{"title":"Positively invariant set of RFDE with applications to linear systems with time-varying input delays","authors":"Chunhai Hou, Jixin Qian","doi":"10.1109/ACC.1998.703336","DOIUrl":"https://doi.org/10.1109/ACC.1998.703336","url":null,"abstract":"Positively invariant set of retarded functional differential equations (RFDEs) with perturbations is investigated. As the application of results obtained for RFDEs, the state positively asymmetrical invariant set for linear systems with nonlinear time-varying input delay is first introduced, and sufficient conditions of the state positively asymmetrical invariant set for such systems are presented.","PeriodicalId":364267,"journal":{"name":"Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207)","volume":"31 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133761190","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}
{"title":"Friction compensation in the presence of flexibility","authors":"G. Tao","doi":"10.1109/ACC.1998.703003","DOIUrl":"https://doi.org/10.1109/ACC.1998.703003","url":null,"abstract":"An adaptive state feedback control scheme is developed for noncanonical form systems with unknown parameters, by employing static state feedback for pole placement and dynamic output feedback for parameter adaptation. The developed control scheme does not need a restrictive state space model matching condition for an adaptive state feedback design. An extended model reference adaptive control scheme is then developed for control of the two-body system with nonlinear friction components in the presence of flexibility.","PeriodicalId":364267,"journal":{"name":"Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115785753","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}
{"title":"Control of fluid mixing using entropy methods","authors":"D. D’Alessandro, M. Dahleh, I. Mezić","doi":"10.1109/ACC.1998.703526","DOIUrl":"https://doi.org/10.1109/ACC.1998.703526","url":null,"abstract":"We consider the problem of motion planning for fluid mixing. The control problem consists of determining the flow that will mix best among the ones achieved by composing purely horizontal and vertical shears on a two dimensional torus. This is a prototypical problem for many practical fluid flow applications, and describes the basic stretching and folding mechanisms involved in mechanical mixing. Our approach is to study the mixing process using the ergodic theoretic concepts of strong mixing and entropy. In a more general context, we develop the necessary tools for an ergodic theory of sequences of transformations. A number of generalizations of previous results obtained by the authors are presented. In particular, the maximum entropy optimization problem is posed and solved here not only on the sequence of the shear flows to be applied but also on the shape of the functions involved. The solution of the problem turns out to have a direct physical interpretation linking some facts in ergodic theory and fluid dynamics. Other general results, such as the characterization of mixing properties for sequences under a suitable convergence assumption, are also applied to our physical problem.","PeriodicalId":364267,"journal":{"name":"Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124328247","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}
{"title":"Modeling, simulation, animation, and real-time (MoSART) control of helicopter systems","authors":"Chen-I Lim, A.A. Rodriguez","doi":"10.1109/ACC.1998.703589","DOIUrl":"https://doi.org/10.1109/ACC.1998.703589","url":null,"abstract":"This paper describes a Microsoft Windows 95/NT, Visual C++, Direct-3D based software environment for simulating and visualizing high-performance helicopter systems. Different simulation and animation models may be selected by the users. The users are also able to alter the model and controller parameters on the \"fly\", thus allowing them to quickly examine different scenarios. Both two dimensional bitmaps and three-dimensional polygon representations are used for animation. Real-time plotting and graphical indicators are also employed to help users abstract out key phenomena. The environment also accommodates data exchange with MATLAB. Simulation data generated from within MATLAB may be visualized and animated with the helicopter environment. Conversely, users may readily export simulation data to MATLAB and use the associated toolboxes for post-processing and further analysis. The MoSART helicopter environment is a valuable tool for enhancing both education and research.","PeriodicalId":364267,"journal":{"name":"Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207)","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114353451","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}
{"title":"Inverting recurrent neural networks for internal model control of nonlinear systems","authors":"C. Kambhampati, R. Craddock, M. Tham, K. Warwick","doi":"10.1109/ACC.1998.703554","DOIUrl":"https://doi.org/10.1109/ACC.1998.703554","url":null,"abstract":"In this paper, we show how a set of recently derived theoretical results for recurrent neural networks can be applied to the production of an internal model control system for a nonlinear plant. The results include determination of the relative order of a recurrent neural network and invertibility of such a network. A closed loop controller is produced without the need to retrain the neural network plant model. Stability of the closed-loop controller is also demonstrated.","PeriodicalId":364267,"journal":{"name":"Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207)","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114758797","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}
