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Journal articles on the topic 'Electrodynamic transducers'

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Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

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1

Kordonskii, V. I., S. A. Demchuk, V. A. Kuz'min, and �. A. Zal'tsgendler. "Heat transfer in electrodynamic transducers." Journal of Engineering Physics 59, no. 6 (December 1990): 1499–504. http://dx.doi.org/10.1007/bf00870404.

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2

Volkov, Denys, Artem Zubkov, and Vitalii Didkovskyi. "Genetic algorithm application for electrodynamic transducer model identification." ScienceRise, no. 4 (August 31, 2021): 48–57. http://dx.doi.org/10.21303/2313-8416.2021.002008.

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Research object: the adaptation and application of the genetic algorithm for electrodynamic transducer model parameters identification. Investigated problem: to formulate loudspeaker identification task as an optimization problem, adapt it to the genetic algorithm framework and compare obtained results with classical identification method using added mass. Main scientific results: the complete genetic algorithm loudspeaker identification procedure is presented, including: – data acquisition scheme, where the directly measured values for the algorithm application are: voltage at loudspeaker terminals, current through the voice coil and displacement of the moving part – selection of an appropriate set of genes of an individual – derivation of the fitness function for assessing the quality of the identified parameters, which can also be used to identify other types of electroacoustic transducers Also, the advantages of this method in comparison with the classical method of identification using added mass are considered, that are its versatility and ability to quickly configure and adapt for research and experimentation with different loudspeaker models and different types of transducers used in acoustics. Area of practical use of the research results: the proposed genetic loudspeaker model identification scheme can be directly applied on practice to speed up research and development tasks in electroacoustics and other related fields that require frequent experimentation with different types of transducer models. Innovative technological product: genetic algorithm based loudspeaker identification scheme that can be applied to identify various model of electrodynamic transducers. Scope of application of the innovative technological product: electroacoustics, loudspeaker design, audio systems

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3

Cheng, Shuo, and David P. Arnold. "Defining the coupling coefficient for electrodynamic transducers." Journal of the Acoustical Society of America 134, no. 5 (November 2013): 3561–72. http://dx.doi.org/10.1121/1.4824347.

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4

Jafari-Shapoorabadi, R., A. Konrad, and A. N. Sinclair. "The governing electrodynamic equations of electromagnetic acoustic transducers." Journal of Applied Physics 97, no. 10 (May 15, 2005): 10E102. http://dx.doi.org/10.1063/1.1851393.

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5

Eriksson, Tobias, Michael Laws, Lei Kang, Yichao Fan, Sivaram Ramadas, and Steve Dixon. "Experimental Evaluation of Three Designs of Electrodynamic Flexural Transducers." Sensors 16, no. 9 (August 25, 2016): 1363. http://dx.doi.org/10.3390/s16091363.

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6

Irrgang, Stefan, and Wolfgang Klippel. "Nonlinear adaptive controller for electrodynamic transducers without additional sensor." Journal of the Acoustical Society of America 105, no. 2 (February 1999): 972. http://dx.doi.org/10.1121/1.425318.

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7

Brunelli, B., D. Casadei, G. Serra, and A. Tani. "Active damping control for electrodynamic suspension systems without mechanical transducers." IEEE Transactions on Magnetics 32, no. 5 (1996): 5055–57. http://dx.doi.org/10.1109/20.539488.

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8

Xie, C. G., A. L. Stott, S. M. Huang, A. Plaskowski, and M. S. Beck. "Mass-flow measurement of solids using electrodynamic and capacitance transducers." Journal of Physics E: Scientific Instruments 22, no. 9 (September 1989): 712–19. http://dx.doi.org/10.1088/0022-3735/22/9/007.

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9

Kordík, Jozef, and Zdeněk Trávníček. "Non-harmonic excitation of synthetic jet actuators based on electrodynamic transducers." International Journal of Heat and Fluid Flow 73 (October 2018): 154–62. http://dx.doi.org/10.1016/j.ijheatfluidflow.2018.07.003.

