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Journal articles on the topic 'Standing wave design'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Qin, Shufang, Jun Fan, Haiming Zhang, Junwei Su, and Yi Wang. "Flume Experiments on Energy Conversion Behavior for Oscillating Buoy Devices Interacting with Different Wave Types." Journal of Marine Science and Engineering 9, no. 8 (August 8, 2021): 852. http://dx.doi.org/10.3390/jmse9080852.

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Oscillating buoy device, also known as point absorber, is an important wave energy converter (WEC) for wave energy development and utilization. The previous work primarily focused on the optimization of mechanical design, buoy’s array configuration and the site selection with larger wave energy density in order to improve the wave energy generation performance. In this work, enlightened by the potential availability of Bragg reflection induced by multiple submerged breakwaters in nearshore areas, we investigate the energy conversion behavior of oscillating buoy devices under different wave types (traveling waves, partial and fully standing waves) by flume experiments. The localized partial standing wave field is generated by the Bragg resonance at the incident side of rippled bottoms. Furthermore, the fully standing wave field is generated by the wave reflection of vertical baffle installed in flume. Then the wave power generation performance is discussed under the conditions with the same wave height but different wave types. The experimental measurements show that the energy conversion performance of the oscillating buoy WEC could be improved under the condition of standing waves when compared with traveling waves. This work provides the experimental comparison evidence of wave energy conversion response of oscillating buoy devices between travelling waves and standing (fully or partial) wave conditions.

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2

Kutsaev, S. V., N. P. Sobenin, A. Yu Smirnov, D. S. Kamenschikov, M. A. Gusarova, K. I. Nikolskiy, A. A. Zavadtsev, and M. V. Lalayan. "Design of hybrid electron linac with standing wave buncher and traveling wave structure." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 636, no. 1 (April 2011): 13–30. http://dx.doi.org/10.1016/j.nima.2011.01.047.

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3

Tartibu, L. K., B. Sun, and M. A. E. Kaunda. "Optimal Design of A Standing Wave Thermoacoustic Refrigerator Using GAMS." Procedia Computer Science 62 (2015): 611–18. http://dx.doi.org/10.1016/j.procs.2015.08.555.

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4

Zhang, Wei, You-de Hu, and Li-rong Zheng. "Design and simulation of a standing wave oscillator based PLL." Frontiers of Information Technology & Electronic Engineering 17, no. 3 (March 2016): 258–64. http://dx.doi.org/10.1631/fitee.1500210.

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5

Mallmann, T., B. D. Burris, Z. Ma, and N. H. L. Wang. "Standing wave design of nonlinear SMB systems for fructose purification." AIChE Journal 44, no. 12 (December 1998): 2628–46. http://dx.doi.org/10.1002/aic.690441206.

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6

Hritzko, Benjamin J., Yi Xie, Robert J. Wooley, and Nien-Hwa L. Wang. "Standing-wave design of tandem SMB for linear multicomponent systems." AIChE Journal 48, no. 12 (December 2002): 2769–87. http://dx.doi.org/10.1002/aic.690481207.

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7

Desai, A. B., K. P. Desai, H. B. Naik, and M. D. Atrey. "Design and analysis of standing wave quarter wavelength thermoacoustic engine." Indian Journal of Cryogenics 41, no. 1 (2016): 69. http://dx.doi.org/10.5958/2349-2120.2016.00005.4.

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8

Wang, Hai Peng, Shu Hui Yang, Meng Lu Feng, and Yin Chao Chen. "Design and Simulation of S-Band Low Noise Amplifier Based on ATF-54143." Applied Mechanics and Materials 577 (July 2014): 615–19. http://dx.doi.org/10.4028/www.scientific.net/amm.577.615.

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This design used a low noise enhanced high electron mobility transistor ATF54143 and Agilent's ADS simulation software to achieve the good performance of operating frequency at 2.45GHz, noise figure (NF) is less than 0.8dB, band gain (S21) is greater than 15dB, input voltage standing-wave ratio (VSWR1) is less than 1.4dB, output voltage standing-wave ratio (VSWR2) is less than 1.6dB.

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9

Liu, Jun Kao, Tao Xie, Wei Shan Chen, and Chang Hua Jia. "A Standing Wave Ultrasonic Motor Using Longitudinal Vibration Transducers." Key Engineering Materials 474-476 (April 2011): 661–65. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.661.

