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Auswahl der wissenschaftlichen Literatur zum Thema „Asynchronous Transducers“
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Zeitschriftenartikel zum Thema "Asynchronous Transducers"
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Makhsudov, Mokhirbek, und Dilyorbek Karimjonov. „Research algorithm and dynamic characteristics of three-phase electromagnetic current transducers in filter-compensation devices“. E3S Web of Conferences 461 (2023): 01056. http://dx.doi.org/10.1051/e3sconf/202346101056.
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The article presents a three-phase current transducer for filter-compensation devices, representing the value of the stator current of an asynchronous motor. An algorithm for determining the values of the output electric quantities in them was developed based on the methods of interconnecting the loops of the sensitive element of the three-phase electromagnetic current transducer arranged in accordance with the stator slots of the asynchronous motor. In addition, based on this algorithm, the time-dependent dynamic characteristics of the output signal of the sensitive element loops are determined according to the connection method. Based on the dynamic description, it is possible to see the time for the output voltage signal of the three-phase current transducer to reach stability and the effect of high harmonic currents affecting it. Theoretical studies were carried out in Matlab program, and practical studies were carried out using CassyLab device. The theoretical and practical results determined because of research are compared with each other.
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Belk, James, und Collin Bleak. „Some undecidability results for asynchronous transducers and the Brin-Thompson group $2V$“. Transactions of the American Mathematical Society 369, Nr. 5 (27.12.2016): 3157–72. http://dx.doi.org/10.1090/tran/6963.
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Boikhanov, Z. U. „DYNAMIC CHARACTERISTICS OF CONTROLLED OUTPUT VOLTAGE CONVERTERS“. Journal of Science and Innovative Development 5, Nr. 2 (29.04.2022): 133–39. http://dx.doi.org/10.36522/2181-9637-2022-2-14.
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This article uses a controlled output voltage-to-current converter to control the reactive power of an induction motor. The dynamic characteristics of the current converter were obtained using the Simulink program, taking into account reliability, sensitivity, measurement accuracy and error. Current converters are mainly operated during normal stable operation of the power supply system of an asynchronous motor. In this mode, when studying current transducers with certain conditional limits, the minimum and maximum values of the input current are accepted, for which the accuracy class (0.1‒1.2)∙Inom is set. Damage to electrical equipment and networks can lead to emergency operation of the power supply system of an asynchronous motor, in which case the current converters operate in dynamic mode. Short circuits in an asynchronous motor are the main reason for the operation of electromagnetic current converters in dynamic modes. The operating conditions of electromagnetic current adapters in such modes differ significantly from the operating conditions in the control system circuits. If electromagnetic current adapters are used for measurement purposes, they are usually required to operate at a primary current not exceeding the rated current and must perform their functions in the event of a fault.
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Pantalos, G. M., J. D. Marks, J. B. Riebman, N. A. Burton, R. Depaulis und W. J. Kolff. „Hemodynamic and Energetic Assessment of Calves Implanted with a Left Ventricular Assist Device (LVAD)“. International Journal of Artificial Organs 11, Nr. 2 (März 1988): 119–26. http://dx.doi.org/10.1177/039139888801100212.
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Hemodynamic and ventricular energetic parameters were measured in calves implanted with the air driven Utah Ventricular Assist Device (UVAD). Uptake site was varied to determine the effect of control mode and vacuum augmentation of filling. Uptake was drawn solely from the left atrium or combined with a left ventricular apical vent. LVAD outflow returned to the descending, thoracic aorta. Control modes examined included asynchronous pumping as well as 1:1 and 1:2 synchronous diastolic counterpulsation. The 85cc LVAD, vacuum formed from PELLETHANE®, was implanted acutely in four animals and chronically in six (7, 49 and 116 days paracorporeally, 1, 28 and 32 days intrathoracically). Instantaneous blood pressures, intramyocardial pressure, aortic outflow, oxygen consumption, LVAD output and drive parameters were recorded. LVAD output was independent of control mode when the natural heart rate was ≥ 80 beats per minute. Intrathoracically positioned LVADs pumped a mean flow of ≈5 liters/min without vacuum augmentation of filling. Paracorporeally positioned LVADs pumped ≈3 liters/min mean flow without vacuum augmentation and up to ≈6 liters/min with 38 mm Hg of vacuum augmentation of filling. Instantaneous ascending aortic pressure and flow showed distinct beat-to-beat variation depending on LVAD control mode. Lower average ventricular afterload was observed when pumping the LVAD asynchronously or 1:2 synchronously. In one acute preparation, left ventricular myocardial oxygen consumption was reduced from the unassisted average control level by 37% for the asynchronous and 1:1 synchronous control modes with left atrial uptake. With combined uptake, oxygen consumption was reduced an additional 30% during asynchronous control or 11% during 1:1 synchronous control without any change in LVAD output. Endocardial/epicardial blood flow ratio was similar and ≥1.12 for all test conditions. Renal and brain blood flow was maintained, or slightly elevated during ventricular assistance. Intramyocardial pressures were monitored using Millar catheter tip transducers. In an acute preparation, left ventricular assistance reduced peak intramyocardial pressure. Changing from atrial to combined uptake cannulation further reduced peak intramyocardial pressure for asynchronous and 1:1 synchronous LVAD control. Reduced end-diastolic intramyocardial pressures were seen with all modes of LVAD control. These data demonstrate excellent UVAD pumping function and suggest that left ventricular assistance does not compromise endocardial blood flow while sustaining blood flow to other major organs. Regardless of the uptake site, asynchronous or 1:2 synchronous LVAD control may be clinically preferable for effective reduction of left ventricular myocardial oxygen consumption.
