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Готові списки джерел за темами / Electromagnetic-acoustic method / Статті в журналах

Щоб переглянути інші типи публікацій з цієї теми, перейдіть за посиланням: Electromagnetic-acoustic method.

Статті в журналах з теми "Electromagnetic-acoustic method"

Автор: Grafiati

Опубліковано: 28 травня 2022

Оновлено: 31 липня 2025

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1

Cai, Zhichao, Hao Cheng, and Chengcheng Liu. "Nonlinear Electromagnetic Acoustic Testing Method for Tensile Damage Evaluation." Journal of Sensors 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/1745257.

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This paper describes an approach for measuring material plasticity using contactless electromagnetic acoustic method. Harmonic generation from noncumulative fundamental longitudinal wave in specimen is studied based on numerical method, and the contribution to harmonic generation from tensile damage is shown to be higher than that from a geometric factor; more serious damages increase the amplitude of second harmonics. These two experimental setups (nonlinear piezoelectric method and nonlinear electromagnetic acoustic method) are used to assess the relative nonlinearity parameters of tensile d

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2

Sathyan, Sabin, Ugur Aydin, and Anouar Belahcen. "Acoustic Noise Computation of Electrical Motors Using the Boundary Element Method." Energies 13, no. 1 (2020): 245. http://dx.doi.org/10.3390/en13010245.

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This paper presents a numerical method and computational results for acoustic noise of electromagnetic origin generated by an induction motor. The computation of noise incorporates three levels of numerical calculation steps, combining both the finite element method and boundary element method. The role of magnetic forces in the production of acoustic noise is established in the paper by showing the magneto-mechanical and vibro-acoustic pathway of energy. The conversion of electrical energy into acoustic energy in an electrical motor through electromagnetic, mechanical, or acoustic platforms i

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3

Oleynikov, A. N., V. A. Pulavskyi, and O. H. Bilotserkivets. "Ways to improve the efficiency of methods and means of counteracting unauthorized speech recording and their comparative analysis." Radiotekhnika, no. 212 (March 28, 2023): 85–89. http://dx.doi.org/10.30837/rt.2023.1.212.07.

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The features of using ultrasonic, electromagnetic and acoustic methods to counteract unauthorized recording of speech on sound recording devices are considered. The advantages and unused possibilities of the methods are noted. Ways to increase the effectiveness of the ultrasonic method of counteraction consist in using the two-frequency ultrasonic method, in positioning the device for emitting ultrasonic vibrations no more than two meters from the target, in using high-intensity ultrasonic vibrations, in using the ultrasonic method together with the acoustic method, and others. Ways to increas

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4

Komarov, V. A. "Electromagnetic-acoustic conversion—a method of nondestructive testing." Uspekhi Fizicheskih Nauk 150, no. 9 (1986): 164. http://dx.doi.org/10.3367/ufnr.0150.198609h.0164.

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5

Li, Qiuyue, Yushu Lai, and Difei Cao. "Investigating electromagnetic acoustic emission signals denoising for alloy materials non-destructive detecting: a CRQA method." Defektoskopiâ, no. 2 (May 23, 2024): 30–42. http://dx.doi.org/10.31857/s0130308224020039.

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Aiming at the problem that signals collected from local electromagnetic loading operations are usually mixed with background noises (especially white noise), this paper proposed an electromagnetic acoustic emission signal denoising technology based on cross recurrence quantification analysis (CRQA). Firstly, the decomposition layer and penalty factor of variational mode decomposition (VMD) are set by experience or optimization algorithm, and then the original signal is decomposed. Secondly, the main components are selected by the CRQA algorithm, and the electromagnetic acoustic emission signal

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6

Li, Qiuyue, Yushu Lai, and Difei Cao. "Investigating electromagnetic acoustic emission signals denoising for alloy materials non-destructive detecting: a CRQA method." Дефектоскопия, no. 2 (May 23, 2024): 30–42. http://dx.doi.org/10.31857/s0130308224020038.

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Анотація:

Aiming at the problem that signals collected from local electromagnetic loading operations are usually mixed with background noises (especially white noise), this paper proposed an electromagnetic acoustic emission signal denoising technology based on cross recurrence quantification analysis (CRQA). Firstly, the decomposition layer and penalty factor of variational mode decomposition (VMD) are set by experience or optimization algorithm, and then the original signal is decomposed. Secondly, the main components are selected by the CRQA algorithm, and the electromagnetic acoustic emission signal

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7

Dehui, Wu, Yang Jiaxin, Chen Wenxiong, and Wang Teng. "An electromagnetic acoustic transducer with electromagnetic pulse restraining." Insight - Non-Destructive Testing and Condition Monitoring 63, no. 2 (2021): 111–17. http://dx.doi.org/10.1784/insi.2021.63.2.111.

