Relevant bibliographies by topics / MRAS

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'MRAS'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "MRAS"

1

Casale, W. L., D. G. Mcconnell, S. Y. Wang, Y. J. Lee, and J. E. Linz. "Expression of a gene family in the dimorphic fungus Mucor racemosus which exhibits striking similarity to human ras genes." Molecular and Cellular Biology 10, no. 12 (December 1990): 6654–63. http://dx.doi.org/10.1128/mcb.10.12.6654.

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Sporulation, spore germination, and yeast-hypha dimorphism in the filamentous fungus Mucor racemosus provide useful model systems to study cell development in eucaryotic cells. Three RAS genes (MRAS1, MRAS2, and MRAS3) from M. racemosus have been cloned, and their nucleotide sequences have been determined. The predicted amino acid sequences and the sizes of the three MRAS proteins exhibit a high degree of similarity with other ras proteins, including that encoded by H-ras, which have been implicated in regulation of proliferation and development in eucaryotic cells by mediating signal transduction pathways. The MRAS proteins show conservation of functional domains proposed for ras proteins, including guanine nucleotide interaction domains, an effector domain, a binding epitope for neutralizing antibody Y13-259, and the COOH-terminal CAAX box, which is a site of thiocylation and membrane attachment. Amino acid sequences unique to each MRAS protein occur adjacent to the CAAX box, consistent with the location of the hypervariable region in other ras proteins. Northern (RNA) analysis was used to study expression of the three MRAS genes in relation to cell development. Gene-specific probes for two of these genes, MRAS1 and MRAS3, hybridized to different 1.3-kb mRNA transcripts. The accumulation of these transcripts depended on the developmental stage, and this pattern was different between the two MRAS genes. No transcript for MRAS2 was detected in the developmental stages examined. The unique patterns of MRAS transcript accumulation suggest that individual MRAS genes and proteins may play distinct roles in cell growth or development.
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Casale, W. L., D. G. Mcconnell, S. Y. Wang, Y. J. Lee, and J. E. Linz. "Expression of a gene family in the dimorphic fungus Mucor racemosus which exhibits striking similarity to human ras genes." Molecular and Cellular Biology 10, no. 12 (December 1990): 6654–63. http://dx.doi.org/10.1128/mcb.10.12.6654-6663.1990.

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Sporulation, spore germination, and yeast-hypha dimorphism in the filamentous fungus Mucor racemosus provide useful model systems to study cell development in eucaryotic cells. Three RAS genes (MRAS1, MRAS2, and MRAS3) from M. racemosus have been cloned, and their nucleotide sequences have been determined. The predicted amino acid sequences and the sizes of the three MRAS proteins exhibit a high degree of similarity with other ras proteins, including that encoded by H-ras, which have been implicated in regulation of proliferation and development in eucaryotic cells by mediating signal transduction pathways. The MRAS proteins show conservation of functional domains proposed for ras proteins, including guanine nucleotide interaction domains, an effector domain, a binding epitope for neutralizing antibody Y13-259, and the COOH-terminal CAAX box, which is a site of thiocylation and membrane attachment. Amino acid sequences unique to each MRAS protein occur adjacent to the CAAX box, consistent with the location of the hypervariable region in other ras proteins. Northern (RNA) analysis was used to study expression of the three MRAS genes in relation to cell development. Gene-specific probes for two of these genes, MRAS1 and MRAS3, hybridized to different 1.3-kb mRNA transcripts. The accumulation of these transcripts depended on the developmental stage, and this pattern was different between the two MRAS genes. No transcript for MRAS2 was detected in the developmental stages examined. The unique patterns of MRAS transcript accumulation suggest that individual MRAS genes and proteins may play distinct roles in cell growth or development.
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M’hamed, Larbi, Adjir Roufaida, and Ait ameur mezyane Nawal. "Sensorless control of PMSM with fuzzy model reference adaptive system." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 4 (December 1, 2019): 1772. http://dx.doi.org/10.11591/ijpeds.v10.i4.pp1772-1780.

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<p>To improve the performance of permanent-magnet synchronous motor (PMSM) drives powered by the voltage inverter with PWM control, a sensorless control scheme based on a Model Reference Adaptive System (MRAS) a fuzzy logic controller (FLC) based in with fuzzy supervisor structure. The major drawbacks of the conventional MRAS, namely chattering phenomena, high-order harmonics andexternal noise, are discussed. These drawbacks affect the estimated speed accuracy of the MRAS and reduce the control reliability of the system. To eliminate these drawbacks, an FLC is designed and integrated into the MRAS to adjust the observer gain to reduce the chattering in closed loop speed and closed loop current/torque. Comparative simulations using the proposed Fuzzy-MRAS and the conventional MRAS are performed to validate the effectiveness of the proposed FLC structure. Performance simulations of the overall proposed Fuzzy-MRAS based sensorless control scheme are performed to verify the robustness and control reliability of the system. The results show that the proposed Fuzzy MRAS has satisfactory performances with reduction of total harmonic distortion generated in the phase currents.</p>
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R, Mini, Shabana Backer P., B. Hariram Satheesh, and Dinesh M. N. "Low Speed Estimation of Sensorless DTC Induction Motor Drive Using MRAS with Neuro Fuzzy Adaptive Controller." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 5 (October 1, 2018): 2691. http://dx.doi.org/10.11591/ijece.v8i5.pp2691-2702.

