Results 31 to 40 of about 1,265,505 (345)
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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ON THE USE OF ACOUSTIC IMPEDANCE VALUES TO DETERMINE SEDIMENT PROPERTIES
Acoustic Classification and Mapping of the Seabed 1993,/ Numerous systems have been developed over the past 25 years for remote classification of sediments. The generation of acoustic impedance as a function of depth is the principle behind operation of most normal-incidence acoustic classification systems.
M. Richardson, K. Briggs
semanticscholar +1 more source
Tapered transmission line technique based graded matching layers for thickness mode piezoelectric transducers [PDF]
, 2009 Conventionally, in order to acoustically match thickness mode piezoelectric transducers to a low acoustic impedance load medium, multiple quarter wavelength (QW) matching layers are employed at the front face of the device.
Hayward, Gordon +6 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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Influence of viscoelasticity and interfacial slip on acoustic wave sensors [PDF]
, 2000 Acoustic wave devices with shear horizontal displacements, such as quartz crystal microbalances (QCM) and shear horizontally polarised surface acoustic wave (SH-SAW) devices provide sensitive probes of changes at solid-solid and solid- liquid interfaces.
Cowen, JA +3 more
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Measurement of Acoustic Impedance [PDF]
The Journal of the Acoustical Society of America, 1939 Apparatus developed for determining acoustic impedance will be described and demonstrated. The device is the acoustical equivalent of an electrical transmission line.
R. D. Fay, W. M. Hall
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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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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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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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Ultra-Broadband Sound Absorbing Materials Based on Periodic Gradient Impedance Matching
Frontiers in Materials, 2022 Ultra-broadband sound absorption with periodic gradient impedance matching is of great concern in the research of acoustic materials. This study investigates the impedance matching of composite acoustic metamaterials comprising micro-perforated plates ...
Fei Wu +7 more
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