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A new type standing wave ultrasonic motor is proposed in this study. In this design, three longitudinal vibration transducers are clamped on the inner side of a ring with driving teeth by screws. Bending standing wave can be generated in the ring by the longitudinal vibrations of the transducers. Thus, oblique linear simple harmonic vibrations are formed on the teeth, which can drive the rotor by frictional force. The structure and working principle of the proposed design are introduced. The motor is designed and analyzed by using FEM method. A standing wave is gained after the degeneration between the bending vibration of the ring and the longitudinal vibration of the transducer. The test results of the prototype motor verify the feasibility of the proposed design.

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10

Jovanov, Vladislav, Patrice Donfack, Arne Müller, Arnulf Materny, Dietmar Knipp, and Veit Wagner. "Standing wave spectrometer with semi-transparent organic detector." Journal of Materials Chemistry C 6, no. 42 (2018): 11457–64. http://dx.doi.org/10.1039/c8tc03195a.

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Optical properties of organic materials such as polymer–fullerene mixtures enable realization of semi-transparent photodetectors with superior design and features for standing wave spectrometer applications.

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11

Jun-Chau Chien and Liang-Hung Lu. "Design of Wide-Tuning-Range Millimeter-Wave CMOS VCO With a Standing-Wave Architecture." IEEE Journal of Solid-State Circuits 42, no. 9 (September 2007): 1942–52. http://dx.doi.org/10.1109/jssc.2007.903050.

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12

Durachman, Yusuf. "Fabrication of Horn Antenna for Microwave Application." International Innovative Research Journal of Engineering and Technology 6, no. 2 (December 30, 2020): EC—17—EC—27. http://dx.doi.org/10.32595/iirjet.org/v6i2.2020.138.

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This paper contains a novel design of a horn antenna control system for microwave applications. Using “Fermat’s principle” the horn antenna is designed and fabricated. For microwave applications, high gain and low voltage standing wave ratio(VSWR) is needed, so for that purpose horn antenna is fabricated. In a previous paper, they designed the Yagi Uda antenna which is used for multiple driven elements by the method called maximum power transmission efficiency. For multiple driven elements, the horn antenna cannot be fabricated. If suppose yagi uda is fabricated using the principle called Fermat's, the system can't achieve more gain and low voltage standing wave ratio. Yagi uda antenna can achieve only a high voltage standing wave ratio. To reduce the problems in the existing paper, our paper designs a horn antenna to achieve high gain and low voltage standing wave ratio( VSWR) which is used for microwave applications to transmit microwaves from a waveguide out into space or collect microwaves into a waveguide for the reception.

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13

Wang, Yu-Jen, Yi-Cheng Chen, and Sheng-Chih Shen. "Design and analysis of a standing-wave trapezoidal ultrasonic linear motor." Journal of Intelligent Material Systems and Structures 26, no. 17 (October 16, 2014): 2295–303. http://dx.doi.org/10.1177/1045389x14554130.

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14

CHAU, K. T., B. SHI, and M. Q. HU. "A New Design Approach for Spatially Shifted Standing-Wave Ultrasonic Motors." Electric Power Components and Systems 32, no. 7 (July 2004): 725–43. http://dx.doi.org/10.1080/15325000490461082.

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15

Soepriatna, Nicholas, N. H. Linda Wang, and Phillip C. Wankat. "Standing Wave Design of 2-Zone Thermal Simulated Moving Bed Concentrator (TSMBC)." Industrial & Engineering Chemistry Research 54, no. 50 (December 8, 2015): 12646–63. http://dx.doi.org/10.1021/ie504939z.

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16

Neilson, Jeffrey, Sami Tantawi, and Valery Dolgashev. "Design of RF feed system and cavities for standing-wave accelerator structure." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 657, no. 1 (November 2011): 52–54. http://dx.doi.org/10.1016/j.nima.2011.05.015.

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17

Wei, Bai, Xu Zhou, Jin Xiao, and Li Ming. "Physical design and cooling test of C-band standing wave accelerating tube." Chinese Physics 15, no. 2 (January 16, 2006): 319–23. http://dx.doi.org/10.1088/1009-1963/15/2/015.

