{"title":"Application of fuzzy logic to control of gas composition in a combustion process","authors":"M.K. Ekbald, T.L. Artim","doi":"10.1109/CCA.1993.348338","DOIUrl":"https://doi.org/10.1109/CCA.1993.348338","url":null,"abstract":"A fuzzy logic-based multi-input/single-output controller has been designed for controlling the gas composition in a combustion process. The combustion process pyrolyzes alumina fiber for utilization in a metal matrix composite. The exothermic reaction, which affects the quality of the alumina fiber, can be indirectly controlled through control of the oxygen concentration. Mass flow controllers which inject and exhaust various gas species to the furnace are used to control the gas composition. The process is controlled thermally through the use of heating elements. Because of the complexity of the combustion process, the use of a fuzzy controller was investigated for control of the gas composition. Steady-state fluid flow models were utilized to define the appropriate membership functions and control rules. The performance of the controller is demonstrated using online process data of the combustion process.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"25 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":"126829610","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":"Chip refiner motor load adaptive control using a nonlinear Laguerre model","authors":"Y. Fu, G. Dumont","doi":"10.1109/CCA.1993.348263","DOIUrl":"https://doi.org/10.1109/CCA.1993.348263","url":null,"abstract":"A Laguerre filter based nonlinear dynamic model and a newly derived predictive control algorithm are used for a wood chip refiner motor load adaptive control in pulp and paper industry. Compared with many existing methods, the new approach has fast convergence in estimation, can provide more accurate prediction and automatically avoids refiner plate collapse when the load setpoint is not reachable. The method can also be easily extended to the modelling and control of a large class of nonlinear dynamic systems.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"61 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":"125152940","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":"Merger of rule based and variable structure controller","authors":"A. Meystel, Y. Nisenzon, R. Nawathe","doi":"10.1109/CCA.1993.348316","DOIUrl":"https://doi.org/10.1109/CCA.1993.348316","url":null,"abstract":"The concept of fuzzy variable structure controller is developed. In this method the error state space around the sliding surface is represented using linguistic variables. A knowledge based controller which decides the contribution of equivalent control and attractability control component in the total control input is designed. The contribution is decided based on how far the current state is from the sliding surface and the origin of the error state space. The performance of the proposed controller is demonstrated for a second order linear time invariant system which has parameter uncertainty. The simulation results show that there is a considerable reduction in chattering and control energy.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"26 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":"132995389","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":"Stirling-cycle cryocooler active vibration control","authors":"A. Wu","doi":"10.1109/CCA.1993.348346","DOIUrl":"https://doi.org/10.1109/CCA.1993.348346","url":null,"abstract":"A cryogenic cooler capable of continuously maintaining the required cryogenic temperature is one of the critical elements enabling space-borne surveillance sensors to detect cold objects against a space background or warm objects against an Earth background. The performance of these sensors, however, can be greatly degraded by the vibration of typical mechanical cryocoolers. \"Balanced\" Stirling-cycle cryocoolers produce significant residual vibration at the harmonics of the fundamental drive frequency due to various nonlinearities which are not compensated by a simple oscillating balance mass. Techniques to sufficiently suppress these vibrations are required for high performance surveillance sensors. This paper examines two very effective control techniques in dealing with the residual vibration force suppression. The first technique uses the narrowband feedback principle to design a force servo compensator which produces a notch filtering effect at each of the harmonic frequencies. The second technique uses the adaptive feedforward principle to inject harmonic signals into one of the cryocooler motor drives to produce a complete force cancellation. The concepts and designs of both control techniques are discussed, and test results of the vibration suppression performance on the Hughes IR&D cooler are presented.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"239 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":"123739413","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":"Active vibration control of a 250 foot span steel truss highway bridge","authors":"S. Shelley, A. Aktan, N. Frederick","doi":"10.1109/CCA.1993.348295","DOIUrl":"https://doi.org/10.1109/CCA.1993.348295","url":null,"abstract":"This paper describes a full scale implementation of an active vibration control system on a 250 foot span steel truss highway bridge. An adaptive modal filter based modal control scheme is utilized in conjunction with a prototype long stroke electromagnetic reaction mass control actuator to achieve up to 20 db attenuation of modal response amplitudes.