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Wyświetlanie 1-11 z 11
Tytuł:
Application of the Bayesian Inference for Estimation of the Long-Term Noise Indicators and Their Uncertainty
Autorzy:
Batko, W.
Stępień, B.
Powiązania:
https://bibliotekanauki.pl/articles/1504185.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.50.Rq
43.50.Yw
Opis:
The problem of estimation of the environmental noise hazard indicators and their uncertainty is presented in the hereby paper. The main attention is focused on the estimation process of the long-term noise indicators and their type A standard uncertainty defined by the standard deviation of the mean of the measurement results. The rules given in the ISO/IEC Guide 98 are used in the calculations. It is usually determined by means of the classic variance estimators, at the assumption of the normality of measurements results. However, such assumption in relation to the acoustic measurements is rather questionable. This is the reason that the authors indicated the necessity of implementation of non-classic statistic solutions. There was formulated the estimation idea of seeking density function of long-term noise indicators distribution by the Bayesian inference, which does not generate limitations for form and properties of analyzed statistics. There was presented theoretical basis of the proposed method, and the example of calculation process which make possible determining searched estimators of expected value and variance of long-term noise indicators $L_{DEN}$ and $L_{N}$. The illustration for indicated solutions and usefulness analysis was constant monitoring results of traffic noise recorded on one of the main arteries of Kraków, Poland.
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 916-920
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Bootstrap Estimator for Uncertainty Analysis of the Long-Term Noise Indicators
Autorzy:
Batko, W.
Stępień, B.
Powiązania:
https://bibliotekanauki.pl/articles/1537345.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.50.Rq
43.50.Yw
Opis:
In the process of environmental noise hazards assessment besides estimation of uncertainty measurement of control results there should be made errors analysis related to estimation processes to long-term noise indicators. the condition of correct quantification of uncertainty budget components in the control process is using proper analysis method. The problem rest on determining density function of probability distribution of long-term noise indicators. in order to several conditioning characteristic for the problem it can not be to solved by classic estimation analysis applied in statistical researches, without different reservations. There was formulated the estimation idea of seeking density function of long-term noise indicators distribution by bootstrap method, which does not generate limitations for form and properties of analyzed statistics. There was presented theoretical basis of the proposed method, and the example of calculation process which make possible determining searching estimators of expected value and variance of long-term noise indicators $L_{DEN}$ and $L_{N}$. The illustration for indicated solutions and usefulness analysis was continuous monitoring results of a traffic noise recorded on one of the main arteries of Kraków.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 11-16
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sound Pressure Level Analysis of Commercials and Regular Programs
Autorzy:
Malecki, P.
Wiciak, J.
Powiązania:
https://bibliotekanauki.pl/articles/1537508.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.50.Sr
43.50.Rq
43.50.Yw
Opis:
Popularity of television and multitude of commercials during the TV broadcast lead to the analysis of its sound levels. Costs of commercials' time cause producers to make commercials much louder than a regular TV program. The article shows results of commercials and regular program sound level (RMS and FFT) analysis and the difference in sound levels of commercials compared to a regular program. The analysis also shows the difference between public and private TV. The authors of the article suggest a solution to this problem and its effects.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 118-122
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust Statistical Procedures in Statistical Analysis of Controllable Noise Indicators
Autorzy:
Batko, W.
Knapik, O.
Powiązania:
https://bibliotekanauki.pl/articles/1400074.pdf
Data publikacji:
2013-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.60.Cg
43.50.Rq
43.50.Yw
Opis:
The subject of the paper is statistical analysis of noise measurement results in control research of environment which is crucial for the process of identification, estimation, and interpretation of the characteristics of representative noise indicators. The proposed approach is based on robust methods of statistical analysis. In particular, the method of modeling measurement results with the use of autoregressive-moving average (ARMA) time series models is described. The subjects of identification, analysis, and connected matter of verification that occur during proposed mathematical formalization of considered problem are stated. Furthermore, the question of the validity and usability of normal distribution approximation, which is very common in modeling and estimation of the expected value of the equivalent sound level, is addressed. The illustration of the proposed methodology is represented by an example of the noise analysis from the permanent monitoring in the city of Kielce. The obtained results create the background for uncertainty of estimates of calculation concerning controlled noise indicators that describe the state of acoustic environmental threats.
Źródło:
Acta Physica Polonica A; 2013, 123, 6; 1007-1011
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shipping Low Frequency Noise and Its Propagation in Shallow Water
Autorzy:
Kozaczka, E.
Grelowska, G.
Powiązania:
https://bibliotekanauki.pl/articles/1504390.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.30.Nb
43.50.Yw
43.50.Rq
Opis:
One of the most significant factor influencing acoustical climate of the sea is underwater noise generated by moving ships. If the considered sea area has features of the shallow water, namely the wave frequency fulfils relation f < 10c/h, where c denotes phase speed of sound, and h is depths of the sea, then in certain distance from the wave source specific image of sound pressure distribution in the mean of wave modes appears. The modes constitute wave packet propagating with group speed in the direction parallel to the sea surface. The paper presents results of the experimental investigation concerning the distribution of the sound field created by moving ship in the shallow water, in a small distance from the ship. The main acoustical characteristics, describing features of the field are spectrograms in pseudo-3D system: distance and frequency in geometrical form, and sound intensity in the optical one (color). Results presented in such a way pointed individual features of the sound source known often as acoustical signature of the source (ship).