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<p>This paper presents a closed loop Model Reference Adaptive system (MRAS) observer with artificial intelligent Nuero fuzzy controller (NFC) as the adaptation technique to mitigate the low speed estimation issues and to improvise the performance of the Sensorless Direct Torque Controlled (DTC) Induction Motor Drives (IMD). Rotor flux MRAS and reactive power MRAS with NFC is explored and detailed analysis is carried out for low speed estimation. Comparative analysis between rotor flux MRAS and reactive power MRAS with PI as well as NFC as adaptive controller is performed and results are presented in this paper. The comparative analysis among these four speed estimation methods shows that reactive power MRAS with NFC as adaptation mechanism shows reduced speed estimation error and actual speed error at steady state operating conditions when the drive is subjected to low speed operation. Simulation carried out using MATLAB-Simulink software to validate the performance of the drive especially at low speeds with rated and variable load conditions.</p>
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Yang, Ling Xiao, and Jing Zhang. "Simulation Research of Vector Control System Based on the Improved MRAS Speed Sensorless." Applied Mechanics and Materials 273 (January 2013): 419–23. http://dx.doi.org/10.4028/www.scientific.net/amm.273.419.

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According to the basic principle of vector control for the asynchronous motor, a speed sensorless vector control system of asynchronous motor is bulit which based on the Model Reference Adaptive System (MRAS) theory. The traditional MRAS speed identification algorithm is vulnerable to the effects of stator resistance, an improved method of MRAS speed identification is put forward. A simulation model of the speed sensorless vector control system based on MRAS is bulit in Matlab/simulink, the simulation results show that the speed estimation method can accurately calculate the speed of motor.
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Wenghofer, Elizabeth F. "Research In Medical Regulation: An Active Demonstration of Accountability." Journal of Medical Regulation 101, no. 3 (September 1, 2015): 13–17. http://dx.doi.org/10.30770/2572-1852-101.3.13.

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To a large extent, health care regulation has been an “evidence-free” zone largely informed by anecdotal, traditional and legal considerations. Medical regulatory authorities (MRAs) are the owners of unique and valuable information regarding the performance of the medical profession. Innovative partnerships between teams of researchers and MRAs can be conducted ethically, securely and confidentially and will enable MRAs to undertake research that would otherwise be beyond their technical capabilities. Research will allow MRAs to gain a more nuanced understanding of the personal and environmental factors that impact on physician performance as well as how performance can be best maintained and improved. Additionally, the MRAs are the primary decision-making bodies able to capitalize on the results of such research activities in their policy making processes. By engaging in research, MRAs can advance the state of knowledge in medical regulation and, in doing so, actively demonstrate their commitment to accountability and transparency to both the public and the profession. Actively working to generate evidence to support accountability in decision making is a step towards making evidence-informed medical regulation a reality.
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Kolkhof, Peter, and Lars Bärfacker. "30 YEARS OF THE MINERALOCORTICOID RECEPTOR: Mineralocorticoid receptor antagonists: 60 years of research and development." Journal of Endocrinology 234, no. 1 (July 2017): T125—T140. http://dx.doi.org/10.1530/joe-16-0600.

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The cDNA of the mineralocorticoid receptor (MR) was cloned 30 years ago, in 1987. At that time, spirolactone, the first generation of synthetic steroid-based MR antagonists (MRAs), which was identified in preclinical in vivo models, had already been in clinical use for 30 years. Subsequent decades of research and development by Searle & Co., Ciba-Geigy, Roussel Uclaf and Schering AG toward identifying a second generation of much more specific steroidal MRAs were all based on the initial 17-spirolactone construct. The salient example is eplerenone, first described in 1987, coincidentally with the cloning of MR cDNA. Its launch on the market in 2003 paralleled intensive drug discovery programs for a new generation of non-steroidal MRAs. Now, 30 years after the cDNA cloning of MR and 60 years of clinical use of steroidal MRAs, novel non-steroidal MRAs such as apararenone, esaxerenone and finerenone are in late-stage clinical trials in patients with heart failure, chronic kidney disease (CKD), hypertension and liver disease. Finerenone has already been studied in over 2000 patients with heart failure plus chronic kidney disease and/or diabetes, and in patients with diabetic kidney disease, in five phase II clinical trials. Here, we reflect on the history of the various generations of MRAs and review characteristics of the most important steroidal and non-steroidal MRAs.
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Ghany, M. A. Abdel, and Mohamed A. Shamseldin. "Model reference self-tuning fractional order PID control based on for a power system stabilizer." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 3 (September 1, 2020): 1333. http://dx.doi.org/10.11591/ijpeds.v11.i3.pp1333-1343.