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Electromagnetic acoustic transducers (EMATs) are widely used in non-destructive testing (NDT). However, when ultrasonic waves are excited, the transmitting coil generates a strong alternating magnetic field, resulting in the generation of an electromagnetic pulse. To address this problem, an EMAT with electromagnetic pulse restraining is presented in this paper. First, the cause of the electromagnetic pulse is investigated. Second, the conditions for restraining the electromagnetic pulse using the new transmitting coil are analysed. Finally, the design method for the new transmitting coil is p

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8

Oleynikov, A. N., V. A. Pulavsky, and I. N. Chigirev. "Improving the efficiency of methods and means for suppressing unauthorized speech recording." Radiotekhnika, no. 209 (June 24, 2022): 156–61. http://dx.doi.org/10.30837/rt.2022.2.209.15.

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The article analyzes the effectiveness of suppressing an unauthorized recording using acoustic, electromagnetic and ultrasonic countermeasures. It is shown that acoustic, electromagnetic and ultrasonic counteraction without a priori knowledge of the type of voice recorder does not provide guaranteed suppression of unauthorized speech recording. To increase the suppression efficiency, it is proposed to adapt the acoustic method, taking into account the characteristics of the propagation of acoustic vibrations in the air, the psychophysical perception of sounds by the human ear, and the use of a

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9

Komarov, V. A. "Electromagnetic-acoustic conversion—a method of nondestructive testing." Soviet Physics Uspekhi 29, no. 9 (1986): 891–92. http://dx.doi.org/10.1070/pu1986v029n09abeh003517.

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10

Zhang, Chuanxin, Xue Jiang, Shuai Han, et al. "Converged wireless infrastructure with acoustic holographic array." Applied Physics Reviews 9, no. 4 (2022): 041413. http://dx.doi.org/10.1063/5.0124759.

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Wireless technologies based on electromagnetic wave are crucial in the modern industry but nonoptimal in electromagnetic-restricted conditions such as underwater applications, where acoustic wave has been proposed as an indispensable approach. However, most of the current acoustic wireless methods could support single wireless function and control single device. A converged wireless infrastructure that simultaneously supports the mainstream wireless functions remains inaccessible for acoustics. The difficulty lies in constructing the dynamic control network consisting of multiple nodes with ac

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11

Schlensok, C., B. Schmülling, M. van der Giet, and K. Hameyer. "Electromagnetically excited audible noise – evaluation and optimization of electrical machines by numerical simulation." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 26, no. 3 (2007): 727–42. http://dx.doi.org/10.1108/03321640710751181.

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PurposeDisturbing vibrations and noise of electrical machines are gaining impact. The paper aims to focus on the necessity of estimating the electromagnetic, structure‐dynamical, and acoustic behaviour of the machine during designing and before proto‐typing.Design/methodology/approachAn adequate tool is numerical simulation applying the finite‐element method (FEM) and the boundary‐element method (BEM) allowing for the structured analysis and evaluation of audible noise also caused by manufacturing tolerances.FindingsThe simulated results show good accordance to measurement results. The methods

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12

Aman, Ayush, and S. Prasad. "Controlling the electromagnetic density of modes in one-dimensional photonic crystal with defect using acoustic wave." Canadian Journal of Physics 96, no. 12 (2018): 1333–37. http://dx.doi.org/10.1139/cjp-2017-0844.

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We have theoretically analyzed the effect of acoustic parameters on the electromagnetic density of modes (DOM) in a one-dimensional photonic crystal featuring a defect mode. The whole structure is modulated by a longitudinal acoustic wave. The transfer matrix method and Wigner time approach are used to calculate the transmittance and electromagnetic DOM, respectively. The results show that the electromagnetic DOM is dynamically controlled by the acoustic amplitude. A sharp peak in DOM is found at the defect site whose magnitude decreases with the increase in acoustic amplitude and shows period

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13

Konovalenko, A., N. M. Makarov, and F. Pérez-Rodríguez. "Electromagnetoelastic transport through a piezoelectric slab: Selective parity interplay of electromagnetic and acoustic resonances." AIP Advances 13, no. 3 (2023): 035320. http://dx.doi.org/10.1063/5.0140126.