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10

Medina, Nieves, Jesús De Vicente, and Jorge Robles. "Magnetic fields influence on sensors with electrical output under sinusoidal excitations." ACTA IMEKO 5, no. 1 (April 29, 2016): 51. http://dx.doi.org/10.21014/acta_imeko.v5i1.301.

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This paper describes the magnetic effects studied at CEM in their realization of a primary standard for dynamic force calibration using sinusoidal excitations of force transducers, although they can also affect any sensor with an electrical output mounted on an electrodynamic shaker. In this study the electromagnetic behaviour for the interaction between sensor and shaker or a similar source of magnetic fields is explained and a solution to minimise this interaction is also included.

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11

Kordík, Jozef, and Zdeněk Trávníček. "Optimal diameter of nozzles of synthetic jet actuators based on electrodynamic transducers." Experimental Thermal and Fluid Science 86 (September 2017): 281–94. http://dx.doi.org/10.1016/j.expthermflusci.2017.03.010.

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12

Pakhomov, M. "Investigation of Influence of Electromechanical Characteristics of Electrodynamic Transducers on Sound Quality Perception." Proceedings of Telecommunication Universities 5, no. 1 (2019): 31–40. http://dx.doi.org/10.31854/1813-324x-2019-5-1-31-40.

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13

Kordík, Jozef, Zdeněk Trávníček, and Miroslav Pavelka. "Energetic efficiencies of synthetic and hybrid synthetic jet actuators driven by electrodynamic transducers." Experimental Thermal and Fluid Science 69 (December 2015): 119–26. http://dx.doi.org/10.1016/j.expthermflusci.2015.08.005.

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14

Graf, C., and J. Maas. "A model of the electrodynamic field distribution for optimized electrode design for dielectric electroactive polymer transducers." Smart Materials and Structures 21, no. 9 (August 31, 2012): 094001. http://dx.doi.org/10.1088/0964-1726/21/9/094001.

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15

Rendon-Hernandez, Adrian A., Spencer E. Smith, Miah A. Halim, and David P. Arnold. "Hybrid Piezo/Magnetic Electromechanical Transformer." Micromachines 12, no. 10 (October 5, 2021): 1214. http://dx.doi.org/10.3390/mi12101214.

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This paper presents a hybrid electromechanical transformer that passively transfers electrical power between galvanically isolated ports by coupling electrodynamic and piezoelectric transducers. The use of these two complementary electromechanical transduction methods along with a high-Q mechanical resonance affords very large transformations of voltage, current, or impedance at particular electrical frequencies. A chip-size prototype is designed, simulated, fabricated, and experimentally characterized. The 7.6 mm × 7.6 mm × 1.65 mm device achieves an open-circuit voltage gain of 31.4 and 48.7 when operating as a step-up transformer at 729.5 Hz and 1015 Hz resonance frequencies, respectively. When operating as a step-down transformer, the resonance frequencies and the corresponding voltage gains are 728 Hz, 1002 Hz, and 0.0097, 0.0128, respectively. In one operational mode, the system shows a minimum power dissipation of only 0.9 µW corresponding to a power conversion efficiency of 11.8%.

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16

Płaczek, Marek, Andrzej Wróbel, and Andrzej Buchacz. "Structural Tests of Freight Wagons on the Basis of Signals Generated By Piezoelectric Macro Fiber Composites." Acta Mechanica et Automatica 11, no. 3 (September 1, 2017): 210–16. http://dx.doi.org/10.1515/ama-2017-0032.

