Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "acoustic model" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 26
Tytuł:
Uniform stability in structural acoustic systems with thermal effects and nonlinear boundary damping
Autorzy:
Lasiecka, I.
Lebiedzik, C.
Powiązania:
https://bibliotekanauki.pl/articles/206079.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
nonlinear boundary damping
structural acoustic model
thermoelastic plates
uniform stabilization
Opis:
The stabilization problem for a structural acoustic model is considered. The model under consideration is that of acoustic cavity (wave equation) coupled at the interface with a flexible wall (plate equation) which accounts for thermal effects. It is shown that frictional, nonlinear damping applied at the boundary of the acoustic chamber provides the uniform decay rates for the energy function of the overall structure. The main novelty of this result, with respect to the literature, is that the uniform stability for the model is established without assuming any mechanical damping the wall.
Źródło:
Control and Cybernetics; 1999, 28, 3; 557-581
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic models of bus interior regarding the different points of working combustion engine
Modele akustyczne wnętrza autobusów w różnych punktach pracy silników spalinowych
Autorzy:
Komorski, P.
Szymański, G. M.
Powiązania:
https://bibliotekanauki.pl/articles/134122.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
combustion engine
acoustic model
noise
bus
silnik spalinowy
model akustyczny
hałas
autobus
Opis:
The article presents an analysis of sound propagation inside the selected road transport vehicles in the city of Poznan. The research was based on the measurements of the levels of acoustic pressure generated by several bus combustion engines during an acceleration process – at various rotation speed of the crankshaft in combustion engines. Then taking into consideration the measurements and the assumptions of acoustic holography in domain of time, several acoustic models of sound propagation inside the buses at various points on the working combustion engines were elaborated.
W artykule przedstawiono analizę propagacji dźwięku wewnątrz wybranych pojazdów drogowych komunikacji miejskiej miasta Poznań. Przeprowadzono badania polegające na pomiarach ciśnienia akustycznego generowanego przez autobusowe silniki spalinowe w trakcie przyspieszania – przy różnych prędkościach obrotowych wału korbowego silników spalinowych. Następnie na podstawie wyników pomiarów oraz założeń holografii akustycznej w dziedzinie czasu, opracowano modele akustyczne rozkładu poziomu dźwięku wewnątrz autobusów w różnych punktach pracy silników spalinowych.
Źródło:
Combustion Engines; 2015, 54, 3; 619-625
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation for Acoustic Radiation Force from Rectangular Weakly Focusing Transducer Using the Ray Acoustic Model
Autorzy:
Yu, Lili
Qiao, Shuchang
Shou, Wende
Li, Junhua
Powiązania:
https://bibliotekanauki.pl/articles/2141691.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
radiation force calculation
ray acoustic model
rectangular weakly focusing transducer
far-field integration
Opis:
Based on the ray acoustic model, a new relationship between the radiation force and the acoustic power is studied for a rectangular weakly focusing transducer. The effect of pressure reflection coefficient on this model is discussed. For a totally absorbing target, an approximate closed-form expression is also derived and the performance of this model is compared with that of the far-field integration model. The numerical results show that the agreement is excellent with these two models, which can be both used for correction of measured results, but the formula based on the ray acoustic model can be applied more widely in practice because of its simpler expression. The experimental results show further the effectiveness of the relationship between radiation force and acoustic power for rectangular weakly focusing transducer based on the ray acoustic model. The results presented in this paper are important for application of ultrasound transducers in therapy.