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18

Lee, Ki Bong, Sungyong Mun, Fattaneh Cauley, Geoffrey B. Cox, and Nien-Hwa Linda Wang. "Optimal Standing-Wave Design of Nonlinear Simulated Moving Bed Systems for Enantioseparation." Industrial & Engineering Chemistry Research 45, no. 2 (January 2006): 739–52. http://dx.doi.org/10.1021/ie0504248.

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19

Xie, Yi, Dingjun Wu, Zidu Ma, and N. H. Linda Wang. "Extended Standing Wave Design Method for Simulated Moving Bed Chromatography: Linear Systems." Industrial & Engineering Chemistry Research 39, no. 6 (June 2000): 1993–2005. http://dx.doi.org/10.1021/ie9905052.

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20

Rooks, Michael J., Richard C. Tiberio, Michael Chapman, Troy Hammond, Edward Smith, Alan Lenef, Richard Rubenstein, et al. "Coherence and Structural Design of Free-Standing Gratings for Atom-Wave Optics." Japanese Journal of Applied Physics 34, Part 1, No. 12B (December 30, 1995): 6935–39. http://dx.doi.org/10.1143/jjap.34.6935.

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21

Lee, Ki Bong, Rahul B. Kasat, Geoffrey B. Cox, and Nien-Hwa Linda Wang. "Simulated moving bed multiobjective optimization using standing wave design and genetic algorithm." AIChE Journal 54, no. 11 (November 2008): 2852–71. http://dx.doi.org/10.1002/aic.11604.

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22

Wu, Huaying, Jingjun Zhu, Xuan Wang, and Yuqiang Li. "Design of ultrasonic standing wave levitation support for three-dimensional printed filaments." Journal of the Acoustical Society of America 149, no. 4 (April 2021): 2848–53. http://dx.doi.org/10.1121/10.0003922.

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23

Kletschkowski, Thomas, and Delf Sachau. "Design and Calibration Tests of an Active Sound Intensity Probe." Advances in Acoustics and Vibration 2008 (May 15, 2008): 1–8. http://dx.doi.org/10.1155/2008/574806.

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The paper presents an active sound intensity probe that can be used for sound source localization in standing wave fields. The probe consists of a sound hard tube that is terminated by a loudspeaker and an integrated pair of microphones. The microphones are used to decompose the standing wave field inside the tube into its incident and reflected part. The latter is cancelled by an adaptive controller that calculates proper driving signals for the loudspeaker. If the open end of the actively controlled tube is placed close to a vibrating surface, the radiated sound intensity can be determined by measuring the cross spectral density between the two microphones. A one-dimensional free field can be realized effectively, as first experiments performed on a simplified test bed have shown. Further tests proved that a prototype of the novel sound intensity probe can be calibrated.

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24

Eisinger, F. L., and R. E. Sullivan. "Unusual Acoustic Vibration in Heat Exchanger and Steam Generator Tube Banks Possibly Caused by Fluid-Acoustic Instability." Journal of Engineering for Gas Turbines and Power 115, no. 2 (April 1, 1993): 411–17. http://dx.doi.org/10.1115/1.2906724.

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Flow channels of heat exchangers or steam generators containing tube arrays can be subject to acoustic vibration excited by flow of air, gas, or steam tranversely across the tubes. Such vibration occurs when a flow disturbance inside the tube bank excites a strong acoustic (standing wave) mode of the channel. The acoustic modes typically excited are those related to the dimension perpendicular to both the fluid flow direction and the tube axes. Preventive measures taken in the design stage are typically directed against these commonly existing standing waves. Evidence is presented of the unusual occurrence of standing waves that develop in the flow direction and in the tube axial direction. The causes for their development and methods of suppression are discussed.

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25

Qu, Sichao, Yuxiao Hou, and Ping Sheng. "Conceptual-based design of an ultrabroadband microwave metamaterial absorber." Proceedings of the National Academy of Sciences 118, no. 36 (September 3, 2021): e2110490118. http://dx.doi.org/10.1073/pnas.2110490118.

