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Wyszukujesz frazę "vibration damping" wg kryterium: Temat


Tytuł:
Indicator of vibroacoustic energy propagation as a selection criterion of design solution
Autorzy:
Klekot, G.
Powiązania:
https://bibliotekanauki.pl/articles/176843.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vibration damping
vibroacoustic energy propagation
Opis:
Contemporary tools which help to design technical objects refer to the conclusions drawn from studying the changes of physical processes accompanying the exploitation, especially to vibroacoustic processes. The main problem is to define such vibroacoustic measures, where their changes would model the analyzed physical phenomena in the best way. Basing on simple indicators which refer to occurring phenomena, it is possible to obtain accurate solutions with a satisfactory reliance level without using complex computing techniques needing detailed descriptors. According to the author, the indicators which are based on the analysis of vibroacoustic energy propagation are very useful in solving engineering problems. These indicators are useful while diagnosing the condition of technical systems, identifying and minimizing the vibroacoustic risks. The possibilities of using such indicators in order to find design solution are illustrated by sample results of the research of the structures with vibroacoustic elements which reduce the noise of rail vehicles by the rail vibration damping.
Źródło:
Archives of Acoustics; 2013, 38, 4; 489-494
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced multi-functional coatings for vibration control of machining
Autorzy:
Rashid, Masud-U
Guo, Shuai
Adane, Tigist Fetene
Nicolescu, Cornel Mihai
Powiązania:
https://bibliotekanauki.pl/articles/99791.pdf
Data publikacji:
2020
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
vibration damping
nanocomposite
damping coating
friction
cutting process
Opis:
The paper present theoretical and experimental studies of the energy dissipation performance of a composite structure composed in a multilayer nano-composite damping coating applied on a tungsten carbide shim and placed beneath the cutting insert. The coated shim placed closed to the cutting zone is subjected to high compressive and shear stresses as well as high temperature. Therefore, apart from high damping capacity it requires high stiffness and high thermal resistance. The coated shim dissipates the high frequency oscillations produced at the tool-chip and tool-workpiece interfaces during the chip forming process. The use of coated shims demonstrates that the tool life is considerably extended, while the machined surface integrity is improved. The Reuss model of the composite structure composed of a phase with a stiff, low loss factor and a phase with high loss factor is used to calculate the optimal coating thickness that gives high loss factor combined with high stiffness. The synthesis process of the coating material using HiPIMS process is discussed. The physical characteristics of the coating and the machining performance are presented in the experimental section.
Źródło:
Journal of Machine Engineering; 2020, 20, 1; 5-23
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control-oriented modelling and control of rotor vibration
Autorzy:
Gosiewski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/387200.pdf
Data publikacji:
2008
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
drgania wirnika
tłumienie drgań
rotor vibration
vibration damping
Opis:
Deep analysis of the control plant brings many useful information for the designer of the control system. The analysis is also important part in the design of active vibration control system. The coupling of different dynamical phenomena in rotating machinery leads to unstable vibrations. Usually, the coupling effects are caused by changing parameters. Angular speed or rotor unbalance in some applications are such parameters which change in the wide range. The problem is to find for which angular speeds we have unstable torsional/lateral vibrations. Usually, the unstable regions are in the vicinity of angular speeds where maps of natural frequencies for both dynamical systems cross each other. In the paper there was explained which intersection of torsional and lateral natural frequencies are unstable and why. The root locus method was used to explain the phenomenon. It indicated such control procedures which amplify the positive (stabilizing) mechanisms in the rotor dynamics. Such procedures can also lead to the energy saving control laws. In the case of lateral vibrations there were considered four control strategies. And these strategies were compared to indicate optimal one.
Źródło:
Acta Mechanica et Automatica; 2008, 2, 2; 21-38
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of dynamic properties and movement safety of bogies with diagonal links and rubber-metal vibration absorbers between the rubbing elements of freight cars
Autorzy:
Karassayeva, Assel
Adilkhanov, Yerzhan
Sekerova, Sholpan
Japayev, Saduakhas
Zhauyt, Algazy
Zhunisbek, Seitbek
Tergemes, Kazhybek
Powiązania:
https://bibliotekanauki.pl/articles/1833774.pdf
Data publikacji:
2021
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
freight car
qualities
CSM
polymer
vibration damping
Opis:
This article aims to study experimentally the dynamic properties and traffic safety actions for gondola cars with bogies with diagonal links, operated on the territory of the Republic of Kazakhstan. The main results obtained during tests of gondola cars on bogie with diagonal links when they move along straight and curved sections as well as on switches are presented. The estimation of: dynamics coefficients, stability margin coefficients against derailment, lateral forces transmitted from the wheel to the rail, ratio of frame forces to a static load from the wheelset on the rails, and accelerations are made. The paper analyses the simulation of a polymer layer of rubber vibration absorber, to be installed between the rubbing surfaces, such as the link side of frame axle unit, and host unit is open-bearing, with lateral support of the three-piece freight car bogies, operating on the territory of the Commonwealth of Independent States. The model developed in this article consists of a rheological model of a Maxwell cell, a Fancher spring and an element which has the function of non-linearity. The simulation model can be used to study the characteristics of vibration dampers, gaskets and other power elements that have polymer properties and are installed at other types of transport and not only.
Źródło:
Journal of Machine Engineering; 2021, 21, 3; 124--143
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neural network control design considerations for the active damping of a smart beam
Autorzy:
Cupiał, P.
Łacny, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/280299.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
neural network control
smart structures
vibration damping
Opis:
In this study, possible options for the active damping of a smart beam with piezoelectric patches using neural network control algorithm, are presented. The algorithms used for the control are Neural Direct Inverse and Feedback Linearisation (NARMA-L2). Additionally, several possible modifications used for the purpose of improving the control, such as different values of control gain or sampling time of the training data, as well as step-wise control are tested.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 4; 767-774
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control design of semi-active seat suspension systems
Projekt systemu sterowania semi-aktywnym układem zawieszenia siedziska
Autorzy:
Maciejewski, I.
Krzyżyński, T.
Powiązania:
https://bibliotekanauki.pl/articles/281846.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
vibration damping
semi-active suspension
control system
Opis:
The paper deals with the control design of semi-active seat suspension systems. A semi-active vibration control strategy basing on the inverse dynamics of a spring or damper element and a primary controller is studied. The optimisation procedure proposed in the paper makes it possible to calculate controller settings and these, in turn, to define vibroisolation properties of semi-active suspension systems.
W pracy przedstawiono sposób projektowania systemu sterowania semi-aktywnym układem zawieszenia siedziska. Analizowano algorytm sterowania semi-aktywnego, który bazuje na modelu odwrotnym elementu sprężystego lub tłumiącego oraz na kontrolerze głównym. Procedura optymalizacji zaproponowana w pracy dodatkowo wspomaga dobór nastaw regulatora, ktore to nastawy definiują właściwości wibroizolacyjne semi-aktywnego układu zawieszenia.
Źródło:
Journal of Theoretical and Applied Mechanics; 2011, 49, 4; 1151-1168
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical model of fricional damper for glas – making robot lance
Autorzy:
Stembalski, M.
Skoczyński, W.
Roszkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/247991.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
robot
vibration damping
friction damper
numerical model
damping decrement
Opis:
The need to design a friction damper for glass-making robots arose because of the excessive vibrations, which occur in the course of their work. The robots are commonly used in the manufacture of glassware. The vibrations adversely affect the work of ball gatherers, which results in a large number of defects in the finished glass products. As a result of the vibrations molten glass may become unevenly distributed on the ball's surface and as the material flows down the ball into the mould the thermal conditions of its solidification may change. It is proposed to damp the vibrations by means of a prototype friction damper mounted directly on the ball gatherer lance. The glass-making robot lance with the friction damper was modelled. The vibrations of the glass-making robot lance tip under static load and impact excitation were measured during simulations. Also the relative displacements of the damper rings in the course of the excitations were measured. Moreover, the dependence between the preload force and the system's damping decrement was determined. The main aim was to select proper operating parameters for the proposed structure in order to obtain maximum system damping.
Źródło:
Journal of KONES; 2012, 19, 1; 391-398
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Torsional vibration silencers used in vessels propulsion systems
Autorzy:
Homik, W.
Powiązania:
https://bibliotekanauki.pl/articles/359576.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
crankshaft vibration
longitudinal vibration
torsional vibration of crankshaft
torsional vibration damping
Opis:
The main source of vibration in the engine piston is the work of the piston – crank, and swapping reciprocating motion to the rotary motion. In this paper are described among others the crankshaft vibration which result in the occurrence of cyclic forces such as forces pressure of gas and inertia forces. In addition were made the analysis of longitudinal vibration of the crankshaft, which are these vibrations are an important problem in high-power vessels’ engines. Regardless of the dynamic system in which the engine is running the greatest threat for crankshaft are the torsional vibrations. The possibilities of vibration damping of the crankshaft in the engine also were discussed.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 40 (112); 9-16
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal Design of Piezoelectric Actuators for Shunt Damping Techniques
Autorzy:
Neubauer, M.
