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Wyszukujesz frazę "antiresonance" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Movement properties of antiresonance vibration mill with symmetrical construction
Autorzy:
Cieplok, Grzegorz
Piekaj, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2146609.pdf
Data publikacji:
2020
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
vibration mill
vibration grinding
antiresonance
młyn wibracyjny
szlifowanie oscylacyjne
antyrezonans
Opis:
Vibration mills used in the industry are an alternative to conventional gravity mills. Compared to gravity mills they have much lower demand for energy of the milling process, significantly lower mass and several times lower cost of raw materials milling. In addition, they have much greater technological possibilities, which justifies their use in many cases. Apart from a number of advantages, vibration mills have disadvantages. The dynamics of work causes a significant transfer of vibrations to the ground and a major load on the vibrator bearings. As a result, they require temperature monitoring and the use of complex cooling systems. It is possible to reduce these negative effects by using new construction solutions.
Źródło:
Vibrations in Physical Systems; 2020, 31, 3; art. no. 2020302
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Piezofilms for Excitation and Active Damping of Blade Flexural Vibration
Autorzy:
Pešek, L.
Půst, L.
Bula, V.
Cibulka, J.
Powiązania:
https://bibliotekanauki.pl/articles/177268.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vibration suppression
parametric antiresonance
active damping
PVDF films
Opis:
The steam turbine blades of low pressure stages are endangerd by the high-cyclic fatigue due to the combined loading of dynamic stresses by the steam time-variant pressure and the pre-stress from centrifugal forces. Therefore, the importance of their experimental dynamic analysis in the design stage is critical. For laboratory tests of the blades, the piezo actuators placed on the blades, unlike electromagnets placed in the stationary space, give a possibility to excite the flexural vibration of the blades within the bladed disk by time continuous forces independently of the rotor revolutions. In addition, the piezo actuators can be also used to control the vibrations of the blade. Therefore, several dynamic experiments of the clamped model blade equipped with PVDF films were performed for the force description of the piezo foils and their behavior as actuators of the blade vibration. The numerical beam models were used for numerical analysis of the vibration suppression effects both by additional parametric excitation and by active damping. The optimal phase shift of piezo actuator voltage supply was ascertained both for amplitude amplification and suppression. The results contribute to the knowledge of the actuation and active damping of blade vibration by the piezo elements.
Źródło:
Archives of Acoustics; 2015, 40, 1; 59-69
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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