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By introducing metallic ring structural dipole resonances in the microwave regime, we have designed and realized a metamaterial absorber with hierarchical structures that can display an averaged −19.4 dB reflection loss (∼99% absorption) from 3 to 40 GHz. The measured performance is independent of the polarizations of the incident wave at normal incidence, while absorption at oblique incidence remains considerably effective up to 45°. We provide a conceptual basis for our absorber design based on the capacitive-coupled electrical dipole resonances in the lateral plane, coupled to the standing wave along the incident wave direction. To realize broadband impedance matching, resistive dissipation of the metallic ring is optimally tuned by using the approach of dispersion engineering. To further extend the absorption spectrum to an ultrabroadband range, we employ a double-layer self-similar structure in conjunction with the absorption of the diffracted waves at the higher end of the frequency spectrum. The overall thickness of the final sample is 14.2 mm, only 5% over the theoretical minimum thickness dictated by the causality limit.

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26

Aktas, Murat K., Bakhtier Farouk, and Yiqiang Lin. "Heat Transfer Enhancement by Acoustic Streaming in an Enclosure." Journal of Heat Transfer 127, no. 12 (June 27, 2005): 1313–21. http://dx.doi.org/10.1115/1.2098858.

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Thermal convection in a differentially heated shallow enclosure due to acoustic excitations induced by the vibration of a vertical side wall is investigated numerically. The fully compressible form of the Navier-Stokes equations is considered and an explicit time-marching algorithm is used to track the acoustic waves. Numerical solutions are obtained by employing a highly accurate flux corrected transport algorithm. The frequency of the wall vibration is chosen such that an acoustic standing wave forms in the enclosure. The interaction of the acoustic standing waves and the fluid properties trigger steady secondary streaming flows in the enclosure. Simulations were also carried out for “off-design” vibration frequency where no standing waves were formed. The effects of steady second order acoustic streaming structures are found to be more significant than the main oscillatory flow field on the heat transfer rates. The model developed can be used for the analysis of flow and temperature fields driven by acoustic transducers and in the design of high performance resonators for acoustic compressors.

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27

Lee, Young Sup, and Jaehwa Kwon. "Separation and Concentration of Particles in Fluid Using Ultrasonic Standing Wave." Key Engineering Materials 321-323 (October 2006): 63–66. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.63.

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This paper presents the theory, design, and evaluation of a smart device for the enhanced separation of particles mixed in fluid. The smart device takes advantage of the ultrasonic standing wave, which was generated by the operation of a piezoceramic PZT patch installed in the smart device. The details of the device design including the electro-acoustical modelling for separation and PZT transducer are described at first. Based on this design, the separation device was fabricated and evaluated. In the experiments, an optical camera with a zoom lens was used to monitor the position of particles within the separation channel layer in the device. The electric impedance of the PZT patch bonded on the separation device was measured .The device shows a strong levitation and separation force against 50μm diameter particles mixed with water at the separation channel in the device. Experimental results also showed that the device can work at both heavy and light sand particles mixed with water due to the generated standing wave field in the separation channel.

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28

Jin, Xiaomin, Simeon Trieu, Gregory Chavoor, and Gabriel Halpin. "Enhancing GaN LED Efficiency through Nano-Gratings and Standing Wave Analysis." Nanomaterials 8, no. 12 (December 13, 2018): 1045. http://dx.doi.org/10.3390/nano8121045.

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Based on our recent work, this paper reviews our theoretical study on gallium nitride (GaN) light-emitting-diode (LED). The focus of the paper is to improve LED light extraction efficiency through various nano-grating designs. The gratings can be designed at different locations, such as at the top, the middle, and the bottom, on the LED. They also can be made of different materials. In this study, we first present a GaN LED error-grating simulation model. Second, nano Indium Tin Oxide (ITO) top gratings are studied and compared with conventional LED (CLED) using standing wave analysis. Third, we present results related to a patterned sapphire substrate (PSS), SiO2 Nanorod array (NR), and Ag bottom reflection layer. Finally, we investigate the nano-top ITO grating performance over different wavelengths to validate our design simulation, which focusing on a single wavelength of 460 nm.

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29

Tang, Hai Bo, and Xiao Zhong Shui. "Design of Antipodal Vivaldi Antenna Array." Applied Mechanics and Materials 380-384 (August 2013): 3465–68. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.3465.

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Firstly in this paper,an antipodal Vivaldi antenna is designed.The bandwidth is from 6GHz to 18GHz. The simulated results show good electric performance and the voltage standing wave ratio is less than 2 in the whole bandwidth.Secondly depending on this unit,this paper designs two kinds of arrays and estimates their radiation characteristics,respectively.The one array is a 1×8 array and the another array is a X-cross structure array with four elements.

