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| Знайдено в інших БД: | Реферативна база даних (2) |
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Пошуковий запит: (<.>A=Vynohradov B$<.>) | |||
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Загальна кількість знайдених документів : 3 Представлено документи з 1 до 3 |
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| 1. | 
Vynohradov B. V. Limitation of oscillations of vibrating machines during start-up and shutdown [Електронний ресурс] / B. V. Vynohradov, V. I. Samusya, D. L. Kolosov // Науковий вісник Національного гірничого університету. - 2019. - № 1. - С. 69-75. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2019_1_12 Purpose. Development and justification of a method for limiting resonance vibrations during start-up and shutdown of vibrating machines by using cord-reinforced rubber air springs as elastic elements Methodology. Viscoelastic models of two systems are considered; the first includes a rubber-cord air spring filled with compressed air and connected to an additional air volume through an orifice plate; the second system incorporates a rubber-cord air spring filled with liquid and connected to a hydropneumatic accumulator through an orifice plate. For these viscoelastic systems, linearized equivalent dynamic diagrams have been presented and differential equations of motion have been formulated. A method of limiting resonance vibrations during the start-up and shutdown of vibrating machines is considered. The effectiveness of limiting the resonance vibrations and forces transmitted to the fixed support structures is studied using the example of a vibrating screen. The worst case is considered when resonance vibrations are of a steady nature. The amplitude-frequency response and coefficients have been obtained, which characterize the dynamic load transmission to the fixed support structures for various viscous resistance forces determined by the orifice plate parameters. Findings. Equivalent schematic diagrams of viscoelastic systems incorporating rubber-cord air springs and a mathematical model describing the forced vibrations have been developed, a method has been proposed for limiting vibrations and loads transmitted to the fixed support structures during start-up and shutdown of vibrating machines. The effectiveness of the proposed method has been justified. Originality. It has been scientifically justified that the use of rubber-cord air springs as elastic elements of vibrating machines allows effectively limiting resonance vibrations and dynamic loads transmitted to the structures of fixed supports. Practical value. This allows limiting resonance vibration amplitude of a vibrating screen and decreasing dynamic loads transmitted to the fixed support structures of vibrating machines. | ||
| 2. |
Vynohradov B. V. Impact of flexibility of support on gear mesh dynamics [Електронний ресурс] / B. V. Vynohradov, D. O. Fedin, V. V. Ved // Науковий вісник Національного гірничого університету. - 2019. - № 4. - С. 37-41. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2019_4_8 Purpose. Development of a mathematical model of gear mesh which takes into account flexibility of a pinion support for studying the influence of lateral vibrations on gear dynamics as a whole. Methodology. The calculation model is designed using lumped-parameters method. The research on dynamics of the system is performed by methods of the theory of oscillations of two degree of freedom systems. Using the approximate method of theory of oscillations and algebra, vibrational amplitude of the system is defined. The results of numerical integration of dynamic equations are compared to the experimental data. Findings. State-of-the-art review on gear mesh models taking into account coupling effect of pinion torsional and lateral vibrations is performed. Based on the lumped-parameters method, an analytical model for calculating dynamics of gear mesh with flexible support is developed. The amplitude-frequency response of open gearing of a tumbling mill MSHRGU 4500 x 6000 is studies taking into account flexibility of a pinion shaft and bearing parts. It is shown that torsional vibrations of a pinion and lateral vibrations of a power unit have a coupling effect. The models of highly loade gearing give values of natural frequencies with a significant error. A range of possible force resonance in a power unit of tumbling mill open gearing is defined. Causes of excessive vibroactivity of mechanical systems of drives of certain mills and increasing vibroactivity when in operation are established. It is shown that amplification of vibroactivity of a tumbling mill power unit due to intermittent action of forces with gearing frequency is improbable. Rational techniques of reducing vibroactivity of existing mills due to lubrication and increasing hardness of working face of gear teeth are defined. Originality. Methods for defining resonance range of gear mesh which consider a coupling effect of pinion torsional vibrations and pinion shaft lateral vibrations are developed. Practical value. The range of possible force resonance in a power unit of tumbling mill MSHRGU 4500 - 6000 open gearing is defined. | ||
| 3. | 
Vynohradov B. The ways to enhance durability and bearing capacity of the open gear drum mills [Електронний ресурс] / B. Vynohradov, V. Karpenko, O. Lahoshna, K. Bas, I. Slovska // Mining of mineral deposits. - 2021. - Vol. 15, Iss. 3. - С. 87-94. - Режим доступу: http://nbuv.gov.ua/UJRN/rr_2021_15_3_14 | ||
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