Źródło:
Archives of Acoustics; 2022, 47, 1; 81-88
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization problems for structural acoustic models with thermoelasticity and smart materials
Autorzy:
Lasiecka, Irena
Powiązania:
https://bibliotekanauki.pl/articles/729240.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
structural acoustic model with thermal effects
optimal control problem
smart controls
nonstandard Riccati equations
analyticity of semigroups
Opis:
Optimization problem for a structural acoustic model with controls governed by unbounded operators on the state space is considered. This type of controls arises naturally in the context of "smart material technology". The main result of the paper provides an optimal synthesis and solvability of associated nonstandard Riccati equations. It is shown that in spite of the unboundedness of control operators, the resulting gain operators (feedbacks) are bounded on the state space. This allows to provide full solvability of the associated Riccati equations. The proof of the main result is based on exploiting propagation of analyticity from the structural component of the model into an acoustic medium.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2000, 20, 1; 113-140
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of Sound Power Levels and Surface Absorption Coefficients in Multi-Source Industrial Buildings by Using a Simplified Diffusion Model
Autorzy:
Sequeira, M. E.
Cortínez, V. H.
Powiązania:
https://bibliotekanauki.pl/articles/177679.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
industrial noise
noise source identification
sound absorption coefficient
two-dimensional acoustic diffusion model
simulated annealing algorithm
Opis:
This article deals with the identification of sound powers and absorption surface coefficients in multisource industrial buildings from the knowledge of the sound pressure levels (SPLs) at several monitoring points. This inverse problem is formulated as one of optimisation in which the objective function is the difference between the measured and predicted SPLs. The methodology combines the use of a simplified acoustic diffusion model with the simulated annealing optimisation technique. The former is a recently developed model for estimating the SPLs in a fast and sufficiently accurate form. The low computational cost of the model constitutes the major advantage for the optimisation procedure due to the great numer of simulations required. Numerical examples are given to show the efficiency of the proposed approach.
Źródło:
Archives of Acoustics; 2018, 43, 1; 93-102
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza własności akustycznych pomieszczenia w zależności od kształtu sufitu
Analysis of acoustic properties of room depending on the shape of ceiling
Autorzy:
Jabłoński, M.
Powiązania:
https://bibliotekanauki.pl/articles/362605.pdf
Data publikacji:
2010
Wydawca:
Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:
parametry akustyczne
ocena akustyczna pomieszczeń
komputerowy model pola akustycznego
acoustic parameters
estimate of acoustic accommodation
computer model of acoustic field
Opis:
W pracy przedstawiono porównanie własności akustycznych pomieszczenia dla różnego rodzaju konstrukcji sufitu. Wykorzystano parametry związane ze stosunkiem energii (C80), przestrzenne (LF), określające zrozumiałość mowy (STI) oraz spadek energii w przestrzeni (DL2)
This paper presents a comparison of acoustic properties of room for different types of ceiling construction. We used parameters related to energy ratio (C80), spatial (LF), indicating the speech intelligibility (STI) and a spatial decay (DL2).
Źródło:
Fizyka Budowli w Teorii i Praktyce; 2010, T. 5, nr 3, 3; 13-16
1734-4891
Pojawia się w:
Fizyka Budowli w Teorii i Praktyce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Creating Acoustic Maps Employing Supercomputing Cluster
Autorzy:
Czyżewski, A.
Kotus, J.
Szczodrak, M.
Powiązania:
https://bibliotekanauki.pl/articles/177400.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise pollution
acoustic noise monitoring
noise propagation model
supercomputing
acoustic maps
Opis:
The implemented online urban noise pollution monitoring system is presented with regard to its conceptual assumptions and technical realization. A concept of the noise source parameters dynamic assessment is introduced. The idea of noise modeling, based on noise emission characteristics and emission simulations, was developed and practically utilized in the system. Furthermore, the working system architecture and the data acquisition scheme are described. The method for increasing the speed of noise map calculation employing a supercomputer is explained. The practical implementation of noise maps generation and visualization system is presented, together with introduced improvements in the domain of continuous noise monitoring and acoustic maps creation. Some results of tests performed using the system prototype are shown. The main focus is put on assessing the efficiency of the acoustic maps created with the discussed system, in comparison to results obtained with traditional methods.
Źródło:
Archives of Acoustics; 2011, 36, 2; 395-418
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Compensation of Air Absorption of Sound in Scale Model Measurements
Autorzy:
Ćirić, D. G.