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30

NAKASAKO, N., T. UEBO, A. MORI, and N. OHMATA. "Fundamental Consideration on Distance Estimation Using Acoustical Standing Wave." IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E91-A, no. 4 (April 1, 2008): 1218–21. http://dx.doi.org/10.1093/ietfec/e91-a.4.1218.

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31

Zarei, S., F. Abbasi Davani, M. Lamehi Rachti, and F. Ghasemi. "Design of a side coupled standing wave accelerating tube for NSTRI e-Linac." Journal of Instrumentation 12, no. 09 (September 22, 2017): P09026. http://dx.doi.org/10.1088/1748-0221/12/09/p09026.

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32

Yuan Ong, Jing, Yeong Jin King, Lip Huat Saw, and Kai Keng Theng. "Optimization of the Design Parameter for Standing Wave Thermoacoustic Refrigerator using Genetic Algorithm." IOP Conference Series: Earth and Environmental Science 268 (July 2, 2019): 012021. http://dx.doi.org/10.1088/1755-1315/268/1/012021.

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33

Naciri, Mamoun, and Chiang C. Mei. "Bragg scattering of water waves by a doubly periodic seabed." Journal of Fluid Mechanics 192 (July 1988): 51–74. http://dx.doi.org/10.1017/s0022112088001788.

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We extend the recent work on Bragg scattering of water waves by one-dimensional parallel bars of sinusoidal profile to two-dimensional, doubly sinusoidal bed waves. The resonance condition governing the phase matching between the incident, scattered and bed waves is now more complicated and a much richer variety of resonant reflection can occur. In particular, for one normally incident wave there can be two reflected waves forming a standing wave in the transverse direction. Solutions for a wide strip of bed waves are discussed for incident water waves satisfying approximately the Bragg resonance condition. Modifications for a two-dimensional array of hemispheroids are also given. Possible application to the design of submerged breakwaters is suggested.

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34

Meng, Yan Qiu, Guo Ping Chen, and Shi Chang Yan. "Wave-in-Deck Impulsive Pressure on Unsheltered Jetties Exposed to Waves and Current." Applied Mechanics and Materials 256-259 (December 2012): 1928–36. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.1928.

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Impulsive pressure induced by waves is an important factor to be considered in the design of offshore structures. This paper presents results from physical model tests on the impulsive pressure on deck of unsheltered jetties and similar structures exposed to directional waves in the presence of currents. The pressures were measured on a 1:50 scale model of a jetty head with down-standing beams and berthing members. Different incident wave angles, the current velocities and the angles between wave and current were considered to identify the effects of these factors on the impulsive pressures. Data collected from model tests were analyzed to gain insights on the mechanics of the impulsive pressure under different wave and current conditions. It is shown that the impulsive pressure is sensitive to the wave directionality and the current magnitude.

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35

Mohd Ghazali, Normah, Irfan Abd Rahim, Terry Quenet, and Zaki Ab Muin. "Investigation of the Velocity Profiles in a Ninety-Degree Curved Standing Wave Resonator with Particle Image Velocimetry." Applied Mechanics and Materials 388 (August 2013): 8–12. http://dx.doi.org/10.4028/www.scientific.net/amm.388.8.

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Travelling wave thermoacoustic heat engines have been reported to have a higher efficiency than the standing wave ones. The former are generally large systems which consist of toroidal shape resonators. While standing wave heat engines are inherently smaller, a reduction in size could be considered which may involve curvatures as compared to the straight tube conventional systems. However, as with the streaming losses in the travelling wave resonators, losses due to the curvature may be generated. This study involves preliminary experimental measurements using the Particle Image Velocimetry (PIV) method to analyze the velocity profiles in a standing wave resonator before and after a ninety degree curvature. This design can reduce the space generally occupied by the straight standing wave resonator. The overall length of the resonator fits a quarter wavelength wave based on the straight closed-end tube type. The working gas is air at 1 atmospheric pressure. Results have shown that the velocity profiles after the stack but before the curvature exhibit clear straight paths up just as reported elsewhere. Signs of disordered motion could be observed just before the bend and the pattern continues until after the curvature. The results are obtained before one periodic cycle and before the acoustic wave front hit the tube end. The trend is expected to affect the overall thermoacoustic performance of the engine as returning gas particles interact with the oncoming particles that pass by the curvature.