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We present the complete solution concerning to transport properties of coupled transverse electromagnetic and shear acoustic waves propagating via a piezoelectric slab embedded into a homogeneous dielectric medium. Since the electroacoustics of our setup is governed by four electromagnetoelastic eigenmodes, we had to succeed in developing a 4 × 4 transfer matrix method to analytically resolve the problem. As a result, the exact frequency spectra of the transmission, reflection, and transformation transport coefficients were obtained and analyzed in detail for two basic cases where the piezoele

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14

MAPONI, PIERLUIGI, and FRANCESCO ZIRILLI. "THE USE OF THE HERGLOTZ FUNCTION METHOD TO RECONSTRUCT OBSTACLES FROM REAL AND FROM SYNTHETIC SCATTERING DATA." Journal of Computational Acoustics 09, no. 02 (2001): 655–70. http://dx.doi.org/10.1142/s0218396x01000942.

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We consider the problem of the reconstruction of the shape of an obstacle from some knowledge of the scattered waves generated from the interaction of the obstacle with known incident waves. More precisely we study this inverse scattering problem considering acoustic waves or electromagnetic waves. In both cases the waves are assumed harmonic in time. The obstacle is assumed cylindrically symmetric and some special incident waves are considered. This allows us to formulate the two scattering problems, i.e. the acoustic scattering problem and the electromagnetic scattering problem, as a boundar

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15

Komarov, V. A. "MAGNETOELASTIC ELECTROMAGNETIC ACOUSTIC TRANSFORMATION. PART VI." Kontrol'. Diagnostika, no. 262 (April 2020): 14–21. http://dx.doi.org/10.14489/td.2020.04.pp.014-021.

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Анотація:

In the case of EMAT using overhead transducers, a high-frequency alternating and strong polarizing magnetic fields jointly act on the magnetoelastic medium. These fields can be positioned at different directions to each other. The article analyzes the situation when the polarizing field, located along the interface of the media and the normal component of the emitter variable field are orthogonally related. That is, the classic Wiedemann effect is implemented in EMAT. It has been shown that the Wiedemann effect in EMAT contributes primarily to the generation of shear waves. The generation of l

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16

Komarov, V. A. "MAGNETOELASTIC ELECTROMAGNETIC ACOUSTIC TRANSFORMATION. PART VI." Kontrol'. Diagnostika, no. 262 (April 2020): 14–21. http://dx.doi.org/10.14489/td.2020.04.pp.014-021.

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Анотація:

In the case of EMAT using overhead transducers, a high-frequency alternating and strong polarizing magnetic fields jointly act on the magnetoelastic medium. These fields can be positioned at different directions to each other. The article analyzes the situation when the polarizing field, located along the interface of the media and the normal component of the emitter variable field are orthogonally related. That is, the classic Wiedemann effect is implemented in EMAT. It has been shown that the Wiedemann effect in EMAT contributes primarily to the generation of shear waves. The generation of l

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17

Sebko, V. P., G. M. Suchkov, and A. V. Malakhov. "Ultrasonic testing of railheads using the electromagnetic-acoustic method." Russian Journal of Nondestructive Testing 40, no. 7 (2004): 442–48. http://dx.doi.org/10.1007/s11181-005-0064-2.

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18

Mori, Yasuhiko, P. Sedlak, and Josef Sikula. "Estimation of Rock In-Situ Stress by Acoustic and Electromagnetic Emission." Advanced Materials Research 13-14 (February 2006): 357–62. http://dx.doi.org/10.4028/www.scientific.net/amr.13-14.357.

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The Kaiser Effect in acoustic emission is often used for an estimation of the stress to which rocks have been subjected. However, there are cases in which the Kaiser Effect is not clear, since the noises due to the contact and/or the stick slip between the pre-induced fracture surfaces are measured during the reloading process. In such cases, estimation of previous stress is difficult by the conventional method which is based on the acoustic emission activity observed under reloading process. In the tests for the Kaiser Effect on rocks, therefore, the noises must be eliminated from the acousti

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19

Sikula, Josef, J. Majzner, P. Sedlak, and Yasuhiko Mori. "Electromagnetic and Acoustic Emission Fine Spectra." Advanced Materials Research 13-14 (February 2006): 169–74. http://dx.doi.org/10.4028/www.scientific.net/amr.13-14.169.

