ETFA.1999.815387
V. Sepere, J. Matraix, E. Tordera
The paper introduces a novel video transmission system designed to work over a MAP stack using the MMS protocol. The transmission of images allows powerful remote monitoring capabilities in industrial environments, while the utilization of the versatile MMS protocol gives the system great flexibility and tight integration into factory networks. The main characteristics of the system and the devised protocols are described. Then, a first implementation developed by the authors is presented, demonstrating the viability of the proposal. A preliminary study on the impact of video transmission over network traffic is also presented.
{"title":"Video transmission on industrial processes over MAP networks using MMS","authors":"V. Sepere, J. Matraix, E. Tordera","doi":"10.1109/ETFA.1999.815387","DOIUrl":"https://doi.org/10.1109/ETFA.1999.815387","url":null,"abstract":"The paper introduces a novel video transmission system designed to work over a MAP stack using the MMS protocol. The transmission of images allows powerful remote monitoring capabilities in industrial environments, while the utilization of the versatile MMS protocol gives the system great flexibility and tight integration into factory networks. The main characteristics of the system and the devised protocols are described. Then, a first implementation developed by the authors is presented, demonstrating the viability of the proposal. A preliminary study on the impact of video transmission over network traffic is also presented.","PeriodicalId":119106,"journal":{"name":"1999 7th IEEE International Conference on Emerging Technologies and Factory Automation. Proceedings ETFA '99 (Cat. No.99TH8467)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121764240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-10-18DOI: 10.1109/ETFA.1999.815429
C. Vivas, J. Ortega, M. Vargas
A first approach to the parallel implementation of an automated visual quality inspection (VQI) system for printed ceramic dishes is described. The VQI system is designed to detect defects on the surface drawings of dishes printed automatically by industrial series production. Quality inspection must be accomplished online, so a parallel implementation is proposed to speed up processing. The paper briefly introduces the algorithms employed to accomplish the various steps of quality inspection, focusing on the parallel implementation of such algorithms and the digital signal processor (DSP) platform employed. The results of the experimental tests show classification abilities of the proposed algorithms, as well as performance times for the DSP based hardware platform and parallelization efficiency of VQI algorithms.
{"title":"Parallel DSP based implementation of an automated visual quality inspection system","authors":"C. Vivas, J. Ortega, M. Vargas","doi":"10.1109/ETFA.1999.815429","DOIUrl":"https://doi.org/10.1109/ETFA.1999.815429","url":null,"abstract":"A first approach to the parallel implementation of an automated visual quality inspection (VQI) system for printed ceramic dishes is described. The VQI system is designed to detect defects on the surface drawings of dishes printed automatically by industrial series production. Quality inspection must be accomplished online, so a parallel implementation is proposed to speed up processing. The paper briefly introduces the algorithms employed to accomplish the various steps of quality inspection, focusing on the parallel implementation of such algorithms and the digital signal processor (DSP) platform employed. The results of the experimental tests show classification abilities of the proposed algorithms, as well as performance times for the DSP based hardware platform and parallelization efficiency of VQI algorithms.","PeriodicalId":119106,"journal":{"name":"1999 7th IEEE International Conference on Emerging Technologies and Factory Automation. Proceedings ETFA '99 (Cat. No.99TH8467)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121404833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-10-18DOI: 10.1109/ETFA.1999.815399
F. Espinosa, E. Lopez, R. Mateos, M. Mazo, R. Garcia
Presents the basis and results of the application of advanced digital control techniques to the drive and trajectory tracking systems of a wheelchair for the disabled. The adaptive optimal control of the differential drive of the vehicle contributes to improve the guidance system safety and reliability. Furthermore, the incorporation of an optimal controller in order to minimise the location error and of another fuzzy one to adapt the linear velocity of the vehicle to the characteristics of the trajectory provide the vehicle with a high degree of intelligence and autonomy, even when faced with obstacles.
{"title":"Application of advanced digital control techniques to the drive and trajectory tracking system of a wheelchair for the disabled","authors":"F. Espinosa, E. Lopez, R. Mateos, M. Mazo, R. Garcia","doi":"10.1109/ETFA.1999.815399","DOIUrl":"https://doi.org/10.1109/ETFA.1999.815399","url":null,"abstract":"Presents the basis and results of the application of advanced digital control techniques to the drive and trajectory tracking systems of a wheelchair for the disabled. The adaptive optimal control of the differential drive of the vehicle contributes to improve the guidance system safety and reliability. Furthermore, the incorporation of an optimal controller in order to minimise the location error and of another fuzzy one to adapt the linear velocity of the vehicle to the characteristics of the trajectory provide the vehicle with a high degree of intelligence and autonomy, even when faced with obstacles.","PeriodicalId":119106,"journal":{"name":"1999 7th IEEE International Conference on Emerging Technologies and Factory Automation. Proceedings ETFA '99 (Cat. No.99TH8467)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124110877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-10-18DOI: 10.1109/ETFA.1999.815374
M.A. de Juan, M.A. Leon, B. Martin-Calero, A. Mendoza, A. de los Ojos, J. Perán, L.J. de Miguel
Shows the development steps that have been followed to create a support tool for maintenance and production optimisation of a car factory, based on discrete simulation. In order to develop the tool, it was necessary to build simulation model of the entire car factory. At the beginning of the paper, the logistic parameters are defined. Nowadays, these parameters are used in the car industry. Later, the followed steps in the general factory modelling process are explained. Afterwards, the model created in the project is detailed. The next point indicates how can be fulfilled a general factory analysis with a simulation model. Finally, an example is described and experimental results are showed.
{"title":"Decision making based on a discrete event simulation tool","authors":"M.A. de Juan, M.A. Leon, B. Martin-Calero, A. Mendoza, A. de los Ojos, J. Perán, L.J. de Miguel","doi":"10.1109/ETFA.1999.815374","DOIUrl":"https://doi.org/10.1109/ETFA.1999.815374","url":null,"abstract":"Shows the development steps that have been followed to create a support tool for maintenance and production optimisation of a car factory, based on discrete simulation. In order to develop the tool, it was necessary to build simulation model of the entire car factory. At the beginning of the paper, the logistic parameters are defined. Nowadays, these parameters are used in the car industry. Later, the followed steps in the general factory modelling process are explained. Afterwards, the model created in the project is detailed. The next point indicates how can be fulfilled a general factory analysis with a simulation model. Finally, an example is described and experimental results are showed.","PeriodicalId":119106,"journal":{"name":"1999 7th IEEE International Conference on Emerging Technologies and Factory Automation. Proceedings ETFA '99 (Cat. No.99TH8467)","volume":"62 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129492380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-10-18DOI: 10.1109/ETFA.1999.815370
P. Richard
We study the weighted shortest path problem in a Petri net reachability graph. Given two markings M and M: we want to find the weighted shortest firing sequence that leads from M to M'. We tackle this problem with a two step-procedure : first the optimal characteristic vector is computed, and then a sequence is built. We focus on state machines and live marked graphs. Efficient algorithms based on graph theory are presented to solve the first step. We also give a reachability result based on balanced firing sequences that are dominant for every marked graph. Finally we show that the problems solved at each step are separately NP-hard in the strong sense.
{"title":"Optimal shortest path in reachability graph","authors":"P. Richard","doi":"10.1109/ETFA.1999.815370","DOIUrl":"https://doi.org/10.1109/ETFA.1999.815370","url":null,"abstract":"We study the weighted shortest path problem in a Petri net reachability graph. Given two markings M and M: we want to find the weighted shortest firing sequence that leads from M to M'. We tackle this problem with a two step-procedure : first the optimal characteristic vector is computed, and then a sequence is built. We focus on state machines and live marked graphs. Efficient algorithms based on graph theory are presented to solve the first step. We also give a reachability result based on balanced firing sequences that are dominant for every marked graph. Finally we show that the problems solved at each step are separately NP-hard in the strong sense.","PeriodicalId":119106,"journal":{"name":"1999 7th IEEE International Conference on Emerging Technologies and Factory Automation. Proceedings ETFA '99 (Cat. No.99TH8467)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130061493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-10-18DOI: 10.1109/ETFA.1999.813103
C. Ozsoy, A. Kural, M. Cetinkaya, S. Ertug
The main goal of the raw meal blending control in cement industry is to maintain near the reference moduli values and to decrease the variation of the chemical composition rejecting the disturbances. In this paper, the proposed constrained self-tuning controller deals with not only the quality control but quantity control as well. This is accomplished by inserting a energy term into the quadratic performance index. The self-tuning controller designed according to this performance index bases on a time-series model characterizing relationship between the feed rates and the moduli values. Due to the technological constraints, a optimization problem is formed to compute the control signal. The optimization problem is solved to obtain the least expensive and if possible the least sensitive mix of the raw materials that satisfies the quality requirements of the raw meal under incomplete and stochastic information of the different raw material component concentrations, and further move in real time.
{"title":"Constrained MIMO self-tuning composition control in cement industry","authors":"C. Ozsoy, A. Kural, M. Cetinkaya, S. Ertug","doi":"10.1109/ETFA.1999.813103","DOIUrl":"https://doi.org/10.1109/ETFA.1999.813103","url":null,"abstract":"The main goal of the raw meal blending control in cement industry is to maintain near the reference moduli values and to decrease the variation of the chemical composition rejecting the disturbances. In this paper, the proposed constrained self-tuning controller deals with not only the quality control but quantity control as well. This is accomplished by inserting a energy term into the quadratic performance index. The self-tuning controller designed according to this performance index bases on a time-series model characterizing relationship between the feed rates and the moduli values. Due to the technological constraints, a optimization problem is formed to compute the control signal. The optimization problem is solved to obtain the least expensive and if possible the least sensitive mix of the raw materials that satisfies the quality requirements of the raw meal under incomplete and stochastic information of the different raw material component concentrations, and further move in real time.","PeriodicalId":119106,"journal":{"name":"1999 7th IEEE International Conference on Emerging Technologies and Factory Automation. Proceedings ETFA '99 (Cat. No.99TH8467)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128918298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-10-18DOI: 10.1109/ETFA.1999.815373
A. Dolgui, N. Guschinbsky, G. Levin
A problem of optimal design for a class of automatic production systems is considered. The investigated systems are transfer lines without buffers and with parallel and sequential operations at each workstation. Manufacturing operations for a workstation are partitioned into blocks. All operations of the same block are performed simultaneously, and different blocks are executed sequentially. The relations of necessity and possibility of combining operations in one block and in one workstation as well as precedence constraints are given. Operation time of a block depends of assigned operations, while the operation time of a workstation is the sum of operation times of its blocks. The problem is to minimize the weighted total number of workstations and blocks, providing a given cycle time and satisfying the above constraints. The proposed method is based on reducing the initial problem to the shortest constraint path problem.
{"title":"On problem of optimal design of transfer lines with parallel and sequential operations","authors":"A. Dolgui, N. Guschinbsky, G. Levin","doi":"10.1109/ETFA.1999.815373","DOIUrl":"https://doi.org/10.1109/ETFA.1999.815373","url":null,"abstract":"A problem of optimal design for a class of automatic production systems is considered. The investigated systems are transfer lines without buffers and with parallel and sequential operations at each workstation. Manufacturing operations for a workstation are partitioned into blocks. All operations of the same block are performed simultaneously, and different blocks are executed sequentially. The relations of necessity and possibility of combining operations in one block and in one workstation as well as precedence constraints are given. Operation time of a block depends of assigned operations, while the operation time of a workstation is the sum of operation times of its blocks. The problem is to minimize the weighted total number of workstations and blocks, providing a given cycle time and satisfying the above constraints. The proposed method is based on reducing the initial problem to the shortest constraint path problem.","PeriodicalId":119106,"journal":{"name":"1999 7th IEEE International Conference on Emerging Technologies and Factory Automation. Proceedings ETFA '99 (Cat. No.99TH8467)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116461388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-10-18DOI: 10.1109/ETFA.1999.813134
M.A. Garcia, C. Prada
Distributed control systems (DCS) have been, in the last years, the focus of some proposed and de facto standardizations. The paper describes the configuration aspects of continuous and discrete event control in a DCS implementation called SICODI, and the degree of integration between them. The communication properties when SICODI takes part in a training simulator are presented, and the communication level between the local control units (LCU) of the DCS and their main concepts are outlined. Finally, the monitoring configuration is described and some conclusions and future work pointed out.
{"title":"SICODI: a configurable real-time distributed control system","authors":"M.A. Garcia, C. Prada","doi":"10.1109/ETFA.1999.813134","DOIUrl":"https://doi.org/10.1109/ETFA.1999.813134","url":null,"abstract":"Distributed control systems (DCS) have been, in the last years, the focus of some proposed and de facto standardizations. The paper describes the configuration aspects of continuous and discrete event control in a DCS implementation called SICODI, and the degree of integration between them. The communication properties when SICODI takes part in a training simulator are presented, and the communication level between the local control units (LCU) of the DCS and their main concepts are outlined. Finally, the monitoring configuration is described and some conclusions and future work pointed out.","PeriodicalId":119106,"journal":{"name":"1999 7th IEEE International Conference on Emerging Technologies and Factory Automation. Proceedings ETFA '99 (Cat. No.99TH8467)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126590060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：