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AbstractPaper presents a report of a research work that concerns possibilities of freight wagons modernization using new composite materials. The main aim of presented work was to verify the possibility of inference from the dynamic response of the wagon about the changes in its technical condition. During the presented works tests on real objects were carried out using Macro Fiber Composite (MFC) piezoelectric transducers glued to the freight wagon’s frame. The dynamical response of the wagon was measured while the object was driving. On the next stage the measured signal was generated on a laboratory stand using electrodynamic modal shaker and vibrations of the laboratory model were measured. Measured signals were juxtaposed on charts and analysed. The aim of this work was to verify if it is possible to detect the change in the system using measurements of vibrations that are being generated during exploitation of the freight wagon.

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17

Erza, Mehran, Etienne Gaviot, Guy Lemarquand, Pascal Tournier, Lionel Camberlein, Stephane Durand, and Frederic Polet. "A Versatile Model of Nonlinear Electrodynamic Loudspeaker Co-Operating with the Amplifier Designed by Way of Advanced Software." Archives of Acoustics 39, no. 1 (March 1, 2015): 51–63. http://dx.doi.org/10.2478/aoa-2014-0006.

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Abstract Sound processing with loudspeaker driving depends critically on high quality electroacoustic transducers together with their relevant amplifiers. In this paper, the nonlinear effects of electrodynamic loudspeakers are investigated as regard the influence of the changes of their main descriptive parameters values. Indeed, while being operated nonlinear effects observed with loudspeakers are due to changes of such constitutive parameters. Regarding either current or voltage-drive, an original model based on Simulink R is presented, taking account of all the electrical and mechanical properties closely associated with nonlinear behaviours. Moreover, as such a Simulink R model may be combined with the PSpice R advanced software, the behaviour of both loudspeaker and amplifier can be exhaustively investigated and optimized. To this end, the amplifier is simulated thanks to the Orcad-Capture-PSpiceR software prior to match with the loudspeaker model with the so-called SLPS co-simulator. Then, values of the current flowing through the loudspeaker can be determined and plotted considering voltage controlling. Obviously in this case current-drive has not to be assessed. This way to proceed allows us to highlight any critical information especially due to the voice coil displacement, yielded velocity, and acceleration of the diaphragm. Indeed our approach testifies to the imperative necessity of mechanical measurements together with electrical ones. Then, considering a given amplifier-loudspeaker association with specific parameters changes of the latter, the entailed nonlinear distortion allows us to qualify and criticize the whole design. Such an original approach should be most valuable so as to match the best fitted amplifier with a given electrodynamic loudspeaker. Then non linear effects due to voltage and current-drive are compared highlighting the advantages of an apt currentcontroled policy.

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18

Hoffmann, Patrick. "Electrodynamic acoustic transducer." Journal of the Acoustical Society of America 126, no. 3 (2009): 1635. http://dx.doi.org/10.1121/1.3230435.

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19

Schutter, E., and V. Gorelik. "Electrodynamic acoustic transducer." Journal of the Acoustical Society of America 102, no. 5 (1997): 2474. http://dx.doi.org/10.1121/1.420413.

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20

Grau, Noel J. "Minimal inductance electrodynamic transducer." Journal of the Acoustical Society of America 100, no. 5 (1996): 2897. http://dx.doi.org/10.1121/1.417181.

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21

Graff, Alfred. "Modifiable electrodynamic ultrasonic transducer." Journal of the Acoustical Society of America 100, no. 6 (1996): 3481. http://dx.doi.org/10.1121/1.417264.

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22

Pavlovic, Dino. "Diaphragm for electrodynamic transducer." Journal of the Acoustical Society of America 96, no. 3 (September 1994): 1943. http://dx.doi.org/10.1121/1.410223.

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23

Graff, A., and H. Rohde. "Electrodynamic permanent magnet transducer." Journal of the Acoustical Society of America 98, no. 3 (September 1995): 1258. http://dx.doi.org/10.1121/1.413479.

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24

Hansen, Kaj B. "Electrodynamic transducer including inset." Journal of the Acoustical Society of America 96, no. 4 (October 1994): 2617–18. http://dx.doi.org/10.1121/1.410088.

