Limitation of oscillations of vibrating machines during start-up and shutdown

Vynohradov, V.B.; Samusya, Volodymyr Illich; Kolosov, Dmytro

doi:10.29202/nvngu/2019-1/6

Cited by 4 publications

(4 citation statements)

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“…Continuous improvement of technical systems in the fields of mining technologies [1][2][3][4][5][6][7][8][9], transportation and hoisting [10][11][12], deep-sea mining [13,14], and dynamics of technical systems [15][16][17][18][19] facilitate wider and more thorough development of analytical and computational simulation methods of processes and phenomena occurring within the systems. Currently, researchers in many countries are conducting complex scientific studies aimed at developing methods and means of modernizing lifting and transporting complexes with the aim of increasing operational efficiency and safety of mining transport equipment.…”

Section: Introductionmentioning

confidence: 99%

Stress state modelling for composite tractive element with breakages of cable reinforcement and change in mechanical properties of elastomer shell

Belmas,

Kolosov,

Onyshchenko

et al. 2024

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The purpose of research is determination of a dependency of a stress state for composite elastomer-cable tractive element with a broken structure on a nonlinear dependency of shear modulus on deformations in the elastomeric shell. Research methodology is in analytical solution of a model of a composite tractive element with disturbed structure and a deformation-dependent shear modulus of an elastomeric shell. Results are in constructing an algorithm for determining a stress state of a composite tractive element with broken structure and a deformation-dependent shear modulus. Scientific novelty is in determining a character of de-pendency for a stress state of a composite tractive element on a nonlinear dependen-cy of shear modulus on deformations. Practical application of research is in a possi-bility to determine the dependency of a stress state of a composite elastomer-cable tractive element on a nonlinear shear modulus allows considering the effect of this phenomenon on the tractive element strength and ensures an increase of its operation-al safety.

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Section: Introductionmentioning

confidence: 99%

Stress state modelling for composite tractive element with breakages of cable reinforcement and change in mechanical properties of elastomer shell

Belmas,

Kolosov,

Onyshchenko

et al. 2024

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“…It is known that it has not been possible to establish regular, accurate analytical methods for solving systems of differential equations in a general form until the present day. Therefore, approximate, numerical methods for solving these problems are being developed, which are adapted to computer technology [25][26][27]. Thus, mathematical modelling is reduced to a computational experiment, performed according to a constructed mathematical model of the problem, while using the developed numerical methods.…”

Section: Introductionmentioning

confidence: 99%

Analytical modelling and design of linear controlled dynamic systems

Kravets,

Kolosov,

Kravets

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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A generalized canonical mathematical model of multidimensional controlled mining transportation complexes and other technical systems in form by A.M. Letov is considered. A principle of symmetry and an algebraic concept are in the basis of the developed analytical methods of design. A principle of symmetry is realized on a set of indexes of roots of a characteristic equation of the system and on a set of indexes of phase coordinates of the mathematical model. The problem of quality of dynamic processes in time is reduced to an algebraic problem of distribution of roots of a corresponding characteristic equation in a complex plane. An analogy in a procedure of transformation of a characteristic determinant into a polynomial and a structure of elementary symmetrical polynomials of roots is established. A new formulation of an analytical representation of change of phase coordinates in time in a form of ordered determinants with respect to indexes of roots and indexes of phase coordinates is obtained based on residue theorem. An illustration of the developed analytical method of design is performed on a special case of a well-known controlled technical system of the fourth order.

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“…These combine both particle grinding and simultaneous screening of the finished product. Complication of the machine design, including due to the use of the vibration field of forces, leads to a corresponding complication of the models describing its operation, as well as transient modes [5]. The study is devoted to the treatment of various rocks in the machine described in detail in work [6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of rock grinding results in centrifugal-vibrational disintegrating module

Shevchenko,

Greshta,

Tytov

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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This scientific study is devoted to analysis of the results of grinding materials such as marble, sandstone and granite in a disintegrating module. This module combines grinding of particles in the countercurrent centrifugal mill with simultaneous vibrational screening of the finished product. The essence of the study is that two-factor experiments have been carried out according to the full factor scheme. Here, the achieved degree of crushing is used as the response function. The valuable factors have the initial size and the ultimate strength of the material. As a result of two-factor analysis of variance, it has been found that the compressive strength and the initial size of the material, regardless of the sieve vibration amplitude, have a significant and comparable scale effect on the material crushing ratio. At the same time, the interaction of factors has no statistical significance. Also, approximation of experimental data by the first- and the second-order regression equations has been performed. For simplified calculations, it is recommended to use the linear regression equation, while for more accurate ones, the second-order equation is more suitable.

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Limitation of oscillations of vibrating machines during start-up and shutdown

Cited by 4 publications

References 0 publications

Stress state modelling for composite tractive element with breakages of cable reinforcement and change in mechanical properties of elastomer shell

Stress state modelling for composite tractive element with breakages of cable reinforcement and change in mechanical properties of elastomer shell

Analytical modelling and design of linear controlled dynamic systems

Analysis of rock grinding results in centrifugal-vibrational disintegrating module

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