In order to provide an acoustically transparent member that has an acoustically transparent band with an appropriate extent in a high frequency region and assures constant strength, an acoustically transparent member 10 is so configured that a core layer 104 is laminated between two skin layers 102A and 102B, and the skin layers 102A and 102B are formed of material with a higher degree of elasticity than a degree of elasticity of the core layer 104. A thickness ds of the skin layers satisfies the following formula (1) with respect to a center frequency f of a transparent frequency band, a sound velocity cw inside a medium surrounding the acoustically transparent member 10, a wavelength λ corresponding to the center frequency inside the medium, a longitudinal wave sound velocity cds inside the skin layers, and any natural number n.
Acoustically transparent member and method for designing same
2020-04-23
Patent
Elektronische Ressource
Englisch
IPC: | B32B LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM , Schichtkörper, d.h. aus Ebenen oder gewölbten Schichten, z.B. mit zell- oder wabenförmiger Form, aufgebaute Erzeugnisse / B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS / G01S RADIO DIRECTION-FINDING , Funkpeilung |
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