Wszystkie pola: dynamic characteristics - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Dynamic characteristics of coarse-grained trickling filters
Autorzy:: Sawicki, J.
Bering, S.
Powiązania:: https://bibliotekanauki.pl/articles/1933154.pdf
Data publikacji:: 2007
Wydawca:: Politechnika Gdańska
Tematy:: hydraulic design
waste disposal
trickling filters
Opis:: A structural method of dimensioning trickling filters is proposed. Reactors applied in sanitary engineering are usually designed on the basis of formally simple technical instructions, but laboratory experiments have shown that the flow through a trickling filter can be described with the plug-flow model. With an additional function describing reaction intensity, the object's parameters can be calculated and its operation simulated for various technical conditions. If variability of the reaction rate is taken into account, numerical integration of the governing equations will be necessary.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 4; 425-437
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Measurement of dynamic characteristics of screw conveyor
Autorzy:: Coranič, Tomáš
Maščeník, Jozef
Ružbarský, Juraj
Krenický, Tibor
Powiązania:: https://bibliotekanauki.pl/articles/2175491.pdf
Data publikacji:: 2022
Wydawca:: STE GROUP
Tematy:: software
modal analysis
screw conveyor
vibration
oprogramowanie
analiza modalna
przenośnik ślimakowy
wibracje
Opis:: A machine has always been, is and will be the technical progress. The basis of every economy is the progressiveness of manufacturing engineering since it manufactures components for all industries. Technical requirements in manufacturing engineering are constantly leading to an increase of the technical level of manufacturing equipment. Profound knowledge of scientific fields precedes a successful fulfilment of the technical requirements. Structural units of manufacturing machines are complex mechanisms that must work reliably and safely with an emphasis on their important function. These units create new objectives for their research and optimization.
Źródło:: Systemy Wspomagania w Inżynierii Produkcji; 2022, 11, 2; 66--76
2391-9361
Pojawia się w:: Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Dynamic characteristics of perspective touristic information technologies
Autorzy:: Artemenko, O.
Kunanec, N.
Pasichnyk, V.
Savchuk, V.
Powiązania:: https://bibliotekanauki.pl/articles/410986.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:: information technologies
tourism
consolidated information
mobile geographic information system
GIS
mobile tourist information technologies
trip support
interface virtualization environment
intellectual systems
Opis:: The article is devoted to modern tendency and problems in the development of information technologies in the sphere of tourism. The aim of this paper is system analysis and identification of prospective areas of information technology in the field of tourism. The basic trends shaping the prospects for improvement in the information technology tools oriented to full and quality to meet the needs of ordinary tourists are consolidation of information resources in tourism; intellectualization of functions for software and applications, information technology and systems; interface virtualization environment for information systems, oriented to the needs of tourists; mobilization of tourists information technology support in the exercise of his trip; personalization tourist information needs, taking into account its specific individual requests tastes and preferences. All of them are analysed and described in the article. As a result author distinguished the main problems in the sphere of information technologies for tourist domain and main perspective spheres of next researches.
Źródło:: ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 4; 107-118
2084-5715
Pojawia się w:: ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Rational determination of dynamic characteristics of fluid-flow reactors
Autorzy:: Sawicki, J. M.
Powiązania:: https://bibliotekanauki.pl/articles/241307.pdf
Data publikacji:: 2005
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:: fluid-flow reactors
waste treatment
dispersion
Opis:: A new model for water treatment and waste disposal reactors was developed. The startpoint to this model is a "triangular" approximation in the shape of the real flow-through curve. This approximation is defined by some characteristic points of time, which are strongly related to the characteristic velocities of wastewater. Combination of this simplified function with the kinetic equation of the reaction of the 1st order yields the sequence of the governing equations. Three practical examples show that the proposed "rational" model gives much better results than the traditional plug-flow model.
Źródło:: Archives of Hydro-Engineering and Environmental Mechanics; 2005, 52, 3; 177-193
1231-3726
Pojawia się w:: Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Dynamic characteristics of linear rolling bearings for machine tools
Autorzy:: Sakai, Y.
Tsutsumi, M.
Powiązania:: https://bibliotekanauki.pl/articles/99770.pdf
Data publikacji:: 2013
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: damping
linear rolling bearing
response function
dynamic
Opis:: The present paper proposes a method for evaluating the dynamic characteristics of a single linear rolling bearing subjected to a radial force and a bending moment. In order to evaluate the damping of a rail-carriage system, a rectangular column with a flange is fixed to the carriage by bolts, and the free end of the column is excited by an impulse hammer in the horizontal (x), lateral (y), and radial (z) directions. The response is detected by an accelerometer mounted to the flange of the column. Both force and acceleration are input to an FFT analyzer, and the frequency response function (FRF) is calculated. The damping capacity in each direction is evaluated as a modal damping ratio, which is calculated based on the FRF. As a result, the damping ratio of the vibration mode in the feed (x) direction is higher than those of the other vibration modes. In addition, the influence of the nonlinearity of the linear rolling bearings on the dynamic characteristics is investigated. The results reveal that the dynamic characteristics of the linear rolling bearings depend on the excitation direction.