Pantić, A.
Powiązania:
https://bibliotekanauki.pl/articles/178131.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic measurements
scale model
air absorption
numerical compensation
Opis:
The absorption of sound in air represents one of the main problems of the scale model measurements. This absorption, especially at higher frequencies, is considerably greater than the value determined by the law of acoustical similarity between the full scale and the scale model. Different alternatives are applied for compensation of the excess air absorption including a numerical compensation. In this paper, a modified approach to numerical compensation is proposed. It is based on compensation of the sound decay only, and not background noise. As a consequence, there is no an increase of background noise in the compensated impulse response. The results obtained by the proposed procedure are compared to the corresponding ones obtained by the other procedures.
Źródło:
Archives of Acoustics; 2012, 37, 2; 219-225
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peculiarities of use of speech acoustic environment while embedding into it of hidden message codes
Autorzy:
Korostil, Y.
Afanasyeva, O.
Powiązania:
https://bibliotekanauki.pl/articles/360624.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
communication channel
model
message
hidden message
acoustic message
Opis:
The problems of embedding of message codes into Acoustic environment of speech are researched. The peculiarities of speech perception by human hearing are analyzed. As an example of acoustic Messager environment and codes of hidden messages embedded into it is reviewed a channel of mobile Communications in the part of transformations which are implemented with acoustic signals. Approach to build a model of process of transmission of speech via non-linear channel basing on imagination about speech signals spectrum is developed. The proposals on methods of use of such models for analysis and interpretation of distortions of signals made by transformations, implemented in example channel are presented.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 33 (105); 46-50
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the Geometry of an Underwater Channel for Acoustic Communication
Autorzy:
Naman, Hala A.
Abdelkareem, A. E.
Powiązania:
https://bibliotekanauki.pl/articles/2174453.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
channel impulse response
geometry channel model
multipath propagation
underwater acoustic communication
Opis:
The achievement of efficient data transmissions via underwater acoustic channels, while dealing with large data packets and real-time data fed by underwater sensors, requires a high data rate. However, diffraction, refraction, and reflection phenomena, as well as phase and amplitude variations, are common problems experienced in underwater acoustic (UWA) channels. These factors make it difficult to achieve high-speed and long-range underwater acoustic communications. Due to multipath interference caused by surface and ocean floor reflections, the process of modeling acoustic channels under the water’s surface is of key importance. This work proposes a simple geometry-based channel model for underwater communication. The impact that varying numbers of reflections, low water depth values, and distances between the transmitter and the receiver exert on channel impulse response and transmission loss is examined. The high degree of similarity between numerical simulations and actual results demonstrates that the proposed model is suitable for describing shallow underwater acoustic communication environments.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 4; 3--12
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Cold Eddy on Acoustic Propagation (Case Study : Eddy in the Persian Gulf)
Autorzy:
Mahpeykar, Omid
Ashtari Larki, Amir
Akbari Nasab, Mohammad
Powiązania:
https://bibliotekanauki.pl/articles/31339990.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Persian Gulf
cold eddy
transmission loss (TL)
acoustic propagation
BELLHOP model
Opis:
It is essential for oceanographers to study the effects of marine phenomena such as currents, surface mixed layer, eddies, internal waves, and other ocean features on acoustic propagation, as most marine measurement equipment operates on this basis, like sonar. The eddy impact on acoustic transmission in the marine environment is very significant because changes in temperature and salinity disrupt the sound speed due to the presence of eddy, thus the acoustic propagation in the sea. Although cold eddies are in the Persian Gulf widely, one eddy is selected to study their impacts on acoustic propagation because they have similar properties in terms of temperature and salinity. In this research, after identifying eddies in the Persian Gulf automatically, the effect of a cold eddy on acoustic propagation was investigated at different depths using the BELLHOP model. Most eddies are cyclonic with 5–10 km of radius based on algorithm outputs. Studies on the lifespan of eddies showed that the occurrence of cyclonic eddies with a lifespan of more than three days is more than anticyclonic ones. Examination of the eddy effect on acoustic propagation showed that the transmission loss (TL) during the progress of the acoustic wave across the eddy increases with increasing the depth of the sound source. Also, the presence of cold eddy compared to the conditions it does not exist increases the transmission loss. The study of three-dimensional acoustic propagation also confirmed the obtained results in two-dimensional mode and clearly showed the role of cold eddy in increasing the TL.