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Hans, Vinay, und Dr M. K. Bhaskar. „Comparative Studies between Phasor Measurement Units (Synchrophasors) & SCADA System“. International Journal for Research in Applied Science and Engineering Technology 11, Nr. 11 (30.11.2023): 754–58. http://dx.doi.org/10.22214/ijraset.2023.56614.
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bstract: The increasing demand of load without considerable increase in transmission resources has posed numerous constraints and challenges in the power system monitoring and performance. Modern power system grid monitoring tools use data from remote terminal units (RTUs), protective relays, and transducers to provide information to system operators. This information is vital for the operation of the power system on a daily basis and under system contingencies. However, the method presently available to retrieve data from the devices is asynchronous and relatively slow. The asynchronous nature of the data does not provide accurate angle difference information from two nodes on the network. Moreover, the low data rate may be too slow to capture many short-duration disturbances on the grid. Alternatively, Synchrophasors based technology can be used to provide high-speed and coherent real-time information of the power system that is not available from legacy supervisory control and data acquisition (SCADA) systems.
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Khastsaev, Boris D., und Dmitry V. Merkushev. „Application of impedance method for research the dynamics of asynchronous motors“. MATEC Web of Conferences 226 (2018): 04013. http://dx.doi.org/10.1051/matecconf/201822604013.
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One of the possible fields of application of the impedance method based on the use of impedance and its components as an informative parameter is considered. This area of work is the study and diagnosis of asynchronous motors in dynamic mode. The paper presents both a T – shaped scheme of replacement of an asynchronous motor and one of its possible mathematical models, on the basis of which conclusions were made about the feasibility of applying the impedance method for the study and diagnosis of asynchronous motors and the need to develop hardware for this method. In this regard, the main part of the work is devoted to the consideration of measuring transducers necessary for both the technical implementation of the method as a whole, and the instrument support of the method. The option to build transmitters that use the basis four-armmeasuring bridge circuit known as a Wheatstone bridge. The first сonverter is easier to implement because it is implemented on the basis of the Whitstonbridge with one feedback, but is characterized by less functionality. The second converter is implemented more difficult, as it is also implemented on the basis of the Whitstonbridge, but with two feedbacks. However, this version of the converter has more functionality.
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Siddikov, Ilkhomjon Khakimovich, Dilyorbek Karimjonov Doniyorbek o'g'li und Abdumutal Abdikarimovich Abdigapirov. „RESEARCH OF THREE-PHASES CURRENT’S TRANSDUCERS OF FILTER-COMPENSATION DEVICES FOR CONTROL REACTIVE POWER’S CONSUMPTION OF ASYNCHRONOUS MOTOR“. Chemical Technology, Control and Management 2023, Nr. 1 (28.02.2023): 35–45. http://dx.doi.org/10.59048/2181-1105.1423.
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Margielewicz, Jerzy, Damian Gąska, Grzegorz Litak, Piotr Wolszczak und Shengxi Zhou. „Energy Harvesting in a System with a Two-Stage Flexible Cantilever Beam“. Sensors 22, Nr. 19 (28.09.2022): 7399. http://dx.doi.org/10.3390/s22197399.