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25

Grau, Noel J. "Minimal inductance electrodynamic transducer." Journal of the Acoustical Society of America 98, no. 1 (July 1995): 24. http://dx.doi.org/10.1121/1.413772.

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26

Noselli, Guido. "Moving‐coil electrodynamic electroacoustic transducer." Journal of the Acoustical Society of America 97, no. 5 (May 1995): 3216. http://dx.doi.org/10.1121/1.411843.

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27

В. Г. Савин, Н. И. Штефан, and А. А. Бабаев. "EXPERIMENTAL INVESTIGATIONS OF ACOUSTIC RADIATION PULSES CYLINDRICAL PIEZOELECTRIC TRANSDUCERS LOCATED IN A LIQUID." MECHANICS OF GYROSCOPIC SYSTEMS, no. 26 (December 23, 2013): 68–74. http://dx.doi.org/10.20535/0203-377126201330675.

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Discusses issues related to the comparison of the experimental and theoretical results , that is, of acoustic pulses cylindrical piezoelectric transducers that are in the liquid.Electrical block diagram of the measuring system is the base for conducting such research. When this converter is excited at a resonant frequency.Analyzing the experimental and theoretical results, it should be noted that the formulation of the problem was carried out in an analytical form. Formulation and solution of the problem allow us to find the physical characteristics of the studied transition.Based on a comparison of experimental and theoretical work in the conclusion of the applicability of the results in practice, the proposed mathematical models of cylindrical piezoelectric transducers (thin electroelastic bodies), based on the linear theory of electrodynamics and of the Kirchhoff – Love in the time-dependent problems in calculating hydro acoustic transducers.Experimental studies were carried out for commercially available cylindrical transducer brand TSTBS – 3 is in the liquid, and the considered regimes of pulsed electrical excitation are working for most of sonar systems. Tests have shown that the actual design features of the considered cylindrical transducer little effect on the configuration of the acoustic pulses of radiation in different directions. Applied mathematical models of thin electroelastic bodies are recommended for use in the design practice in the design of sonar technology for various purposes.The study of the transition process is relevant for the decision of problems like these.

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28

ESSAMBA MAH, URSULE, and PAUL WOAFO. "NUMERICAL SIMULATION OF AN ELECTRODYNAMIC TRANSDUCER CONTROL OF INSULIN PROVISION IN THE BERGMAN’S AND THE CHENG’S MODELS FOR THE DYNAMICS OF THE COUPLE GLUCOSE-INSULIN IN DIABETICS." Journal of Mechanics in Medicine and Biology 20, no. 08 (October 2020): 2050055. http://dx.doi.org/10.1142/s0219519420500554.

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This paper deals with the numerical simulation of a model of blood glucose level control of a diabetic person using an electrodynamic transducer. Two mathematical models describing the dynamics of the couple glucose–insulin are used: the Bergman’s and the Cheng’s models. First, the adaptive control is applied on the dynamics of a reservoir opener by an electrodynamic transducer. Then it is applied on the two models of the glucose–insulin dynamics. It is found that the control of the reservoir opener and that of the glycemia of a diabetic patient are efficient for some values of the control parameters.

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29

Nieuwendijk, Joris A. M., and Georgius B. J. Sanders. "Electrodynamic transducer comprising a two‐part diaphragm." Journal of the Acoustical Society of America 87, no. 2 (February 1990): 931. http://dx.doi.org/10.1121/1.398817.

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30

Bebenroth, Wolf-Dietrich. "Hearing aid with an electrodynamic acoustic transducer." Journal of the Acoustical Society of America 105, no. 2 (1999): 584. http://dx.doi.org/10.1121/1.426990.

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31

Pollet, Ferdinand, and Jean Julia. "Electrodynamic‐fluidic transducer element for pneumatic loudspeaker." Journal of the Acoustical Society of America 95, no. 6 (June 1994): 3683. http://dx.doi.org/10.1121/1.409908.

