Temat: noise analysis - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Study of Noise Propagation for Small Vessels
Autorzy:: Weryk, M.
Kozaczka, E.
Grelowska, G.
Tematy:: ship noise
noise analysis
statistical energy analysis; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/177515.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the results of the noise propagation analysis in ship structures tested in a number of AHTS (Anchor Handling Tug Supply) vessels. Statistical Energy Analysis (SEA) based on numerical model developed specially for the purpose of this numerical investigation were conducted. This numerical model enabled the analysis of both the structural elements and the acoustic spaces. For the detailed studies 47 points fixed at various ship locations were selected. Prediction results with use of the numerical model were compared with the experimental results carried out in six identical AHTS vessels. Experimental studies were performed in accordance with the requirements of the International Maritime Organization (IMO) Resolution A.468 (XII). As a result one presented a comparison of the model analysis and experimental tests results.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Preparation and noise analysis of polymer graphite cathode
Autorzy:: Knápek, A.
Horáček, M.
Chlumská, J.
Kuparowitz, T.
Sobola, D.
Šikula, J.
Tematy:: field emission
polymer graphite
noise analysis; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/220760.pdf Link otwiera się w nowym oknie
Opis:: The paper deals with the preparation and measurement of an experimental polymer graphite cathode that seems to be a promising and cheap source of electrons utilizing cold field-emission in high- and ultra-high vacuum. Polymer graphite seems to be a proper material as it contains a large amount of hybridized carbon with a low degree of surface oxidation and silicon monoxide (SiO). Within the frame of this work, a special experimental method of tip preparation has been designed and tuned. This method is based on ion milling inside a dual-beam electron microscope enabling to obtain ultra-sharp tips of a diameter smaller than 100 nm with a predefined opening angle. The charge transport within experimental samples is evaluated based on results provided by the noise spectroscopy of the total emission current in the time and frequency domains.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Noise Analysis of Differential Multiport Networks : the Wave Approach
Autorzy:: Dobrowolski, J. A.
Tematy:: differential networks
noise analysis
noise waves
noise correlation matrix
differential noise figure; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/226027.pdf Link otwiera się w nowym oknie
Opis:: In this paper there is presented and discussed a general analysis method for noise characterization of noisy multiport differential networks. It is based on mixed mode, differential and common mode, noise waves representation of noise, generalized mixed-mode scattering parameters and generalized mixed-mode noise wave correlation parameters for the network. There are derived analytical relation between the noise figure for a given output port and the noise matrix and the scattering parameters of the network, as well as the correlations between the input port noise waves. The signal to noise ratio degradation factor is derived and discussed, too. Presented results can be implemented directly in a CAD software noise analysis of differential microwave multiport networks with differential as well as with conventional single ended ports.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Towards reliable velocities of permanent GNSS stations
Autorzy:: Bogusz, J.
Klos, A.
Gruszczynska, M.
Gruszczynski, M.
Tematy:: GNSS
time series
noise analysis
velocities
szereg czasowy
analiza hałasu
prędkość; Pokaż więcej
Wydawca:: Politechnika Warszawska. Wydział Geodezji i Kartografii
Powiązania:: https://bibliotekanauki.pl/articles/106797.pdf Link otwiera się w nowym oknie
Opis:: In the modern geodesy the role of the permanent station is growing constantly. The proper treatment of the time series from such station lead to the determination of the reliable velocities. In this paper we focused on some pre-analysis as well as analysis issues, which have to be performed upon the time series of the North, East and Up components and showed the best, in our opinion, methods of determination of periodicities (by means of Singular Spectrum Analysis) and spatio-temporal correlations (Principal Component Analysis), that still exist in the time series despite modelling. Finally, the velocities of the selected European permanent stations with the associated errors determined following power-law assumption in the stochastic part is presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Komputerowe wspomaganie oceny hałasu na stanowiskach pracy
Computer aided assessment of noise level at the work-stands
Autorzy:: Pawlak, H.
Słowik, T.
Tematy:: hałas
stanowisko pracy
analiza hałasu
komputerowe wspomaganie oceny
noise
noise analysis
computer aided evaluation; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Rolniczej
Powiązania:: https://bibliotekanauki.pl/articles/286454.pdf Link otwiera się w nowym oknie
Opis:: Zaprezentowano zasady działania komputerowego programu „ Hałas”, umożliwiającego wykreślanie map topograficznych hałasu w pomieszczeniach pracy, ułatwiających prowadzenie oceny hałasu na stanowiskach pracy. Jednocześnie dzięki programowi można określić bezpieczną dla pracownika odległość od źródła hałasu.
