Pub Date : 1988-06-15DOI: 10.23919/ACC.1988.4789879
I. Apostolakis, J. Diamessis, D. Jordan
The method introduced utilizes a quasi-similarity transformation, based on the projection of the state vector, to obtain the denominator of the reduced order transfer function. The remaining parameters are obtained by matching a number of Markov parameters and time-moments.
{"title":"A New Method for Discrete-Time System Reduction","authors":"I. Apostolakis, J. Diamessis, D. Jordan","doi":"10.23919/ACC.1988.4789879","DOIUrl":"https://doi.org/10.23919/ACC.1988.4789879","url":null,"abstract":"The method introduced utilizes a quasi-similarity transformation, based on the projection of the state vector, to obtain the denominator of the reduced order transfer function. The remaining parameters are obtained by matching a number of Markov parameters and time-moments.","PeriodicalId":6395,"journal":{"name":"1988 American Control Conference","volume":"34 1","pages":"1068-1070"},"PeriodicalIF":0.0,"publicationDate":"1988-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81797232","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 : 1988-06-15DOI: 10.1109/ACC.1988.4173156
K. Narendra, M. Duarte
A new approach, combining direct and indirect control methods, recently proposed by the authors [1,2] is used to adaptively control plants with unknown parameters. The plant parameters are known to lie in a specified compact set in parameter space and the output of the plant has to follow a desired output in the presence of a piecewise constant input disturbance. Simulation results indicate that the combined method performs better than either the direct or the indirect methods.
{"title":"Robust Adaptive Control Using Combined Direct and Indirect Methods","authors":"K. Narendra, M. Duarte","doi":"10.1109/ACC.1988.4173156","DOIUrl":"https://doi.org/10.1109/ACC.1988.4173156","url":null,"abstract":"A new approach, combining direct and indirect control methods, recently proposed by the authors [1,2] is used to adaptively control plants with unknown parameters. The plant parameters are known to lie in a specified compact set in parameter space and the output of the plant has to follow a desired output in the presence of a piecewise constant input disturbance. Simulation results indicate that the combined method performs better than either the direct or the indirect methods.","PeriodicalId":6395,"journal":{"name":"1988 American Control Conference","volume":"13 1","pages":"2429-2434"},"PeriodicalIF":0.0,"publicationDate":"1988-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84263739","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 : 1988-06-15DOI: 10.23919/ACC.1988.4790023
M. Overstreet, R. Hoskin
Fiber optic sensors are uniquely suited to reliable operation in the very high temperature, radiation, and electromagnetic interference (EMI) environments experienced by turbine engine controls. Discussed are the fundamental physical characteristics of fiber optic sensor technology, including EMI immunity, lightweight and small size, high temperature and radiation tolerance, flexibility, stability and durability. Principles of operation for fiber optic sensors and systems are discussed, including basic design principles, extrinsic vs. intrinsic sensing, and typical fiber optic links. A discussion of the state of the art and application provides the status of development and outlook for various fiber optic sensor types (pressure, temperature, etc.) for the defined applications. The paper finishes with conclusions, highlighted payoffs and a technology roadmap.