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"52 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":"124744228","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":"Accelerometer based line-of-sight stabilization approach for pointing and tracking systems","authors":"M. Algrain, J. Quinn","doi":"10.1109/CCA.1993.348288","DOIUrl":"https://doi.org/10.1109/CCA.1993.348288","url":null,"abstract":"Equipment operating from nonstationary platforms are subjected to angular jitter resulting from vehicle linear and angular motions. The purpose of a stabilized platform is to reject the angular disturbances so that the device modulation transfer function (MTF) is preserved at the system level. This paper describes a new platform stabilization approach where miniature, low-cost, linear accelerometers are used (instead of gyroscopes) for line-of-Sight (LOS) stabilization. This is accomplished by placing the accelerometers at strategic locations, and combining their outputs so that angular motion is determined from linear acceleration measurements. The control system uses the sensed angular accelerations to generate movement commands for the gimbal servomotors in the stabilization platform. This counter-rotates the imaging device to stabilize its LOS. The use of accelerometers allows the servo system to operate in an acceleration control mode which is more desirable than position or velocity control modes, typical of gyro-based systems, since this increases stabilization bandwidth. Substituting gyros with accelerometers provides the additional benefits of lower sensor cost, weight and power consumption, better temperature characteristics, more robustness, and higher shock resistance.<<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":"128312682","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 hybrid approach to optimal control","authors":"C. D'souza, J. Cloutier","doi":"10.1109/CCA.1993.348356","DOIUrl":"https://doi.org/10.1109/CCA.1993.348356","url":null,"abstract":"A hybrid approach to optimal control is presented which takes advantage of the best features of the direct and indirect approaches to optimal control. The original infinite-dimensional problem is first converted to a mathematical programming problem via the direct approach of transcription. Utilizing the fact that the necessary conditions of the resulting mathematical programming problem represent a discrete nonlinear two-point boundary-value problem, a solution can be obtained by embedding backward-forward integration sweeps within an iterative algorithm, a characteristic of the indirect approach. The hybrid approach not only allows for the preconditioning of ill-conditioned problems through knowledge of the Hessian, but also reduces the dimension of the search space through the solution of the discrete two-point boundary value problem. The reduction in the dimension of the search space is achieved by having to search only over the discrete control variables rather than both the discrete state and control variables and can lead to significant improvements in algorithm convergence.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"108 4 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":"128681895","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":"Application of a hierarchical control strategy for coordination of steam plant","authors":"M. Mohamed, Z. Anuar, S. Shafie, P. Roberts","doi":"10.1109/CCA.1993.348345","DOIUrl":"https://doi.org/10.1109/CCA.1993.348345","url":null,"abstract":"A hierarchical control strategy is formulated and applied to a pilot steam plant. A modified interaction prediction method is described and used to execute the control required for the coordination of the plant. Plant tests have shown favourable results.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"64 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":"126122622","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":"Hierarchical control applied to a large scale time-delay model of a river","authors":"A. Alimi, N. Derbel, A. Ouali, M. Kamoun","doi":"10.1109/CCA.1993.348317","DOIUrl":"https://doi.org/10.1109/CCA.1993.348317","url":null,"abstract":"We study the hierarchical control of interconnected systems with time-delays. The classical approach of delay approximation by Taylor series expansion is compared to a new approach consisting of directly injecting the delay terms of the system state equation into the interconnection variables. This provides a reduced order model without any approximation as compared to the first approach. The algorithm of this method is applied to the pollution control of a river and the simulation results are compared to previous works using the first approach on the same example. The efficiency of the approach is clearly shown.<<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":"124607050","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 and computer aided analysis of switching regulators","authors":"Qing Wang, J. Martí","doi":"10.1109/CCA.1993.348275","DOIUrl":"https://doi.org/10.1109/CCA.1993.348275","url":null,"abstract":"A unique model of pulse-width-modulated (PWM) converters, operating in the continuous conduction mode, is developed. This model is compatible with general purpose electronic circuit programs such as SPICE. It can be used to simulate DC, small signal and transient behavior of PWM converters. The simulation of switching regulators is simplified by using this equivalent circuit model to replace the nonlinear part of the PWM converters. An effective switching regulator analysis program, called SWAN, is developed and used to simulate small-signal characteristics of a switching regulator.<<ETX>>","PeriodicalId":276779,"journal":{"name":"Proceedings of IEEE International Conference on Control and Applications","volume":"9 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":"126446608","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}