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36

Nwe Zin Tun, Khin, Khine Zin Mar, and Thein Min Htike. "Gravity-Aided Ultrasonic Separation of Nanoparticles from Liquid Using Macro-Scale Separator." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 79, no. 2 (January 15, 2021): 74–82. http://dx.doi.org/10.37934/arfmts.79.2.7482.

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Acoustophoresis is the technology to separate the microparticles and cells from suspending fluid. This research focuses on the separation of nanoparticles from water by using macro-scale fluidic separator which works based on gravity-aided ultrasonic standing wave technology. Titanium dioxide particles of 40 nm diameter were concentrated by the combination of ultrasonic standing wave field at 2.2 MHz and gravity-aided sedimentation. The purpose of this study is to investigate the performance of gravity-aided ultrasonic particle to concentrate nanoparticles. It was found that the separation efficiency is 83% at a flow rate of 0.1 mL/min. FEM simulations were also conducted to evaluate characteristics of variation of acoustic energy inside the fluidic channel. Results indicate that nanoparticles can be concentrated using gravity-aided ultrasonic standing wave field, however optimization of the design of the fluidic channel is required for increasing throughput of the separator.

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37

Liu, Ying Xiang, Jun Kao Liu, Wei Shan Chen, and Sheng Jun Shi. "Design and Analysis of a Ring Type Traveling Wave Ultrasonic Motor Using Cantilever Type Composite Transducer." Advanced Materials Research 79-82 (August 2009): 1411–14. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1411.

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To take advantage of merits of higher output-power and efficiency of bolt-clamped transducer, a ring type traveling wave ultrasonic motor using cantilever type composite transducer is proposed in this paper. In this new design, two cantilevers are set for the coupling between ring and transducer. Two standing bending waves (with phase difference of π/2 on time and space, respectively) are generated in the ring by the bending-longitudinal vibrations of transducer. Thus, a flexural traveling wave can be excited. The working principle of proposed motor is analyzed. The stator is designed and analyzed with FEM, and the motion trajectories of nodes on the teeth are analyzed. The results of transient analysis verify the theoretical feasibility of proposed design. The results of this paper could guide the development of this new type of motor.

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38

Piccolo, A. "Design issues and performance analysis of a two-stage standing wave thermoacoustic electricity generator." Sustainable Energy Technologies and Assessments 26 (April 2018): 17–27. http://dx.doi.org/10.1016/j.seta.2016.10.011.

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39

Schnitta, Bonnie, and Greg Enenstein. "Variations in standing-wave impedance tube design and the effect on the resulting data." Journal of the Acoustical Society of America 132, no. 3 (September 2012): 1978. http://dx.doi.org/10.1121/1.4755296.

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40

Soepriatna, Nicholas, N. H. Linda Wang, and Phillip C. Wankat. "Standing Wave Design and Optimization of Nonlinear Four-Zone Thermal Simulated Moving Bed Systems." Industrial & Engineering Chemistry Research 54, no. 42 (July 20, 2015): 10419–33. http://dx.doi.org/10.1021/acs.iecr.5b01296.

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41

Wu, Feng, Lingen Chen, Anqing Shu, Xuxian Kan, Kun Wu, and Zhichun Yang. "Constructal design of stack filled with parallel plates in standing-wave thermo-acoustic cooler." Cryogenics 49, no. 3-4 (March 2009): 107–11. http://dx.doi.org/10.1016/j.cryogenics.2008.09.009.

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42

Liang, Xiaorui, Yangyanhao Guo, Tianhao Zhou, Lei Zhang, Qiulin Tan, and Jijun Xiong. "Voltage standing wave ratio reading circuit design for inductance capacitance wireless passive ammonia sensors." Review of Scientific Instruments 92, no. 8 (August 1, 2021): 085003. http://dx.doi.org/10.1063/5.0048843.

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43

Ran, Xiao Ying, and Zhen Yu. "Design of Four-Arm Equiangular Spiral Antenna in Mine Communication." Applied Mechanics and Materials 678 (October 2014): 447–51. http://dx.doi.org/10.4028/www.scientific.net/amm.678.447.