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32

Vedier, Paul. "FCS technology: A novel electrodynamic transducer architecture." Journal of the Acoustical Society of America 149, no. 4 (April 2021): A94—A95. http://dx.doi.org/10.1121/10.0004620.

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33

Collet, M., P. David, and M. Berthillier. "Active acoustical impedance using distributed electrodynamical transducers." Journal of the Acoustical Society of America 125, no. 2 (February 2009): 882–94. http://dx.doi.org/10.1121/1.3026329.

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34

Nieuwendijk, Joris A. M., Georgius B. J. Sanders, and Johannes W. T. Bax. "Electrodynamic transducer of the isophase or ribbon type." Journal of the Acoustical Society of America 84, no. 2 (August 1988): 805. http://dx.doi.org/10.1121/1.397224.

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35

Saxena, Prashant. "On the General Governing Equations of Electromagnetic Acoustic Transducers." Archive of Mechanical Engineering 60, no. 2 (June 1, 2013): 231–46. http://dx.doi.org/10.2478/meceng-2013-0015.

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In this paper, we present the general governing equations of electrodynamics and continuum mechanics that need to be considered while mathematically modelling the behaviour of electromagnetic acoustic transducers (EMATs). We consider the existence of finite deformations for soft materials and the possibility of electric currents, temperature gradients, and internal heat generation due to dissipation. Starting with Maxwell’s equations of electromagnetism and balance laws of nonlinear elasticity, we present the governing equations and boundary conditions in incremental form in order to solve wave propagation problems of boundary value type.

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36

Md Yunus, Mohd Amri, Mohd Taufiq Mohd Khairi, and Sallehuddin Ibrahim. "Narrow Band Vibration Measurement System With Electrodynamic Transducer Seismograph and Modeling Verification." IEEE Sensors Journal 20, no. 9 (May 1, 2020): 4768–77. http://dx.doi.org/10.1109/jsen.2020.2966771.

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37

Zekhtser, M. Yu, A. S. Revyakin, and D. A. Sarychev. "Self-adjusting control system of the electrodynamic velocity transducer for Mössbauer spectrometer." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 381 (August 2016): 45–51. http://dx.doi.org/10.1016/j.nimb.2016.05.019.

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38

Rahmat, M. F., N. S. Kamaruddin, and M. D. Isa. "FLOW REGIME IDENTIFICATION IN PNEUMATIC CONVEYOR USING ELECTRODYNAMIC TRANSDUCER AND FUZZY LOGIC METHOD." International Journal on Smart Sensing and Intelligent Systems 2, no. 3 (2009): 396–416. http://dx.doi.org/10.21307/ijssis-2017-357.

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39

Broel-Plater, Bogdan, Stefan Domek, and Arkadiusz Parus. "Permanent Magnet Chatter Absorber with Fuzzy Logic Control." Solid State Phenomena 147-149 (January 2009): 290–95. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.290.

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The paper deals with semi-active chatter absorber based on an electrodynamic transducer built around high-energy permanent magnets. Also, a fuzzy logic control system for the absorber control system has been designed. The principal advantage of fuzzy control is the possibility to implement practical experience gained by machine operators in the control algorithm. Hence, the possibility of factoring such quantities, as vibrations experienced by selected points of the machine-tool, and sound emitted by working machine into the analyzed chatter absorber fuzzy control system has been studied in the paper. The control system has been tested by way of simulation with the use of the process and cutting force models.

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40

Lobanov, L. M., I. P. Kondratenko, V. M. Mikhalskyi, M. O. Pashchin, O. M. Karlov, V. V. Chopyk, and O. L. Mykhodui. "ELECTROTECHNICAL COMPLEX FOR ELECTRODYNAMIC PROCESSING OF WELDED JOINTS." Tekhnichna Elektrodynamika 2020, no. 6 (October 21, 2020): 61–68. http://dx.doi.org/10.15407/techned2020.06.061.

