Relevant bibliographies by topics / Perforation impedance

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Perforation impedance'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Perforation impedance"

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Thornton, CurtisLee, and JungHun Choi. "Design of an Impedance-Controlled Hot Snare Polypectomy Device." Sensors 20, no. 1 (2019): 142. http://dx.doi.org/10.3390/s20010142.

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This paper goes through the process of first designing a feedback system that allows for the measuring of impedance while using the hot snare polypectomy method. The electrosurgical unit used in this study was the Olympus PSD-30. After the impedance-controlled feedback system was completed, the device was tested under a range of power settings from 10 W–50 W. The test was performed ex vivo using porcine colon samples. Using the information gathered from these tests, a technique of determining the threshold of perforation and implementing a system to automatically stop the applied current from
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Qian, Yu Jie, Ke Cui, Shu Mei Liu, Zi Bo Li, De Yi Kong, and Shao Ming Sun. "Development of Broadband Ultra Micro-Perforated Panels Based on MEMS Technology." Applied Mechanics and Materials 535 (February 2014): 788–95. http://dx.doi.org/10.4028/www.scientific.net/amm.535.788.

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Fabrication process of ultra micro-perforated panels (ultra-MPPs) with perforations of diameter below 100 um based on MEMS technology is expatiated in this paper. As a promising alternative to the conventional porous absorbing materials, MPP absorber is now being widely used in noise control engineering. Theory reveals that the maximum sound absorption bandwidth of a single MPP absorber could be achieved by reducing the perforation diameter to a certain limit and the desirable perforation diameters are less than 100um under many circumstances. However, due to the limitation of traditional manu
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Atiénzar-Navarro, Roberto, Romina del Rey, Jesús Alba, Víctor J. Sánchez-Morcillo, and Rubén Picó. "Sound Absorption Properties of Perforated Recycled Polyurethane Foams Reinforced with Woven Fabric." Polymers 12, no. 2 (2020): 401. http://dx.doi.org/10.3390/polym12020401.

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The acoustic properties of recycled polyurethane foams are well known. Such foams are used as a part of acoustic solutions in different fields such as building or transport. This paper aims to seek improvements in the sound absorption of these recycled foams when they are combined with fabrics. For this aim, foams have been drilled with cylindrical perforations, and also combined with different fabrics. The effect on the sound absorption is evaluated based on the following key parameters: perforation rate (5% and 20%), aperture size (4 mm and 6 mm), and a complete perforation depth. Experiment
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Yuvaraj, L., and S. Jeyanthi. "Acoustic performance of countersunk micro-perforated panel in multilayer porous material." Building Acoustics 27, no. 1 (2019): 3–20. http://dx.doi.org/10.1177/1351010x19886588.

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This study investigates the acoustic performance of a countersunk micro-perforated panel, along with two distinct porous materials used in a multilayer porous absorber configuration. Additive manufacturing is applied to create sub-millimeter perforation with different hole spacings on polymer micro-perforated panels. Experiments are conducted in an impedance tube, in which the effects of the perforation ratio, air gap, and varying porous layer configurations on the sound absorption capabilities are investigated. For validation, considering the converging hole profile in the micro-perforated pa
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ZHU, F., S. HEDLUND, and D. THIERRY. "Application of electrochemical impedance spectroscopy to study perforation corrosion of automotive materials." British Corrosion Journal 31, no. 2 (1996): 113–18. http://dx.doi.org/10.1179/bcj.1996.31.2.113.

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R., Zulkifli, T. K. Thye, Mohd Faizal Bin Mat Tahir, Ahmad Rasdan Ismail, and Mohd Jailani Mohd Nor. "Automotive Noise Insulation Composite Panel Using Natural Fibres with Different Perforation Areas." Applied Mechanics and Materials 165 (April 2012): 63–67. http://dx.doi.org/10.4028/www.scientific.net/amm.165.63.

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This research was carried out to study the acoustic properties of natural organic fibres; kenaf and coir fibres using impedance tube method. Kenaf fibre was used as noise absorber filler in an insulation panel while the coir fibre as reinforcement in the perforated composite panel. The perforated panel was made from coir fibre/polyester composites with coir fibre volume fraction of 10%, 20% and 30%. The perforation area of the perforated panel was also varied at 10%, 20% and 30%. During the processing stage, the kenaf fibre sheet has been treated with PVA and cut into 100 mm and 30 mm diameter
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Li, Chenxi, Ben Cazzolato, and Anthony Zander. "Acoustic impedance of micro perforated membranes: Velocity continuity condition at the perforation boundary." Journal of the Acoustical Society of America 139, no. 1 (2016): 93–103. http://dx.doi.org/10.1121/1.4939489.

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AKISHITA, Sadao. "2713 Grazing Flow Effect on Surface Impedance with Very Small Bore : Rectangular Perforation." Proceedings of the JSME annual meeting 2008.7 (2008): 107–8. http://dx.doi.org/10.1299/jsmemecjo.2008.7.0_107.

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Lee, Iljae, Ahmet Selamet, and Norman T. Huff. "Impact of perforation impedance on the transmission loss of reactive and dissipative silencers." Journal of the Acoustical Society of America 120, no. 6 (2006): 3706–13. http://dx.doi.org/10.1121/1.2359703.

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Vašina, Martin, and Ondrej Bilek. "Influence of Surface Shape and Perforation of Plastics on Sound Absorption." Applied Mechanics and Materials 474 (January 2014): 393–98. http://dx.doi.org/10.4028/www.scientific.net/amm.474.393.