Źródło:
Archives of Acoustics; 2022, 47, 3; 413-423
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Modelling Studies of 400 MHz ST-X Quartz SAW Delay Lines for Potential Gas Sensing Applications
Autorzy:
Thirumal, V.
Raju, B.
Gandhi, P.
Pandya, H. M.
Powiązania:
https://bibliotekanauki.pl/articles/177740.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface acoustic wave
SAW delay line
impulse response model
equivalent circuit model
coupling-of-modes
COM model
SAW sensors
Opis:
Surface Acoustic Wave (SAW) devices like delay lines, filters, resonators etc., are nowadays extensively used as principal solid state components in many electronic applications and chemical vapour sensors. To bring out the best from these SAW devices, computational design and modelling are resorted too. The present paper proposes the modelling of 400 MHz ST-X Quartz based SAW delay line, by three models namely, Impulse Response Model (IRM), Crossed-field Equivalent Circuit Model (ECM) and Coupling-of-Modes (COM) model. MATLAB® is employed as a computational tool to model the experimental output of the SAW device. A comparative discussion of the modelled device results is also provided.
Źródło:
Archives of Acoustics; 2018, 43, 2; 153-161
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dependence of acoustic noise emission on the dissipated energy of plunging waves
Autorzy:
Klusek, Z.
Paprota, M.
Sulisz, W.
Zdolska, A.
Sorek, S.
Powiązania:
https://bibliotekanauki.pl/articles/48920.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
noise emission
acoustic noise
wave breaking
wave energy
energy dissipation
physical model
Źródło:
Oceanologia; 2020, 62, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of the basic acoustic elements models on the base of the VHDL – AMS language for computer-aided design at the schemotechnical level
Autorzy:
Teslyuk, V.
Holovatyy, A.
Alshawabkeh, H. A.
Powiązania:
https://bibliotekanauki.pl/articles/410618.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
microelectromechanical systems (MEMS)
VHDL-AMS model
basic acoustic element
schematic design level
Opis:
In this paper the basic acoustic elements models are developed on the base of the VHDL-AMS language. Constructed models are based on the thin plates theory and are intended to be used in computer-aided design at the schematic level of basic acoustic MEMS elements. The results of the models for basic acoustic elements of piezoelectric and electrostatic types investigation are also presented.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2018, 7, 2; 53-58
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of laminar-to-turbulent transition in a separated boundary layer subjected to an external acoustic forcing
Autorzy:
Kubacki, S.
Rarata, Z.
Drózdz, A.
Gnatowska, R.
Sokolenko, V.
Elsner, W.
Powiązania:
https://bibliotekanauki.pl/articles/38697107.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
laminar-to-turbulent transition
separated boundary layer
acoustic excitation
algebraic intermittency model
Opis:
The new Reynolds-averaged Navier–Stokes (RANS)-based method has been developed for taking into account, in an approximate manner, the effect of external acoustic forcing on laminar-to-turbulent transition in a separated boundary layer. Experimental studies [33] report an increase of the turbulent shear stress within the separated boundary layer under the influence of acoustic forcing. Enhancement of flow disturbances in a reversed flow region was also reported in our experiment. Experimental findings stimulated the development of a reduced-order aero-acoustic strategy. The effect of acoustic forcing was incorporated into the modelling framework of an algebraic intermittency model. The model component was tuned based on our experimental data and validated on reference experiments. The results show the feasibility of the proposed model to simulate flow over a flat plate and the NACA0018 profile.
Źródło:
Archives of Mechanics; 2023, 75, 5; 591-616
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies