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Vpliv frekvence zvoka na zvočno izolativnost določeno na nestandardnem preizkuševališču
Kranjec, Urban (Author), Govekar, Edvard (Mentor) More about this mentor... This link opens in a new window, Emri, Igor (Co-mentor)

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Abstract
Zvočno izolativnost po standardu ISO 10140 merimo pri vzbujanju z belim šumom. Hrup pa v realnih situacijah v vsakdanjem življenju ne vsebuje celotnega frekvenčnega spektra – izpostavljeni smo le določenem frekvenčnem območjem. Iz tega razloga se pojavlja vprašanje ali frekvenca oziroma frekvenčni spekter vira zvoka vpliva na izmerjeno zvočno izolativnost materialov. Meritve sem izvajal na nestandardnem preizkuševališču za merjenje zvočne izolativnosti v Centru za Eksperimentalno Mehaniko (CEM), ki posnema standardno meritev, vendar je izvedena v omejenem prostoru. Uporabil sem tri materiale, ki so se razlikovali v mehanskih lastnostih kot tudi v stukturi. Ugotovil sem, da frekvenca zvočnega valovanja, s katero vzbujamo vzorec, vpliva na izmerjeno zvočno izolativnost materiala pri merjenju na prej omenjenem preizkuševališču. Pri vzbujanju z nižjimi frekvencami zvoka (500 Hz) smo izmerili večjo zvočno izolativnost pri vseh treh materialih v primerjavi z zvočno izolativnostjo vzbujanju z belim šumom. Pri vzbujanju z višjimi frekvencami (1000 Hz in 5000 Hz) pa so se odstopanja rezultatov razlikovala in ni bilo mogoče povzeti določenega trenda.

Language:Slovenian
Keywords:zvočna izolativnost, nestandardno preizkuševališče, frekvenca vzbujanja, raven zvočnega tlaka
Work type:Bachelor thesis/paper (mb11)
Organization:FS - Faculty of Mechanical Engineering
Year:2017
Views:356
Downloads:236
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Secondary language

Language:English
Title:The influence of the sound frequency on the sound insulation defined on the non-standard measuring setup
Abstract:
When measuring sound insulation according to the standard ISO 10140, the tested sample is exposed to white noise. The noise coveres the whole spectrum of frequencies, contrary, in real situations we are usually exposed only to noise in certain frequency range. Because of that, we study the influence of the sound source frequency on the sound insulation measured on the non-standard measuring setup. All the measurements were performed on non-standard measuring setup developed at CEM. The setup simulates a standard measuring setup but it is built in a smaller scale. The results showed that the frequency of the excitation noise influences measured results. When tested samples were exposed to a lower frequency (500 Hz) measured sound insulation was higher then it ras measured using white noise as sound source. However, when exposing the tested samples to a higher frequency (1000 Hz and 5000 Hz) results did not show any specific trend.

Keywords:sound insulation, non-standard measuring setup, frequency of excitation, sound pressure level

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