Źródło:: Journal of Machine Engineering; 2013, 13, 3; 129-142
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Dynamic characteristics and stability of high speed cylindrical journal bearing
Autorzy:: Strzelecki, S.
Powiązania:: https://bibliotekanauki.pl/articles/127842.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:: cylindrical journal bearing
dynamic characteristics
stability
walcowe łożysko ślizgowe
charakterystyki aerodynamiczne
stabilność
Opis:: The operation of plain circular journal bearing at high speed is restricted by the excessive temperature that is generated in the oil film and by the loss of stability. Low costs of machining, high-transmitted loads are the advantages of these types of bearings. Better knowledge of bearing operation and its stability from the point of hydrodynamic theory of lubrication and theory of vibration can be affected by modifications of bearing design. These modifications should result in the higher speeds of operation, decrease in power losses and better bearing stability. The basis of stability determination is the dynamic characteristics of bearing. For the plain circular journal bearing the dynamic characteristics has been calculated. Stability of high speed, symmetric rotor was determined, too. Different values of bearing length to diameter ratio, and relative clearance were assumed. Reynolds', energy and viscosity equations were solved by means of iterative procedure. Adiabatic oil film, laminar flow in the bearing gap as well as aligned orientation of journal in the bearing was considered.
Źródło:: Vibrations in Physical Systems; 2018, 29; 1-9
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Dynamic characteristics of the proton exchange membrane fuel cell module
Autorzy:: Cieśliński, J. T.
Kaczmarczyk, T. Z.
Dawidowicz, B.
Powiązania:: https://bibliotekanauki.pl/articles/240068.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: PEM fuel cell
hydrogen
dynamic characteristics
ogniwo paliwowe PEM
wodór
charakterystyka dynamiczna
Opis:: The paper describes a fuel cell based system and its performance. The system is based on two fuel cell units, DC/DC converter, DC/AC inverter, microprocessor control unit, load unit, bottled hydrogen supply system and a set of measurement instruments. In the study presented in the paper a dynamic response of the proton exchange membrane (PEM) fuel cell system to unit step change load as well as to periodical load changing cycles in the form of semi-sinusoidal and trapezoidal signals was investigated. The load was provided with the aid of an in-house-developed electronic load unit, which was fully PC controlled. The apparatus was commissioned by testing the steady-state operation of the module. The obtained efficiency of the fuel cell shows that the test apparatus used in the study provides data in substantial agreement with the manufacturer’s data.
Źródło:: Archives of Thermodynamics; 2018, 39, 4; 125--140
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Modelling method of dynamic characteristics of marine thin-walled structure
Autorzy:: Doan, Do Van
Szeleziński, Adam
Murawski, Lech
Muc, Adam
Powiązania:: https://bibliotekanauki.pl/articles/245078.pdf
Data publikacji:: 2019
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: thin-walled structure
vibration
FEM
rectangular plate
Patran-Nastran software
Opis:: Thin-walled structures are very popular in industries, especially in the field of shipbuilding. There are many types of equipment and structures of ships, which are made up of thin-walled structures such as hull, deck and superstructure. Therefore, the analysis and understanding of the static and dynamic characteristics of a thin-walled structure are very important. In this article, we focus on vibration analysis of a typical thin-walled structurerectangular plate, a basic structure of the hull. Vibration analysis of a rectangular thin plate is conducted by two methods: numerical modelling method of the finite element on Patran-Nastran software platform and experimental method implemented in the laboratory of Gdynia Maritime University. Thin rectangular plate is fixed one end by four clamping plates and is modelled with finite elements and different meshing densities. The numerical model of thin rectangular plate is divided into four cases. Case 1, thin rectangular plate, and clamping plates are modelled with two-dimensional elements. Case 2, the rectangular thin plate is modelled with two-dimensional elements; the clamping plates are modelled with three-dimensional elements. Case 3, both the rectangular thin plate and clamping plates are modelled with three-dimensional elements. Case 4, the rectangular thin plate, and clamping plates are modelled with three-dimensional elements with larger mesh density to increase the accuracy of the calculation results. After that, the results of vibration analysis according to the numerical modelling method on Patran-Nastran software platform for these cases were compared with the measurement results. From there, assess the accuracy of analysis results of selected numerical model methods and the ability to widely apply this numerical model method to other marine structures
Źródło:: Journal of KONES; 2019, 26, 4; 39-46
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Dynamic characteristics of magnetic coupling in horizontal axis wave energy device
Autorzy:: Zhang, J.
