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Wyświetlanie 1-4 z 4
Tytuł:
Study of vibration control using laboratory test rig of wind turbine tower-nacelle system with MR damper based tuned vibration absorber
Autorzy:
Martynowicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/201323.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wind turbine vibration
tower-nacelle laboratory model
tuned vibration absorber
MR damper
tower vibration control
turbina wiatrowa
wibracje
system tower-nacelle
model laboratoryjny
tłumik drgań
MR
przepustnica
kontrola drgań
Opis:
Wind turbine tower dynamic stress is related to the fatigue wear and reliability of the whole wind turbine structure. This paper deals with the problem of tower vibration control using a specially designed and built laboratory model. The considered wind turbine tower-nacelle model consists of a vertically arranged stiff rod (representing the tower), and a system of steel plates (representing nacelle and turbine assemblies) fixed at its top. The horizontally aligned tuned vibration absorber (TVA) with magnetorheological (MR) damper is located also at the top of the rod (in nacelle system). Force excitation sources applied horizontally to the tower itself and to the nacelle were both considered. The MR damper real-time control algorithms, including ground hook control and its modification, sliding mode control, linear and nonlinear (cubic and square root) damping, and adaptive solutions are compared to the open-loop case with various constant MR damper input current values and system without MR TVA (i.e., MR TVA in “locked” state). Comprehensive experimental analyses and their results are presented.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 2; 347-359
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical studies of suspension system with double spring loaded using the force pulse
Autorzy:
Krason, W.
Wysocki, J.
Powiązania:
https://bibliotekanauki.pl/articles/244918.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
dependent motor truck suspension
double multi-leaf spring
viscous damper
numerical analysis
FEM
zależne zawieszenie samochodu silnikowego
podwójna sprężyna wielopłatowa
lepka przepustnica
analiza numeryczna
MES
Opis:
The forced vibration of a dependent rear suspension model of the two-axle vehicle, equipped with a 3D model of a double spring and a viscous shock absorber is the subject of consideration. The clearance between the master and auxiliary springs is a specificity of the double suspension construction. Dynamic analysis of such a system has been performed by forcing with different forms of force pulses using the fixed base of force 10 kN. Three different time runs (two trapezoidal and one triangular model) are used as the force impulses. Modelling and analysis taking into consideration contact problems have been developed using the MSC.Software package with a special use of Patran pre-processor and Nastran solver. A finite element method (FEM) has been used in numerical analysis of the suspension model with geometric nonlinearities, viscous damping [9] and time-varying load. The boundary conditions of numerical models correspond to a spring support in the real vehicle suspension. The non-periodic damped vibrations and damped free vibrations of the simplified suspension system are investigated during numerical analysis. Selected results of the model tests have been presented in the form of the timings of the accelerations of the spring elements and of the forces in the suspension damper.
Źródło:
Journal of KONES; 2018, 25, 1; 241-248
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of air flow velocity distribution in the intake system of an SI engine
Autorzy:
Kołodziej, S.
Ligus, G.
Mamala, J.
Augustynowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/133847.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
intake manifold
PIV
flow
throttle
filling ratio
układ dolotowy
PIW
przepływ
przepustnica
stopień napełnienia
Opis:
The conditions of air flow in the intake determine power generated by the engine to a large extent. The biggest resistances in flow of the air sucked or pumped into the engine are generated by the throttle, which is at the same time the main component which allows for regulation of engine power. For the purpose of research conducted in this work, time density of engine work points in analyzed velocity profiles was determined with the use of Engine Road Load Simulator. Thanks to the knowledge of time velocity, it was possible to determine throttle positions at which the engine operates most frequently. With the use of image analysis methods, obtained parameters were experimentally researched, considering flow disturbances which are the effect of air flow through the throttle and uneven air distribution in the intake manifold of a four-cylinder engine.
Źródło:
Combustion Engines; 2017, 56, 2; 152-157
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aeroacoustical study of the serrated ventilation dampers
Autorzy:
Kopania, Joanna Maria
Bogusławski, Grzegorz
Wójciak, Kamil
Gaj, Patryk
Powiązania:
https://bibliotekanauki.pl/articles/24201973.pdf
Data publikacji:
2022
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
aeroacoustics
ventilation
plane damper
serrated edge
aeroakustyka
wentylacja
przepustnica jednopłaszczyznowa
krawędź ząbkowana
Opis:
The serrated ventilation dampers for regulation of airflow volume were tested. The computer fluid flow analysis was conducted using the Comsol program. The nature of the flow through the serrated ventilation damper was analyzed to identify the different turbulence regions formed on the airflow field. Additionally, the aerodynamical and acoustical parameters of these blades of ventilation dampers with different serrated trailing and/or leading-edge were studied. The aeroacoustic studies were done in the reverberation room. The sound power level and loss coefficient were determined for the studied models.
Źródło:
Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022313
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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