Pub Date : 1900-01-01DOI: 10.1109/ICSYSE.1991.161137
E. Mu, J. T. Cain
Based on strict matching conditions and a linear parameterization assumption, a certainty equivalence control law to pseudolinearize nonlinear systems in the presence of parametric uncertainty is designed. Stability of the origin and state regulation are guaranteed in the vicinity of any equilibrium point of the nonlinear system. These are the first results reported for the pseudolinearization of a class of nonlinear systems with uncertain parameter knowledge.<>
{"title":"Robust pseudolinearization of nonlinear systems","authors":"E. Mu, J. T. Cain","doi":"10.1109/ICSYSE.1991.161137","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161137","url":null,"abstract":"Based on strict matching conditions and a linear parameterization assumption, a certainty equivalence control law to pseudolinearize nonlinear systems in the presence of parametric uncertainty is designed. Stability of the origin and state regulation are guaranteed in the vicinity of any equilibrium point of the nonlinear system. These are the first results reported for the pseudolinearization of a class of nonlinear systems with uncertain parameter knowledge.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"232 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133971255","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161084
D. Hung, S. Phillips
A controller design method based on convex programming is used for lightly damped systems with feedback delay. The designed controllers are robust with respect to time delays in the feedback action, which is often crucial to the stability of lightly damped systems. Exogenous disturbances and unmodeled dynamics are taken into account. Since the convex program is a global optimal technique, once a controller is found, it is optimal in the sense that it meets the design specifications. On the other hand, if no solution is found, then there exists no linear, time-invariant controller which can satisfy the design specifications. Simulation results show that the designed controller can effectively stabilize the lightly damped system and significantly improve its performance.<>
{"title":"Robust controller design for lightly damped systems with feedback delay","authors":"D. Hung, S. Phillips","doi":"10.1109/ICSYSE.1991.161084","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161084","url":null,"abstract":"A controller design method based on convex programming is used for lightly damped systems with feedback delay. The designed controllers are robust with respect to time delays in the feedback action, which is often crucial to the stability of lightly damped systems. Exogenous disturbances and unmodeled dynamics are taken into account. Since the convex program is a global optimal technique, once a controller is found, it is optimal in the sense that it meets the design specifications. On the other hand, if no solution is found, then there exists no linear, time-invariant controller which can satisfy the design specifications. Simulation results show that the designed controller can effectively stabilize the lightly damped system and significantly improve its performance.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131465704","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161106
D. Hawkins, H. Adeli
A prototype knowledge-based expert system developed for design of composite floor systems in multistory buildings is discussed. The design system is in accordance with the 1986 American Institute of Steel Construction (AISC) load and resistance factor design (LRFD) specification. Design options include design for practical minimum cost or for minimum depth. The artificial intelligence (AI) technology complements the traditional numerical processing in automating the complex problem of integrated engineering design and developing intelligent software packages that can interact with the user at a high level.<>
{"title":"Knowledge-based approach for composite floor system design","authors":"D. Hawkins, H. Adeli","doi":"10.1109/ICSYSE.1991.161106","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161106","url":null,"abstract":"A prototype knowledge-based expert system developed for design of composite floor systems in multistory buildings is discussed. The design system is in accordance with the 1986 American Institute of Steel Construction (AISC) load and resistance factor design (LRFD) specification. Design options include design for practical minimum cost or for minimum depth. The artificial intelligence (AI) technology complements the traditional numerical processing in automating the complex problem of integrated engineering design and developing intelligent software packages that can interact with the user at a high level.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132611984","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161077
F. Merat, G. Radack, K. Roumina, S. Ruegsegger
A methodology for automated inspection planning of machined parts within feature-based CIM in which part geometry and tolerances are represented as features is described. This representation of information as features is extended to inspection process planning where inspection plan fragments are inspection features containing specific information about how toleranced geometry is to be inspected. A rule base of methods and detailed procedures for evaluating tolerances based on industrial practices are used to generate the inspection plan fragments. A single tolerance can often be inspected in several ways, resulting in the generation of many inspection plan fragments. Inspection planing for computer-controlled coordinate measuring machines is emphasized. The inspection plan fragments for each tolerance in the design are combined into an overall time-efficient inspection plan. An algorithm for inspection process planning is described and applied to a sample part.<>