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According to the propagation characteristics of radio wave in mine tunnels, in order to realize the communication and detection in underground tunnels, a four-arm equiangular spiral antenna is presented in the paper, which based on the principle and structure of traditional two-arm spiral antenna, and reduces the antenna size. CST software is used to construct and simulate the antenna model. The antenna is tested by the PNA3621 vector network meter. Simulation and measurement results show that the antenna has good performance in 652MHz-3.012GHz frequency range, antenna input voltage standing-wave ratio VSWR and return loss RL are ideal, and antenna pattern is better, which agrees well with the simulated results.

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44

El-Fawal, Mawahib Hassan, Normah Mohd-Ghazali, and Mohd Shafiek Yaccob. "Effects of the Optimized Resonator Dimensions on the Performance of the Standing-Wave Thermoacoustic Refrigerator." Applied Mechanics and Materials 819 (January 2016): 63–68. http://dx.doi.org/10.4028/www.scientific.net/amm.819.63.

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Thermoacoustic refrigerator is an alternative cooling system, which is environmentally safe due to the absence of any refrigerants. The resonator tube of the system is of great importance; its design and dimensions influence the design and performance of the entire refrigerator. This work describes the design of the stack and the resonator along with the influence of its dimensions on the performance of the standing-wave thermoacoustic refrigerator. The resonator consists of two tubes, one larger than the other, characterized by the diameter ratio of the smaller over the larger diameter. A Lagrange multiplier method is used as a technique to optimize the coefficient of performance (COP) of the system. Results show that the resonator small diameter tube dissipates a minimum acoustic power at a diameter ratio of 0.46, which is 17 percent less than the published values. Moreover, the results show that the resonator length increases gradually with the increase of the mean design temperature which leads to the increase of the total acoustic power dissipated by the resonator, reducing the COP of the standing-wave thermoacoustic refrigerator.

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Miyahira, William, Andrew P. Rotunno, ShuangLi Du, and Seth Aubin. "Microwave Atom Chip Design." Atoms 9, no. 3 (August 5, 2021): 54. http://dx.doi.org/10.3390/atoms9030054.

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We present a toolbox of microstrip building blocks for microwave atom chips geared towards trapped atom interferometry. Transverse trapping potentials based on the AC Zeeman (ACZ) effect can be formed from the combined microwave magnetic near fields of a pair or a triplet of parallel microstrip transmission lines. Axial confinement can be provided by a microwave lattice (standing wave) along the microstrip traces. Microwave fields provide additional parameters for dynamically adjusting ACZ potentials: detuning of the applied frequency to select atomic transitions and local polarization controlled by the relative phase in multiple microwave currents. Multiple ACZ traps and potentials, operating at different frequencies, can be targeted to different spin states simultaneously, thus enabling spin-specific manipulation of atoms and spin-dependent trapped atom interferometry.

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Jiang, Chunrong, Xiaoxiao Dong, Long Jin, and Danhong Lu. "Contact Modeling and Performance Evaluation of a Radial Standing Wave Ultrasonic Motor." Mathematical Problems in Engineering 2019 (May 19, 2019): 1–10. http://dx.doi.org/10.1155/2019/1093108.

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The focus of this paper is to propose a contact model of a radial standing wave ultrasonic motor in order to evaluate the motor performance accurately. The contact behavior between the stator and rotor is characterized by test and a continuous contact on the contact interface is confirmed. A contact model describing the continuous contact is then developed with analytical method. The stator vibration, the force transmission between the stator and rotor, and the output of the motor are analyzed. The impacts of different vibration amplitudes and structural parameters on the performances of the motor are evaluated based on the proposed model. Finally, a test platform for measuring the performance of the motor is built and torque-speed curves of the motor under different voltages are measured. The accuracy of the contact model is verified by comparison between measurement and calculation results. The proposed model not only can be used for design and optimization of the radial standing wave ultrasonic motor but also offers insight into the contact mechanics of standing wave ultrasonic motors.

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Lee, Y. S., and J. H. Kwon. "A smart device for particle separation in water using ultrasonic standing waves." Water Supply 6, no. 1 (January 1, 2006): 173–83. http://dx.doi.org/10.2166/ws.2006.022.