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The subject of the research contained in this paper is a new design solution for an energy harvesting system resulting from the combination of a quasi-zero-stiffness energy harvester and a two-stage flexible cantilever beam. Numerical tests were divided into two main parts-analysis of the dynamics of the system due to periodic, quasiperiodic, and chaotic solutions and the efficiency of energy generation. The results of numerical simulations were limited to zero initial conditions as they are the natural position of the static equilibrium. The article compares the energy efficiency for the selected range of the dimensionless excitation frequency. For this purpose, three cases of piezoelectric mounting were analyzed-only on the first stage of the beam, on the second and both stages. The analysis has been carried out with the use of diagrams showing difference of the effective values of the voltage induced on the piezoelectric electrodes. The results indicate that for effective energy harvesting, it is advisable to attach piezoelectric energy transducers to each step of the beam despite possible asynchronous vibrations.
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Klyuyev, О., A. Sadovoi und Y. Sokhina. „CONSTRUCTION OF ROTOR ANGLE IDENTIFIER IN VECTOR CONTROL SYSTEMS OF DOUBLE FEED MACHINES“. Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 2, Nr. 39 (21.12.2021): 74–81. http://dx.doi.org/10.31319/2519-2884.39.2021.9.
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In asynchronous electric drives with vector control on the rotor, it is necessary to calculate the value of the sine and cosine of the angle of rotation of the rotor relative to the stator to form control actions. When using angle sensors, complex structural tasks can arise — placement and reliable mounting of the sensor on the shaft and, accordingly, the task of the overall layout of the unit. For high-power machines, the tasks of developing and creating the design of the sensor itself arise. If serial rotor angular position sensors can be used, the task of placing and mounting the sensor is no less difficult. In these cases it is necessary to deduce the second end of a shaft from the case of the engine with contact rings that complicates its design. Therefore, the urgent need to create more reliable electric drives with vector control systems on the rotor is the synthesis of identifiers of the angle of rotation of the rotor.
Identifiers are known whose calculation algorithms are based on determining the projections of the flow coupling vectors. In the work with the use of coordinate transducers of projections of stator or rotor current vectors and equations of electromagnetic circuits of an asynchronous machine, the synthesis and subsequent analysis of the properties of the rotor position angle identifier in vector control systems of dual power machines is performed. New equations of the identifier of flux couplings are received, its stability is investigated and on conditions of stability types of electric drives in which it is possible to apply the offered identifier are defined. The stability of the vector control system and sufficient identification accuracy when using the proposed equations and functions are confirmed by the method of mathematical modeling of the recommended electric drive systems in different operating modes.
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McDonnall, Daniel, Gregory A. Clark und Richard A. Normann. „Selective motor unit recruitment via intrafascicular multielectrode stimulation“. Canadian Journal of Physiology and Pharmacology 82, Nr. 8-9 (01.07.2004): 599–609. http://dx.doi.org/10.1139/y04-047.
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Recruitment of force via independent asynchronous firing of large numbers of motor units produces the grace and endurance of physiological motion. We have investigated the possibility of reproducing this physiological recruitment strategy by determining the selectivity of access to large numbers of independent motor units through intrafascicular multielectrode stimulation (IFMS) of the peripheral nerve. A Utah Slanted Electrode Array containing 100, 0.5–1.5 mm-long penetrating electrodes was inserted into the sciatic nerve of a cat, and forces generated by the 3 heads of triceps surea in response to electrical stimulation of the nerve were monitored via force transducers attached to their tendons. We found a mean of 17.4 ± 4.9 (mean ± SEM) electrodes selectively excited maximal forces in medial gastrocnemius before exciting another muscle. Among electrodes demonstrating selectivity at threshold, a mean of 7.3 ± 2.7 electrodes were shown to recruit independent populations of motor units innervating medial gastrocnemius (overlap < 20%). Corresponding numbers of electrodes were reported for lateral gastrocnemius and soleus, as well. We used these stimulation data to emulate physiological recruitment strategies, and found that independent motor unit pool recruitment approximates physiological activation more closely than does intensity-based recruitment or frequency-based recruitment.Key words: functional neuromuscular stimulation (FNS), microelectrode array, neuroprosthesis, intrafascicular multielectrode stimulation (IFMS).
Dissertationen zum Thema "Asynchronous Transducers"
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Exibard, Léo. „Automatic synthesis of systems with data“. Electronic Thesis or Diss., Aix-Marseille, 2021. http://www.theses.fr/2021AIXM0312.
