Temat: noise barrier - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Performance of Environmental T-shape Noise Barriers Covered with Primitive Root Diffusers
Autorzy:: Monazzam, M. R.
Naderzadeh, M.
Nassiri, P.
Fard, S. M. B.
Powiązania:: https://bibliotekanauki.pl/articles/177980.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: noise barrier
resistive layers
T-shape barrier
primitive root diffuser
Opis:: There is a considerable increase in the use of noise barriers in recent years. Noise barriers as a control noise solution can increase the insertion loss to protect receivers. This paper presents the results of an investigation about the acoustic efficiency of primitive root sequence diffuser (PRD) on an environmental single T-shape barrier design. A 2D boundary element method (BEM) is used to predict the insertion loss of the tested barriers. The results of rigid and with a different sequence diffuser coverage are also predicted for comparison. Employing PRD on the top surface of T-shape barrier has been found to improve the performance of barriers in comparison with the use of rigid and QRD coverage at the examined receiver locations. It has been found that decreasing the design frequency of PRD shifts the frequency effects towards lower frequencies, and therefore the overall A-weighted insertion loss is improved. It was also found that using wire mesh with reasonably efficient resistivity on the top surface of PRD improves the efficiency of the reactive barriers; however utilizing wire meshes with flow resistivity higher than the specific acoustic impedance of air on the PRD top of a diffuser barrier significantly reduces the performance of the barrier within the frequency bandwidth of the diffuser. The performance of a PRD covered T-shape barrier at 200 Hz was found to be higher than that of its equivalent QRD barriers in both the far field and in areas close to the ground. The amount of improvement compared made by PRD barrier compared with its equivalent rigid barrier at far field is about 2 to 3 dB, while this improvement relative to the barrier model "QR4”"can reach up to 4–6 dB.
Źródło:: Archives of Acoustics; 2010, 35, 4; 565-578
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Performance Evaluation of T-Shaped Noise Barriers Covered with Oblique Diffusers Using Boundary Element Method
Autorzy:: Monazzam, Mohammad Reza
Abbasi, Milad
Yazdanirad, Saeid
Powiązania:: https://bibliotekanauki.pl/articles/177090.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: noise barrier
oblique diffuser
T-shaped
boundary element method
Opis:: One of the most effective designs to control the road traffic noise is the T-shaped barrier. The aim of this study was to examine the performance of T-shape noise barriers covered with oblique diffusers Rusing boundary element method. A 2D simulation technique based on the boundary element method (BEM) was used to compute the insertion loss at the center frequency of each one-third octave band. In designer barriers, the top surface of the T-shaped noise barriers was covered with oblique diffusers. The width and height of the barrier stem and the width of its cap were 0.3, 2.7, and 1 m, respectively. Angles of the oblique diffusers were 15, 30, and 45 degrees. The oblique diffusers were placed on the top surface with two designs including same oblique diffusers (SOD) and quadratic residue oblique diffusers (QROD). Barriers considered were made of concrete, an acoustically rigid material. The barrier with characteristics of QROD, forward direction, and sequence of angles (15, 30, and 45 degrees) had the greatest value of the overall A-weighted insertion loss equal to 18.3 to 21.8 dBA at a distance of 20 m with various heights of 0 to 6 m.
Źródło:: Archives of Acoustics; 2019, 44, 3; 521-531
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Photovoltaic System Integrated Into the Noise Barrier – Energy Performance and Life Cycle Assessment
Autorzy:: Zdyb, Agata
Żelazna, Agnieszka
Krawczak, Ewelina
Powiązania:: https://bibliotekanauki.pl/articles/124233.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: photovoltaics
noise barrier
Life Cycle Assessment
Global Warming Potential
IMPACT2002+
Opis:: The presented work is devoted to the analysis of the performance of an installation comprising photovoltaic modules (3.56 kWp) integrated into a noise barrier under temperate climate. The application of the DDS-Cad software enables to estimate the amount of electricity produced annually. The use of LCA (Life Cycle Assessment) method, based on the material and energy balance of the system, allows the ecological evaluation of the analyzed solution. The designed installation, in which the thin film cadmium telluride modules were applied, can produce 3390 kWh of electric energy per year. This kind of photovoltaic system can be multiplied depending on the available number of acoustic panels oriented at the desired azimuth along the highway or railway.
Źródło:: Journal of Ecological Engineering; 2019, 20, 10; 183-188
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: In situ studies of sound insulation index of noise barriers
Badania izolacyjności akustycznej ekranów w warunkach terenowych
Autorzy:: Piechowicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/369047.pdf
Data publikacji:: 2010
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: izolacyjność akustyczna
ekrany akustyczne
metody badań
pomiary akustyczne in situ
airborne sound insulation
noise barrier
test methods
in situ measurement
Opis:: Outdoor noise barrier is roadside noise reducing device, the primary task of which is the protection of a pre-determined sound protection area against road traffic noise. The examinations of acoustic properties of the ele-ments used for construction of noise barriers are usually carried out in laboratory conditions according to the PN-EN 1793-1,2 standard. These examination procedures cannot be applied to existing installations. Therefore problems that are usually neglected are the problems related to the acoustic properties that essentially depend on a series of factors unrelated to the building elements themselves, namely: barrier dimensions, quality of workman-ship, barrier location and the type and topography of the ground foundation. In the European Research Project "Adrienne" a methodology has been elaborated for in-situ determination of acoustic parameters of noise barriers. The examination, in which analysis of the system's impulse response after MLS signal actuation and a proper numerical algorithm are applied, leads to determination of airborne sound insulation of the existing constructions as well as the single number sound reflection factors and differences of diffraction properties at the top-edge elements of the barriers. The present paper describes the possibilities of determination of the intrinsic characteristics of airborne sound insulation index for the road traffic noise reducing devices in free field conditions and the determination of single number rating of airborne sound insulation to indicate the performance of the noise barrier.
Ekran akustyczny jest drogowym urządzeniem przeciwhałasowym, którego zasadniczym zadaniem jest ochrona przed hałasem komunikacyjnym terenów chronionych akustycznie. W warunkach laboratoryjnych badania właściwości akustycznych elementów do budowy ekranów akustycznych prowadzone są według wymagań norm PN-EN 1793-1,2. Tych procedur badawczych nie można zastosować do instalacji już wybudowanych. Zatem pomijany jest problem dotyczący właściwości akustycznych, które zależą od wielu czynników, niezwiązanych tylko z wyrobem budowlanym, takich jak: wymiary ekranu, jakość wykonania, usytuowanie i związane z tym rodzaj oraz geometria podłoża. W ramach europejskiego projektu "Adrienne" opracowano metodykę wyznaczania parametrów akustycznych ekranów w warunkach in situ. Pomiary, w których wykorzystuje się analizę odpowiedzi impulsowej układu przy pobudzeniu sygnałem MLS i odpowiedni algorytm obliczeniowy, prowadzą do wyznaczenia izolacyjności akustycznej rzeczywistych konstrukcji oraz jednoliczbowych wskaźników odbicia dźwięku i różnicy dyfrakcji dla krawędziowych elementów ekranów. W pracy przedstawione są możliwości wyznaczania charakterystyk rzeczywistych izolacyjności akustycznej od dźwięków powietrznych dla drogowych urządzeń przeciwhałasowych w warunkach terenowych i wyznaczenia jednoliczbowego wskaźnika oceny izolacyjności akustycznej.
Źródło:: Mechanics and Control; 2010, 29, 4; 179-183
2083-6759
2300-7079
Pojawia się w:: Mechanics and Control
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Side Effect of the Use of Acoustic Barriers Observed in the Infra Range
Autorzy:: Staniek, Andrzej
Bartmański, Cezary
Powiązania:: https://bibliotekanauki.pl/articles/176858.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: modal analysis
infra range noise
vibration
acoustic barrier
road traffic
Opis:: Acoustic barriers which are positioned along traffic lanes are designed to protect the surroundings from excessive noise. Such structures are to reverberate, diffract and damp the propagating acoustic waves. However, this method of shielding has some disadvantages which include constraint visibility and structure-born noise. The interaction between traffic-caused movement of air mass and acoustic barriers may generate infra noise waves. That is undesirable and should be estimated. The authors undertook the research to diagnose the plausible side effect of structure-born noise of such barriers because it may influence human body (Kasprzak, 2014). As a mechanical structure, the acoustic barrier is characterized by mechanical parameters which, in the field of modal analysis, are made up of natural frequencies, damping factors and mode shapes. In this paper the authors investigated the acoustic pressure distribution in the neighborhood of a real acoustic barrier in the scope of infra noise propagation. The methods of modal analysis were used to identify natural frequencies of the barrier and dominating frequencies of propagating waves in the far field. The correlation between observed vibration and acoustic signals is presented.
Źródło:: Archives of Acoustics; 2020, 45, 1; 103-110
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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