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The composition of a two-channel switching power supply for electrodynamic processing of welded joints is determined, which consists in simultaneous action on a limited area of the electric current seam and compressive force of the electrode of such values that the electroplastic effect becomes possible. A linear electromechanical induction transducer is used to create the force pressure. The duration of the compressive phase of the power pulse is chosen to be longer than the duration of the current pulse, which reduces the probability of rupture of the electrical circuit and the release of thermal energy. By controlled delay of the beginning of the current pulse, synchronization of both factors of the electroplastic effect is achieved. The parallel inclusion of semiconductor devices that switch the discharge circuit alternately is proposed, which in the conditions of operation of electrical equipment with a pulse frequency of up to 10 Hz reduces the heat load. Experimental studies have shown a twofold increase in the number of cycles before the destruction of the samples with symmetrical bending. Comparison of two-channel and single-channel electrodynamic processing revealed a twofold reduction in power consumption in a two-channel device. References 8, figures 3, table 1.

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41

Massa, Donald P., and Juan I. Arvelo. "A wideband moving coil electrodynamic transducer system for autonomous underwater vehicle-based geoacoustic inversion." Journal of the Acoustical Society of America 132, no. 3 (September 2012): 1920. http://dx.doi.org/10.1121/1.4755048.

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42

Gusev, A. V. "Detection of a classical signal with unknown parameters in quantum noise of an electrodynamic transducer." Quantum Electronics 27, no. 1 (January 31, 1997): 82–85. http://dx.doi.org/10.1070/qe1997v027n01abeh000814.

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43

Liu, Zhihua, Chenguang Cai, Ming Yang, and Mei Yu. "Development of a tri-axial primary vibration calibration system." ACTA IMEKO 8, no. 1 (March 31, 2019): 33. http://dx.doi.org/10.21014/acta_imeko.v8i1.662.

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A tri-axial primary vibration calibration system has been set up at National Institute of Metrology for simultaneous calibration of motion transducers. The system is driven by three electrodynamics exciters that are mounted along the three orthogonal axes. The cross-coupling unit based on air bearing is developed for force transferring and motion guiding. Spatial orbit vibration is composited from sine vibration components of the three orthogonal axes. Relationship of shapes and orientations of spatial orbits and amplitudes and phases of sine vibration components is discussed. Multi-exciter vibration control for both cross-coupling compensation and amplitudes and phases control of sine vibration components is investigated. The tri-axial measuring system can simultaneously measure the three orthogonal vibration quantities based on the band-pass sampling method. The experiments show that a variety of spatial orbits can be generated by efficiently reducing the cross-coupling of the tri-axial vibration exciter and the magnitude and the phase shift of sensitivities of a tri-axis accelerometer can be determined.

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44

Mundorf, Raimund. "MEMBRANE OR MEMBRANE CONFIGURATION FOR AN ELECTRODYNAMIC SOUND TRANSDUCER, AND LOUDSPEAKER COMPRISING SUCH A MEMBRANE OR MEMBRANE CONFIGURATION." Journal of the Acoustical Society of America 133, no. 3 (2013): 1841. http://dx.doi.org/10.1121/1.4795036.

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45

Guo, Qiushuang, and David A. Brown. "Improvements on the design of the electrodynamic transducer coils used in spectropic determination of acoustic constants of thin bars." Journal of the Acoustical Society of America 104, no. 3 (September 1998): 1790. http://dx.doi.org/10.1121/1.423519.

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46

Ashcheulov, Anatoly, Mykola Derevianchuk, and Dmytro Lavreniuk. "Anisotropic metadielectric converter." Electrical Engineering and Power Engineering, no. 4 (April 20, 2022): 18–27. http://dx.doi.org/10.15588/1607-6761-2021-4-2.