Liu, Y.
Liu, J.
He, T.
Xie, Y.
Powiązania:: https://bibliotekanauki.pl/articles/258488.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: wave energy
magnetic coupling
dynamic characteristics
transfer function
step response
steady state error
Opis:: To solve the dynamic response problems of magnetic coupling in the horizontal axis wave energy device, this has researched the dynamic characteristicsof magnetic coupling. The fitting formula about torque and angle of the magnetic coupling is obtained through experiments. The mathematical models of the magnetic coupling torque transmission are established. The steady state error of the magnetic coupling and the transfer function of the output angle are obtained. The analytical solution of the step response of the output angle in time domain is derived. The influence of the torsional rigidity, the damping coefficient and the driven rotor’s rotational inertia on dynamic characteristics of the magnetic coupling isanalyzed. According to the analysis results, the design rules of magnetic coupling are proposed.
Źródło:: Polish Maritime Research; 2017, S 3; 165-170
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Diagnostic benchmarks on dynamic characteristics of thin-walled marine damaged structures
Autorzy:: Szeleziński, Adam
Murawski, Lech
Muc, Adam
Powiązania:: https://bibliotekanauki.pl/articles/2064867.pdf
Data publikacji:: 2019
Wydawca:: STE GROUP
Tematy:: thin-walled structures
welded joints
SHM
spectrum analysis
damping decrement
Opis:: Among structural health monitoring (SHM) methods of thin-walled structures, a vibrodiagnostic method is one of the most promising. The accelerometer recorded responses provide diagnostic information that requires mathematical processing to extract the essential dynamic characteristics. The authors have been looking for new parameters - diagnostic benchmarks which can be applied to non-destructive, automatic testing of thin-walled marine structures (especially their welded joints) like ship hulls. All characteristics have been based on recorded data generated during the vibration tests of welded joints with and without failures. For this purpose, the authors proposed method based on: FFT windowing analysis, benchmark with using 2D or 3D time – frequency dynamic characteristics and the determination of damping decrement in function of time. The work presents the algorithm and exemplary results obtained from the application of proposed method to several selected sample plates with different type of welds.
Źródło:: Multidisciplinary Aspects of Production Engineering; 2019, 2, 1; 38--52
2545-2827
Pojawia się w:: Multidisciplinary Aspects of Production Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Approximate method for determination of dynamic characteristics of structures with viscoelastic dampers
Autorzy:: Lewandowski, R.
Powiązania:: https://bibliotekanauki.pl/articles/127718.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:: structures
viscoelastic damper
generalized fractional model
dynamic characteristics
struktury
tłumik lepkosprężysty
uogólniony model ułamkowy
charakterystyka dynamiczna
Opis:: An approximate method for determination of dynamic characteristics of structures with viscoelastic dampers is proposed in this paper. A fractional derivative is used to describe the dynamic behaviour of viscoelastic dampers. The method is based on a continuous dependency of the sensitivity of eigenvalue on a certain artificially introduced parameter which scaled up the influence of the damping term in the eigenvalue problem. Some results of a representative calculation are also presented and briefly discussed.
Źródło:: Vibrations in Physical Systems; 2016, 27; 219-226
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Numerical and experimental investigation on nonlinear dynamic characteristics of planetary gear train
Autorzy:: Zhang, Jianwu
Guo, Han
Yu, Haisheng
Zhang, Tong
Powiązania:: https://bibliotekanauki.pl/articles/1839620.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: deep hybrid transmission
power split devices
lumped parameter model
dynamic instability
Opis:: A deep hybrid electric vehicle (DHEV) equipped with a Ravigneaux compound planetary gear train (PGT) encounters severe gear whine noises during acceleration in the EV drive mode. For the analysis of vibro-acoustic sources, a 5DOF lumped-parameter vibration model for the PGT dynamic system is established as well as sound pressures radiated from the transmission on a test bench are measured for data processing and recognition. By comparison between numerical and experimental analyses, natural vibration modes of the PGT are examined and high frequency modal resonances in association with the planetary gears are observed only to cause narrow band whine noises. Furthermore, a 2DOF reduced dynamic model for the planetary gears with consideration of nonlinearities such as time-varying mesh stiffness and backlash is proposed, and numerical solutions to bifurcations and dynamic instabilities of the two sets of planetary gears are obtained. It is found that nonlinear vibration behaviour of the long and short planets are major causes of shock and vibration of the hybrid transmission. Severe vibro-acoustic noises excited dominantly by the planetary gears are alleviated after implementing micro-geometry modifications to the PGT.
