Pub Date : 1990-03-11DOI: 10.1109/SSST.1990.138156
O. Ojo
Summary form only given. A simplified approach to studying the phenomenon of self-excitation in induction generators, based on the concept of static bifurcation and the q-d equivalent circuit equation in the synchronous reference frame, is proposed. This approach provides the necessary framework for identifying the boundary of possible self-excitation for a generalized load comprising both resistive and inductive loads. Example of these boundaries are shown. The limitation of capacitive self-excited induction generator operation has been determined, and suggestions as to how constant voltage and frequency power can be attained have been derived on the basis of the bifurcation fields. For the cases in which the reactive power is provided from a pulsewidth-modulated inverter, it has been shown how the switching frequency and the effective value of the inverter capacitance can be appropriately and structurally manipulated to obtain constant voltage and constant frequency power from the generator.<>
{"title":"Static bifurcation in induction generators","authors":"O. Ojo","doi":"10.1109/SSST.1990.138156","DOIUrl":"https://doi.org/10.1109/SSST.1990.138156","url":null,"abstract":"Summary form only given. A simplified approach to studying the phenomenon of self-excitation in induction generators, based on the concept of static bifurcation and the q-d equivalent circuit equation in the synchronous reference frame, is proposed. This approach provides the necessary framework for identifying the boundary of possible self-excitation for a generalized load comprising both resistive and inductive loads. Example of these boundaries are shown. The limitation of capacitive self-excited induction generator operation has been determined, and suggestions as to how constant voltage and frequency power can be attained have been derived on the basis of the bifurcation fields. For the cases in which the reactive power is provided from a pulsewidth-modulated inverter, it has been shown how the switching frequency and the effective value of the inverter capacitance can be appropriately and structurally manipulated to obtain constant voltage and constant frequency power from the generator.<<ETX>>","PeriodicalId":201543,"journal":{"name":"[1990] Proceedings. The Twenty-Second Southeastern Symposium on System Theory","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114604612","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 : 1990-03-11DOI: 10.1109/SSST.1990.138210
Q. Sun, J.N. Anderson, A. Alouani
The authors present a real-time estimation scheme for improving wrist force/torque sensor measurements through a data fusion technique. The currents of joint servomotors are measured as a redundant data source for data fusion. The computational results of the model-based control method are used to reduce the extra amount of computation required for estimation. Robot joints are fully instrumented to obtain necessary dynamic information about robot motion. Simulation results reveal that the performance of the estimation scheme depends on the sampling period of the robot controller and the a priori knowledge of the measurement noise processes.<>
{"title":"Improving wrist force/torque sensor measurements through a data fusion technique","authors":"Q. Sun, J.N. Anderson, A. Alouani","doi":"10.1109/SSST.1990.138210","DOIUrl":"https://doi.org/10.1109/SSST.1990.138210","url":null,"abstract":"The authors present a real-time estimation scheme for improving wrist force/torque sensor measurements through a data fusion technique. The currents of joint servomotors are measured as a redundant data source for data fusion. The computational results of the model-based control method are used to reduce the extra amount of computation required for estimation. Robot joints are fully instrumented to obtain necessary dynamic information about robot motion. Simulation results reveal that the performance of the estimation scheme depends on the sampling period of the robot controller and the a priori knowledge of the measurement noise processes.<<ETX>>","PeriodicalId":201543,"journal":{"name":"[1990] Proceedings. The Twenty-Second Southeastern Symposium on System Theory","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124183407","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 : 1990-03-11DOI: 10.1109/SSST.1990.138206
A. Kanekar, A. Feliachi
The state estimation problem is addressed using artificial neural networks. The neural networks used are the adaptive linear combiner and a multilayer net. Training is performed by using several Kalman filter solutions to set the different weights. The derived neural network estimator gives state estimates when the system is subjected to unknown noises. Examples are given to illustrate the proposed approach.<>
{"title":"State estimation using artificial neural networks","authors":"A. Kanekar, A. Feliachi","doi":"10.1109/SSST.1990.138206","DOIUrl":"https://doi.org/10.1109/SSST.1990.138206","url":null,"abstract":"The state estimation problem is addressed using artificial neural networks. The neural networks used are the adaptive linear combiner and a multilayer net. Training is performed by using several Kalman filter solutions to set the different weights. The derived neural network estimator gives state estimates when the system is subjected to unknown noises. Examples are given to illustrate the proposed approach.<<ETX>>","PeriodicalId":201543,"journal":{"name":"[1990] Proceedings. The Twenty-Second Southeastern Symposium on System Theory","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130559503","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 : 1990-03-11DOI: 10.1109/SSST.1990.138114
M. Noakes