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A new measuring method for the detection of fine spectra of electromagnetic and acoustic emission (EME and AE) signals from small cracks is described. It requires wide band ultra-low noise amplifiers, analogue filters, the optimization of signal to noise ratio of sensors and the application of noise elimination methods. Analyses of noise sources in sensors and preamplifiers are given. They are thermal noise, polarization noise and low frequency 1/f noise. Measuring set-up background noise suppression involving also the electromagnetic shielding allows us to detect signals in the range of 1 to

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20

Bashirov, M. G., E. M. Bashirova, I. G. Yusupova, and D. Sh Akchurin. "Analysis of the influence of the stress-strain state of oil and gas equipment metal on the parameters of electromagnetic-acoustic conversion." E3S Web of Conferences 480 (2024): 01004. http://dx.doi.org/10.1051/e3sconf/202448001004.

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Анотація:

In the oil and gas industry, to assess the technical condition of equipment, diagnostic methods and tools are used aimed at identifying defects that are unacceptable, according to regulatory documents. In places where mechanical stress is concentrated, microdefects in the metal structure arise, which, under the influence of static and dynamic loads, develop into macrodefects that cause equipment destruction. To identify areas of concentration of mechanical stress and localize metal microdamages, it is proposed to use a non-contact, high-performance electromagnetic-acoustic diagnostic method. B

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21

Kepic, Anton W., Michael Maxwell, and R. Don Russell. "Field trials of a seismoelectric method for detecting massive sulfides." GEOPHYSICS 60, no. 2 (1995): 365–73. http://dx.doi.org/10.1190/1.1443772.

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An underground test of a seismoelectric prospecting method for massive sulfides was performed at the Mobrun Mine (Rouyn‐Noranda, Quebec) in June 1991. The method is based upon the conversion of seismic energy to high‐frequency pulses of electromagnetic radiation by sulfide minerals. The delay between shot detonation and detection of the electromagnetic radiation gives a one‐way traveltime for the acoustic wave to reach the zone of seismoelectric conversion, which when combined with P‐wave velocity allows the shot‐to‐ore zone distance to be calculated. A 0.22-kg explosive charge located within

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22

Bashirov, M. G., N. N. Luneva, I. G. Khusnutdinova, E. M. Bashirova, N. M. Zakharov, and R. R. Gaziev. "Perfecting evaluation methods of energy equipment technical condition and resource based on electromagnetic-acoustic effect." E3S Web of Conferences 124 (2019): 05034. http://dx.doi.org/10.1051/e3sconf/201912405034.

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Анотація:

To assess the technical condition and resource for the safe operation of electric and electrical equipment, it is proposed to use the electromagnetic-acoustic effect and the dynamic identification method based on the analysis of the coordinates of the roots of the characteristic equation (polynomial of the denominator of the transfer function of the system “control object electromagnetic-acoustic transducer”) on the complex plane . The transfer function of the studied system “control object electromagneticacoustic transducer” is an integral quantitative parameter characterizing the state of th

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23

Bashirov, M. G., E. M. Bashirova, I. G. Yusupova, and D. Sh Akchurin. "Study of the relationship between the parameters of electromagnetic-acoustic transformation and the stress-strain state of the metal to solve the problem of remote monitoring of power equipment." E3S Web of Conferences 480 (2024): 01005. http://dx.doi.org/10.1051/e3sconf/202448001005.

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Анотація:

The implementation of Russia’s energy strategy provides for the creation of an intelligent control system for active-adaptive electrical networks of the electric power complex, which contains a system for remote diagnostic monitoring of energy equipment, including metal load-bearing structures of electrical energy generation, transmission and consumption facilities. Promising in this regard is the use of a high-performance electromagnetic-acoustic method, which allows non-contact detection of metal defects and monitoring of their stress-strain state. But existing electromagnetic-acoustic diagn

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24

Bespalko, A. A., D. D. Dann, M. V. Petrov, and E. K. Pomishin. "Acoustic-electrical testing of defects in the cement-sand and cement-glass model samples." Bulletin of the Karaganda University. "Physics" Series 103, no. 3 (2021): 6–16. http://dx.doi.org/10.31489/2021ph3/6-16.