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Purpose. Investigation of the peculiarities of the electric field energy conversion by an anisotropic meta-medium with a negative value of the dielectric constant in one of the selected main crystallographic directions. Methodology. Research was carried out using methods of physical and mathematical modeling of anisotropic metadielectric converter; using methods to optimize the function of the dependence of the conversion factor m, anisotropic metadielectric converter, on the angle α between one of the crystallographic axes and the edge of the platinum a, at fixed anisotropy coefficients of metadielectric material. Findings. For the first time, the peculiarities of the electric field transformation by an anisotropic meta-medium with a negative value of the dielectric constant in one of the selected main crystallographic directions were studied. It is established that at the moment of application to the upper and lower faces of the anisotropic metadielectric plate, which is the basis of the anisotropic metadielectric converter, some potential difference leads to polarization of its volume and the emergence of both longitudinal and transverse components of the vortex electric field. This situation leads to axial folding of its internal field, which in turn causes the appearance of micro-vortices of the electric field, given by the expression , where - the circular time of rotation of the micro-vortex, and signs "+" and "-" - indicate the direction of its rotation. Such axial electric micro vortices are an efficient mechanism that pumps energy between the physical vacuum and, in our case, the anisotropic metadielectric plate of the transducer. The dependence of the transformation coefficient m of this medium on the value of anisotropy is analyzed. Studies have shown that in the interval the value of m is characterized by a negative value, and in the interval – positive, this allowed us to determine the areas of stable existence of different types of energy. The use of metadielectric material in comparison with the classical one is characterized by values of m>1. Note that in some cases there is an abnormal increase in the coefficient. Originality. Using the representations of vortex electrodynamics, the mechanism of energy interaction between the vortex electric field of an anisotropic metaenvironment and the physical vacuum is proposed. Practical value. A model of the original design of an anisotropic metadielectric converter is proposed. Areas of its practical use in the form of generators of electricity, heat and cold are determined, calculated expressions for their efficiency are in the range η = 0.5 ÷ 0.98, and the cooling temperature can reach the temperature of liquid helium.

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47

Klippel, Wolfgang. "Adaptive Stabilization of Electrodynamic Transducers." Journal of the Audio Engineering Society 63, no. 3 (March 16, 2015). http://dx.doi.org/10.17743/jaes.2015.0011.

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48

Zubkov, Artem Dmytrovych, Denys Dmytrovych Volkov, and Vitalii Semenovych Didkovkyi. "Investigation of the Possibility of Applying a Genetic Algorithm for Electroacoustics Problems." Microsystems, Electronics and Acoustics 26, no. 1 (April 29, 2021). http://dx.doi.org/10.20535/2523-4455.mea.227793.

