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Wyszukujesz frazę "active reduction of vibration" wg kryterium: Temat

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    Tytuł:
    Active vibration reduction operator’s seat with the use of controlled single-acting pneumatic actuator
    Autorzy:
    Chwastek, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/247371.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    mobile heavy machines
    unsprung vehicles
    active reduction of vibration
    controlled suspension seats
    pneumatic actuator
    Opis:
    Mobile heavy machines produce vibrations with low natural frequencies. Because they tend to ride at low speeds, excitations due to road roughness excite low frequency vibrations, which can be reduced by active or semi active methods only. Under conditions of low frequency vibrations, energy dissipation in tires will reduce the vibration intensity in a minor degree only. In the unsprung mobile machine vibration isolation system are provided between a vibration source and the protected object (operator) along the path of vibration propagation. Most machines are now equipped with controlled suspension seats. In the case of active suspensions, the external energy source is required, for instance in the form of compressed air. The compressed air has the advantage that it is generally available in heavy machines as the working fluid and is environmentally friendly. Simulation tests were carried out both in the time domain in Matlab-Simulink and in the frequency domain in the program Mathcad. Simulation tests were performed to investigate effectiveness and stability of the proposed solution and the results were deemed satisfactory. The system was found to be feasible and implementable with respect to every parameter. The first purpose of this study is to develop a simulation model of the active suspension of operator's seat based on an adjustable pneumatic actuator. The other purpose of this study is to examine the effectiveness of different control strategies.
    Źródło:
    Journal of KONES; 2015, 22, 3; 13-19
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Formulas Obtained for Analytical and LQ Idea Approaches to Determine the Optimal Actuator Location in Active Multimodal Beam Vibration Reduction
    Autorzy:
    Żołopa, E.
    Brański, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/177078.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    beam
    actuator
    active vibration reduction
    LQ problem
    system control
    control of vibration
    Opis:
    In this paper an active multimodal beam vibration reduction via one actuator is considered. The optimal actuator distribution is analyzed with two methods: an exact mathematical principles and the LQ problem idea. It turned out that the same mathematical expressions are derived. Thus, these methods are equivalent.
    Źródło:
    Archives of Acoustics; 2014, 39, 4; 599-603
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model identification of active pneumatic vibration reduction operator’s seat of mobile machines
    Autorzy:
    Chwastek, S.
    Pobędza, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/244627.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    unsprung machines
    active reduction of vibration
    controlled suspension seats
    pneumatic actuator
    Opis:
    Low-frequency vibrations, generated in mobile machines during their driving, could be reduced only by use of active or semiactive methods. In conditions of low-frequency vibrations, energy dissipation in the machines tires slightly reduces the intensity of the vibration. Unsprung mobile machines are usually equipped with system of vibration isolation, which is located on the way of vibration propagation, between the vibration source and the protected object (the operator of the machine). Generally, controlled seat suspension is used. In the case of the active suspensions, it is necessary to provide external energy, e.g., in the form of compressed air. The compressed air has the advantage that it is generally available in working machines as the working fluid and has its environmentally friendly properties (leaks do not contaminate the environment). This article is the result of the continuation of work on active methods of vibro-activity lowering in mobile machines, which resulted in, among others, elaboration of simulation model of the active operator’s seat suspension with controlled pneumatic actuator. Currently aim of the study was experimental verification of the theoretical results; this verification was performed on the laboratory test bench. In the stand tests, special attention was paid on the assumed models of friction and thermodynamic phenomena in pneumatic actuator, as well as on the control system. Experimental tests were carried out under conditions of harmonic excitations, coming from the electromechanical vibration exciter with controllable pitch and frequency. Data acquisition system and control circuit of the proportional directional control valve, supplying compressed air to the actuator were implemented using Matlab-Simulink Real-Time software. Identification of the simulation model allows for getting the right parameters of the seat suspension. In addition, parametric optimization of the seat suspension system and functional optimization of control strategy would be possible in the next step.
    Źródło:
    Journal of KONES; 2016, 23, 4; 55-62
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Opracowanie matematycznych i fizycznych zależności do budowy modelu matematycznego układu wyważania wirników
    Mathematical models of balancing rotors based on mathematical and physical relationships
    Autorzy:
    Rumin, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/395360.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    wyważanie wirników
    redukcja drgań
    aktywne metody wyważania
    dynamika wirników
    rotor balancing
    unbalance
    reduction of vibration
    active methods of balancing
    rotor dynamics
    Opis:
    W referacie omówiono zagadnienia dotyczące powstawania drgań w wirnikach na skutek ich niewyważenia. W celu zaprojektowania układu automatycznego wyważania przy użyciu płynu jako masy korekcyjnej, opracowano model matematyczny wirnika oraz układu wyważającego. Zaproponowany system wyważania wykorzystuje tarcze korekcyjne, które umieszczone są na wale. Każda tarcza korekcyjna ma wewnątrz odpowiednio połączone ze sobą komory wypełniane płynem. Na skutek przepływu płynu (wykorzystywanego jako masa korekcyjna) do poszczególnych komór, następuje wyważenie wirnika i redukcja niepożądanych drgań mechanicznych. Przedstawiono możliwości wykorzystania układu wyważania do istniejących maszyn w przemyśle.
    This paper presents the problem of the rotor vibration due to unbalance. In this research shows the propositions of design of the active balancing system for rotors by using fluid as the correction mass. This system uses a balancing corrective discs, which are placed on the shaft. It has been described a mathematical model of the equivalent correction mass allocation. The rotor-balancing system help to reduction unwanted mechanical vibrations. There are possibilities of using this technology for the existing machines in the industry.
    Źródło:
    Postępy Nauki i Techniki; 2011, 8; 226-232
    2080-4075
    Pojawia się w:
    Postępy Nauki i Techniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semiactive vibration reduction of operator’s seat with the use of controlled magnetorheological damper
    Autorzy:
    Chwastek, S.
    Kozioł, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/241873.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    seats suspensions
    mobile machines
    magnetorheological damper
    semi-active methods
    controlled suspension
    reduction of vibration
    Opis:
    Low speeds of mobile heavy machines makes that the force derived from rough roads cause intense excitation of low frequency vibration, the reduction of which is possible only by active or semi active methods. In conditions of low frequency, the energy dissipation in the tire reduces the vibration intensity in a minor degree only magnetorheological dampers are free from this defect, which they properties changing under influence an electric field functioning on ferromagnetic particles of oil suspension. A controlling coil current, which is mounted in the damper piston, could control density of magnetic field lines (magnetic field intensity) directly in viscous hole of piston, and hence viscous drag force. Electric energy needed to control magnetorheological damper is generally available in each of mobile heavy machines. Simulation tests were performed to investigate effectiveness and stability of the proposed solution and the results were deemed satisfactory. The system was found to be feasible and implementable with respect to every parameter. The purpose of this study was to develop a simulation model of the semi active suspensions of operator’s seat based on magnetorheological damper, and to examine the effectiveness of using different control strategies.
    Źródło:
    Journal of KONES; 2015, 22, 4; 59-66
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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