{"title":"Torsional vibration suppression control in 2-mass system by state feedback speed controller","authors":"Seung-Ho Song, Jun-Keun Ji, S. Sul, Min-Ho Park","doi":"10.1109/CCA.1993.348293","DOIUrl":"https://doi.org/10.1109/CCA.1993.348293","url":null,"abstract":"In this paper, observer-based state feedback speed controller for torsional vibration suppression of a 2-mass system is proposed. Because of the difficulty of measuring the load speed and the shaft torque in real plant, the reduced observer is used to estimate not only the unknown states but also the load torque disturbance. Simulations and experiments carried out to verify this algorithm in comparison with conventional PI controller. This controller shows better command following characteristic without torsional vibration. The speed response to the rapid load torque change is also examined to show the disturbance rejection characteristic which is specially important in industrial applications such as rolling mill drives. At the moment of impact load, the speed drop is reduced and the recovery time is shortened remarkably.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"318 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115437737","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":"Automatic control of blood oxygen saturation in premature infants","authors":"Edmund Morozoff, R. W. Evans, J. Smyth","doi":"10.1109/CCA.1993.348256","DOIUrl":"https://doi.org/10.1109/CCA.1993.348256","url":null,"abstract":"This paper describes research into the development of a controller that regulates blood oxygen saturation (SaO/sub 2/) in premature infants. The patient's SaO/sub 2/ is measured by a pulse oximeter and fed into the controller which adjusts the neonate's inspired air-oxygen (FiO/sub 2/) mixture by actuating a motorized gas blender. This oxygen therapy is used to prevent incidents of hypoxemia and hyperoxemia. A simplified physiological model is described. The designers use a unique control algorithm based on the sign of the error magnitude, velocity and acceleration as inputs. The algorithm applies these inputs to a state machine that determines the trend of the error. This trend defines the next state and an associated FiO/sub 2/ adjustment and time delay. The controller was verified on eight neonates, each over a six hour study period. During automatic oxygen therapy the controller significantly increased the duration of time the patient spent at normal SaO/sub 2/ levels as compared to manual therapy. The numbers of manual interventions were also greatly reduced when the neonates were under automatic oxygen therapy.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129899056","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":"Robust almost time-optimal fuzzy control of a two-tank system","authors":"T. Heckenthaler, S. Engell","doi":"10.1109/CCA.1993.348282","DOIUrl":"https://doi.org/10.1109/CCA.1993.348282","url":null,"abstract":"The paper deals with the level controls in a laboratory two-tank system. The plant is strongly nonlinear due to the basic dynamic equations and the characteristics of the valves. We developed a nonlinear control law which achieves robust almost time-optimal control over the full range of operation conditions. The development is based on ideas from fuzzy control, but in contrast to usual fuzzy controller designs, most of the rules are not derived from heuristics but rather are mathematical formulae which, together with the standard fuzzy quantization of the system's variables, approximate the time-optimal control law. This approximation is improved by heuristic rules which were gained from the observation of the behaviour of the controlled plant. The resulting nonlinear control law exhibits a performance which is not attainable with standard linear control nor with classical time-optimal control.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129476134","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":"Coordinated profile control of base sheet and coated product properties","authors":"H. Mustonen, R. Ritala","doi":"10.1109/CCA.1993.348264","DOIUrl":"https://doi.org/10.1109/CCA.1993.348264","url":null,"abstract":"The quality of coated paper is strongly affected by the base sheet. Normally, cross direction (CD) controls of the paper machine minimize dry weight, moisture and caliper variations of the base sheet. This strategy does not, however, guarantee optimal CD properties of the final coated product. To optimize the properties of coated paper, the demands of the coating process should be taken into account when planning the controls for the base sheet. The variations in the base paper and final product properties cannot be minimized at the same time. Therefore it is necessary to have a coordinated control that takes into account the effects of the base paper properties on the coated product. The coordination is based on finding a trade-off between the different control criteria. This can be realized by a higher level supervisory system that computes set profiles for the individual control stations according to priorities given by the operator, The potential benefits of coordinated control were examined by simulation. A mill trial was completed to identify the response models needed in simulation. The results show clearly that considerable improvement can be achieved by utilizing coordinated control.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129495165","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":"Validation of reduced-order models for closed loop applications","authors":"L. A. Aguirre","doi":"10.1109/CCA.1993.348337","DOIUrl":"https://doi.org/10.1109/CCA.1993.348337","url":null,"abstract":"This work is concerned with the validation of reduced-order models which are intended for closed-loop applications. The main objective is to point out some issues arising in the use of such models in closed-loop applications. It is shown that in validating simplified models, special attention should be given to the accuracy of the approximation at crossover frequencies. This observation naturally leads to the conclusion that, in some cases, open-loop model reduction techniques can be successfully used in deriving models intended for closed-loop applications thus avoiding optimal methods which are far more time-consuming. A second objective is to show how a reduced-order model could have varying degrees of accuracy in closed-loop when controller parameters are varied. Numerical examples which use the model of an actual fuel control system are included to illustrate the main points of the paper.