{"title":"Fiber Optics for Aircraft Engine Controls","authors":"M. Overstreet, R. Hoskin","doi":"10.23919/ACC.1988.4790023","DOIUrl":"https://doi.org/10.23919/ACC.1988.4790023","url":null,"abstract":"Fiber optic sensors are uniquely suited to reliable operation in the very high temperature, radiation, and electromagnetic interference (EMI) environments experienced by turbine engine controls. Discussed are the fundamental physical characteristics of fiber optic sensor technology, including EMI immunity, lightweight and small size, high temperature and radiation tolerance, flexibility, stability and durability. Principles of operation for fiber optic sensors and systems are discussed, including basic design principles, extrinsic vs. intrinsic sensing, and typical fiber optic links. A discussion of the state of the art and application provides the status of development and outlook for various fiber optic sensor types (pressure, temperature, etc.) for the defined applications. The paper finishes with conclusions, highlighted payoffs and a technology roadmap.","PeriodicalId":6395,"journal":{"name":"1988 American Control Conference","volume":"57 1","pages":"1819-1824"},"PeriodicalIF":0.0,"publicationDate":"1988-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84518056","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 : 1988-06-15DOI: 10.23919/ACC.1988.4789883
P. Garrett
An increasing national priority on quality in product design and manufacturing requires significant advancement and new understanding to provide a supporting theoretical foundation and definitive science base. The effort to achieve needed productivity and performance advancement in contemporary computer integrated manufacturing embraces a continuum of disciplines that provides new levels of process performance. This includes a comprehensive definition of CADAM error accountability, feature design information at the process interface, apriori system linkages with aposteriori statistical process control, and integration of the advanced concepts of qualitative process theory with sensor fusion for complementing online domain knowledge. With online tracking of parameter variations a digital controller can then be adapted to maintain system error within a predetermined bound.
{"title":"Error Understanding in Computer Integrated Manufacturing Processes","authors":"P. Garrett","doi":"10.23919/ACC.1988.4789883","DOIUrl":"https://doi.org/10.23919/ACC.1988.4789883","url":null,"abstract":"An increasing national priority on quality in product design and manufacturing requires significant advancement and new understanding to provide a supporting theoretical foundation and definitive science base. The effort to achieve needed productivity and performance advancement in contemporary computer integrated manufacturing embraces a continuum of disciplines that provides new levels of process performance. This includes a comprehensive definition of CADAM error accountability, feature design information at the process interface, apriori system linkages with aposteriori statistical process control, and integration of the advanced concepts of qualitative process theory with sensor fusion for complementing online domain knowledge. With online tracking of parameter variations a digital controller can then be adapted to maintain system error within a predetermined bound.","PeriodicalId":6395,"journal":{"name":"1988 American Control Conference","volume":"36 1","pages":"1089-1093"},"PeriodicalIF":0.0,"publicationDate":"1988-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84885410","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 : 1988-06-15DOI: 10.23919/ACC.1988.4790110
Y. You, E. Lee
Dynamical control from the boundary of a vibrating membrane with edge mass and of general shape is mathematically formulated as an abstract evolutionary-system. The approximate controllability and the strong stabilization via linear boundary damping feedback are established by an approach based on LaSalle's invariance principle and global Holmgren uniqueness theorem.
{"title":"Dynamical Boundary Control of Two-Dimensional Wave Equations: Vibrating Membrane on General Domain","authors":"Y. You, E. Lee","doi":"10.23919/ACC.1988.4790110","DOIUrl":"https://doi.org/10.23919/ACC.1988.4790110","url":null,"abstract":"Dynamical control from the boundary of a vibrating membrane with edge mass and of general shape is mathematically formulated as an abstract evolutionary-system. The approximate controllability and the strong stabilization via linear boundary damping feedback are established by an approach based on LaSalle's invariance principle and global Holmgren uniqueness theorem.","PeriodicalId":6395,"journal":{"name":"1988 American Control Conference","volume":"44 1","pages":"2312-2317"},"PeriodicalIF":0.0,"publicationDate":"1988-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84934268","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 : 1988-06-15DOI: 10.1109/ACC.1988.4172731
S. Katzir, E. Cliff, H. Kelley
Midcourse guidance is examined for an air-to-air missile featuring boost-sustain propulsion. A vertical plane, point-mass model is studied with load factor as a control variable. Time-range-energy optimal trajectories are computed, open-loop, via the usual necessary conditions and a multiple-shooting algorithm. A requirement on terminal velocity magnitude is examined for its effect on firing range.