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A complex method of acoustic-electrical testing of defects in dielectric samples made from cement-sand and cement-glass mixtures is discussed. The paper reports the results of studies of changes in the parameters of electromagnetic responses and their spectra under pulsed deterministic acoustic excitation of model samples with defects in the form of solid-state inclusions. The results of mathematical calculations of the time variation in the stress-strain state induced in a defective dielectric model sample by deterministic acoustic pulse are presented. The relationship is shown between the pa

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25

Li, Huibin, Peiyun Xu, Cheng Cao, Dongmei Hu, Xiaojun Yan, and Zhihuan Song. "Acoustic Simulation of the Electric Vehicle Motor." Journal of Physics: Conference Series 2095, no. 1 (2021): 012031. http://dx.doi.org/10.1088/1742-6596/2095/1/012031.

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Abstract People pay more and more attention to NVH (N-noise, V-vibration, and H-harshness) characteristics of electric vehicles and motors. The vibration and noise of the electric vehicle motor is a complex multi physical field problem, related to electromagnetic, mechanical, structural and sound fields. In this paper, firstly, the Maxwell electromagnetic field analysis software is used to build the electromagnetic simulation model of PMSM(Permanent magnet synchronous motor) motor, and then the electromagnetic excitation is calculated. Then, the magnetic solid coupling analysis is carried out

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26

Yang, ZHENG, ZHOU Jinjie, ZHANG Zongjian, and TAN Jidong. "Research on Frequency Adaptive Optimization Method of Electromagnetic Acoustic Testing." Journal of Mechanical Engineering 55, no. 14 (2019): 11. http://dx.doi.org/10.3901/jme.2019.14.011.

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27

Cheng, Yiyang, Zhen Wang, and Yuanxia Zhang. "Electromagnetic noise characteristics analysis and noise traceability in induction motor." Journal of Physics: Conference Series 2787, no. 1 (2024): 012031. http://dx.doi.org/10.1088/1742-6596/2787/1/012031.

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Abstract To investigate the electromagnetic vibration and noise issues in induction motors, this study employs a combined methodology of experimental, theoretical, and simulation approaches to analyze the characteristics of electromagnetic noise. Initially, a theoretical analysis of the radial electromagnetic force of the motor is conducted, followed by a simulation of the motor’s electromagnetic vibration and noise at a working condition of 3000 rpm, incorporating a Multiphysics coupled analysis of electromagnetic-vibration-noise. Vibration testing on a specific compressor motor reveals that

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28

Mirchev, Yordan, Pavel Ivanov, Desislava Pashkuleva, Mitko Mihovski, Boris Velev, and Valeriy Vengrinovich. "Investigation of Influence on Mechanical Stress to Change in Magneto Noise and Magneto Electro-acoustic Characteristics in Ferromagnetic Steel." NDT Days 3, no. 5 (2020): 271–78. https://doi.org/10.5281/zenodo.4769739.

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The paper presents the results of complex research on low carbon steel S235. The research was carried out using electromagnetic methods, the Barkhausen noise method and a magnetic-acoustic emission method with the Multitest-MS10 equipment developed at the Institute of Mechanics (IMech) – Bulgarian Academy of Sciences (BAS).

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29

Laura, Patricio A. A. "Nondestructive Testing and Structural Condition Monitoring of Mechanical Cables." Applied Mechanics Reviews 46, no. 4 (1993): 133–38. http://dx.doi.org/10.1115/1.3120320.

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This article concerns the problem of evaluating the `structural health’ of cables or ropes by means of non-destructive testing methods. Special emphasis is placed upon electromagnetic techniques and the acoustic emission method.

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30

Muravieva, O. V., V. V. Muraviev, L. V. Volkova, A. L. Vladykin, and K. Yu Belosludtsev. "Acoustic properties of 15-5 PH maraging steel after energy deposition." Frontier materials & technologies, no. 2 (2024): 87–100. http://dx.doi.org/10.18323/2782-4039-2024-2-68-8.

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The study of the acoustic properties of maraging steels operated under various energy force and temperature actions is a critical task, since it is the method of acoustic structuroscopy that provides the most reliable connection with the structure, stress-strain state and mechanical properties of steels. The paper is devoted to research of the acoustic properties of the 15-5 PH maraging steel samples under various types of heat treatment under the conditions of mechanical tensile and cyclic loads. Samples of the 15-5 PH maraging steel were studied in three structural states: solid solution ann

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31

Shin, Su Hyun, Yong Bong Lee, Sung Soo Jung, and Doo Hee Lee. "Determination of the Young's Modulus and Loss Factor by Acoustic Bending Vibration Methods." Key Engineering Materials 297-300 (November 2005): 1958–61. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.1958.