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Nous interagissons régulièrement avec des machines qui réagissent en temps réel à nos actions (robots, sites web etc). Celles-ci sont modélisées par des systèmes réactifs, caractérisés par une interaction constante avec leur environnement. L'objectif de la synthèse réactive est de générer automatiquement un tel système à partir de la description de son comportement afin de remplacer la phase de développement bas-niveau, sujette aux erreurs, par l'élaboration d'une spécification haut-niveau.Classiquement, on suppose que les signaux d'entrée de la machine sont en nombre fini. Un tel cadre échoue à modéliser les systèmes qui traitent des données issues d'un ensemble infini (un identifiant unique, la valeur d'un capteur, etc). Cette thèse se propose d'étendre la synthèse réactive au cas des mots de données. Nous étudions un modèle adapté à ce cadre plus général, et examinons la faisabilité des problèmes de synthèse associés. Nous explorons également les systèmes non réactifs, où l'on n'impose pas à la machine de réagir en temps réelWe often interact with machines that react in real time to our actions (robots, websites etc). They are modelled as reactive systems, that continuously interact with their environment. The goal of reactive synthesis is to automatically generate a system from the specification of its behaviour so as to replace the error-prone low-level development phase by a high-level specification design.In the classical setting, the set of signals available to the machine is assumed to be finite. However, this assumption is not realistic to model systems which process data from a possibly infinite set (e.g. a client id, a sensor value, etc.). The goal of this thesis is to extend reactive synthesis to the case of data words. We study a model that is well-suited for this more general setting, and examine the feasibility of its synthesis problem(s). We also explore the case of non-reactive systems, where the machine does not have to react immediately to its inputs
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Shu, Han Ph D. Massachusetts Institute of Technology. „Multi-tape finite-state transducer for asynchronous multi-stream pattern recognition with application to speech“. Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37880.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.Includes bibliographical references (p. 119-127).
In this thesis, we have focused on improving the acoustic modeling of speech recognition systems to increase the overall recognition performance. We formulate a novel multi-stream speech recognition framework using multi-tape finite-state transducers (FSTs). The multi-dimensional input labels of the multi-tape FST transitions specify the acoustic models to be used for the individual feature streams. An additional auxiliary field is used to model the degree of asynchrony among the feature streams. The individual feature streams can be linear sequences such as fixed-frame-rate features in traditional hidden Markov model (HMM) systems, and the feature streams can also be directed acyclic graphs such as segment features in segment-based systems. In a single-tape mode, this multi-stream framework also unifies the frame-based HMM and the segment-based approach. Systems using the multi-stream speech recognition framework were evaluated on an audio-only and an audio-visual speech recognition task. On the Wall Street Journal speech recognition task, the multi-stream framework combined a traditional frame-based HMM with segment-based landmark features.
(cont.) The system achieved word error rate (WER) of 8.0%, improved from both the WER of 8.8% of the baseline HMM-only system and the WER of 10.4% of the landmark-only system. On the AV-TIMIT audio-visual speech recognition task, the multi-stream framework combined a landmark model, a segment model, and a visual HMM. The system achieved a WER of 0.9%, which also improved from the baseline systems. These results demonstrate the feasibility and versatility of the multi-stream speech recognition framework.
by Han Shu.
Ph.D.
Buchteile zum Thema "Asynchronous Transducers"
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Chalupa, Marek, und Thomas A. Henzinger. „Monitoring Hyperproperties with Prefix Transducers“. In Runtime Verification, 168–90. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-44267-4_9.
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AbstractHyperproperties are properties that relate multiple execution traces. Previous work on monitoring hyperproperties focused on synchronous hyperproperties, usually specified in HyperLTL. When monitoring synchronous hyperproperties, all traces are assumed to proceed at the same speed. We introduce (multi-trace) prefix transducers and show how to use them for monitoring synchronous as well as, for the first time, asynchronous hyperproperties. Prefix transducers map multiple input traces into one or more output traces by incrementally matching prefixes of the input traces against expressions similar to regular expressions. The prefixes of different traces which are consumed by a single matching step of the monitor may have different lengths. The deterministic and executable nature of prefix transducers makes them more suitable as an intermediate formalism for runtime verification than logical specifications, which tend to be highly non-deterministic, especially in the case of asynchronous hyperproperties. We report on a set of experiments about monitoring asynchronous version of observational determinism.
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Jiang, Chao, Wencai Liu, Youwei Liu und Xinjun Wu. „A Signal Processing Method for Steel Plate Thickness Measurement Using EMATs“. In Studies in Applied Electromagnetics and Mechanics. IOS Press, 2020. http://dx.doi.org/10.3233/saem200034.