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<p><span lang="EN-US">This paper presents a novel approach of self-tuning for a Modified Fractional Order PID (MFOPID) depends on the Model Reference Adaptive System (MRAS). The proposed self-tuning controller is applied to Power System Stabilizer (PSS). Takaji-Sugeno (TS) fuzzy logic technique is used to construct the MFOPID controller. The objective of MRAS is to update the five parameters of Takaji-Sugeno Modified FOPID (TSMFOPID) controller online. For different operating points of PSS, MRAS is applied to investigate the effectiveness of proposed controllers. The harmony optimization technique used to obtain the optimal parameters of TSMFOPID controllers and MRAS parameters. For different operating points with different disturbance under parameters variations the simulation results are obtained. This is to show that Self-Tuning of TSMFOPID based on (MRAS) have better performance than the fixed parameters TSMOFOPID controller.</span></p>
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Ojionuka, Everestus, Ifeanyi Chinaeke-Ogbuka, Cosmas Ogbuka, and Cajethan Nwosu. "A simplified sensorless speed control of permanent magnet synchronous motor using model reference adaptive system." Journal of Electrical Engineering 70, no. 6 (December 1, 2019): 473–79. http://dx.doi.org/10.2478/jee-2019-0080.

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Abstract A simplified sensorless speed control of permanent magnet synchronous motor (PMSM) using model reference adaptive system (MRAS) is presented. The MRAS is designed and incorporated in a complete closed loop PMSM control system fed by a three-phase inverter that utilizes a simplified hysteresis current control (HCC) to generate gating signals. Accurate rotor position, being essential in PMSM control, is estimated using MRAS rather encoders and resolvers which are explicit position sensors thereby eliminating the drawbacks of the traditional speed sensors in drive systems. The performance of this model is compared with an existing model that utilizes encoders and resolvers. Superior performance was obtained from this new model with MRAS. After initial starting transients, it is observed that the rotor speed for the model with MRAS settled to steady state at 0.10 seconds as against the model with speed sensor which attained steady state at 0.31 seconds. Torque response follows the same pattern to return to the load torque of 11Nm at steady state after starting. After speed reversal, the model with MRAS restored to steady state to track the negative speed command at 0.44 seconds. This is a superior performance compared to the model with speed sensor which settled at 0.60 seconds after speed reversal. The results have clearly shown the superiority of sensorless MRAS over traditional drive models with speed sensors. The software used for this research is MATLAB/Simulink 2017 model.
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Abd Samat, Ahmad Asri, Dahaman Ishak, Shahid Iqbal, and Aimi Idzwan Tajudin. "Comparison between Takagi Sugeno FIS and PI Controller: An Adaptation Scheme of MRAS for Speed Sensorless Control of PMSM." Applied Mechanics and Materials 785 (August 2015): 193–97. http://dx.doi.org/10.4028/www.scientific.net/amm.785.193.

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— This paper proposes modification of an adaptation scheme which aims to replace the conventional PI controller for MRAS by using Fuzzy Logic Control (FLC). This FLC based on Takagi-Sugeno Fuzzy Logic Inference System (FIS). To achieve this goal, field oriented control (FOC) method has been utilized to control the speed of PMSM with the implementation of MRAS to observe the rotor position and speed of the motor. PMSM becomes the reference model for MRAS while the current model in the rotor reference frame is set as the adjustable model. The Takagi Sugeno Fuzzy FIS is executed in the MRAS adaptive scheme in order to tune the errors between the reference and adjustable model. The effectiveness of the Takagi Sugeno FIS to tune the errors in MRAS scheme is compared with the conventional PI controller. The proposed method clearly indicates improved motor performance over a wide range of operating speeds since is capable of tracking the motor speed effectively.
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Dissertations / Theses on the topic "MRAS"

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Zbede, Yaman. "Model predictive MRAS estimator for sensorless induction motor drives." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3771.

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The project presents a novel model predictive reference adaptive system (MRAS) speed observer for sensorless induction motor drives applications. The proposed observer is based on the finite control set-model predictive control principle. The rotor position is calculated using a search-based optimization algorithm which ensures a minimum speed tuning error signal at each sampling period. This eliminates the need for a proportional integral (PI) controller which is conventionally employed in the adaption mechanism of MRAS observers. Extensive simulation and experimental tests have been carried out to evaluate the performance of the proposed observer. Both the simulation and the experimental results show improved performance of the MRAS scheme in both open and closed-loop sensorless modes of operation at low speeds and with different loading conditions including regeneration. The proposed scheme also improves the system robustness against motor parameter variations and increases the maximum bandwidth of the speed loop controller. However, some of the experimental results show oscillations in the estimated rotor speed, especially at light loading conditions. Furthermore, due to the use of the voltage equation in the reference model, the scheme remains sensitive, to a certain extent, to the variations in the machine parameters. Therefore, to reduce rotor speed oscillations at light loading conditions, an adaptive filter is employed in the speed extraction mechanism, where an adaptation mechanism is proposed to adapt the filter time constant depending on the dynamic state of the system. Furthermore, a voltage compensating method is employed in the reference model of the MP-MRAS observer to address the problems associated with sensitivity to motor parameter variation. The performance of the proposed scheme is evaluated both experimentally and by simulation. Results confirm the effectiveness of the proposed scheme for sensorless speed control of IM drives.
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Yang, Chao. "Speed Sensorless Control for Induction Motor Drives with AI-Based MRAS." Thesis, University of Newcastle Upon Tyne, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525087.

