Institution
University of Akron
Education•Akron, Ohio, United States•
About: University of Akron is a education organization based out in Akron, Ohio, United States. It is known for research contribution in the topics: Polymer & Polymerization. The organization has 17401 authors who have published 29127 publications receiving 702386 citations. The organization is also known as: The University of Akron.
Topics: Polymer, Polymerization, Natural rubber, Copolymer, Monomer
Papers published on a yearly basis
Papers
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TL;DR: In this article, the phase currents of a switched reluctance machine are profiled to minimize the torque ripple of the phase current of the machine, which is achieved in three steps: the first step is to design a machine that has symmetric torque characteristics with an extended flat portion, the second step was to find the required current profile through simulation, and the third step is the fine tuning of the profile.
Abstract: This paper presents a novel method of profiling the phase currents to minimize the torque ripple of a switched reluctance machine. The method is a combination of machine design and control algorithm. The minimization is accomplished in three steps: The first step is to design a machine that has symmetric torque characteristics with an extended flat portion, the second step is to find the required current profile through simulation, and the third step is the fine tuning of the profile. The simulation is done to verify the method through a coupling of the finite-element-based machine model and the Matlab/Simulink-based dynamic controller model. The coupled simulation considers the nonlinearities, electrical loss, magnetic loss, and mutual coupling. Experimental verification validated the torque-ripple minimization procedure.
160 citations
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04 Oct 1992TL;DR: In this article, a fuzzy logic controller chooses the switching states based on a set of fuzzy state variables, such as flux position, error in flux magnitude and error in torque, which are determined by observing the vector diagram of flux and currents.
Abstract: An induction machine operated with a direct self controller (DSC) shows a sluggish response during startup and under changes of torque command. Fuzzy logic is used in conjunction with direct self control to minimize these problems. A fuzzy logic controller chooses the switching states based on a set of fuzzy variables. Flux position, error in flux magnitude and error in torque are used as fuzzy state variables. Fuzzy rules are determined by observing the vector diagram of flux and currents. The operation of the direct self controller becomes difficult at low speeds due to the effect of change in stator resistance on the flux measurements. To improve the system performance at low speeds a fuzzy resistance estimator is proposed to eliminate the error due to the change in stator resistance. At constant flux and torque commands any change in stator resistance of the induction machines causes an error in stator current. This error is utilized by the fuzzy resistance estimator to correct the stator resistance used by the controller to match the machine resistance. Both a fuzzy controller and fuzzy resistance estimator are simulated for a 3 HP induction motor. The simulation results demonstrate a good performance. >
160 citations
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TL;DR: A review of the literature on rapid solidification processing techniques for discontinuously-reinforced metal matrix composites is presented in this article, where the authors present a cross-section of techniques and experimental results obtained, in recent years, by numerous investigators.
160 citations
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TL;DR: Simulated video-taped employment interviews were constructed in which a black and a white applicant presented, in addition to job-related statements, biographical background information which was e... as mentioned in this paper.
Abstract: Simulated video-taped employment interviews were constructed in which a black and a white applicant presented, in addition to job-related statements, biographical background information which was e...
160 citations
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TL;DR: In this paper, the effect of the quality of the bone and of the cement pressurization magnitude and duration on the fixation achieved with polymethylmethacrylate (PMMA) bone cement is studied in vitro.
159 citations
Authors
Showing all 17460 results
Name | H-index | Papers | Citations |
---|---|---|---|
Pulickel M. Ajayan | 176 | 1223 | 136241 |
Alan J. Heeger | 171 | 913 | 147492 |
Josef M. Penninger | 154 | 700 | 107295 |
Liming Dai | 141 | 781 | 82937 |
Chao Zhang | 127 | 3119 | 84711 |
Ulrich S. Schubert | 122 | 2229 | 85604 |
Vijay P. Singh | 106 | 1699 | 55831 |
Andrea Natale | 106 | 945 | 52520 |
Bruce J. Avolio | 105 | 220 | 69603 |
Thomas A. Lipo | 103 | 682 | 43110 |
Virgil Percec | 101 | 798 | 42465 |
Chang Liu | 97 | 1099 | 39573 |
Gareth H. McKinley | 97 | 467 | 34624 |
Paul J. Flory | 93 | 247 | 59120 |
Soo-Jin Park | 86 | 1282 | 37204 |