{"title":"Automated inspection planning within the Rapid Design System","authors":"F. Merat, G. Radack, K. Roumina, S. Ruegsegger","doi":"10.1109/ICSYSE.1991.161077","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161077","url":null,"abstract":"A methodology for automated inspection planning of machined parts within feature-based CIM in which part geometry and tolerances are represented as features is described. This representation of information as features is extended to inspection process planning where inspection plan fragments are inspection features containing specific information about how toleranced geometry is to be inspected. A rule base of methods and detailed procedures for evaluating tolerances based on industrial practices are used to generate the inspection plan fragments. A single tolerance can often be inspected in several ways, resulting in the generation of many inspection plan fragments. Inspection planing for computer-controlled coordinate measuring machines is emphasized. The inspection plan fragments for each tolerance in the design are combined into an overall time-efficient inspection plan. An algorithm for inspection process planning is described and applied to a sample part.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129122450","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161148
J. Wang, J. Jean
A set of neural networks is used in a two-stage character recognition system to resolve the confusion among similar characters. A snowball training algorithm is proposed to remedy the convergence problem encountered by backpropagation training. The algorithm is shown to be effective in reducing the number of hidden units and the training time. To further improve the network's generalization capability, a smoothing operation is incorporated into the snowball training. Experimental results confirm the effectiveness of the approach.<>
{"title":"Automatic rule generation for machine printed character recognition using multiple neural networks","authors":"J. Wang, J. Jean","doi":"10.1109/ICSYSE.1991.161148","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161148","url":null,"abstract":"A set of neural networks is used in a two-stage character recognition system to resolve the confusion among similar characters. A snowball training algorithm is proposed to remedy the convergence problem encountered by backpropagation training. The algorithm is shown to be effective in reducing the number of hidden units and the training time. To further improve the network's generalization capability, a smoothing operation is incorporated into the snowball training. Experimental results confirm the effectiveness of the approach.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"283 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114379914","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161062
A. Sarantopoulos, T. Hartley
A modeling approach for linear isentropic flow systems based on the quasi-one-dimensional Euler equations of nonviscous, compressible flow is presented. Such systems are representative of certain high-speed propulsion systems. Accurate models useful in control system studies are developed. A supersonic inlet is considered, and the resulting set of partial differential equations with boundary conditions is solved for a linear transfer matrix using Laplace transforms.<>
{"title":"Modeling of linear isentropic flow systems","authors":"A. Sarantopoulos, T. Hartley","doi":"10.1109/ICSYSE.1991.161062","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161062","url":null,"abstract":"A modeling approach for linear isentropic flow systems based on the quasi-one-dimensional Euler equations of nonviscous, compressible flow is presented. Such systems are representative of certain high-speed propulsion systems. Accurate models useful in control system studies are developed. A supersonic inlet is considered, and the resulting set of partial differential equations with boundary conditions is solved for a linear transfer matrix using Laplace transforms.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114429481","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161083
M. Bodson, J. Chiasson
Three approaches for nonlinear control are compared; feedback linearization, generalized controller canonical forms, and input/output linearization. To establish a framework for comparison, the example of a shunt DC motor is studied. It was found that the conditions for applying the method of feedback linearization were not satisfied; the full 3D state-space system could not be linearized by state transformation. It was found that, after eliminating a state and therefore reducing the dimension from three to two, the system became feedback linearizable. In other words, the dynamics associated with the remaining two states could be linearized by change of coordinates and state feedback. A similar situation occurred with the input/output linearization, except that the dynamics that were linearized were those associated with the rotor position and velocity, while the remaining dynamics (associated with the field current) were made unobservable.<>
{"title":"Nonlinear and adaptive control of a shunt DC motor","authors":"M. Bodson, J. Chiasson","doi":"10.1109/ICSYSE.1991.161083","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161083","url":null,"abstract":"Three approaches for nonlinear control are compared; feedback linearization, generalized controller canonical forms, and input/output linearization. To establish a framework for comparison, the example of a shunt DC motor is studied. It was found that the conditions for applying the method of feedback linearization were not satisfied; the full 3D state-space system could not be linearized by state transformation. It was found that, after eliminating a state and therefore reducing the dimension from three to two, the system became feedback linearizable. In other words, the dynamics associated with the remaining two states could be linearized by change of coordinates and state feedback. A similar situation occurred with the input/output linearization, except that the dynamics that were linearized were those associated with the rotor position and velocity, while the remaining dynamics (associated with the field current) were made unobservable.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115761103","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161122