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Shiref, Muez. "Investigation into PI controller output ripple in MRAS based electrical drives." Thesis, University of Newcastle upon Tyne, 2013. http://hdl.handle.net/10443/2264.

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In Sensorless speed drives, which employ a model reference adaptive system (MRAS) with a PI based adaptation mechanism, the gains of the adaptation mechanism play an important role into the general performance of the drives. The higher the gain, the faster the response and the more robust the drive is going to be against load disturbance. Although it is desirable to utilise an adaptation mechanism with high PI gains, it was demonstrated that high gains will cause the estimated speed to exhibit a high level of noise. More recently it was identified that the generated noise consists of high-order harmonics. As far as the literature is concerned, even though the high-order harmonic phenomenon was identified and addressed by few researchers, there was no description in their literature of the generated high-order harmonics or an assessment of their effect in terms of being problematic. Therefore, the aim of this research is to not only investigate the generation of high-order harmonics, but also to establish whether any generated noise in the estimated speed bear an effect on the overall speed estimation process. An MRAS based speed estimator is implemented to calculate the rotor flux- linkage and the speed estimates required in achieving field orientation and establishing speed control. An investigation has been carried out to gauge how the PI controller gains can influence the speed estimation process of the drive system. As well as examining the estimated speed for any trace of excessive noise and harmonics generation. It is revealed experimentally that no high-order harmonics were generated while implementing an adaptation mechanism with high PI gains. However, it was found that high PI gains do causes the estimated speed to become relatively noisy and also starts to carry some fundamental frequency components relevant to the stator’s electrical frequency. Therefore a programmable adaptive adjustment mechanism has been successfully developed not only to avoid the excessive generation of noise but also improve the speed estimation process. The performance of both of the static adaptation mechanism and the proposed adaptive one was assessed and compared.
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Mathieu, Marie-Emmanuelle. "Etude de la balance pluripotence-differenciation des cellules souches embryonnaires murines sous l'effet du LIF : rôle du gène MRAS." Thesis, Bordeaux 2, 2011. http://www.theses.fr/2011BOR21878/document.

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Le LIF (Leukemia Inhibitory factor), une cytokine de la famille de l’Interleukine 6, permet le maintien de la pluripotence des cellules souches embryonnaires murines (CSEm) in vitro. Dans le but de comprendre les mécanismes d’action du LIF dans ce modèle d’étude, une analyse sur puces à ADN a été réalisée et a permis d’identifier trois « signatures LIF » : les gènes « Pluri » (pour Pluripotence), dont le niveau d’expression relatif chute suite au retrait de cette cytokine, et deux catégories de gènes « Lifind » (pour LIF induit) dont le niveau d’expression relatif augmente suite à un ajout de LIF après une culture de 24 ou 48 heures sans cette cytokine. Nous avons mis au point des tests fonctionnels permettant d’étudier la fonction des gènes cibles du LIF dans notre modèle d’étude. Ainsi, nous avons mis en évidence le rôle d’un gène « Pluri », Mras/Rras3, une petite GTPase de la famille Ras, dans la régulation de l’expression d’une part de marqueurs de pluripotence, tels que Oct4 et Nanog et d’autre part de marqueurs de différenciation, tels que Lef1 et Fgf5
LIF (Leukemia Inhibitory factor), a cytokine Interleukin 6 family, allows maintaining the pluripotency of murine embryonic stem cells (mESC) in vitro. To understand the mechanisms of action of the LIF in this model, a microarray analysis was conducted and identified three « signatures LIF » : the « Pluri » (for Pluripotency) genes, whose the relative level of expression falls following the withdrawal of this cytokine, and two classes of « Lifind » (for LIF induced) genes, whose the relative expression level increases as a result of LIF addition after a culture of 24 or 48 hours without this cytokine. We have developed functional tests to study the function of the target genes of LIF in our study model. Thus, we have investigated the role of a « Pluri » gene, Mras/Rras3, a small GTPase of the Ras family, in the regulation of the expression on the one hand of markers of pluripotency, such as Oct4 and Nanog, and on the other hand of differentiation markers, such as Lef1 and Fgf5
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Salloum, Georges. "Contribution à la commande robuste de la machine asynchrone à double alimentation." Phd thesis, Toulouse, INPT, 2007. http://oatao.univ-toulouse.fr/7534/1/salloum.pdf.

