Results 11 to 20 of about 145,247 (288)
Foods, 2021 Many methods based on acoustic vibration characteristics have been studied to indirectly assess fruit ripeness via fruit firmness. Among these, the frequency of the 0S2 vibration mode measured on the equator has been examined, but soft-flesh fruit do not
Nayuta Arai +4 more
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Research and application of Rayleigh wave extraction method based on microtremors signal analysis
Frontiers in Physics, 2023 This study investigates the method and application of single-channel, three-component microtremor signal co-directional Rayleigh surface-wave extraction.
Qingling Du +3 more
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Rayleigh wave manipulation based on phase shift between two periodic surface corrugations
Results in Physics, 2023 The propagation of Rayleigh waves along solid surfaces has attracted great attention due to its ubiquity in seismic waves, non-destructive evaluation, acoustic surface wave devices, and so on.
Qiao-Mu Zhang +6 more
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Multiple wavemode scanning for near and far-side defect characterisation [PDF]
, 2020 The combination of ultrasonic inspections using different wavemodes can give more information than is available with single mode inspection. In this work, the response of shear and Rayleigh waves to surface-breaking defects propagating on the near-side ...
Edwards, R. S. (Rachel S.), Xiang, L.
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A review on microtremor H/V spectral ratio method
地球与行星物理论评, 2021 The microtremor H/V spectral ratio is the ratio of the horizontal component to the vertical component of the ambient seismic noise at different frequencies, recorded at the earth surface.
Tongwei Qin +3 more
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Acoustic power measurements of oscillating flames [PDF]
, 1981 The acoustic power of an oscillating flame is measured. A turbulent premixed propane/air flame is situated near a pressure antinode of a standing wave in a laboratory combustion chamber. This standing wave is generated by a piston.
Valk, M.
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Phased electromagnetic acoustic transducer array for Rayleigh wave surface defect detection [PDF]
, 2020 A phased electromagnetic acoustic transducer (EMAT) array system has been developed for detection and characterisation of surface breaking defects. An array of four linear coils which are individually controlled are used to generate a Rayleigh wave.
Dixon, S. +3 more
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Viscoelastic Rayleigh waves II [PDF]
Quarterly of Applied Mathematics, 1978 The number of possible surface waves on a viscoelastic half-space is investigated numerically as a function of the material parameters. The results are applied to simple theoretical models of viscoelastic behavior and also to experimental data. It is concluded that two surface waves are possible on some rocks and on nearly all solid polymers.
Currie, P. K., O'Leary, P. M.
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Non-linear enhancement of laser generated ultrasonic Rayleigh waves by cracks [PDF]
, 2008 Laser generated ultrasound has been widely used for detecting cracks, surface and sub-surface defects in many different materials. It provides a non-contact wideband excitation source which can be focused into different geometries.
Cann, B. +4 more
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Rayleigh–Taylor shock waves [PDF]
Physics of Fluids, 2007 Beginning from a state of hydrostatic equilibrium, in which a heavy gas rests atop a light gas in a constant gravitational field, Rayleigh–Taylor instability at the interface will launch a shock wave into the upper fluid. We have performed a series of large-eddy simulations which suggest that the rising bubbles of light fluid act like pistons ...
Olson, B J, Cook, A W
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