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A new acoustic bending vibration method of determining the resonance frequency, Young’s modulus and loss factor applicable for both metallic and non-metallic materials is proposed. Measurements were conducted by using both conventional electromagnetic excitation method specified by ASTM E 756 and ISO 6721 and our method for conductive metallic specimen of stainless steel and non-metallic polypropylene specimen. Difference in the mechanical properties observed between both methods is attributed to the presence of a metal disk attached to the non-metallic sample for electromagnetic. However, the

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32

Liu, Xiaofei, Siqing Zhang, Enyuan Wang, Zhibo Zhang, Yong Wang, and Shengli Yang. "Multi-Index Geophysical Monitoring and Early Warning for Rockburst in Coalmine: A Case Study." International Journal of Environmental Research and Public Health 20, no. 1 (2022): 392. http://dx.doi.org/10.3390/ijerph20010392.

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Rockburst is a major disaster in deep mining, restricting the safety and the production efficiency of the Laohutai Coal Mine in Fushun, Liaoning Province. To predict and prevent coalmine rockbursts, a comprehensive method based on multi-instrument monitoring is proposed by using a YDD16 acoustic-electromagnetic monitor and microseismic monitoring system, including microseismic (MS) monitoring, electromagnetic radiation (EMR) monitoring, and acoustic emission (AE) monitoring. Field investigation shows that MS, AE, and EMR signals have abnormal precursors before rockbursts in a new working face.

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33

Tane, Masakazu, and Hideo Nakajima. "Elastic and Plastic Deformation Behaviors of Lotus-Type Porous Copper." Materials Science Forum 658 (July 2010): 332–35. http://dx.doi.org/10.4028/www.scientific.net/msf.658.332.

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The elastic and plastic deformation behaviors of lotus-type porous copper (lotus copper) with cylindrical pores oriented in one direction were investigated using two acoustic methods (resonant ultrasound spectroscopy and acoustic emission method). All the independent components of elastic stiffness were determined by resonant ultrasound spectroscopy combined with electromagnetic acoustic resonance method, which revealed that the Young’s modulus exhibits the anisotropy originating from the anisotropic porous structure and anisotropic matrix texture. The porosity dependence of the anisotropic Yo

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34

Gao, Yang, Bin Zhou, Yi He, and Wan Jing He. "Electromagnetic Compatibility Analysis Method for FBAR Devices." Applied Mechanics and Materials 719-720 (January 2015): 452–60. http://dx.doi.org/10.4028/www.scientific.net/amm.719-720.452.

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With the increasing of resonant frequency and integration of film bulk acoustic resonator (FBAR), the electromagnetic interference (EMI) of FBAR devices appears to be extremely important. The electric fields of the common electrical model and finite element model are assumed to be quasi-static and cannot simulate the electromagnetic (EM) property. A 3-D EM model of FBAR is achieved by means of high frequency EM simulation software HFSS. A real-time simulation of EM distributed effects, EM coupling and piezoelectric effects is achieved by employing an effective permittivity in the EM model. The

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35

Bondarenko, B. M. "METHODS OF DETERMINATION OF PARAMETERS OF ELECTROMAGNETIC RELAYS." Science and Transport Progress, no. 15 (April 25, 2007): 7–10. http://dx.doi.org/10.15802/stp2007/17668.

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A method of mechanical and electric parameters control of electromagnetic relays without removal of protective casing is expounded in the article. Control of diagnostic signals obtained by three informative channels: electric, optical and acoustic has been put in the basis. An installation diagram which realizes the proposed method has been provided.

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Dong, Qichao, Xintian Liu, Hongzhong Qi, and Yafu Zhou. "Vibro-acoustic prediction and evaluation of permanent magnet synchronous motors." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 234, no. 12 (2020): 2783–93. http://dx.doi.org/10.1177/0954407020919659.

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In this study, a multiphysics finite element method is proposed to predict and evaluate the electromagnetic vibration and noise of the permanent magnet synchronous motors. First, the expressions of radial electromagnetic force waves were derived based on the established mathematical models of airgap magnetic field using the analytical methods. Subsequently, the main circumferential spatial orders influencing electromagnetic noise were analyzed and discussed. Then, a multiphysics simulation model that consists of mechanical field, electromagnetic field, and acoustic field was established for th

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37

Hur, Sunghoon, Hyun Soo Kim, and Hyun-Cheol Song. "Ultrasound Mediated Wireless Power Transfer Technology." Ceramist 24, no. 3 (2021): 314–26. http://dx.doi.org/10.31613/ceramist.2021.24.3.05.