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Le travail présenté dans cette thèse apporte, entre autres, une contribution aux méthodes d'analyse et de synthèse de la commande robuste des Machines Asynchrones à Double Alimentation (MADA) alimentées par deux onduleurs de tension avec deux bus continus distincts. Nous introduisons, dans un premier chapitre, la commande vectorielle classique de la MADA munie de capteurs mécaniques. Ce chapitre se distingue par une nouvelle approche pour assurer le découplage des courants de la MADA dans un repère (d-q) conduisant à des fonctions de transfert simples, et par conséquent, un calcul simplifié des correcteurs. Ce chapitre se termine par une étude prouvant la robustesse du découplage et de la commande vis-à-vis des variations paramétriques de la machine. La commande robuste de la MADA, par l'approche H∞, est ensuite abordée en faisant une comparaison entre quatre stratégies de contrôle : la sensibilité mixte, une variante de la sensibilité mixte, le loop-shaping et la m-synthèse. Une étude par m-analyse de la robustesse en stabilité et en performance offre un critère de choix du correcteur. La réalisabilité du correcteur sera à son tour un critère déterminant du choix de la méthode de correction. Dans une dernière partie, nous centrons notre intérêt sur la commande robuste de la MADA sans capteurs mécaniques en travaillant sur des méthodes d'estimation de la vitesse et de l'angle mécanique. Nous limitons cette étude à l'introduction de deux méthodes d'estimation : La MRAS, éventuellement associée à un filtre de KALMAN, et l'injection d'une composante haute fréquence associée à un traitement numérique (FFT – STFT) pour en déduire la vitesse. La première approche est simple à implanter mais elle est très sensible aux variations paramétriques, surtout la résistance statorique, tandis que la deuxième est complètement insensible à ces variations mais très lourde en calcul. Dans cette partie, nous nous intéressons aussi à la commande numérique de la MADA.
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Mališ, Martin. "Algoritmy bezsnímačového řízení pohonu se synchronním motorem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220151.

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The goal of this thesis is to deal with comparison of algorithms in the field of sensorless control of permanent magnet synchronous motor. It is focused mainly on deterministic methods of estimation, verification of their dynamic responses and the influence of parasitic effects. Implementation of selected algortihms on DSP in fractional arithmetic with verification by Processor-in-the-loop method is described in second part. The last part describes use of algorithms on real drive.
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Pettersson, Ulf. "Identification and Adaptive Control of a Coordinate Measuring Machine." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2293.

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Important factors in manufacturing are quality and cost. Measuring machines play an important role for these fields. In order to meet higher demands on cost and accuracy, measuring machines can be constructed with weaker materials and increased mechanical flexibilities, and therefore there is a need to include the flexibilities in measuring machine models to obtain good performance.

The core theme in this thesis is modeling and idenfication of the physical parameters of drive mechanisms of a Brown&Sharpe Inc. Global A coordinate measuring machine. The approximation made is that the drive mechanisms can be described by a mass connected by springs, dampers and gear changes. It has been found that a one-spring model gives a reasonably good description of the studied CMM drive mechanism. The physical parameters of this model are identified using off-line algorithms. The algorithms are based on prediction error methods. For the off-line identification the MATLAB System Identification Toolbox and the bond graph representation is used.

The chosen model is then used for control. Traditional control and a Model-reference Adaptive System is derived and studied with the aim to increase the damping of CMM drive mechanisms. It is found that the adaptive system has very good disturbance rejection and can correct for drastic model errors. Another impact is that the damping of the studied drive mechanism can be increased with at least a factor of nine.

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Trinkūnaitė, Ingrida. "Asinchroninės bejutiklės pavaros modeliavimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110621_170245-16691.