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 1009-1012
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of Aircraft Noise During Acoustic Monitoring by Using 3D Sound Probes
Autorzy:
Kłaczyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1196857.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.50.Yw
43.58.+z
43.60.Jn
Opis:
Undertaking long-term acoustic measurements on sites located near an airport is related to a problem of large quantities of recorded data which very often represents information not related to flight operations. In such areas, usually defined as zones of limited use, other sources of noise often exist such as roads or railway lines treated in such context as an acoustic background. Manual verification of such recorded data is a costly and time-consuming process. Automatic differentiation of the tested noise source from background and precise recognition of quantitative impact of aircraft noise on the acoustic climate in a particular area is an important task. This paper presents the idea of a method that can be used for identifying aircraft operations (flights, take-offs, landings) supported by experimental studies carried out with the use of 3D Microflown sound intensity probe and SoundField ST350 ambisonic microphone. The proposed method is based on determining the spatial sound intensity vector in the tested acoustic field during a monitoring timespan. On the grounds of this information, aircraft operations are marked in a continuous record of noise events.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-144-A-148
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Realization of a Phase Noise Measurement Bench Using Cross Correlation and Double Optical Delay Line
Autorzy:
Salzenstein, P.
Cussey, J.
Jouvenceau, X.
Tavernier, H.
Larger, L.
Rubiola, E.
Sauvage, G.
Powiązania:
https://bibliotekanauki.pl/articles/2047892.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
06.30.Ft
43.50.Yw
87.64.M-
87.57.cm
Opis:
In this paper there are presented first results obtained with a phase noise measurement bench operating in X-band, realized in our laboratory, using double optical delay line and cross correlation. Phase noise floor using a microwave sapphire oscillator is better than -160 dB rad$\text{}^{2}$/Hz at 10 kHz from the 10 GHz carrier, using a 2 km optical delay line.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1107-1111
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Mini-Disk Resonator Integrated into a Compact Optoelectronic Oscillator
Autorzy:
Salzenstein, P.
Tavernier, H.
Volyanskiy, K.
Kim, N.
Larger, L.
Rubiola, E.
Powiązania:
https://bibliotekanauki.pl/articles/1795637.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
06.30.Ft
43.50.Yw
87.64.M-
87.57.cm
Opis:
This work consists in the design, fabrication and characterization of mini-disk $MgF_{2}$ resonators for integration into optoelectronic oscillator and first experimental results of implementation in microwave free spectral range oscillator with taper coupling optoelectronic oscillator.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 661-663
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sound Wave Diffraction at the Edge of a Sound Barrier
Autorzy:
Piechowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1504424.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.20.El
43.20.Fn
43.50.Gf
43.50.Yw
43.60.Ek
43.55.Rg
Opis:
The diffraction phenomenon is described by the Huygens-Fresnel principle. The review of physical laws ruling the bending of sound waves at the edge of the screen allows the effective selection of both acoustical and geometrical parameters of the screen. Sound wave diffraction theories have been developed on the basis of wave optics, when wavelength is small in comparison to the size of the obstacles, which can be also used in acoustics with the same assumptions about geometry of the system. Diffraction can be seen as a result of the interference of waves reaching the point of observation in accordance with the laws of geometrical optics and wave disturbances arising as a result of interaction with the edge of an obstacle. The paper describes a test method using maximum length sequences for determining the intrinsic characteristics of sound diffraction in situ during testing of roadside noise barriers. A scale model experiment has been performed in an anechoic room. Also, a real noise reducing device was tested in free field conditions.
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 1040-1045
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sound Diffraction Over Noise Barriers with Added Devices Installed on the Top Edge
Autorzy:
Piechowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1402178.pdf
Data publikacji:
2015-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.20.El
43.20.Fn
43.50.Gf
43.50.Yw
43.60.Ek
43.55.Rg
Opis:
Airborne sound insulation index of the noise barrier panel and the sound absorption coefficient of the barrier surface are the acoustic parameters that are usually determined in specialized laboratories, however they can be also determined in situ. Acoustic characteristics of a barrier include also the diffraction index difference determined from comparison of barriers with plain top edges and barriers with added devices installed on the top edge. The index is determined from the impulse response values determined for the acoustic wave propagation path from the sound source to a set of properly distributed measurement points. By means of the same method, one can also determine the difference in a barrier's acoustic effectiveness between the plain top barrier structure and its version with added devices mounted on the top. The paper presents measurement results for three types of added devices mounted on the top edge of the barrier. The diffraction index differences have been determined for each added device type and the acoustic effectiveness for each device has been compared with the plain top edge acoustic barrier.
Źródło:
Acta Physica Polonica A; 2015, 128, 1A; A-36-A-40
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on Infrasound Noise Generated by Operation οf Low-Power Wind Turbine
Autorzy:
Pierzga, R.
Boczar, T.
Wotzka, D.
Zmarzły, D.
Powiązania:
https://bibliotekanauki.pl/articles/1399396.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.28.Dm
43.50.Ed
43.50.Cb
43.50.Rq
43.50.Yw
88.50.jj
88.50.gp
Opis:
Subject matter of this paper deals with issues of the environmental impact of infrasound noise associated with operation of low-power wind turbines. It is now the current and relevant problem for both the cognitive and utilitarian standpoint. There is now a considerable growth in the number of such installations in Poland, Europe and in the world, due to the possibility of locating them on existing building roofs in heavily urbanized areas, and without having to build additional supporting structures. As part of the study, measurements of low frequency acoustic signals generated during operation of micro turbine equipped with a rotor of vertical axis of rotation relative to the wind direction have been performed. Analyses were carried out in order to determine the impact of wind speed and selected meteorological parameters on the level of infrasound signals emitted by the test turbine. In addition, frequency analysis of the recorded signals was performed. Then, the obtained results were subjected to comparative analysis. In summary, the achieved results were referred to the limits of sound pressure intensity level of infrasound signals as specified for the working environment in accordance with the Polish Standard PN-Z-01338.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 542-545
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-11 z 11

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