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Wireless energy transfer (WET) is the transmission of electric power without any physical connections such as wires. Currently, inductive coupling mediated by electromagnetic (EM) waves is the most common method of WET and is widely used to charge portable devices such as smartphones, Bluetooth earphones, electric shavers, and visual prostheses. However, its application is still limited due to a number of issues including low efficiency, short charging distance, heating problem, and limited choice of transmission medium. Due to these issues, EM-based WET cannot be applied to implantable medica

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38

Dao, Duy-Vinh, Jen-Tzong Jeng, Van-Dong Doan, Huu-Thang Nguyen, and Bo-Yao Liang. "Development of Electromagnetic Acoustic Transducer System for Coin Classification." Sensors 22, no. 23 (2022): 9055. http://dx.doi.org/10.3390/s22239055.

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In this work, a method for identifying counterfeit coins based on an electromagnetic acoustic transducer (EMAT) to detect the difference in the coin’s natural acoustic frequency response is presented. In the experimental system, the acoustic oscillation induced by a pulsed magnetic field is received by a microphone and recorded by an oscilloscope. The natural acoustic frequency of the coin is resolved by the fast Fourier transform (FFT) method on the computer. It is found that the natural frequencies of the possible counterfeit coins deviate significantly from the standard ranges of 16.9 to 17

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39

Malešević, Nevena, Mileta Žarković, Denis Ilić, and Đorđe Jovanović. "Partial discharges measurement by UHF method." Zbornik radova Elektrotehnicki institut Nikola Tesla 30, no. 30 (2020): 1–9. http://dx.doi.org/10.5937/zeint30-28749.

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The unconventional UHF (Ultra High Frequency) method of measuring partial discharges (PD) is based on measuring electromagnetic waves (EM) in the UHF frequency band (300-3000) MHz, using appropriate antennas. This method is unconventional, but is widely accepted due to the possibility of application in plants in the online mode and quick review (screening) of the plant. Also, this method is characterized by a high degree of measurement sensitivity and relatively good resistance to interference. As the PD pulses are of very short duration, of the order of nanoseconds, they generate an electroma

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40

Lu, Junqiang, Zhenyu Qin, Baiyong Men, and Hongzhi Chen. "Electromagnetic compatibility study of acoustoelectric logging detector." Journal of Physics: Conference Series 2822, no. 1 (2024): 012071. http://dx.doi.org/10.1088/1742-6596/2822/1/012071.

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Abstract The acoustoelectric effect logging detector can achieve downhole acoustoelectric effect measurement, but the excitation of the acoustic transducer can generate significant electromagnetic interference (EMI) signals, it is difficult to effectively measure weak converted signals of acoustoelectric effect underground. The EMI problem of acoustoelectric effect logging detectors can be solved by studying EMI characteristics. Based on the analysis of the structure, measurement function, and measured interference signals of the receiving electrodes of the detector, the EMI sources, coupling

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41

HARA, Shoichiro, Ryoichi URAYAMA, Tetsuya UCHIMOTO, and Toshiyuki TAKAGI. "A212 Experimental verification of numerical analysis for electromagnetic acoustic resonance method." Proceedings of the National Symposium on Power and Energy Systems 2015.20 (2015): 181–82. http://dx.doi.org/10.1299/jsmepes.2015.20.181.

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42

Deordiev, G. I., and V. E. Shcherbinin. "Testing of Mass Products by Resonance Electromagnetic-Acoustic Method (A Review)." Russian Journal of Nondestructive Testing 39, no. 12 (2003): 897–912. http://dx.doi.org/10.1023/b:runt.0000026011.47602.e4.

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43

Murav’ev, V. V., L. V. Volkova, A. V. Platunov, and V. A. Kulikov. "An electromagnetic-acoustic method for studying stress-strain states of rails." Russian Journal of Nondestructive Testing 52, no. 7 (2016): 370–76. http://dx.doi.org/10.1134/s1061830916070044.

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44

Eskandarzade, M., T. Kundu, N. Liebeaux, D. Placko, and F. Mobadersani. "Numerical simulation of electromagnetic acoustic transducers using distributed point source method." Ultrasonics 50, no. 6 (2010): 583–91. http://dx.doi.org/10.1016/j.ultras.2009.12.003.

