Scanning laser vibrometry for nanofibrous membrane resonance research

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24220%2F18%3A00006091" target="_blank" >RIV/46747885:24220/18:00006091 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.iiav.org/archives_icsv/2018_icsv25/index.html" target="_blank" >https://www.iiav.org/archives_icsv/2018_icsv25/index.html</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Scanning laser vibrometry for nanofibrous membrane resonance research

Popis výsledku v původním jazyce

Nanofibrous layer performed as a membrane is capable of vibrating at low frequencies due to its small interfibrous spaces and planar arrangement brought into forced vibrations upon impact of sound waves of lower frequencies. Due to the possibility of resonating on its own resonant frequency the nanofibrous membrane is able to absorb critical lower sound frequencies. These unique properties come from the nature of nanofibrous layers - small fibrous diameter, respectively enormous surface area of the layer. This makes it possible to reach higher viscous losses inside the material. Optimal rigidity of the membrane then makes an acoustic system possible to vibrate easier. The resonance of the nanofibrous elements and the membrane inner structure allow acoustic energy to be effectively dissipated. The resonant nanofibrous layers of insignificant thickness and three different surface area densities were prepared from a polymer solution of PA6 with the electrospinning method. For a research purpose of resonance and sound absorption properties of nanofibrous membrane, two methods have been used. The Scanning Laser Vi-brometry has been used for resonant frequencies determination and commonly used Two-microphone Impedance Measurement Tube Type 4206 was employed to measure the sound absorption coefficients. Resonant behavior results from the laser vibrometry were compared with the sound absorption coefficients obtained from the impedance tube. It turned out the resonance curves from the laser vibrometry do not match fully with the sound absorption curves, although a correlation between both methods is obvious. Let's state - the Scanning Laser Vibrometry is an effective approach suitable for nanofibrous membrane resonance assessment, acknowledging there is another major mechanism beyond sound absorption of nanofibrous membranes than resonance of membrane itself, which is considered as a main reason by standard membranes, thus indicating an important role of nanofibrous inner structure in sound absorption.

Název v anglickém jazyce

Scanning laser vibrometry for nanofibrous membrane resonance research

Popis výsledku anglicky

Nanofibrous layer performed as a membrane is capable of vibrating at low frequencies due to its small interfibrous spaces and planar arrangement brought into forced vibrations upon impact of sound waves of lower frequencies. Due to the possibility of resonating on its own resonant frequency the nanofibrous membrane is able to absorb critical lower sound frequencies. These unique properties come from the nature of nanofibrous layers - small fibrous diameter, respectively enormous surface area of the layer. This makes it possible to reach higher viscous losses inside the material. Optimal rigidity of the membrane then makes an acoustic system possible to vibrate easier. The resonance of the nanofibrous elements and the membrane inner structure allow acoustic energy to be effectively dissipated. The resonant nanofibrous layers of insignificant thickness and three different surface area densities were prepared from a polymer solution of PA6 with the electrospinning method. For a research purpose of resonance and sound absorption properties of nanofibrous membrane, two methods have been used. The Scanning Laser Vi-brometry has been used for resonant frequencies determination and commonly used Two-microphone Impedance Measurement Tube Type 4206 was employed to measure the sound absorption coefficients. Resonant behavior results from the laser vibrometry were compared with the sound absorption coefficients obtained from the impedance tube. It turned out the resonance curves from the laser vibrometry do not match fully with the sound absorption curves, although a correlation between both methods is obvious. Let's state - the Scanning Laser Vibrometry is an effective approach suitable for nanofibrous membrane resonance assessment, acknowledging there is another major mechanism beyond sound absorption of nanofibrous membranes than resonance of membrane itself, which is considered as a main reason by standard membranes, thus indicating an important role of nanofibrous inner structure in sound absorption.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10307 - Acoustics

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018; Hiroshima; Japan

ISBN

978-151086845-8

ISSN

2329-3675

e-ISSN

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Počet stran výsledku

8

Strana od-do

3267-3274

Název nakladatele

International Institute of Acoustics and Vibration, IIAV

Místo vydání

Hiroshima, Japan

Místo konání akce

Hiroshima, Japan

Datum konání akce

1. 1. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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