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Baigiamajame darbe sudarytas uždarosios asinchroninės bejutiklės vektoriškai valdomos pavaros imitacinis modelis ir ištirtos charakteristikos. Teorinėje darbo dalyje yra aptariami asinchroninių elektros pavarų privalumai bei šiose pavarose naudojami greičio jutikliai. Aprašomi stebiklių privalumai bei trūkumai, pagrindžiamas jų naudojimas asinchroninėse pavarose. Nagrinėjami bejutiklių elektros pavarų ypatumai, aprašomi vektorinio valdymo bendrieji principai bei aprašomi bejutiklėse vektoriškai valdomose pavarose naudojamų stebiklių modeliai. Pateikiami du skirtingi asinchroninių variklių matematiniai modeliai. Tiriamojoje dalyje parenkamas asinchroninio variklio modelis, tiriant abiejų imitacinių modelių dinamines greičio charakteristikas. Sudaromas stebiklio imitacinis modelis. Tiriamos stebiklio greičio dinaminės charakteristikos, sudaroma uždaroji greičio reguliavimo sistema su stebikliu. Analizuojamos uždarosios greičio reguliavimo sistemos greičio charakteristikos be apkrovos, su šuoline apkrova ir harmoniškai kintančia apkrova. Nagrinėjama sistemos stiprinimo koeficiento įtaka uždarosios greičio reguliavimo sistemos greičio charakteristikų pereinamiesiams procesams. Magistro darbas baigiamas tyrimo išvadomis, kuriose aptariamas darbo rezultatų realaus pritaikymo galimybės. Darbą sudaro 8 dalys: įvadas, žymėjimai, literatūros šaltinių analizė, tyrimo tikslas ir uždaviniai, teorinė dalis, tiriamoji dalis išvados ir pasiūlymai, literatūros šaltiniai.
The final master degree thesis presents sensorless vector controlled induction motor drive simulation model and characteristics. In the analytic part of master thesis advantages of induction motor drives and speed sensors are described. Advantages and disadvantages of speed estimators are presented and purpose of using them are proved. Peculiarities of sensorless motor drives, principles of vector control and models of speed estimators are analyzed. Two simulation models of induction motor are proposed. In the research part characteristics of induction motors are compared and motor model is chosen. Characteristics of open loop induction motor drive are investigated and simulation model of closed loop induction motor drive with speed estimator is designed. Characteristics of closed loop control system at no load, constant load and harmonic load are analyzed and influence of speed controller gain is considered. Thesis is closed with conclusions about designed system application in real projects. Structure: introduction, list of symbols, literature review, the study aims and objectives, the theoretical part, research part, conclusions and proposals, references.
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Mehazzem, Fateh. "Contribution à la commande d’un moteur asynchrone destiné à la traction électrique." Thesis, Paris Est, 2010. http://www.theses.fr/2010PEST1032/document.

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Le travail présenté dans cette thèse a pour objectif d'apporter une contribution aux méthodes de commande et d'observation des machines asynchrones destinées à la traction électrique. Dans ce contexte, plusieurs algorithmes ont été développés et implémentés. Après une présentation rapide de la commande vectorielle classique, de nouvelles approches de commande non linéaire sont proposées : il s'agit plus précisément de la commande backstepping classique et sa variante avec action intégrale. Une deuxième partie est consacrée à l'observation et à l'estimation des paramètres et des états de la machine, basée sur des structures MRAS-modes glissants d'une part et sur des structures de filtrage synchrone d'autre part. Une analyse détaillée du problème de fonctionnement à basse vitesse nous a conduit à proposer une solution originale dans le cadre d'une commande sans capteur mécanique. Le problème de la dégradation du couple en survitesse a été traité par un algorithme de défluxage basé sur la conception d'un contrôleur de tension. Enfin, nous avons proposé un algorithme d'optimisation afin de minimiser les pertes dans l'ensemble Onduleur-Machine
The work presented in this thesis aims to contribute to the control and observation of the induction machines for electric traction. Several algorithms have been developed and implemented. After a fast presentation of the classical vector control, new approaches of non-linear control are proposed : the classical backstepping and integral backstepping. A second part deals with the observation and the estimation of parameters and states of the machine, based on MRAS-Sliding Mode structures on one hand and on synchronous filtering structures on the other hand. A detailed analysis of the operation at low speed led us to propose an original solution for a Sensorless control. The torque degradation in field weakening zone was treated by a voltage regulation controller. Finally, we proposed losses minimization algorithm for the Inverter-Machine set
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Tanagardi, Mehmet. "Radiation Pattern Reconfigurable Horn Antenna Based on Parasitic Layer Concept." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7623.

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In recent years, multi-functional reconfigurable antennas (MRA) has attracted much attention in wireless communication. The reconfigurable antenna can adapt itself with changing system conditions, and it can provide different multi-functionalities which can give better system performances. Instead of using multiple antennas, a single reconfigurable antenna can provide the same performance and occupy less space. By using the parasitic layer technique, an antenna can be turned into a reconfigurable antenna. The main objective of this thesis is to study radiation pattern reconfiguration of the horn antenna by using the parasitic layer concept. The MRA consists of a single horn, dielectric loaded truncated pyramid (DLTP), and the parasitic layer. The antenna that is chosen in this thesis is the horn antenna because it provides high directivity. DLTP is used for magnification purpose. The results show that three modes of operations that provide better performances compared to the single horn antenna are achieved.
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Books on the topic "MRAS"

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Mrak. Beograd: Narodna knj. Alfa, 1997.

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MRSA. Detroit: Greenhaven Press, 2012.

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Sheen, Barbara. MRSA. Detroit: Lucent Books, 2010.

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Vulin, Aleksandar. Mrak. Beograd: Izdavački grafički atelje "M", 2010.

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Jevtić, Branislav. Rujni mraz. Beograd: Dereta, 2009.

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Mart, Mikhail. Bezdomnyĭ mrak. Moskva: "Ripol Klassik", 2003.

