Locally resonant sonic materials insite:cnki
WitrynaAs China accelerates the implementation of the marine power strategy, the demand for advanced underwater sound-absorbing materials has become increasingly urgent. Unlike air absorption, the high hydrostatic pressure and complex marine environment impose more stringent requirements regarding underwater sound-absorbing … Witryna1.5 Multi-layer locally resonant structures In layered LRS arrangements the layers are elastically connected in series, which can be represented in one dimension by a spring element known as the ...
Locally resonant sonic materials insite:cnki
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WitrynaSonic crystals are artificial structures consisting of a periodic array of acoustic scatterers embedded in a homogeneous matrix material, with a usually large impedance … 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 …
Witrynamaterials. [1 3] The fo cus has b een extended to the study of comp osite m ultipla y er panels with phononic-crystal c haracteristics. [4 19] This is of in terest for ap-plications … Witryna7 wrz 2024 · It can be seen that, when the vibration frequency is away from the locally resonant frequency of the LRUC, the dynamic mass density of the wave-resistance sleeper is close to the static one; however, it will suddenly decrease to a negative value as the vibration frequency is close to the locally resonant frequency of the LRUC.
Witrynacells. Its resonant frequency, as seen in Fig. 2(b), is at 490 Hz. Sample-4 consists of 16 mm lead balls (23.0 g) and its resonant frequency is at 360 Hz. Sample-5 consists of 19 mm steel balls (28.4 g) and its resonant frequency is at 270 Hz. The three samples were then stacked together to form effective broad band low frequency sound shield. Witryna1.5 Multi-layer locally resonant structures In layered LRS arrangements the layers are elastically connected in series, which can be represented in one dimension by a …
WitrynaWe have fabricated a new type of composite which displays localized sonic resonances at ∼350–2000Hz with a microstructure size in the millimeter to centimeter range. …
Witrynamaterials. [1 3] The fo cus has b een extended to the study of comp osite m ultipla y er panels with phononic-crystal c haracteristics. [4 19] This is of in terest for ap-plications in lo w frequency barriers. [20; 21] The lo cally resonan t sonic material (LRSM) re-searc h area has been op ened in the eld of phononic bandgap materials since ... palani temple contact noWitryna8 wrz 2000 · Note the expanded scale near the G point. - "Locally resonant sonic materials" Fig. 1. (A) Cross section of a coated lead sphere that forms the basic … palan manuel à chaîneWitryna1 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 … pal annexWitryna21 lip 2024 · We then extend the framework to locally resonant periodic structures to explore the implications of this phenomenon on bandgap tunability. We show that the tuning capability is available if the cubic nonlinearity is deployed in the internal springs supporting the resonators. ... 2000 Locally resonant sonic materials. Science 289, … palan monorail 2 tonnesWitrynaA locally resonant sonic material (LRSM) is an elastic matrix containing a periodic arrangement of identical local resonators (LRs), which can reflect strongly near their … palan mécaniqueWitryna25 sty 2024 · Abstract. The so-called locally resonant acoustic metamaterials (LRAMs) are a new kind of artificially engineered materials capable of attenuating acoustic waves. As the name suggests, this phenomenon occurs in the vicinity of internal frequencies of the material structure and can give rise to acoustic bandgaps. One possible way to … palan pneumatiqueWitrynatic absorption of viscoelastic slabs embedded with resonant sonic materials.[12] Their theoretical and experimental stud-ies indicate that locally resonant sonic materials have an out-standing performance of sound absorption. Wen et al. later used finite element method (FEM) to reveal the absorption mechanism.[13] palani tourist places