{"title":"Minimizing effects of disturbing signals through a minimum square-error criterion","authors":"J. Sobral","doi":"10.1109/TAC.1961.1105229","DOIUrl":"https://doi.org/10.1109/TAC.1961.1105229","url":null,"abstract":"One of the reasons for using feedback is the improvement in the rejection of disturbing signals. This improvement can be obtained through an analytical design utilizing as a performance index the integral square-error criterion. In the usual technique the sum of the command signal plus the disturbing signal transferred to the input of the system is used as the input signal. When this is done, one of the two compensating transfer functions (for the particular case of a system with two degrees of freedom) has to be fixed arbitrarily. Then the optimum over-all transfer function, which minimizes the integral of the square of the error between the desired output and the actual one, is calculated and thus the remaining compensator can be obtained. As the technique does not provide a method for determining one of the compensators, and the transferred disturbing signal is a function of this compensator, a required rejection of the disturbing signal may not be satisfied. The purpose of the present paper is to suggest an analytical technique for determining both of the two compensators which have the minimum bandwidth necessary to satisfy a desired over-all transfer function and a required rejection of a disturbing signal. In addition, the technique provides physically realizable compensating transmissions.","PeriodicalId":226447,"journal":{"name":"Ire Transactions on Automatic Control","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130772668","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":"Correction to \"Automatic control of three-dimensional vector quantities\"","authors":"A. Lange","doi":"10.1109/TAC.1961.1105214","DOIUrl":"https://doi.org/10.1109/TAC.1961.1105214","url":null,"abstract":"","PeriodicalId":226447,"journal":{"name":"Ire Transactions on Automatic Control","volume":"696 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123845088","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":"Composite flow-graph technique for the solution of multiloop, multisampler sampled systems","authors":"B. Kuo","doi":"10.1109/TAC.1961.1105225","DOIUrl":"https://doi.org/10.1109/TAC.1961.1105225","url":null,"abstract":"","PeriodicalId":226447,"journal":{"name":"Ire Transactions on Automatic Control","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115991889","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":"Stability and graphical analysis of first-order pulse-width-modulated sampled-data regulator systems","authors":"E. Polak","doi":"10.1109/TAC.1961.1105217","DOIUrl":"https://doi.org/10.1109/TAC.1961.1105217","url":null,"abstract":"Pulse-width-modulated sampled-data systems are described by nonlinear difference equations which do not lend themselves to an exact analytic treatment. This paper presents a graphical technique for the analysis of PWM sampled-data systems with first-order plants. This technique provides a sufficient condition for asymptotic stability in the large, a method for examining the damping properties of the system, a method for computing the step response from any initial condition and, finally, a method for observing and interpreting the effect of varying the system parameters on the step response of the system.","PeriodicalId":226447,"journal":{"name":"Ire Transactions on Automatic Control","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134329617","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":"Stability conditions of pulse-width-modulated systems through the second method of Lyapunov","authors":"T. Kadota, H. Bourne","doi":"10.1109/TAC.1961.1105210","DOIUrl":"https://doi.org/10.1109/TAC.1961.1105210","url":null,"abstract":"PWM systems contain inherent nonlinearities which arise from their modulation scheme. Thus, for a legitimate study of stability, such systems must be treated as nonlinear sampled-data systems without initially resorting to linear approximations. For a nonlinear system whose dynamic behavior is described by a set of first-order difference equations, one of the theorems in the second method of Lyapunov gives, as a sufficient condition for asymptotic stability in the large, the existence in the whole space of a positive-definite Lyapunov's function V , whose difference DeltaV is negative definite. Hence, by choosing a positive-definite quadratic form as V , the sufficient condition is reduced to the negative-definiteness in the whole space of DeltaV . Upon this basis, a systematic procedure of obtaining analytically a sufficient condition for asymptotic stability in the large is developed for various types of PWM systems; the condition is stated as the negativeness of all the eigenvalues of three matrices associated with the PWM system.","PeriodicalId":226447,"journal":{"name":"Ire Transactions on Automatic Control","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125092045","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":"Comment on \"An optimal strategy for a saturating sampled-data system\"","authors":"I. Mufti, C. Desoer, J. Wing","doi":"10.1109/TAC.1961.1105209","DOIUrl":"https://doi.org/10.1109/TAC.1961.1105209","url":null,"abstract":"","PeriodicalId":226447,"journal":{"name":"Ire Transactions on Automatic Control","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121498613","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":"On the time-optimal regulation of plants with numerator dynamics","authors":"E. Lee","doi":"10.1109/TAC.1961.1105221","DOIUrl":"https://doi.org/10.1109/TAC.1961.1105221","url":null,"abstract":"","PeriodicalId":226447,"journal":{"name":"Ire Transactions on Automatic Control","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132331098","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}