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Graf, John F. U.S. MRAPs. Carrollton, TX: Squadron/Signal Publications, 2013.

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Ḱulavkova, Katica. Tenok mraz. Skopje: Makavej, 2008.

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Jevtić, Branislav. Rujni mraz. Beograd: Dereta, 2009.

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Bivšek, Gašper. Provinca. Mrak. Ljubljana: Študentska založba, 2012.

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Book chapters on the topic "MRAS"

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Yang, Chao, and John W. Finch. "A Comparison of Induction Motor Speed Estimation Using Conventional MRAS and an AI-Based MRAS Parallel System." In Lecture Notes in Electrical Engineering, 75–85. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2311-7_7.

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Shiva, Badini Sai, and Vimlesh Verma. "MRAS Based Speed Sensorless Vector Controlled PMSM Drive." In Advances in Intelligent Systems and Computing, 549–56. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30465-2_61.

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Basnet, Bigyan, and Hong-Hee Lee. "Rotor Flux Estimation for Low Speed Induction Motor Sensorless Drives with MRAS." In Mobile and Wireless Technologies 2017, 509–18. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5281-1_57.

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Lipcak, Ondrej, and Jan Bauer. "Optimization of Voltage Model for MRAS Based Sensorless Control of Induction Motor." In Lecture Notes in Electrical Engineering, 758–68. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-14907-9_73.

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Cockerill, MacKenzie. "Convergence on Common Ground: MRAs, Memes and Transcultural Contexts of Digital Misogyny." In Gender Hate Online, 87–110. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-96226-9_5.

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Bagavos, Christos, Nikos Kourachanis, Konstantina Lagoudakou, and Katerina Xatzigiannakou. "Between Reception, Legal Stay and Integration in a Changing Migration Landscape in Greece." In IMISCOE Research Series, 173–92. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67284-3_9.

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AbstractSignificant transformations in the migratory landscape of Greece have been observed recently. In practice, the mixed flows of migrants and refugees have modified the role of Greece as a migrant-receiving country. Immigration, in terms of either transit or settled immigrants, has become a major policy issue; additionally, it has mobilized national authorities, international bodies as well as formal and informal civil society organizations. Changes in the immigration landscape, along with adverse economic conditions, has led to further efforts by public authorities in the effective management of refugee flows and reducing the risks of irregular stay for a significant number of migrants. Despite significant developments in the legislative framework for the integration of migrants, refugees and asylum seekers (MRAs) into the labor market, their access to employment remains more of a secondary issue for policy actors.
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Vo, Hau Huu, Pavel Brandstetter, and Chau Si Thien Dong. "MRAS Observers for Speed Estimation of Induction Motor with Direct Torque and Flux Control." In AETA 2015: Recent Advances in Electrical Engineering and Related Sciences, 325–35. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27247-4_29.

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Mohan Krishna, S., and J. L. Febin Daya. "An Improved Stator Resistance Adaptation Mechanism in MRAS Estimator for Sensorless Induction Motor Drives." In Advances in Intelligent Systems and Computing, 371–85. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2035-3_38.

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Goyal, Trishla, and Bhavnesh Kumar. "Analysis of Stator Current MRAS for Speed Estimation of Induction Motor Aided with ANN." In Lecture Notes in Electrical Engineering, 425–35. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6772-4_37.

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Abdelbaset, Adel, Yehia S. Mohamed, Abou-Hashema M. El-Sayed, and Alaa Eldin Hussein Abozeid Ahmed. "A Modified MRAS Observer for Sensorless Control of a Wind Driven DFIG Connected to Grid." In Wind Driven Doubly Fed Induction Generator, 21–39. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-70108-0_3.

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Conference papers on the topic "MRAS"

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Luk, Andrew M. Y., Eric H. K. Fung, and W. C. Gan. "2-DOF Planar Motion Control System Using Model Reference Adaptive Control (MRAC) Algorithm." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86089.

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This paper reports the application of Model Reference Adaptive Control (MRAC) to an X-Y planar motion mechanism. A flexure-based 2-DOF planar motion platform is first developed for the wafer probing purpose and a planar Voice Coil Motor (VCM) is used for driving the mechanism and the flexural bearings. The dynamics of the motion platform is governed by a set of differential equations using the mass-spring-damper model and the Kirchhoff’s circuit laws. Due to the non-linearity of the force constant and the coupling effect of the VCM, a MRAC algorithm is proposed to implement on the motion control system so as to improve the system transient response. In order to guarantee the stability of the Model Reference Adaptive System (MRAS), Lyapunov Theory is adopted in the controller design. The control system performance is simulated using MATLAB /SIMULINK with the considerations of the motor non-linearity and the assembly variation of the flexural mechanism. On the other hand, a conventional PID controller is also constructed for control experiments to compare the transient responses between MRAC and PID control systems. Simulation results revealed that the proposed MRAS outperforms the PID controller for the 2 DOF planar motion system in the presence of sensor noise, disturbing force and parameter variation effects.
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Ajabi Farshbaf, R., M. R. Azizian, and A. Ebrahimi. "NN-MRAS based speed estimator vs. RF-MRAS one: Design and comparison." In 2012 3rd Power Electronics, Drive Systems & Technologies Conference (PEDSTC). IEEE, 2012. http://dx.doi.org/10.1109/pedstc.2012.6183329.