Powiązania:
https://bibliotekanauki.pl/articles/176597.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
piezoelectric transducer
piezoelectric shunt damping
piezoelectric energy harvesting
vibration damping
Opis:
In vibration control with piezoceramics, a high coupling of the piezoelement with the structure is desired. A high coupling improves the damping performance of passive techniques like shunt damping. The coupling can be influenced by a the material properties of the piezoceramics, but also by the placement within the structure and the size of the transducer. Detailed knowlegde about the vibration behavior of the structure is required for this. This paper presents an in-depth analysis of the optimal shape of piezoelectric elements. General results for one-dimensional, but inhomogeneos strain distribution are provided. These results are applied to the case of a longitudinal transducer and a bending bimorph. It is obtained that for maximum coupling, only a certain fracture of the volume should be made of piezoelectric material. . .
Źródło:
Archives of Acoustics; 2014, 39, 4; 615-622
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane problemy optymalizacji pneumatycznego zespołu amortyzującego
Selected problems of pneumatic damping system optimisation
Autorzy:
Kiczkowiak, T.
Maciejewski, I.
Krzyżyński, T.
Powiązania:
https://bibliotekanauki.pl/articles/158411.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
amortyzacja drgań
pneumatyka
optymalizacja
vibration damping
pneumatics
optimisation
Opis:
W pracy przedstawiono model matematyczny zespołu amortyzującego zawierającego sprężynę pneumatyczną w postaci siłownika pneumatycznego współpracującego ze zbiornikiem dodatkowym. Sformułowano zadanie optymalizacyjne z dwoma kryteriami (przyspieszeniowym i przemieszczeniowym) i wykorzystując system Matlab Simulink przeprowadzono jego rozwiązanie. W pracy przedstawiono wyniki obliczeń i trudności jakie autorzy napotkali. Przeanalizowano przyczyny tych problemów i wskazano jak im ewentualnie zapobiec. Praca stanowi wycinek szerszych badań prowadzonych przez autorów.
The paper deals with modelling and numerical investigations of a vibration damping system containing the pneumatic spring connected to an additional air reservoir. The pneumatic spring is built on the basis of pneumatic cylinder, therefore its effective area is constant and does not depend on the pneumatic spring deflection. A guidance mechanism, which is used for suspending the isolated object, is not taken into account in this paper. Using simulation model of this system, the optimisation procedure is proposed in order to improve dynamic properties of the vibration damping structure. The maximum magnitude of the system transfer function and the maximum relative displacement of the suspension are chosen to be conflicting optimisation criteria. The decision variables are defined as the system parameters that have an influence on the viscoelastic force characteristics of the vibration damping system. The optimisation task formulated in this way is solved with use of Matlab Simulink software. The paper presents the optimisation results and describes the difficulties met. The difficulties are analysed and some practical directions for other researchers are pointed out. This paper is only a part of the complex investigations performed by the authors.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 4, 4; 349-354
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration analysis of a half-car model with semi-active damping
Autorzy:
Ferdek, U.
Łuczko, J.
Powiązania:
https://bibliotekanauki.pl/articles/279944.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
semi-active damper
vibration damping
car suspension
hysteresis
Opis:
In this paper, analysis of a half-car model with linear and nonlinear semi-active dampers is performed. Using Matlab-Simulink software, a response of the system to a harmonic excitation of variable frequency and to an impulse excitation is found. The effect of both the distribution of spring-supported mass and the asymmetry of the support on the frequency characteristics of velocities and displacements at the mounting points of the dampers are analyzed. Additionally, characteristics of forces generated by the semi-active dampers and the response of the system when crossing an obstacle are determined.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 321-332
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damping of torsional vibrations of ship engine crankshafts – general selection methods of viscous vibration damper
Autorzy:
Chomik, W.
Powiązania:
https://bibliotekanauki.pl/articles/260606.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
torsional vibrations
torsional vibration damping
torsional vibration dampers
crankshaft
natural vibration frequency
Opis:
This paper describes causes of torsional vibrations generated in ship engine crankshafts. Means for damping the torsional vibrations as well as general methods for selection of viscous torsional vibration dampers for a given type of engine are also presented. Exemplary results of calculations connected with selection of a viscous torsional vibration damper intended for a six-cylinder engine, are attached.
Źródło:
Polish Maritime Research; 2011, 3; 43-47
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration analysis for vehicle with vacuum packed particles suspension
Autorzy:
Makowski, M.
Zalewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/282085.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Vacuum Packed Particles
vibration damping
semi-active
smart materials
Opis:
The paper concerns an effect of the damping force controlling a vehicle suspension system. The investigated vehicle suspension system consists of innovatory Vacuum Packed Particles controllable dampers which allow controlling the vehicle body vibration. The main objective of performed and presented in the paper studies is to determine properties of the Vacuum Packed Particles (VPP) damper and propose a preliminary control strategy. The control in the vehicle suspension system can be realized by controlling the underpressure resulting in various jamming mechanisms in the granular core. Some algorithms of vibration control are also proposed and discussed.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 1; 109-117
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-regulating resonance vibration damping system
Autorzy:
Zejer, Tomasz
Olesiński, Maciej
Musioł, Kacper
Okoń, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2146615.pdf
Data publikacji:
2020
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
vibratory conveyor
resonance vibration damping
przenośnik wibracyjny
tłumienie drgań rezonansowych
Opis:
Vibrating conveyors are widely used in the industry for transportation of bulk materials. A special application of vibrating conveyors is dosing such materials precisely, which is often required by technological processes. The application of the conveyors driven by inertia vibrators for this purpose requires both the conveyor’s operation close to its natural frequency and overcoming the resonance frequencies during the start-up and coasting of the device. Transitioning through the resonance zones and operating with near-resonance frequencies may cause uncontrolled spillage of the feed from the conveyor chute, which is the reason why such solutions have been thus far impossible to apply in industrial practice. The article describes the concept of the resonant vibration damping system designed to minimize the amplitude of vibration in transient states and to enable operation of the conveyor close to the resonant frequency. The basis of the presented solution is an automatic change in the amplitude of the damper’s movement - small within the steady state of operation, and large within the near-resonant frequency.
Źródło:
Vibrations in Physical Systems; 2020, 31, 3; art. no. 2020325
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Piezoelectric shunt damping for alpine ski traction improvement
System tłumienia drgań z wykorzystaniem materiałów piezoelektrycznych dla poprawy własności trakcyjnych nart zjazdowych
Autorzy:
Rajek, M.
Lubieniecki, M.
Pieczonka, Ł.
Uhl, T.
Powiązania:
https://bibliotekanauki.pl/articles/327164.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
vibration damping
shunt damping
piezoelectric patches
drgania
tłumienie drgań
materiał piezoelektryczny
element piezoelektryczny
Opis:
The paper investigates the problem of improving driveability of alpine skis. That properties depend largely on the vibration behavior of a ski under different snow conditions. There is a broad range of methods to deal with vibration damping, both active and passive, that have been described in the literature. In this paper the passive approaches were taken into consideration. It is due to the specific nature of the sport where use of external sources of energy may be impractical. Passive shunt damping system has been designed for a commercially available model of an alpine ski. The performance of the designed system has been evaluated on a numerical model of the ski. Piezoelectric patches have been included in the model by means of a generalized impedance that complies both the mechanical properties and shunted circuit electrical properties. The fraction of strain energy stored in a piezoelectric element at particular vibration modes were used to evaluate the maximum damping coefficient for first three resonant modes that have the largest influence on the ski properties. The damping system is based on piezoelectric patches that can be easily embedded in the laminated structure of a ski.
W artykule przeprowadzono analizę możliwości poprawy własności jezdnych nart zjazdowych z wykorzystaniem materiałów piezoelektrycznych. Właściwości jezdne narty zależą w dużej mierze od ich własności dynamicznych i drgań wzbudzanych podczas jazdy w różnych warunkach śniegowych. Do tej pory podejmowano próby wykorzystania zarówno metod pasywnych jak i aktywnych dla poprawy trakcji. W artykule wzięto pod uwagę tylko metody pasywne, odrzucając metody aktywne ze względu na konieczność użycia zewnętrznego źródła zasilania co uznano za niepraktyczne w omawianym zastosowaniu. W artykule przedstawiono pasywny układ tłumienia drgań typu „shunt damping”, który został zaprojektowany dla wybranego komercyjnego modelu nart zjazdowych. Działanie zaproponowanego układu przeanalizowano na uprzednio z walidowanym modelu numerycznym. Wpływ elementów piezoelektrycznych oraz bocznikującego układu elektrycznego uwzględniono stosując metodę impedancyjną oraz posługując się uogólnionym współczynnikiem sprzężenia elektromechanicznego. Ułamek energii odkształcenia sprężystego danej postaci zawarty w materiale piezoelektryka został wykorzystany do wyliczenia możliwych do uzyskania maksymalnych współczynników tłumienia modalnego dla pierwszych trzech postaci, najbardziej znaczących z punktu widzenia własności jezdnych. System tłumienia drgań został tak zaprojektowany, aby mógł być w prosty sposób zaimplementowany w konstrukcji nart zjazdowych.
Źródło:
Diagnostyka; 2014, 15, 1; 3-9
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł

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