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This paper presents the theory, design, and evaluation of a smart device for the enhanced separation of particles mixed in fluid. The smart device takes advantage of the ultrasonic standing wave, which was generated by the operation of a piezoceramic PZT patch installed in the smart device. The details of the device design including the electro-acoustical modelling for separation and PZT transducer are described. Based on this design, the separation device was fabricated and evaluated. In the experiments, an optical camera with a zoom lens was used to monitor the position of interested particles within the separation channel layer in the device. The electric impedance of the PZT patch bonded on the separation device was measured. The device shows a strong levitation and separation force against 50 μm diameter particles mixed with water at the separation channel in the device. Experimental results also showed that the device can work with both heavy and light sand particles mixed with water due to the generated standing wave field in the separation channel.

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Azizi, Sanae, Laurent Canale, Saida Ahyoud, Georges Zissis, and Adel Asselman. "Design of Transparent Antenna for 5G Wireless Applications." Proceedings 63, no. 1 (December 28, 2020): 54. http://dx.doi.org/10.3390/proceedings2020063054.

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This paper presents the design of a compact size band patch antenna for 5G wireless communications. This wideband antenna was designed on a glass substrate (12 × 11 × 2 mm3) and is optically transparent and compact. It consists of a radiation patch and a ground plane using AgHT-8 material. The antenna design comprises rectangular shaped branches optimized to attain the wideband characteristics. The calculated impedance bandwidth is 7.7% covering the frequency range of 25 to 27 GHz. A prototype of the antenna and various parameters such as return loss plot, gain plot, radiation pattern plot, and voltage standing wave ratio (VSWR) are presented and discussed. The simulated results of this antenna show that it is well suited for future 5G applications because of its transparency, flexibility, light weight, and wide achievable frequency bandwidth near the millimeter wave frequency band.

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Subedi, Upendra, Rabin Nepal, Rhimesh Lwagun, and Sanjay Rijal. "Design of Log Periodic Dipole Array Antenna Ranging from 30 to 150 MHz." Journal of Innovations in Engineering Education 3, no. 1 (March 31, 2020): 175–83. http://dx.doi.org/10.3126/jiee.v3i1.34341.

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This paper describes construction of 16 element frequency independent and high bandwidth Log Periodic Dipole Array antenna which works within the frequency range of 30 to 150 MHz. The antenna of gain 8 dBi is designed by calculating the parameters from Matlab. Matlab program is used to calculate the parameters like length of elements, separation between elements, theoretical impedance, standing wave ratio, etc. Thus, the designed antenna was fabricated. The antenna element is a cylindrical aluminum pipe of diameter 9mm and the boom used is rectangular antenna pipe of dimension 1”X1”. Fabrication also includes other materials like M-seal, zip tie, etc for physical stability of the antenna. Log Periodic Dipole Array antenna design described in this paper is fed with 75 ohm coaxial cable to 1:1 balun. Balun is also used for impedance matching between the antenna and coaxial cable. Antenna analyzer is used to measure Standing Wave Ratio and Impedance which are found to be 1.623 and 71.5625 ohm respectively. The antenna can be a receiver or a transmitter type for operating with the signals within Very High Frequency band.

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He, Juntao, Yibing Cao, Jiande Zhang, Ting Wang, and Junpu Ling. "Design of a dual-frequency high-power microwave generator." Laser and Particle Beams 29, no. 4 (December 2011): 479–85. http://dx.doi.org/10.1017/s0263034611000590.

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AbstractA new direction for high-power microwave (HPM) development is to investigate devices capable of producing HPMs with a complicated spectrum. In recent years, some HPM sources with two stable and separate frequencies have been investigated theoretically and experimentally. However, many short-comings still exist in these devices. Especially, the beam-wave interaction efficiency and the output microwave power are low in such devices. This paper proposes a novel dual-frequency HPM generator based on transition radiation. In the device, the electromagnetic fields are localized near the resonator cavities in the form of standing waves, and thus the interference between the different HPM components with different frequencies is weak. Compared with the existing dual-frequency devices, the new structure allows high beam-wave interaction efficiency and high output microwave power. As indicated in particle-in-cell simulation, with an electron beam of 500 kV voltage and 15.0 kA current guided by a magnetic field of 0.8 Tesla, an average power of 1.60 GW with a total power conversion efficiency of 21.3% is obtained, and the frequencies are 1.53 GHz and 3.29 GHz, respectively. Power level between two HPMs is comparable. The simulation results verify the feasibility of the dual-frequency HPM generator.

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