{"title":"Best-Range Study for a Boost-Sustain Missile","authors":"S. Katzir, E. Cliff, H. Kelley","doi":"10.1109/ACC.1988.4172731","DOIUrl":"https://doi.org/10.1109/ACC.1988.4172731","url":null,"abstract":"Midcourse guidance is examined for an air-to-air missile featuring boost-sustain propulsion. A vertical plane, point-mass model is studied with load factor as a control variable. Time-range-energy optimal trajectories are computed, open-loop, via the usual necessary conditions and a multiple-shooting algorithm. A requirement on terminal velocity magnitude is examined for its effect on firing range.","PeriodicalId":6395,"journal":{"name":"1988 American Control Conference","volume":"52 1","pages":"155-159"},"PeriodicalIF":0.0,"publicationDate":"1988-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85753256","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 : 1988-06-15DOI: 10.1109/ACC.1988.4172892
J. Juang
Progress at the NASA Langley Research Center in the area of rapid multi-flexible-body maneuvering experiments is described in this paper. The experiments are designed to verify theoretical analyses using control theory for the control of flexible structures. The objective of the maneuvering experiments is to demonstrate slewing of flexible structures in multiple axes while simultaneously suppressing vibration to have acceptable motion at the end of the maneuver. The status of some research activities oriented primarily to the experimental methods for control of flexible structures is presented.
{"title":"Rapid Multi-Flexible-Body Maneuvering Experiments","authors":"J. Juang","doi":"10.1109/ACC.1988.4172892","DOIUrl":"https://doi.org/10.1109/ACC.1988.4172892","url":null,"abstract":"Progress at the NASA Langley Research Center in the area of rapid multi-flexible-body maneuvering experiments is described in this paper. The experiments are designed to verify theoretical analyses using control theory for the control of flexible structures. The objective of the maneuvering experiments is to demonstrate slewing of flexible structures in multiple axes while simultaneously suppressing vibration to have acceptable motion at the end of the maneuver. The status of some research activities oriented primarily to the experimental methods for control of flexible structures is presented.","PeriodicalId":6395,"journal":{"name":"1988 American Control Conference","volume":"195 1","pages":"1009-1016"},"PeriodicalIF":0.0,"publicationDate":"1988-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76820006","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 : 1988-06-15DOI: 10.23919/ACC.1988.4790116
A. Sinha
In this paper we investigate stability properties in solutions of impulsively perturbed systems with respect to the delay differential equations. Many physical systems such as biological neural nets and pulse frequency modulated systems exhibit such impulsive behaviour.
{"title":"Comparison Methods for Impulsely Perturbed Delay-Differential Control Systems","authors":"A. Sinha","doi":"10.23919/ACC.1988.4790116","DOIUrl":"https://doi.org/10.23919/ACC.1988.4790116","url":null,"abstract":"In this paper we investigate stability properties in solutions of impulsively perturbed systems with respect to the delay differential equations. Many physical systems such as biological neural nets and pulse frequency modulated systems exhibit such impulsive behaviour.","PeriodicalId":6395,"journal":{"name":"1988 American Control Conference","volume":"68 1","pages":"2335-2336"},"PeriodicalIF":0.0,"publicationDate":"1988-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77109627","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 : 1988-06-15DOI: 10.23919/ACC.1988.4790014
J. Wen, K. Kreutz, D. Bayard
A new class of joint level control laws for all-revolute robot arms is introduced in this paper. The analysis is similar to the recently proposed energy Lyapunov function approach [1, 2], except that the closed loop potential function is shaped in accordance with the underlying joint space topology. By using energy Lyapunov functions with the modified potential energy, a much simpler analysis can be employed to show closed loop global asymptotic stability and local exponential stability. When Coulomb and viscous friction, and model parameter errors are present, a sliding-mode-like modification of the control law is proposed to add a robustness enhancing outer loop. Adaptive control is also addressed within the same framework. A linear-in-the-parameters formulation is adopted and globally asymptotically stable adaptive control laws are derived by replacing the model parameters in the non-adaptive control laws by their estimates.
