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VERSION:2.0
X-WR-CALNAME:DAGA 2020
METHOD:PUBLISH
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TZID:Europe/Paris
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DTSTART:19810329T020000
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BEGIN:VEVENT
CREATED:19700101T000000Z
UID:273
DTEND;TZID=Europe/Paris:20260326T102000
TRANSP:OPAQUE
SUMMARY:DAGA 2020
DTSTART;TZID=Europe/Paris:20260326T100000
DTSTAMP:20260326T100000Z
SEQUENCE:1
DESCRIPTION: Thomas Blaudeck --- Based on extensive numerical simulations and first validating experiments, we present a two-dimensional phononic crystal \ndesign that exhibits exceptionally large complete band gaps, comparable to those of bubble crystals. Building on the analogy \nbetween electronic band structures in solids and acoustic wave propagation in periodic media, we introduce the concept of \nFunction Phononic Crystals: a bulk structure characterized by spatially continuous material parameters rather than discrete \nboundaries. Numerical simulations reveal that a sawtooth-like variation of these parameters produces extensive frequency \ngaps and flat bands. Remarkably, this band structure can be closely replicated by a much simpler geometry composed of \ncylindrical inclusions that touch at single points, effectively forming a broadband acoustic filter. Analysis of the acoustic density \nof states shows that even minor deviations from the conventional step-function profile lead to rapid convergence toward the \ncontinuous case. Experimental acoustic frequency response measurements on an easy-to-assemble two-dimensional array of \nparrafin candles confirm the predicted broadband sound isolation and validate the numerical results. Our findings demonstrate \nthat complex continuous material distributions can be replaced by simple discrete structures with equivalent spectral \nproperties, enabling efficient, experimentally accessible phononic crystal designs with the potential of a strong sound \nattenuation and a practical application potential.\n
LOCATION:Konferenz 2
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