{"title":"A simple linear stabilizing controller for RLED robot manipulators with uncertain models","authors":"A. Ailon, M. Gil', E.S. Choi, B. Ahn","doi":"10.1109/ACC.1998.703544","DOIUrl":"https://doi.org/10.1109/ACC.1998.703544","url":null,"abstract":"Considers the stability problem of rigid-link electrically driven (RLED) robot manipulators. We present a linear controller which ensures local exponential stability. As far as the mechanical subsystem is concerned, we assume that only bounds on the unknown parameters are available.","PeriodicalId":364267,"journal":{"name":"Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114643675","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}
{"title":"Set-valued nonlinear estimation using the Galerkin approximation","authors":"J. Kenney, R. Beard, W. Stirling","doi":"10.1109/ACC.1998.703279","DOIUrl":"https://doi.org/10.1109/ACC.1998.703279","url":null,"abstract":"A set-valued state estimator for nonlinear dynamic systems is presented. The estimator uses the Galerkin approximation to solve Kolmogorov's equation for the diffusion of a continuous-time, continuous-state nonlinear system, as well as for implementing discrete time updates of noisy measurements. This filtering of the state is accomplished for a convex set of distributions simultaneously, and a functional representation of the set of resulting means is provided at any desired time instance.","PeriodicalId":364267,"journal":{"name":"Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114997250","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}
{"title":"Control technology lessons learned: case study using the micro-precision interferometer testbed","authors":"G. Neat, A. Abramovici","doi":"10.1109/ACC.1998.703534","DOIUrl":"https://doi.org/10.1109/ACC.1998.703534","url":null,"abstract":"This paper presents a partial account of control lessons learned during the development of the micro-precision interferometer testbed. These lessons came about through the design, implementation and test of a specific testbed control system. However, the described lessons are not specific to the application. The topics range from global aspects like how to measure system performance to detailed compensator implementation issues. All of the insights presented would not have been reached without taking this hardware step.","PeriodicalId":364267,"journal":{"name":"Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207)","volume":"174 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116004987","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}
{"title":"Control of uncertain nonholonomic mechanical systems using differential flatness","authors":"E. Barany, K. Glass, R. Colbaugh","doi":"10.1109/ACC.1998.703541","DOIUrl":"https://doi.org/10.1109/ACC.1998.703541","url":null,"abstract":"Considers the problem of controlling uncertain nonholonomic mechanical systems which are differentially flat, that is, which admit a set of (flat) outputs with the property that there is a one to one correspondence between system trajectories and output curves. It is proposed that a simple and effective solution to this problem can be obtained by combining a trajectory generation algorithm for the flat outputs with an adaptive tracking scheme for a set of \"reducing\" outputs; these reducing outputs are a subset of the configuration coordinates and are easily obtained. This approach is shown to ensure accurate motion control despite considerable uncertainty regarding the system dynamic model, and to be generalizable to provide compensation for uncertainty in the kinematic model as well.","PeriodicalId":364267,"journal":{"name":"Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207)","volume":"207 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116157869","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}
{"title":"A globally-stable adaptive field-oriented controller for current-fed induction motors","authors":"T. Ahmed-Ali, F. Lamnabhi-Lagarrigue, R. Ortega","doi":"10.1109/ACC.1998.707078","DOIUrl":"https://doi.org/10.1109/ACC.1998.707078","url":null,"abstract":"We propose a procedure to adjust online the rotor time constant estimate of an indirect field-oriented control law for current-fed induction machines. The resulting scheme is shown to be globally exponentially stable provided the load torque on the motor is zero and the a priori uncertainty on the range of variation of the rotor time constant is smaller than 100%. The latter is a reasonable assumption in many practical cases. We also show that, when the load torque is different from zero, the speed error enters in finite time a residual set whose size is proportional to the load torque.","PeriodicalId":364267,"journal":{"name":"Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207)","volume":"369 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123415555","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}