{"title":"A New Class of Energy Based Control Laws for Revolute Robot Arms: Tracking Control, Robustness Enhancement and Adaptive Control","authors":"J. Wen, K. Kreutz, D. Bayard","doi":"10.23919/ACC.1988.4790014","DOIUrl":"https://doi.org/10.23919/ACC.1988.4790014","url":null,"abstract":"A new class of joint level control laws for all-revolute robot arms is introduced in this paper. The analysis is similar to the recently proposed energy Lyapunov function approach [1, 2], except that the closed loop potential function is shaped in accordance with the underlying joint space topology. By using energy Lyapunov functions with the modified potential energy, a much simpler analysis can be employed to show closed loop global asymptotic stability and local exponential stability. When Coulomb and viscous friction, and model parameter errors are present, a sliding-mode-like modification of the control law is proposed to add a robustness enhancing outer loop. Adaptive control is also addressed within the same framework. A linear-in-the-parameters formulation is adopted and globally asymptotically stable adaptive control laws are derived by replacing the model parameters in the non-adaptive control laws by their estimates.","PeriodicalId":6395,"journal":{"name":"1988 American Control Conference","volume":"53 1","pages":"1776-1781"},"PeriodicalIF":0.0,"publicationDate":"1988-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77144303","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 : 1988-06-15DOI: 10.23919/ACC.1988.4789948
R. D. Irwin
Filter Accommodated Model Error Sensitivity Suppression (FAMESS) is applied to the problem of regulating the line-of-sight (LOS) of a laser beam pointing system mounted on a 13 meter flexible beam, which is the current configuration of the Marshall Space Flight Center Large Space Structure Ground Test Verification Facility (LSS/GTV). The configuration of the LSS/GTV exhibits many of the pathologies usually associated with large space structures (LSS): (1) low damping, (2) closely spaced modal frequencies, and (3) very low frequency bending modes. Moreover, the sensor/actuator complement of the configuration is not such that colocation of sensors and actuators can be presumed. The collection of techniques commonly known as FAMESS is used to accomplish the design of the LOS regulating control system for the LSS/GTV. These techniques include decentralization, alpha shifting techniques, model error sensitivity suppression, and filter accommodation. Several problems were encountered during the design of the controller for the facility. These problems include computational hardware limitations, proof-mass actuator limitations, controller model sensitivity, constraint placed on the control signals in the sensitivity suppression technique, and problems with modal separation for closely spaced modes. Representative test results are presented and illustrate the dramatic degradation of performance which can be expected when significant system behavior is unmodeled.
{"title":"Application of FAMESS to a Large Space Structure Ground Test Facility","authors":"R. D. Irwin","doi":"10.23919/ACC.1988.4789948","DOIUrl":"https://doi.org/10.23919/ACC.1988.4789948","url":null,"abstract":"Filter Accommodated Model Error Sensitivity Suppression (FAMESS) is applied to the problem of regulating the line-of-sight (LOS) of a laser beam pointing system mounted on a 13 meter flexible beam, which is the current configuration of the Marshall Space Flight Center Large Space Structure Ground Test Verification Facility (LSS/GTV). The configuration of the LSS/GTV exhibits many of the pathologies usually associated with large space structures (LSS): (1) low damping, (2) closely spaced modal frequencies, and (3) very low frequency bending modes. Moreover, the sensor/actuator complement of the configuration is not such that colocation of sensors and actuators can be presumed. The collection of techniques commonly known as FAMESS is used to accomplish the design of the LOS regulating control system for the LSS/GTV. These techniques include decentralization, alpha shifting techniques, model error sensitivity suppression, and filter accommodation. Several problems were encountered during the design of the controller for the facility. These problems include computational hardware limitations, proof-mass actuator limitations, controller model sensitivity, constraint placed on the control signals in the sensitivity suppression technique, and problems with modal separation for closely spaced modes. Representative test results are presented and illustrate the dramatic degradation of performance which can be expected when significant system behavior is unmodeled.","PeriodicalId":6395,"journal":{"name":"1988 American Control Conference","volume":"7 1","pages":"1456-1461"},"PeriodicalIF":0.0,"publicationDate":"1988-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73627678","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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