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This paper considers the adaptation and application of a genetic algorithm to find the parameters of the electrodynamic transducer model. The advantages and disadvantages of this method in comparison with the classical method of identification using added mass are considered. The derivation of the suitability function for estimating the identified parameters is presented, which can also be used to identify other types of electroacoustic transducers. The theory underlying genetic algorithms has been examined and shown how genetic algorithms work by assembling the best solutions from small structural elements with excellent qualities. Next, the differences between genetic and traditional algorithms were analyzed, including population population support and the use of genetic representation of solutions. After that, the strengths of genetic algorithms were described, including the possibility of global optimization and applicability to problems with complex mathematical representation or without representation at all, and noise resistance. Disadvantages were also highlighted: the need for special definitions and settings of hyperparameters, the danger of premature convergence. In conclusion, the situations when the use of genetic algorithms are listed This algorithm is not tied to a specific engineering or scientific field, which makes it universal, it is equally used in genetics and computer science. The parameters were determined using a genetic algorithm and compared with the more classical method of added mass for acoustics. The comparative table in the work illustrates the high accuracy of the genetic algorithm in comparison with the method of added mass. During the work on the practical part, also to improve the behavior of the model at frequencies higher than the resonant, it was decided to complicate the model of the electrical subsystem of the tranducer and introduce additional parameters: parallel resistance and parallel inductance. As a result, the complicated model began to correspond better to the measured values in the entire frequency domain, and is therefore more accurate. This is an example of the convenience of using a genetic algorithm in the transition from identification of one model with specific parameters to another. The results of this work prove that the use of a genetic algorithm is appropriate for solving electroacoustic problems because its application allows to quickly experiment and identify more complex models for which the added mass method can not be applied. Also, in the future, genetic algorithm can be used to identify transducer models of in time domain, for example, nonlinear models of electrodynamic transducers or models in a state space, which is the subject of future research.This paper considers the adaptation and application of a genetic algorithm to find the parameters of the electrodynamic transducer model. The advantages and disadvantages of this method in comparison with the classical method of identification using added mass and the method of parameter selection BL are considered. The derivation of the fitness function for assessing the quality of the identified parameters is presented, which can also be used to identify other types of electroacoustic transducers. The directly measured values for the application of the algorithm are the voltage at the terminals of the converter, the current through the coil of the converter and the displacement of the moving part of the converter. The undoubted advantage of the genetic algorithm compared to classical identification methods is its versatility and the ability to quickly adapt and configure for research and experimentation with different models and different types of transducers used in acoustics. This article describes the adaptation and application of a genetic algorithm to find parameters of an electrodynamic transducer model. The advantages and disadvantages of this method in comparison with the classical identification method using added mass are considered. The derivation of the fitness function for assessing quality of the identified parameters is presented, which can also be used to identify other types of electroacoustic transducer models.

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Lundstrom, Troy, and Nader Jalili. "Effective Placement of a Cantilever Resonator on Flexible Primary Structure for Vibration Control Applications—Part 2: Model Updating and Experimental Validation." Journal of Vibration and Acoustics 140, no. 5 (April 17, 2018). http://dx.doi.org/10.1115/1.4039532.

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In this Part 2 of a two-part series, the experimental verification and comparison of this work are presented. In this paper, the effect of beam-type resonator position on flexible dynamics is determined experimentally. The system is excited using band-limited white noise via electrodynamic shaker, and the data are collected with several transducers and a high-speed camera for each actuator beam mounting location; the first four mode shapes and natural frequencies are determined, and a finite element model (FEM) is developed and updated using these data. An additional set of data is collected using a linear sine chirp forcing function and the updated/experimental frequency response functions (FRFs) and time responses for the base and actuator beam tips are found to correlate. Plots of experimentally determined percent modal strain energy versus attachment position for the first four modes is presented, and a final study is also performed showing the fractional root-mean-square (RMS) strain energy in the actuator with respect to the total system. A final set of data is collected in which the actuator beam is moved up the base beam, the piezoelectric patch of the actuator beam is energized with white noise, and the tip response of the base beam is measured; an RMS base beam velocity versus mount position plot was developed. From this work, it is determined that the most practical/optimal position for the secondary beam to serve as both a sensor and actuator to control base beam tip response over a wide frequency band is in the nondimensionalized range: 0.4≤e<0.6.

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Volkov, Denys, and Vitaliy Didkovskyi. "IDENTIFICATION OF THE ELECTRICAL IMPEDANCE OF AN IMMOBILIZED TRANSDUCER AND THE MECHANICAL IMPEDANCE OF AN ELECTRODYNAMIC LOUDSPEAKER USING AUTOMATIC FIT OF THE FORCE FACTOR BL." Akustika, VOLUME 42 (2022). http://dx.doi.org/10.36336/akustika20224223.

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This paper describes a method for determining mechanical and electrical impedances of an electrodynamic transducer based on the automatic brute-force search of the force factor Bl. Also, the way of identifying electrical apparent resistance and apparent inductance of the voice coil is shown as an example of deeper loudspeaker analysis that proposed method allows to achieve. The measured signals are voltage on speaker terminals, voice coil current and membrane displacement. Measuring displacement in addition to voltage and current allows to completely separate transducer mechanical subsystem from electrical and apply various known modeling approaches to them separately.

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