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The aim of the paper is to study the effect of the surface shape and perforation of plastics on sound absorption. Samples with different asperity heights, depths and numbers of holes were prepared by means of CNC milling machine. Experimental measurements of frequency dependencies of the sound absorption coefficient were realized by the transfer function method using Kundt ́s impedance tube at normal incidence of acoustic wave on the investigated materials. The study was performed on two types of polyurethanes. Different factors, that have influence on sound absorption, are evaluated in the co
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Dissertations / Theses on the topic "Perforation impedance"

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Kiley, Erin M. "A Computational Approach to Determining the Intrinsic Impedance of Perforated Metal Sheets." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/724.

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Perforated metal sheets are frequently used in electric and electronic devices, and in most cases, these metal structures should comply with some electromagnetic compatibility constraints which impose certain conditions on penetrating electromagnetic radiation, quality of shielding, and other characteristics. Currently, many issues in electronic system design could be handled with advanced mathematical and computer models; however, direct reproduction of perforation in these models may result in a significantly increased computational cost. This work is concerned with modeling perforated metal
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Lee, Iljae. "Acoustic characteristics of perforated dissipative and hybrid silencers." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1117631229.

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Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formatted into pages; contains xvi, 195 p.; also includes graphics. Includes bibliographical references (p. 183-195). Available online via OhioLINK's ETD Center
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Huang, Botao. "Mécanismes de vieillissement de l'Assemblage-Membrane-Électrodes dans une pile à combustible de type PEM par approche expérimentale." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0268/document.

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Cette thèse a permis de mettre en évidence les mécanismes de vieillissement de la pile à combustible de type PEM lors de cyclages d'humidité de l'air et suite à la perforation de l'AME (Assemblage Membrane Electrodes). Premièrement, les mécanismes connus de dégradation des divers composants (membrane, catalyseur, support du catalyseur, GDL, plaques bipolaires et joints d'étanchéité) ont été présentés. Ensuite, les outils de diagnostic en-ligne (chronopotentiométrie, spectroscopie d'impédance, gestion de l'eau et analyse chimique de l'eau) et ceux hors-ligne (CV et LSV) ainsi que des analyses p
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Conference papers on the topic "Perforation impedance"

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Mazdeh, Alireza, and Reza Kashani. "The Impact of Perforation Geometry on Acoustic Damping Attributes of a Perforated Liner With Bias Flow." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69727.

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Acoustic damping properties of perforated liners are highly dependent on a number of variables which can be categorized as “flow variables” such as the extent and Mach number of grazing flow as well as bias flow and “geometric variable” such as the shape of the hole which can be rectangular, cylindrical, conical with diverging or converging nozzle, thickness to radius ratio, radius to hole spacing ratio and hole orientation which can be normal to or inclined with respect to the perforated plate. Many of these variables were not incorporated in previous studies. Theoretical and empirical approa
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Mazdeh, Alireza, and Ahmad Reza Kashani. "Numerical Modeling of the Acoustic Damping of Perforated Liners With Bias Flow." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62629.

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Acoustic damping properties of perforated liners are highly dependent on a number of variables which can be categorized as “flow variables” such as the extent and Mach number of grazing flow as well as bias flow and “geometric variable” such as the shape of the hole which can be rectangular, cylindrical, conical with diverging or converging nozzle, thickness to radius ratio, radius to hole spacing ratio and hole orientation which can be normal to or inclined with respect to the perforated plate. Theoretical and empirical approaches have provided the foundation for understanding the damping pro
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Andreini, A., C. Bianchini, B. Facchini, F. Simonetti, and A. Peschiulli. "Assessment of Numerical Tools for the Evaluation of the Acoustic Impedance of Multi-Perforated Plates." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-46303.

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Multi-perforated liners, commonly employed in Gas Turbine combustors as cooling devices to control metal temperature, are recognized as very effective sound absorbers. Thus, in the innovative lean combustion technology, where the onset of thermoacoustic instabilities represents one of the most important issue, the multi-perforated plates can be exploited both for wall cooling and damping combustion instabilities. As a first step of a large experimental and numerical research program regarding multi-perforated liners, an investigation of different numerical methodologies to analyze acoustic dam
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Hebert, Roddy, Rojelio Medina, JC Pinkett, and Tyler Costa. "UTILIZING ULTRASONIC AND PULSED-EDDY CURRENT TECHNOLOGIES TO MAP THE LOCATION OF FIBER-OPTIC CABLE AND CLAMPS: A CASE STUDY." In 2021 SPWLA 62nd Annual Logging Symposium Online. Society of Petrophysicists and Well Log Analysts, 2021. http://dx.doi.org/10.30632/spwla-2021-0111.

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In an ongoing attempt to learn more about subsurface conditions before and during production, service companies and operators have explored a wide range of technologies. One technology, that allows for transmission of subsurface data back to the surface, is the installment of fiber optic cable behind casing. Fiber optic cable not only provides subsurface data conditions affecting production, but it serves as a highway for data transmission in seismic surveys, as well as, monitoring production information itself along the entire length of the cable. We will expand on methods used to preserve th
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Akishita, Sadao, Shoji Yamada, and Seiji Nakashima. "Grazing Flow Effect on Surface Impedance with Circular Perforations of Small Diameters." In 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference). American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-2806.

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Jayatunga, Charith, Qin Qin, Victoria Sanderson, Phil Rubini, Danning You, and Werner Krebs. "Absorption of Normal-Incidence Acoustic Waves by Double Perforated Liners of Industrial Gas Turbine Combustors." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68842.

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Perforated liners consist of sheet metal perforated with multiple holes with diameters of magnitude in the order of millimeters and regular spacing, backed by an air cavity in front of a rigid wall. This type of liner is very effective at absorbing sound and is used in many applications. At the resonance frequency, the liner shifts the phase of the incident wave by 180° thus providing damping through wave cancellation. The perforations in the liner convert acoustic energy into flow energy through vortex shedding at the rims of the liner apertures. Applied to gas turbine combustors they can att
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