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45

Muravyov, V. V., O. V. Muravyova, T. R. Vagapov, V. E. Makarova, and E. A. Stepanova. "Acoustic and Electromagnetic Properties of Civilian Gun Blanks." Intellekt. Sist. Proizv. 21, no. 1 (2023): 59–70. http://dx.doi.org/10.22213/2410-9304-2023-1-59-70.

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The non-uniformity of acoustic properties of civilian gun barrel blanks has been studied. Four samples of civilian gun barrel blanks from the same batch, obtained after the first stage of the technological process, were subjected to the study. The blanks are of cylindrical shape with diameter of 34 mm, 210 mm in length and are made of high quality carbon steel 50A. In the research, a control echo-shadow method of multiple reflections was used with the application of an electromagnetic-acoustic transducer and a piezoelectric transducer based on a polyvinyl-dente-fluoride film for excitation and

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46

Vagin, A. V. "Acoustic Method of Information Transmission in a Horizontal Directional Drilling Device." LETI Transactions on Electrical Engineering & Computer Science 16, no. 7 (2023): 15–25. http://dx.doi.org/10.32603/2071-8985-2023-16-7-15-25.

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An acoustic method has been developed for transmitting information about the coordinates of the drill head during the operation of a horizontal directional drilling device during the project laying of communications. The paper considers the traditional technology of horizontal directional drilling, and the electromagnetic method of transmitting information in trenchless laying of communications. An acoustic channel for information transmission has been studied in terms of asynchronous data transmission. The temporal structure of the signal, as well as the structure of the byte issued in acoust

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47

Minin, Igor V., and Oleg V. Minin. "Comment on Mahariq et al. Investigation and Analysis of Acoustojets by Spectral Element Method. Mathematics 2022, 10, 3145." Mathematics 10, no. 23 (2022): 4502. http://dx.doi.org/10.3390/math10234502.

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The paper under discussion has some shortcomings in regard to mathematical formulation of the problem related to acoustics, its justification, some references analyses and the text, and we feel that this study has not been finished to its full extent. From the point of view of acoustic jet formation, the mathematical model used by the authors has a number of significant limitations which are not taken into account. Moreover, the formal analogy between the parameters of electromagnetic waves and acoustic waves should be used with caution in the conditions of localized beams (acoustic jet), and

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48

Lyagushyn, S., and A. Sokolovsky. "Superradiance and solids: Reduced description method." Low Temperature Physics 50, no. 1 (2024): 103–9. http://dx.doi.org/10.1063/10.0023899.

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Spontaneous ordering in a system of excited emitters with a powerful short radiation pulse predicted by Dicke attracted the great attention of scientists for decades as a bright example of the nontrivial behavior of a nonequilibrium system. The Bogolyubov reduced description method has some advantages and provides new possibilities in the theoretical investigation of the Dicke process. The paper presents the authors’ results of modeling such processes concerning both optical ones in the presence of crystal lattice influence and acoustic superradiance, which is possible in solids. The right cho

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Wang, Jie, Hai Lin, Huaihai Guo, Qi Zhang, and Junxiang Ge. "Similarity Study of Electromagnetic and Underwater Acoustic Scattering by Three-Dimensional Targets in Unbounded Space." Journal of Marine Science and Engineering 11, no. 2 (2023): 440. http://dx.doi.org/10.3390/jmse11020440.

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The characterization of targets by electromagnetic (EM) scattering and underwater acoustic scattering is an important object of research in these two related fields. However, there are some difficulties in the simulation and measurement of the scattering by large targets. Consequently, a similarity study between acoustic and EM scattering may help to share results between one domain and the other and even provide a general reference method for the simulation of scattering characteristics in both fields. Based on the method of physical optics, the similarity between the EM scattering of conduct

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Guan, Yaojun, and Yang Gao. "Structural Design and Optimization of Low-Frequency High-Power Electromagnetic Transducer." International Journal of Acoustics and Vibration 29, no. 2 (2024): 116–24. http://dx.doi.org/10.20855/ijav.2024.29.22028.

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Crucial equipment for marine engineering and research, high-power ultra-low frequency sound sources have become necessary with the rapid development of seabed resource exploration, marine environment monitoring, underwater remote target detection, and communication technology. The current ultra-low frequency sound source cannot meet the requirements of practical applications. In this paper, both the finite element method and equivalent circuit method are used to improve the electromagnetic acoustic transducer, focusing on solving the structural design of the functional parts of the transducer,

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