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Experimental research of oscillation parameters of vibrating-rotor crusher

Honcharuk Inna, Kupchuk Ihor, Solona Olena, Tokarchuk Oleksiy, Telekalo Natalia

Przegląd Elektrotechniczny

2021

R. 97, nr 3

97--100

In article experimental model and specifications Vibrating-Rotor Crusher for grinding feed grain are present. Crusher implements the idea of the combined interaction of vibration and rotational motion of executive bodies, which can significantly increase the power to influence material. To determine the range of the operating parameters of the machine was carried out experimental studies of the amplitude-frequency characteristics of the developed machine depending on the angular velocity of the drive shaft.

Przedstawiono model i badania rozdrabniacza z wibrującym wirnikiem do ziaren paszy. Rozdrabniacz łączy wibrowanie I obracanie co znacząco poprawia jakość pracy. Badano zależność częstotliwości I amplitudy od prędkości kątowej.

Generation of pressure oscillations in air flows in vertical channels with internal heat release

Basok Boris, Davydenko Boris, Pavlenko Anatoliy

Journal of New Technologies in Environmental Science

2021

Vol. 5, nr 3

106--116

The characteristics of the air flow in a vertical channel, arising due to local internal heat release, are investigated by the method of numerical simulation. Heat is supplied to the flow from internal sources located in a limited volume closer to the inlet section of the channel. The problem of flow and heat transfer is described by a system of unsteady Navier-Stokes and energy equations for a compressible medium. The coefficients of viscosity and thermal conductivity are considered to be temperature dependent. From the numerical solution of this system, the velocity, pressure, and temperature fields in the channel are determined. Based on the results of the calculations, the regularities of the change in time of velocity and pressure in the channel are determined. From the analysis of the results it follows that from the moment the heat supply begins, a vertical air flow develops in the channel, which is accompanied by oscillations in velocity and pressure. Self-oscillations arising in a gas flow are a manifestation of instability of flow. It is shown that stable oscillations take place in the presence of additional local hydraulic resistance in the channel. The dependence of the amplitude and frequency of pressure oscillations and the air flow velocity on the power of the sources of internal heat release and the height of the channel has been investigated. It was determined that with an increase in the power of the source of internal heat supply and the height of the channel, the amplitudes of the velocity and pressure fluctuations increase.

Determination of young’s dynamic modulus of polymer materials by resonance vibrating-reed method

Mashchenko Volodymyr, Krivtsov Valentine, Kvasnikov Volodymyr, Drevetskiy Volodymyr

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

2019

T. 9, nr 4

34--37

The paper deals with its own oscillations of a rectangular rod with a cross section of a rectangular shape. The method of determining real part of Young's dynamic modulus and tangent of mechanical loss of samples in the form of rods of a number of polymer materials by means of resonant vibrating-reed method are proposed. Experimental setup, algorithm and software for determining the amplitude of the sample oscillations are developed. The accuracy of measurements was determined and a comparative analysis of results was performed with data obtained by other methods.

W pracy opisano wahania własne prostokątnego sworznia o przekroju prostokątnym. Zaproponowano metodę wyznaczenia za pomocą metody rezonansowej wibracyjnej rzeczywistej części dynamicznego modułu Younga i tangensa kąta mechanicznych strat wzorców w postaci sworzniów z szeregu materiałów polimerowych. Opracowano eksperyment, algorytm i oprogramowanie dla określenia amplitudy wahań wzorca. Określono precyzję pomiarów i przeprowadzono porównawczą analizę wyników z rezultatami otrzymanymi innymi metodami pomiarów.