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128076842","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":"Knowledge discovery and constraint-based processing in automated manufacturing","authors":"Jiawei Han, Yongjian Fu","doi":"10.1109/CCA.1993.348323","DOIUrl":"https://doi.org/10.1109/CCA.1993.348323","url":null,"abstract":"This paper studies the application of integrated database and artificial intelligence technologies in automated manufacturing. Two interesting techniques: (1) knowledge discovery, i.e., discovery of interesting rules and regularities from data or processing history, and (2) constraint-based processing, i.e., the application of the knowledge and rules as constraints in the guidance or control of a manufacturing process, are examined in detail. The study shows that the proposed technique may extract interesting knowledge from data, guide manufacturing processes and enhance system performance. Therefore, it may have important implications to computer-integrated manufacturing systems.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121955921","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":"Adaptive control of a class of nonlinear systems","authors":"F. Ding, X. Xie","doi":"10.1109/CCA.1993.348230","DOIUrl":"https://doi.org/10.1109/CCA.1993.348230","url":null,"abstract":"In this paper, the inverse method of nonlinear systems with a nonlinearity is presented, and adaptive control algorithm of this type of nonlinear systems is established. This control algorithm is also suitable for the unstable and (or) inverse unstable systems, achieves virtually asymptotically optimal control and may ensure the closed-loop systems to be globally convergent and stable by choosing weighted polynomials. The simulation results show that the algorithm can overcome the affection of nonlinearity of the systems and may improve control performance.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126497315","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":"Robust MIMO generalized predictive control with multiple reference model: a helicopter application","authors":"P. Codron, P. Boucher","doi":"10.1109/CCA.1993.348241","DOIUrl":"https://doi.org/10.1109/CCA.1993.348241","url":null,"abstract":"This paper is concerned with multivariable generalized predictive control with multiple reference model in its polynomial form (MIMO GPC/MRM). The results presented by Robinson and Clarke (1991) are extended to the MlMO GPC/MRM method and it is shown how to apply them. Then the method is applied to a helicopter; simulation results are given which show the decoupling efficiency and the robustness of the controller by a test on a weakly mismatched system and the improvement of the robustness brought by the T matrix filter on a strongly mismatched system.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126462426","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":"Simulation evaluation of a pilot interface with an automated rotorcraft obstacle avoidance system","authors":"R. Coppenbarger, V. Cheng","doi":"10.1109/CCA.1993.348330","DOIUrl":"https://doi.org/10.1109/CCA.1993.348330","url":null,"abstract":"Pilot interface with an automated nap-of-the-earth (NOE) rotorcraft guidance and control system was investigated in the NASA Ames Research Center's fixed-base Interchangeable Cab (ICAB) simulator facility. The interface concept, referred to as pilot-directed guidance (PDG), involves interpreting pilot inputs as high-level commands to an inner-loop automatic guidance and control system. With this interface, a pilot can concentrate upon primary course guidance and secondary cockpit tasks by delegating obstacle detection and avoidance tasks to an automatic system. An advantage of the PDG concept is that it allows far continuous pilot interaction which has been shown to be important for pilot acceptability. The paper first describes the inner loop Automated Nap-of-the-Earth Guidance and Control System (ANGCS) and the associated PDG interface, followed by the findings from the fixed-base simulation. The simulation was designed to assess pilot-in-the-loop performance of the PDG-ANGCS technology and determine its effectiveness at reducing pilot workload. Head-up symbology, including inertial course information and critical aircraft states, was presented to the pilot through the Integrated Helmet and Display Sighting System (IHADSS) with head tracking. A typical NOE obstacle course was flown both manually and with the PDG system at various airspeeds and visibility conditions for a comparative performance and workload study.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127697726","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":"Multi-rate estimation and monitoring of process variables in a bioreactor","authors":"R. Gudi, I.R. Gray, S. Shah","doi":"10.1109/CCA.1993.348243","DOIUrl":"https://doi.org/10.1109/CCA.1993.348243","url":null,"abstract":"This paper addresses the problem of simultaneous state and parameter estimation for a bioprocess. It proposes a formal approach to incorporate multiple rates of sampling, that typically exist in a bioprocess, so that estimation is done using all of and the most up to-date measurements. The software sensor that results from the above approach is validated using experimental data from fed-batch fermentation of Streptomyces Clavuligerus.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121057566","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}