Locally resonant sonic materials science
Witryna1 sie 2006 · The acoustic properties of locally resonant sonic materials with viscosity are theoretically investigated by using the multiple-scattering approach. We find that the absorption of a two-layer slab dominates the wave attenuation in the resonant frequency region under the condition of moderate or high viscous level. ... Liu Z Y et al 2000 … WitrynaThese materials have an effective dynamic modulus with negative values near the resonance frequency. As a result, these ultrasonic metamaterials can convey acoustic waves with a group velocity antiparallel to phase velocity, as observed experimentally. On the basis of homogenized-media theory, we calculated the dispersion and …
Locally resonant sonic materials science
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WitrynaLocally resonant sonic materials. We have fabricated a new type of composite which displays localized sonic resonances at ∼350- 2000 Hz with a microstructure size in the millimeter to centimeter range. Around the resonance frequencies the composite behaves as a material with effective negative elastic constants and as a total wave … WitrynaLocally Resonant Sonic Materials. We have fabricated sonic crystals, based on the idea of localized resonant structures, that exhibit spectral gaps with a lattice constant …
Witryna1 wrz 2010 · This research was financially supported by the National Authority for Scientific Research (ANCS, UEFISCSU), Romania, through PN2 project 106/2007, … Witryna1 dzień temu · Non-auditory physiological effects or injuries that theoretically might occur in marine mammals exposed to high level underwater sound or as a secondary effect of extreme behavioral reactions ( e.g., change in dive profile as a result of an avoidance reaction) caused by exposure to sound include neurological effects, bubble formation, …
Witryna26 kwi 2024 · Based on the previous studies on the stubbed-on locally resonant phononic crystal (LRPC) double panel structure (DPS) made of a two-dimensional periodic array of a two-component cylindrical LR pillar connected between the upper and lower plates, the stubbed-on LRPC DPS with soft shell surrounded and simplified … Witryna19 wrz 2012 · 3 Swiss Federal Laboratories for Materials Science and Technology, EMPA, Dübendorf, Switzerland; a) F. Casadei and T. Delpero contributed equally to this work. b) Electronic mail: [email protected]. ... “Elastic wave propagation in locally resonant sonic material: ...
Witryna13 maj 2024 · We present an acoustic metamaterial (AMM) consisting of a dumbbell-shaped split hollow sphere (DSSHS). Transmission results of experiments and simulations both presented a transmitted dip at the resonant frequency of AMM, which demonstrated its negative modulus property. As the two split holes in the DSSHS had …
Witryna12 kwi 2024 · Purpose: In our experience treating locally advanced pancreatic cancer (PC) with magnetic resonance-guided radiation therapy (MRgRT), the true-fast imaging with steady-state free precession (TRUFI) sequences used to generate real-time 2D MRI (2D cine) impart differing intensities for relevant structures when compared to the pre … periods on nexplanonWitrynaWe demonstrate a class of sonic shield materials based on the principle of locally resonant (LR) microstructures. Each local resonator is found to vibrate almost like an independent unit, and two layers of such resonators can even be … periods on hrt treatmentWitryna8 wrz 2000 · We have fabricated sonic crystals, based on the idea of localized resonant structures, that exhibit spectral gaps with a lattice constant two orders of magnitude … periods on resume bulletsWitrynaA method is introduced to study the transmission and scattering properties of acoustic waves in two–dimen- sional phononic band gap (PBG) materials. First, it is used to calculate the transmission coefficients of PBG samples. Second, the transmitted power is calculated based on the far field approach. We have also calcu- lated the scattering … periods once a yearWitryna8 sty 2024 · The locally resonant units are attached periodically on the rail, forming a new locally resonant phononic crystal structure. ... Locally resonant sonic materials [J]. Science, 2000, 289(5485): 1734–1736. Article Google Scholar ZHENG Ling, LI Yi, BAZ A. Attenuation of wave propagation in a novel periodic structure [J]. Journal of … periods only lasting 2 daysperiods on the pillWitryna1 paź 2003 · Abstract. We have fabricated a new type of composite which displays localized sonic resonances at ∼350– 2000 Hz with a microstructure size in the … periods on periodic table are