Paper presented the operation principles of HAŁAS (noise) computer programme making possible topographical mapping of the noise inside the working rooms. The programme enables to evaluate the noise level at particular work-stands. Owing to the programme a safe for human distance from the noise source may be also determined.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Octave band analysis of car noise emissions at different speeds and on different pavements
Autorzy:: Staneva, Gergana
Ivanov, Rosen
Kadikyanov, Georgi
Tematy:: noise spectrum analysis
GV
HEV
BEV
analiza widma hałasu; Pokaż więcej
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Powiązania:: https://bibliotekanauki.pl/articles/58909614.pdf Link otwiera się w nowym oknie
Opis:: Noise from cars is one of the main sources of harmful pollution. In the presented paper, an octave frequency band analysis is conducted according to standard methods of external and internal noise measurement. Experiments at different speeds, with three types of cars - conventional gasoline (GV), hybrid (HEV) and pure electric (BEV) - were carried out on two types of pavement - damaged coarse-grained and smooth fine-grained asphalt. The results show variations in external and internal noise levels vs. speed in different octave bands. At each speed, a spectral analysis was done. The diagrams with results show changes in noise level vs. speed and the positions of noise maximums. Regression models for the octave spectrum at different speeds and pavements are developed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Control of the beginning of accidents in railroad operation safety systems in seismically active regions using the noise technology
Autorzy:: Aliev, Telman
Babayev, Tofig
Alizada, Tahir
Rzayeva, Narmin
Tematy:: signal
noise analysis
control
accident
correlation matrix
signaling
railway
seismically active regions
sygnał
analiza hałasu
kontrola
wypadek
macierz korelacyjna
sygnalizacja
kolej
rejony aktywne sejsmicznie; Pokaż więcej
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Powiązania:: https://bibliotekanauki.pl/articles/374501.pdf Link otwiera się w nowym oknie
Opis:: On the railroads in seismically active regions, the impact of frequent weak earthquakes accelerates the initiation of defects such as wear and tear, cracks and deformation due to fatigue. An analysis of the types and stages of initiation and development of defects preceding accidents at technical facilities has shown that the registration of the beginning of the latent period of transition of objects to an emergency state based on the results of traditional technologies of analysis of measurement information in the applied control systems in the field of railway transport is delayed owing to the difficulties of noise analysis. The proposed algorithms and noise analysis technologies allow forming corresponding sets of informative attributes to control the beginning of the latent period of accidents. Their use in intelligent noise control systems will improve the safety of this mode of transportation. To this end, it is expedient to create a subsystem for noise seismic hazard warning, i.e., a subsystem for noise control of the onset of the initiation and dynamics of development of changes in the technical condition of the rolling stock, railroad tracks, bridges, tunnels, and other railroad infrastructure facilities.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Discriminant Analysis and Optimization Applied to Vibration Signals for the Quality Control of Rotary Compressors in the Production Line
Autorzy:: Reis, Déborah
Vanzo, Fernanda
Reis, Jorge
Duarte, Marcus
Tematy:: discriminant analysis
noise
optimization
quality control; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/176740.pdf Link otwiera się w nowym oknie
Opis:: In this paper, the applications of the multivariate data analysis and optimization on vibration signals from compressors have been tested on the assembly line to identify nonconforming products. The multivariate analysis has wide applicability in the optimization of weather forecasting, agricultural experiments, or, as in this case study, in quality control. The techniques of discriminant analysis and linear program were used to solve the problem. The acceleration and velocity signals used in this work were measured in twenty-five rotating compressors, of which eleven were classified as good baseline compressors and fourteen with manufacturing defects by the specialists in the final acoustic test of the production line. The results obtained with the discriminant analysis separated the conforming and nonconforming groups with a significance level of 0.01, which validated the proposed methodology.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: An Overview of the Noise Levels Measured in Industrial Facilities in Serbia and Implemented Methods of Protection
Autorzy:: Luburić, Uranija Kozmidis
Samardžić, Selena
Lakatoš, Robert
Mihailović, Aleksandra
Veselinović, Milka
Tematy:: noise
industry
SPL
sound pressure level
frequency analysis
noise protection; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/176762.pdf Link otwiera się w nowym oknie
Opis:: Noise is one of the most significant factors which not only disturbs working conditions, but has a large impact on workers’ health. This problem has existed in industries since the beginning and, despite technical and other solutions, it has not been solved. There is a large number of papers, supported with very detailed analyses, that investigate noise levels in industry or contain questionnaires about the impact of noise on workers’ overall health and work abilities. The purpose of this paper is to contribute to the global picture of sustainability and the development of strategies for improving the quality of working environment, with special attention to the generation of noise in different production processes in thirteen different industries in Novi Sad, Serbia. The paper also seeks to examine the advantages and drawbacks of the implemented protective methods and to provide some recommendations for their better implementation in order to contribute to solving this significant problem of today.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Assessment of annoyance imact of road noise sources under the laboratory conditions
Ocena dokuczliwości oddziaływania źródeł hałasu drogowego w warunkach laboratoryjnych
Autorzy:: Paszkowski, W.
Tematy:: variance analysis
noise annoyance
road noise
analiza wariancji
dokuczliwość hałasu
hałas drogowy; Pokaż więcej
Wydawca:: STE GROUP
Powiązania:: https://bibliotekanauki.pl/articles/112562.pdf Link otwiera się w nowym oknie
Opis:: The article presents an attempt to statistical assessment of the results of psychoacoustic studies of the experiment carried out on the annoyance of road noise sources. The study was subjected to noise annoyance assessment of emitted acoustic signals under laboratory conditions. The obtained results may be used in the acoustic quality modeling the acoustic quality of the urban environment at risk of noise.
W artykule przedstawiono próbę oceny statystycznej wyników badań psychoakustycznych z przeprowadzonego eksperymentu nad dokuczliwością źródeł hałasu drogowego. Badaniu podlegała ocena dokuczliwości hałasowej emitowanych sygnałów akustycznych w warunkach laboratoryjnych. Otrzymane wyniki badań wykorzystane mogą być w zadaniach modelowania jakości akustycznej środowiska zurbanizowanego zagrożonego hałasem.
Dostawca treści:: Biblioteka Nauki

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