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Wang Zhifu, Teng Qizhi, and Zhang Chengning. "Speed identification about PMSM with MRAS." In 2009 IEEE 6th International Power Electronics and Motion Control Conference. IEEE, 2009. http://dx.doi.org/10.1109/ipemc.2009.5157702.

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Salazar-Heise, Fernando, and Nelson Aros-Onate. "PI-FUZZY and PI Algorithm in MRAS." In 2018 IEEE International Conference on Automation/XXIII Congress of the Chilean Association of Automatic Control (ICA-ACCA). IEEE, 2018. http://dx.doi.org/10.1109/ica-acca.2018.8609854.

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Vonkomer, Jakub, and Milan Zalman. "On the stability of current based MRAS." In IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2013. http://dx.doi.org/10.1109/iecon.2013.6699611.

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Nguyen Duy Cuong, Nguyen Van Lanh, and Dang Van Huyen. "Design of MRAS-based adaptive control systems." In 2013 International Conference on Control, Automation and Information Sciences (ICCAIS). IEEE, 2013. http://dx.doi.org/10.1109/iccais.2013.6720534.

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Lixin, Wang. "Pragmatical Engineering Design Method For Stable MRAS." In IECON '87: Industrial Applications of Control and Simulation, edited by Tom T. Hartley. SPIE, 1987. http://dx.doi.org/10.1117/12.942948.

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Khamari, D., I. Benlaloui, S. Ouchen, A. Makouf, S. Drid, L. Chrifi Alaoui, and M. Ouriagli. "LPV Induction Motor Control with MRAS Speed Estimation." In 2019 8th International Conference on Systems and Control (ICSC). IEEE, 2019. http://dx.doi.org/10.1109/icsc47195.2019.8950563.

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Zhiwu, Huang, Yang Tongguang, Gui Weihua, Shan Yongteng, and Nian Xiaohong. "An Improved Speed Identification Method Based on MRAS." In 2007 Chinese Control Conference. IEEE, 2006. http://dx.doi.org/10.1109/chicc.2006.4346892.

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Zhifu Wang and Chengning Zhang. "Speed identification about enhanced magnetism motor with MRAS." In 2008 7th World Congress on Intelligent Control and Automation. IEEE, 2008. http://dx.doi.org/10.1109/wcica.2008.4594582.

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Reports on the topic "MRAS"

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Daughton, James M. Advanced MRAM Concepts. Fort Belvoir, VA: Defense Technical Information Center, February 2001. http://dx.doi.org/10.21236/ada452441.

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Stark, D. R. MRAP: A Limited Capability. Fort Belvoir, VA: Defense Technical Information Center, February 2008. http://dx.doi.org/10.21236/ada508971.

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Moffeit, Ken, Takashi Maruyama, Yuri Nosochkov, Andrei Seryi, and Mike Wood. Comparison of 2 mrad and 14/20 mrad Crossing Angle Extraction Lines. Office of Scientific and Technical Information (OSTI), July 2006. http://dx.doi.org/10.2172/887075.

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Beech, Russell, and Robert Sinclair. Low Power 256K MRAM Design. Fort Belvoir, VA: Defense Technical Information Center, January 2006. http://dx.doi.org/10.21236/ada449576.

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Sinha, Velu. Architecture of MRMS Simulation: Distributing Processes,. Fort Belvoir, VA: Defense Technical Information Center, January 1987. http://dx.doi.org/10.21236/ada189697.

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Russell, Stuart. Complete Guide to MRS,. Fort Belvoir, VA: Defense Technical Information Center, June 1985. http://dx.doi.org/10.21236/ada328568.

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Cerjan, C., and B. P. Law. Magnetic Random Access Memory (MRAM) Device Development. Office of Scientific and Technical Information (OSTI), January 2000. http://dx.doi.org/10.2172/15006522.

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Pavel Polozov et al. Fiber positioning and MRS response. Office of Scientific and Technical Information (OSTI), May 2004. http://dx.doi.org/10.2172/823951.

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Raymond, David W., Katherine N. Gaither, Yarom Polsky, Steven D. Knudsen, Scott Thomas Broome, Jiann-Cherng Su, Douglas A. Blankenship, and Laurence S. Costin. Development of a Mine Rescue Drilling System (MRDS). Office of Scientific and Technical Information (OSTI), June 2014. http://dx.doi.org/10.2172/1177065.

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Zandberg, Henry. Multi-Role Aviation Weapon System (MRAWS) Trade Study. Fort Belvoir, VA: Defense Technical Information Center, April 2001. http://dx.doi.org/10.21236/ada385919.

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