Results 31 to 40 of about 22,518 (261)
Acoustic Energy Harvesting of Piezoelectric Ceramic Composites
Energies, 2022 Acoustic energy is an often overlooked but increasingly prevalent source of ambient energy that could be scavenged to power a wide range of devices. Piezoelectric materials are often used, but the tradeoff between acoustic impedance matching and the ...
Jose Figueroa, Margo Staruch
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Improving APT Systems’ Performance in Air via Impedance Matching and 3D-Printed Clamp
Sensors, 2023 This paper presents a study on improving the performance of the acoustic piezoelectric transducer system in air, as the low acoustic impedance of air leads to suboptimal system performance.
Liu Liu, Waleed Abdulla
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ResearchImpedance metasurfaces enable accurate regulation of acoustic fields. However, they can hardly supply a flexible response as such perfect operation is accompanied by stringent requirements on the design of unit cells.
Yu-Ze Tian +4 more
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Click emission in Dall's porpoise Phocoenoides dalli, focusing on physical properties of tissues. [PDF]
PLoS ONE, 2018 Dall's porpoise (Phocoenoides dalli) is one of most common North Pacific porpoise species, for which information on sound-emitting processes is limited.
Mika Kuroda +5 more
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Machines, 2022 In order to apply the nonlinear energy sink (NES) to reduce the low-frequency noise inside a 3D acoustic cavity with an impedance boundary, a two degrees-of-freedom (DOF) dynamic model of the coupled system of one damped acoustic mode of a regular 3D ...
Jianwang Shao +3 more
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Acoustic Impedance Study of Peritubal Myoclonus
Acta Oto-Laryngologica, 2002 An audible clicking sound coexistent with the contractions of the peritubal muscles is thought to be an isolated form of palatal myoclonus that presents with myoclonal contractions of the soft palate, larynx, pharynx and, sometimes, cervicofacial area.
Yetiser, S., Kazkayasi, M., Civitci, D.
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On Wave Impedance and Specific Impedance of Materials in Acoustics [PDF]
The Journal of the Acoustical Society of America, 1956 If impedance is defined as an operator that permits one to go from an “effect” back to a “cause” (in hydrodynamics, from velocity to pressure), it is seen that the impedance field of a wave is constant in the case of a plane wave, but only in this case.
Théodore Vogel, Gaston Laville
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Advanced Engineering Materials, EarlyView.This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal +2 more
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Design and experimental evaluation of a travelling wave thermoacoustic engine
Energy Reports, 2020 In a thermoacoustic engine, acoustic impedance plays a key role to improve the system performance. A matching stub is a component which can be applied to adjust the acoustic impedance.
Patcharin Saechan, Isares Dhuchakallaya
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Current Status and Challenges in Data Collection for Aerospace Coatings Deposited by Plasma Spraying
Advanced Engineering Materials, EarlyView.An innovative approach has been integrated into the GRENAT project to optimize plasma spraying and coating performance. Raw materials are accelerated and melted in the plasma generated by torches, creating coatings. Monitoring sensors collect process data which are combined with ex situ characterization data.
Lila Randriamananjara +8 more
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