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1
Content available Comparative analysis of the acoustic properties of granular materials determined with the use of impedance tube
Kosała Krzysztof
Vibrations in Physical Systems
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2022
|
Vol. 33, nr 3
art. no. 2022321
EN
The results of acoustic property tests for six types of granular materials: perlite, vermiculite, active coconut carbon, rubber granulates, pumice and wood chips, which can be used in noise protection structures, are shown in the article. The characteristics of the normal incidence sound absorption coefficient and the normal incidence sound transmission loss for material specimens with seven thicknesses in the range of 10-100 mm were determined based on the results of experimental tests carried out with the use of an impedance tube. The relationships between the first resonant absorption frequencies and the thicknesses of material specimens were determined. Single-number indices for the tested materials, in the form of the weighted sound absorption coefficients, were determined. Subsequently, dependencies of these indices on the surface mass of the tested materials were determined. The research showed that three materials, perlite, vermiculite and active coconut carbon, were distinguished among the examined granules with the best sound-absorbing and sound-insulating properties. Active coconut carbon had the best sound-insulating properties among the granular materials tested.
2
Content available Analysis of factors influencing the measurement result of the reverberant sound absorption coefficient under laboratory conditions
Czapla Marcjanna, Wszołek Tadeusz
Vibrations in Physical Systems
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2022
|
Vol. 33, nr 1
art. no. 2022103
EN
There are still discrepancies in the measurement results despite the standardized methods of measuring the sound absorption coefficient in the reverberation room. They appear especially in interlaboratory tests. The research used the method included in the EN-ISO 354: 2003 standard to determine the sound absorption coefficient. The subject of scientific research was to investigate the impact of measurement techniques (Maximum Length Sequence method and interrupted noise method for both T20 and T30 evaluation ranges), humidity in the test room, sample seasoning and sample fitting, and finally the influence of room variability on the measurement results. The tests were performed in two reverberation chambers. The study included two types of materials. Samples (1) made of identical pieces of mineral wool (ISOVER glass wool and ROCKWOOL rock wool) and (2) of fibreboard. Mineral wool was of different thicknesses. Among the measurement techniques, the smallest dispersion of the reverberation time results was obtained with the MLS -T30 method, and the highest differences in the results were caused by the test being performed in another room (reverberation chamber). There was no significant influence with the increase in humidity or the careful arrangement of the test sample from the components on the measurement result.
3
Content available Application of the impulse response method in the test of acoustic properties of building materials
Piechowicz Janusz
Vibrations in Physical Systems
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2021
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Vol. 32, nr 2
art. no. 2021201
EN
Understanding the acoustic properties of the materials used in the construction of wall surfaces, plays an important role in structural and environmental acoustics. There are many research methods for determining the acoustic parameters of building elements, such as the sound absorption coefficient, the sound reflection coefficient, or the sound insulation index determined in the laboratory or in situ. This work focuses on the determination of the sound absorption coefficient and the possibility of its measurement in "in situ" conditions by the impulse response method. The main purpose of the presented research was to check whether it is possible to use the impulse method in a small reverberant room to determine the sound absorption coefficient of a small part of the wall structure.
4
Content available remote Projektowanie adaptacji akustycznej otwartych pomieszczeń do prac administracyjnych. Część 1. Projektowanie podstawowe
Mikulski Witold
Materiały Budowlane
|
2019
|
nr 8
16--20
PL
Projektowanie akustyczne pomieszczeń biurowych open space polega na takim uwzględnieniu w pomieszczeniu różnych wyrobów dźwiękochłonnych, aby uzyskać wymagane przepisami warunki akustyczne. W artykule projektowanie podzielono na dwa etapy. Etap pierwszy, wymagany przez przepisy polskie, to uzyskanie w pomieszczeniu wymaganej chłonności akustycznej. Natomiast etap drugi polega na takiej aranżacji akustycznej pomieszczenia i stanowisk pracy, aby uzyskać w nim wymagane warunki propagacji (a właściwie separacji) dźwięków mowy między stanowiskami pracy. Zewzględu na objętość, artykuł podzielono na dwie części. W części pierwszej opisano pierwszy etap projektowania (podano metodę obliczeniową wg PN-B-02151-4:2015 i przykład). W części drugiej, w następnym artykule, opisany zostanie etap drugi projektowania wraz z podaniem przykładu (z wykorzystaniem programu ODEON).
EN
The acoustic design of the open plan office consists in taking into account various sound-absorbing products in the room to achieve the required acoustic conditions. In the article design is divided into two stages. The first stage, obligatory by Polish regulations, is to obtain the room's required sound absorption. The second stage consists in such an acoustic arrangement of the room and workstations to obtain the required conditions for the propagation (or actually separation) of speech sounds between workstations. Due to the volume, the article has been divided into two parts. The first part (this one) describes the first design stage (the calculation method according to PN-B-02151-4:2015 standard and example are given). In the second part, in the next article, the second design stage (using the ODEON software) will be described.
5
Content available Zastosowanie metod MLS i Swept Sine do pomiarów akustycznych w warunkach wysokiego tła akustycznego
Tomczyk P.
Prace Instytutu Techniki Budowlanej
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2010
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R. 39, nr 4
27-52
PL
Przedstawiono ogólne informacje na temat metod pomiarowych z wykorzystaniem odpowiedzi impulsowej, opisano wymagania nowych metod pomiarowych oraz podano wyniki pomiarów przeprowadzonych z zastosowaniem nowych technik (MLS, Swept Sine), a także dokonano porównania wyników otrzymanych przy użyciu nowych technik z wynikami otrzymywanymi metodami klasycznymi.
EN
This paper includes general information on measurement methods with the use of impulse response. Requirements concerning new measurement techniques have been described and results of measurements conducted using new methods (MLS, Swept Sine) have been presented. Results achieved by the use of new techniques and those achieved by classical methods have been compared.
6
Content available remote Perforowane ustroje dźwiękochłonne
Mirowska M.
Materiały Budowlane
|
2006
|
nr 8
38-40
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