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The time-of-flight (TOF) of the electromagnetic acoustic transducer (EMAT) echo signal can be used to measure the steel plate thickness. There are two ways to obtain the TOF, which are measure the peak to peak time in the time domain and calculate the echo frequency in the frequency domain. In this paper, a simplified signal model is proposed based on the analysis of received signals. Further, the relationship between the echo signal and excitation signal is considered. The echo signal is separated when the asynchronous demodulation method is applied to the received signal, and the thickness of steel plate can be calculated according to the peak spectral frequency in the low frequency band. The simplified model and signal processing method are verified by the experiment, and the results show that the model is reasonable and the accuracy of the signal processing method is high.
Konferenzberichte zum Thema "Asynchronous Transducers"
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Chen, Zhensheng, Jiahao Yu, Haozhe Zeng, Kai Tao, Zixuan Wu, Jin Wu, Weizheng Yuan und Honglong Chang. „Multi-Arched Asynchronous Triboelectric Sensor Based on Ultra-Stretchable Hydrogel for a Novel Displacement Measuring Mechanism“. In 2021 21st International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers). IEEE, 2021. http://dx.doi.org/10.1109/transducers50396.2021.9495542.
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Jeyaraman, Sankarkumar, Kirubakaran Purushothaman, Ramaraja Bhat und Kishore Prasad Deshkulkarni. „Flutter Alleviation by Aeroelastic Tailoring of a Transonic Rotor Blade“. In ASME 2017 Gas Turbine India Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gtindia2017-4662.
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High asynchronous self-excited blade response was observed in a transonic first stage rotor during the evaluation of flutter stability in high forward speed conditions. This candidate baseline rotor stage is a highly loaded, snubber-less bladed-disc configuration mounted in an axial low pressure compressor with tip speed in the order of 400 m/s. During the tests, the high asynchronous blade response was measured by strain gages, tip timing system and unsteady blade pressure transducers, which were correlated with analytical predictions. To alleviate this problem, it was attempted to tailor the first rotor blade configuration alone by adhering to all the constraints such as geometric, aerodynamic matching, material selection and utilising the same dovetail root configuration in the existing disc configuration. While tailoring the rotor blade, the critical blade parameters such as axial chord, thickness to chord, stagger, camber, leading and trailing edge radius were iterated from hub to tip. In the tailored rotor blade, the first flexure mode frequency, 1F was improved by 45% whereas the separation between second flexure, 2F and torsion mode, 1T were improved by over 30% with 4.9% weight penalty. Using the one way fluid-structure interaction approach, the blade incidence variation for different inlet pressure conditions and aerodynamic damping were evaluated using energy method for both the configuration. Blade sets of the tailored configuration were manufactured and tested in a dedicated compressor test facility, where characteristics were generated from 70% to 100% corrected speeds. The rig tests confirmed the predicted compressor performance as well as the improvement of natural frequency using blade mounted strain gages for the tailored blade. Upon the verification in the test rig, the tailored rotor configuration was further fitted in the engine and tested up to 103.3% of its design speed. The blade experienced two different inlet total pressure conditions in the test rig and engine tests. The unsteady pressure transducers and blade tip timing sensors did not show any asynchronous response in the corrected speed range for the tailored configuration. Compared to the baseline rotor blade, this tailored rotor blade demonstrated the absence of asynchronous response in the fundamental flexure mode and also well correlated with the aerodynamic damping prediction by energy method. Using this correlation, it is further analytically demonstrated that the blade will have sufficient aerodynamic damping at higher forward speeds and also minimal incidence variation in these conditions.
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Yoder, Valerie J., Steven W. Havens, Arthur J. Na und Rachel E. Weingrad. „Sensor Fusion for Industrial Applications Using Transducer Markup Language“. In ASME 2006 International Manufacturing Science and Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/msec2006-21116.
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Manufacturing processes would greatly benefit from fusing data from many disparate sensors, but systems today do not fully exploit available sensor data. Disparate sensors could include Coordinate Measurement Machines (CMM), laser surface scanners, micro sensors, cameras, acoustic devices, thermocouples, or other various devices which provide measurement or visual data. Often, sensor data requires separate customized software for each type of sensor system, as opposed to having common tools for use across a wide array of sensor systems. This process of stove-piping requires proprietary software for analysis and display of each sensor type, and inhibits interoperability. There are several challenges to sensor fusion which need to be addressed. First, many sensors providing data are heterogeneous in phenomena detection and operation, providing measurements of different target attributes. This makes the measurements very difficult to fuse directly. Second, these disparate sensors are asynchronous in time. The collection, integration, buffering and transmitting time can each affect the way time is calculated and stored by the sensor. Transducer Markup Language (TML), developed by IRIS Corporation, addresses these challenges. This paper describes TML and addresses examples of industrial applications of TML-enabled transducer networks.