Źródło:: Journal of Theoretical and Applied Mechanics; 2020, 58, 4; 1009-1022
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Analiza cech dynamicznych obciążonego akumulatora
Analysis of the loaded battery dynamic characteristics
Autorzy:: Dyga, Grzegorz
Pszczółkowski, Józef
Powiązania:: https://bibliotekanauki.pl/articles/250255.pdf
Data publikacji:: 2015
Wydawca:: Instytut Naukowo-Wydawniczy TTS
Tematy:: akumulator
prąd
battery
electricity
Opis:: W artykule scharakteryzowano proces powstawania prądu elektrycznego w akumulatorze kwasowym, w którym następuje rozpad cząstek na jony oraz reakcje przebiegające na anodzie i katodzie podczas jego działania. Przedstawiono wyniki badań i tendencje zmian SEM polaryzacji akumulatora w warunkach obciążenia prądowego. Dokonano analizy intensywności jej zmian w funkcji temperatury i natężenia prądu obciążenia podczas wyładowania akumulatora. Porównano wartości stałych czasowych akumulatora obciążonego i po wyłączeniu obciążenia.
The article describes the process of creating an electric current in the acid battery by disintegration of particles on ions, the reaction proceeding at the anode and the cathode during operation. The results of research and trends of the electromotive force of the battery polarity under current load conditions are presented. The analysis of its changes intensity as a function of temperature and load current during battery discharge is made. There are compared of constant times of the loaded battery and after load switching.
Źródło:: TTS Technika Transportu Szynowego; 2015, 12; 1837-1842, CD
1232-3829
2543-5728
Pojawia się w:: TTS Technika Transportu Szynowego
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Dynamic characteristics of Sv, representing diel variability of fish within full depth range
Autorzy:: Orłowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/331842.pdf
Data publikacji:: 1999
Wydawca:: Polskie Towarzystwo Akustyczne
Opis:: Acoustic methods could play an important role in monitoring vertical and horizontal fish distribution; including fish stock assessment, however the fish as acoustic target is not precisely specified still. The paper describes a new type of approach to express diel variability of acoustic parameter Sv, characterizing fish volume density. Multi-depth-channel integration of fish echoes was applied to estimate the average dil models of Sv dependence on time of a day. The final characteristics was calculated by computer as a vectoral field, showing quasi-continuous diel transformation of depth distribution of Sv values. Example based on data collected during October 1996 RV "Baltica" research cruise was given and discussed. Strong variability of Sv values with time and depth was exposed and clearly different diel phases of fish behaviour were separated. Results indicate a necessity of further research on fish target strength within separate periods of a diel cycle, to define more accurately biomass conversion factors. The method shown could enreach significantly systematic physiotogical studies on fish behaviour also.
Źródło:: Hydroacoustics; 1999, 2; 15-20
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Time – frequency dynamic characteristics 2D in the quality assessment of welded joints
Autorzy:: Szeleziński, A.
Muc, A.
Murawski, L.
Powiązania:: https://bibliotekanauki.pl/articles/244249.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: welding
welded joints
non-destructive testing
NDT
SHM
vibrations
time–frequency characteristics
Opis:: The authors of the article have been looking for a new parameters and dynamic characteristics, which can be applied to non-destructive testing of welded joints. All characteristics have been based on recorded data generated during the vibration tests of welded joints with and without failures. The article deals with the methods of assessing welding joints using 2D: time – frequency dynamic characteristics. A calculation procedure used for analysing simultaneous changes of the response modules, registered by acceleration sensors was presented. Vibrations amplitudes were transformed to a function of time and frequency (simultaneously) and presented over 2D time – frequency characteristics. The analyses of the characteristics were performed for a plate without any welded joint, for a plate with non-defected welded joint and for a plate with a welded joint defected by an edge bonding. Having analysed registered 2D time – frequency dynamic characteristics it can be noticed that presenting the responses analysed simultaneously over the time and frequency allows evaluating if examined system maintains non-linearity and, at the same time, it allows to indirectly assess the quality of the welded joint. The proposed measure parameters of the quality of a welded joint can be defined as a dispersion of colours on the obtained characteristics. The faults (and the vibration nonlinearity) of the welded joints is bigger if the dispersion is greater.
Źródło:: Journal of KONES; 2018, 25, 2; 357-361
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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