The development of an expert system for optimizing the controls tuning of a gear and shaft force-reflecting servomanipulator is discussed. Remote maintenance techniques have produced hot-cell manipulators that do not require hands-on-repair. However, these manipulators are difficult to tune owing to the conflicting priorities of maximizing operator sensation of force reflection and minimizing operator fatigue in combination with the complex nonlinear control algorithms and cross-coupled motions. Owing to the heuristic nature of this tuning problem and the emphasis on human perception of performance, an expert system has been developed as an alternative to algorithmic optimization of gains.<>
{"title":"Teleoperator servoloop tuning using an expert system","authors":"M. Noakes","doi":"10.1109/SSST.1990.138114","DOIUrl":"https://doi.org/10.1109/SSST.1990.138114","url":null,"abstract":"The development of an expert system for optimizing the controls tuning of a gear and shaft force-reflecting servomanipulator is discussed. Remote maintenance techniques have produced hot-cell manipulators that do not require hands-on-repair. However, these manipulators are difficult to tune owing to the conflicting priorities of maximizing operator sensation of force reflection and minimizing operator fatigue in combination with the complex nonlinear control algorithms and cross-coupled motions. Owing to the heuristic nature of this tuning problem and the emphasis on human perception of performance, an expert system has been developed as an alternative to algorithmic optimization of gains.<<ETX>>","PeriodicalId":201543,"journal":{"name":"[1990] Proceedings. The Twenty-Second Southeastern Symposium on System Theory","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130267771","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 : 1990-03-11DOI: 10.1109/SSST.1990.138125
X. Yang, A. Feliachi
The author's present a methodology for determining, in a large-scale system, the number of decentralized controllers necessary to control a set of critical eigenvalues, and to identify their optimal locations. The method is based on residues. A multimachine power system example is given to illustrate the proposed technique.<>
{"title":"Identification of optimal locations for decentralized controllers using residues","authors":"X. Yang, A. Feliachi","doi":"10.1109/SSST.1990.138125","DOIUrl":"https://doi.org/10.1109/SSST.1990.138125","url":null,"abstract":"The author's present a methodology for determining, in a large-scale system, the number of decentralized controllers necessary to control a set of critical eigenvalues, and to identify their optimal locations. The method is based on residues. A multimachine power system example is given to illustrate the proposed technique.<<ETX>>","PeriodicalId":201543,"journal":{"name":"[1990] Proceedings. The Twenty-Second Southeastern Symposium on System Theory","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130832332","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 : 1990-03-11DOI: 10.1109/SSST.1990.138172
D.A. Gwaltney, M. Greene
The preliminary design of a reel mechanism for the control of the GetAway Tether Experiment (GATE) is presented. The GATE is now part of the Tether Dynamics Explorer series (TDE) and consists of a small subsatellite tethered to a large body (Delta II second stage). A reel mechanism is housed in the subsatellite and used as the primary means of attitude control of the tether and subsatellite. Concepts used for the implementation of control software are discussed, and preliminary testing procedures are described. Results showing the capability of the prototype are presented and discussed.<>
{"title":"Design of a reel mechanism for control of an orbiting single tether system","authors":"D.A. Gwaltney, M. Greene","doi":"10.1109/SSST.1990.138172","DOIUrl":"https://doi.org/10.1109/SSST.1990.138172","url":null,"abstract":"The preliminary design of a reel mechanism for the control of the GetAway Tether Experiment (GATE) is presented. The GATE is now part of the Tether Dynamics Explorer series (TDE) and consists of a small subsatellite tethered to a large body (Delta II second stage). A reel mechanism is housed in the subsatellite and used as the primary means of attitude control of the tether and subsatellite. Concepts used for the implementation of control software are discussed, and preliminary testing procedures are described. Results showing the capability of the prototype are presented and discussed.<<ETX>>","PeriodicalId":201543,"journal":{"name":"[1990] Proceedings. The Twenty-Second Southeastern Symposium on System Theory","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128865799","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 : 1990-03-11DOI: 10.1109/SSST.1990.138167
M.K. Celik, P. Hays, R. Pieper
A model that assumes tonal decomposition of textures is proposed for texture segmentation. The model assumes that the tones form an orthogonal basis in a vector space of possible textures. Two methods for texture segmentation that use a texture indicator developed from this concept are demonstrated.<>
{"title":"A vector model for tonal decomposition and segmentation of textures","authors":"M.K. Celik, P. Hays, R. Pieper","doi":"10.1109/SSST.1990.138167","DOIUrl":"https://doi.org/10.1109/SSST.1990.138167","url":null,"abstract":"A model that assumes tonal decomposition of textures is proposed for texture segmentation. The model assumes that the tones form an orthogonal basis in a vector space of possible textures. Two methods for texture segmentation that use a texture indicator developed from this concept are demonstrated.<<ETX>>","PeriodicalId":201543,"journal":{"name":"[1990] Proceedings. The Twenty-Second Southeastern Symposium on System Theory","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127197212","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 : 1990-03-11DOI: 10.1109/SSST.1990.138180
G. Nasr, B. Leon
The design and analysis of electronic systems often require determination of the steady state response of nonlinear circuits. The purpose of the paper is to reexamine some of the well known facts about nonlinear systems and their analysis. For nonlinear systems there may be two or more different steady-state responses, as in the case of jump resonance; there can be responses of different periods, as in the case of subharmonics; or there can be a nonperiodic response, as in the case of systems that exhibit chaos. This work deals with the application of iteration and Volterra series analysis methods to certain types of problems with interesting solutions. In particular, the jump resonance phenomenon and the initial conditions leading to different harmonic solutions are considered.<>
{"title":"Forced systems with multiple steady states","authors":"G. Nasr, B. Leon","doi":"10.1109/SSST.1990.138180","DOIUrl":"https://doi.org/10.1109/SSST.1990.138180","url":null,"abstract":"The design and analysis of electronic systems often require determination of the steady state response of nonlinear circuits. The purpose of the paper is to reexamine some of the well known facts about nonlinear systems and their analysis. For nonlinear systems there may be two or more different steady-state responses, as in the case of jump resonance; there can be responses of different periods, as in the case of subharmonics; or there can be a nonperiodic response, as in the case of systems that exhibit chaos. This work deals with the application of iteration and Volterra series analysis methods to certain types of problems with interesting solutions. In particular, the jump resonance phenomenon and the initial conditions leading to different harmonic solutions are considered.<<ETX>>","PeriodicalId":201543,"journal":{"name":"[1990] Proceedings. The Twenty-Second Southeastern Symposium on System Theory","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125834605","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 : 1990-03-11DOI: 10.1109/SSST.1990.138127
X. Zhang, A. Filiachi
The authors present a methodology for identifying the critical modes of large-scale systems excited by several input functions, including step and impulse functions. A quadratic performance measure is defined. This index is related to the type of application under consideration. For example, the index can be a function of the output variables or some other desired state variables. Each eigenvalue is evaluated by assessing its contribution to that performance index. The eigenvalues that contribute the most to the performance measure are identified as the critical modes. An algorithm is derived, and an example is given to illustrate the proposed method.<>
{"title":"Identification of critical modes of large-scale systems excited with several input functions","authors":"X. Zhang, A. Filiachi","doi":"10.1109/SSST.1990.138127","DOIUrl":"https://doi.org/10.1109/SSST.1990.138127","url":null,"abstract":"The authors present a methodology for identifying the critical modes of large-scale systems excited by several input functions, including step and impulse functions. A quadratic performance measure is defined. This index is related to the type of application under consideration. For example, the index can be a function of the output variables or some other desired state variables. Each eigenvalue is evaluated by assessing its contribution to that performance index. The eigenvalues that contribute the most to the performance measure are identified as the critical modes. An algorithm is derived, and an example is given to illustrate the proposed method.<<ETX>>","PeriodicalId":201543,"journal":{"name":"[1990] Proceedings. The Twenty-Second Southeastern Symposium on System Theory","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126149632","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 : 1990-03-11DOI: 10.1109/SSST.1990.138212
G. Seetharaman, Chee-Hung Henry Cliu
The information content of an image is determined by the dynamic range of the sensor and the characteristics of the signal being recorded by the sensor. The integration of information from images from different types of sensors poses several interesting subproblems that are handled in a hierarchical manner. The authors place their discussion of these problems in the context of image segmentation. Integration may take place at various levels, ranging from pixel level to logical concepts such as features, objects, and scenes. The authors give an account of their initial efforts in dealing with sensor fusion for object recognition, and they study the aspects of image segmentation in the context of sensor fusion.<>
{"title":"Image segmentation by multisensor data-fusion","authors":"G. Seetharaman, Chee-Hung Henry Cliu","doi":"10.1109/SSST.1990.138212","DOIUrl":"https://doi.org/10.1109/SSST.1990.138212","url":null,"abstract":"The information content of an image is determined by the dynamic range of the sensor and the characteristics of the signal being recorded by the sensor. The integration of information from images from different types of sensors poses several interesting subproblems that are handled in a hierarchical manner. The authors place their discussion of these problems in the context of image segmentation. Integration may take place at various levels, ranging from pixel level to logical concepts such as features, objects, and scenes. The authors give an account of their initial efforts in dealing with sensor fusion for object recognition, and they study the aspects of image segmentation in the context of sensor fusion.<<ETX>>","PeriodicalId":201543,"journal":{"name":"[1990] Proceedings. The Twenty-Second Southeastern Symposium on System Theory","volume":"114 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123505709","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}
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