EXPERIMENTAL DETERMINATION OF ACOUSTIC BEHAVIOR OF BUILDING MATERIALS BY MEANS OF ACCELEROMETERIC MEASUREMENTS

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Lukáš Fiala ◽  
Petr Konrád ◽  
Robert Černý
Keyword(s):  
Experimental Determination ◽  
Urban Areas ◽  
Building Materials ◽  
Acoustic Properties ◽  
Traffic Load ◽  
Acoustic Behavior ◽  
Frequency Range ◽  
Acoustic Performance ◽  
Acoustic Load

In Central Europe, brick blocks with incorporated system of voids ensuring good thermal properties are widely used in the building industry. In the present, increasingly higher acoustic load gains on importance especially in the surroundings of places with high traffic load, places close to the airports or in urban areas. This fact should be taken into consideration in the design of constructions in order to ensure their good acoustic performance. The very first step of such design lies in the experimental determination of acoustic properties of the reference construction elements which are, if necessary, subsequently optimized by adjustment of the voids volume and geometry or filling of the voids by various bulk fillers ensuring a higher level of scattering of the propagating acoustic signal. In this paper, steel prism and brick block were subjected to measurements by accelerometers in the frequency range 1 – 10 kHz in order to compare acoustic behavior of materials with a significantly different structure. Finally, frequency-dependent displacements in accelerometers position,

THEORETICAL APPROACH TO DETERMINATION OF ACOUSTIC PROPERTIES OF BUILDING MATERIALS

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Lukáš Fiala ◽  
Robert Černý
Keyword(s):  
Theoretical Approach ◽  
Urban Areas ◽  
Building Materials ◽  
Construction Materials ◽  
Well Being ◽  
Acoustic Properties ◽  
Solid Matrix ◽  
Sound Waves ◽  
Acoustic Load

The presence of high level of acoustic load especially in urban areas is becoming a serious problem in the present. In order to protect people against adverse effects of audio noise on health and personal well-being in buildings located in such areas, convenient construction materials with sophisticated geometric arrangement should be used. Bearing structures of new houses in the Czech Republic are widely made of different types of brick blocks. Such brick blocks consist of solid matrix and cavities designed in an optimized geometrical way in order to assure better thermal and hygric properties. Previous studies dealing both with acoustic properties in an empirical way and with the theoretical aspects of acoustic attenuation in building materials were not very numerous. Nevertheless, they gain constantly in importance with increasing acoustic load of the buildings surroundings. In this paper, a theoretical approach for the determination of acoustic properties, which is convenient for the description of sound waves propagation in building materials, is introduced.

scholarly journals Methods for determination of acoustic properties of building materials

2019 ◽  
Vol 282 ◽  
pp. 02061
Author(s):  
Lukáš Fiala ◽  
Petr Konrád ◽  
Robert Černý
Keyword(s):  
Urban Areas ◽  
Building Materials ◽  
Heavy Traffic ◽  
Harmonic Signal ◽  
Steel Sample ◽  
Acoustic Properties ◽  
Acoustic Insulation ◽  
Reverberation Chambers ◽  
High Level

Experimental determination of acoustic properties of building materials is an important task gaining higher importance due to demand for materials suitable for constructions located in places with high level of noise, typically in urban areas and places close to the areas with heavy traffic. In this paper, two types of experimental setups are arranged, and tested on steel prism and brick block. Transmitter-receiver method is based on exciting the tested material by one period of harmonic signal and analysis of response on two accelerometers placed on the excited and the opposite side of the sample. The second method is based on measurement of the sound pressure level in a system of two reverberation chambers by precise microphones and vibration analyzer. Transmitter-receiver measurement conducted on steel sample revealed the fact that further adjustment of the measurement setup and successive analysis is necessary. Measurement in reverberation chambers is convenient for comparison of acoustic insulation ability of heterogeneous building materials.

scholarly journals Elaboration and Characterization of Composite Materials Based on Plaster-Gypsum and Mineral Additives for Energy Efficiency in Buildings

Proceedings ◽  
2019 ◽  
Vol 34 (1) ◽  
pp. 22
Author(s):  
Bouzit ◽  
Taha
Keyword(s):  
Thermal Conductivity ◽  
Energy Efficiency ◽  
Composite Materials ◽  
Building Material ◽  
Building Materials ◽  
Building Envelope ◽  
Acoustic Properties ◽  
Building Sector ◽  
Acoustic Performance ◽  
Mineral Additives

The building sector is one of the largest energy consumers in the world, prompting scientific researchers to find solutions to the problem. The choice of appropriate building materials presents a considerable challenge for improving the thermal comfort of buildings. In this scenario, plaster-based insulating materials have more and more interests and new applications, such as insulating coatings developing the building envelope. Several works are being done to improve energy efficiency in the building sector through the study of building materials with insulation quality and energy savings. In this work, new composite materials, plaster-gypsum with mineral additives are produced and evaluated experimentally to obtain low-cost materials with improved thermo-physical and acoustic properties. The resulting composites are intended for use in building walls. Plaster-gypsum is presented as a high-performance thermal material, and mineral additives are of great importance because of their nature and are environmentally friendly. Measurements of thermal properties are carried and measurements of acoustic properties. The results show that it is possible to improve the thermal and acoustic performance of building material by using plaster as a base material and by incorporating thermal insulators. The thermal conductivity of plaster alone is greater than that of plaster with mineral additives, offer interesting thermal and acoustic performance. By varying the additives, the thermal conductivity changes. Finally, comparing the results, plaster with mineral additives is considered the best building material in this study

Experimental determination of the electro-acoustic properties of thin film AlScN using surface acoustic wave resonators

2019 ◽  
Vol 126 (7) ◽  
pp. 075106 ◽  
Author(s):  
Nicolas Kurz ◽  
Anli Ding ◽  
Daniel F. Urban ◽  
Yuan Lu ◽  
Lutz Kirste ◽  
...  
Keyword(s):  
Thin Film ◽  
Acoustic Wave ◽  
Experimental Determination ◽  
Surface Acoustic Wave ◽  
Acoustic Properties ◽  
Acoustic Wave Resonators

scholarly journals Определение частотной зависимости комплексной теплопроводности тонких полимерных пленок

2020 ◽  
Vol 90 (6) ◽  
pp. 1047
Author(s):  
А.Н. Алексеев ◽  
Ю.Ф. Забашта ◽  
В.И. Ковальчук ◽  
Д.А. Андрусенко ◽  
Л.А. Булавин
Keyword(s):  
Thermal Conductivity ◽  
Experimental Determination ◽  
Temperature Wave ◽  
Thin Polymer Films ◽  
Frequency Range ◽  
Cellulose Films ◽  
Thin Polymer ◽  
Periodic Temperature ◽  
Frequency Dependences

A method has been developed for the experimental determination of the components of the complex thermal conductivity of thin polymer films. The method is based on measuring the temperature difference on both surfaces of a film in which a periodic temperature wave is excited. Formulas are obtained that relate the observed temperatures to the mentioned components. Using the proposed method at a temperature of 293K in the frequency range (0.01÷0.25) Hz, the frequency dependences of the complex thermal conductivity for cellulose films (thickness 150 um), fluoroplastic (600 um) and polypropylene (600 um) were obtained.

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