L. Fortuna, S. Graziani, S. Baglio, G. Nunnari
A parallel strategy to automatically design a fuzzy controller, i.e. to obtain the rules that form the system controller, is discussed. The strategy is proposed in accordance with the natural parallelism of the cell-to-cell mapping approach, and some improvements are suggested. To make the computation algorithm faster and allow the controller design, even if complex nonlinear systems are considered, a natural modeling approach is suggested. The procedure has been implemented on a multiprocessor architecture based on transputers. It has been applied to design several fuzzy controllers: the results using the fuzzy controller of a nonlinear system confirm the suitability of the approach in comparison with classical regulators.<>
{"title":"Improvements in fuzzy controller design","authors":"L. Fortuna, S. Graziani, S. Baglio, G. Nunnari","doi":"10.1109/ICSYSE.1991.161122","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161122","url":null,"abstract":"A parallel strategy to automatically design a fuzzy controller, i.e. to obtain the rules that form the system controller, is discussed. The strategy is proposed in accordance with the natural parallelism of the cell-to-cell mapping approach, and some improvements are suggested. To make the computation algorithm faster and allow the controller design, even if complex nonlinear systems are considered, a natural modeling approach is suggested. The procedure has been implemented on a multiprocessor architecture based on transputers. It has been applied to design several fuzzy controllers: the results using the fuzzy controller of a nonlinear system confirm the suitability of the approach in comparison with classical regulators.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116382795","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161154
R. Paroda, A. Kumar
An approach to design an optimal reduced-order estimator (ROE) directly from a full-order system is proposed. The cost functional used is quadratic with positive definite weighting. The approach is based on the minimization of the associated Hamiltonian to obtain optimal ROE parameters. Examination of the Hessian matrix reveals extra conditions for ROE parameters to be optimal.<>
{"title":"Optimal reduced-order estimator design for discrete, time-varying systems","authors":"R. Paroda, A. Kumar","doi":"10.1109/ICSYSE.1991.161154","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161154","url":null,"abstract":"An approach to design an optimal reduced-order estimator (ROE) directly from a full-order system is proposed. The cost functional used is quadratic with positive definite weighting. The approach is based on the minimization of the associated Hamiltonian to obtain optimal ROE parameters. Examination of the Hessian matrix reveals extra conditions for ROE parameters to be optimal.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116454079","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161095
K. Tomiyama, F. Honda, H. Shinoda, J. Tanaka
An integrated testbed for the study of a smart robot control system based on a UNIX workstation is discussed. It has a VME-bus-based real-time controller which provides data acquisition capability to the system. The SCARA-type manipulator is powered by a set of pulse-controlled servo drivers. Image data are gathered and processed by the combination of image processing hardware and a CCD camera. A UNIX workstation is designated to provide intelligence to the system by understanding the environment of the robot through image data. It also provides online data analysis capability. The system was checked by an object following experiment where the robot chases a pair of alternatively lit LEDs. Data acquisition and analysis capability was built into the system. A mathematical model of the manipulator was obtained. The model was used in designing a digital compensator. The compensator was implemented in the form of a software servo and successfully suppressed oscillatory response of the manipulator.<>
{"title":"A robot control system based on a UNIX work-station","authors":"K. Tomiyama, F. Honda, H. Shinoda, J. Tanaka","doi":"10.1109/ICSYSE.1991.161095","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161095","url":null,"abstract":"An integrated testbed for the study of a smart robot control system based on a UNIX workstation is discussed. It has a VME-bus-based real-time controller which provides data acquisition capability to the system. The SCARA-type manipulator is powered by a set of pulse-controlled servo drivers. Image data are gathered and processed by the combination of image processing hardware and a CCD camera. A UNIX workstation is designated to provide intelligence to the system by understanding the environment of the robot through image data. It also provides online data analysis capability. The system was checked by an object following experiment where the robot chases a pair of alternatively lit LEDs. Data acquisition and analysis capability was built into the system. A mathematical model of the manipulator was obtained. The model was used in designing a digital compensator. The compensator was implemented in the form of a software servo and successfully suppressed oscillatory response of the manipulator.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128154304","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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