STUDY OF THE INTERACTION BETWEEN VIBRATING FORM AND CONCRETE MIXTURE WITH DIFFERENTLY DIRECTED OSCILLATIONS
Journal Title: Вісник Кременчуцького національного університету імені Михайла Остроградського - Year 2017, Vol 1, Issue 107
Abstract
Purpose. To study the interaction of concrete mix with bottom and vertical walls vibrating shapes with differently directed oscillations. The correct account of the forces of resistance of cement concrete mix largely determines the accuracy of the establishment of the law of vibrations of the vibration forms, the choice of her rational parameters and technological parameters of vibration exposure on the treated environment. These resistance forces arise in the vertical, horizontal and torsional (angular) vibrations vibrating forms performed simultaneously, and have different values. Therefore, for justification of rational parameters of vibrating the forms necessary to accurately determine the pattern of deformation generated environment in vertical and horizontal directions, and the deformation of the concrete environment of the side walls of the mold. Methodology. Mathematical model of interaction of concrete mix with bottom vibrating the forms with vertical and horizontal vibrations, vertical wall of the vibration shape at the horizontally directed oscillations. Here the sealing environment is presented in the form of continua with distributed parameters. As a result of solutions to the equations of oscillations of the sealing medium equations, satisfying the given boundary conditions with differently directed oscillations, determined the pattern of deformation of the sealing medium depending on the rise time of the density of the moldable mixture, its physical-mechanical characteristics, the thickness of the sealing layer of the vibrating mass shape, frequency and amplitude of disturbing force. Results. On the basis of oscillation theo-ry to continuum mechanics, studied the process of propagation of waves of deformation in the sealing environment, presented in the form of systems with distributed parameters, and defined the law of deformation of the sealing medium with multidirectional vibrations acting on the bottom of the vibrating shape in the vertical and horizontal directions and the vertical wall of the vibration shape at the horizontally directed oscillations. subjected to horizontally directed vibra-tions from the vertical, closely spaced to each other walls of the vibration shape. The theoretical expression that allows to accurately describe the behavior of a real dynamical system "form of Vibratory – compacted environment" in the molding of concrete products from ready mix concrete by the application of multidirectional vibrations. Originality. The obtained theoretical expressions allow computer simulation of the laws of motion and mode shapes of the sealing layers of the concrete mix, to analyze them from the point of view of effective influence on the processed medium mul-tidirectional vibrations, to justify the shape and form of vibration exposure, and to substantiate the rational parameters of vibrating equipment. Practical value. The proposed method of determining the laws of motion and basic parameters of vibration forms for compaction of concrete mixtures will be widely used in the design of new vibrating machines for compacting concrete mixes.
Authors and Affiliations
А. Maslov, L. Akhmetova
Keywords
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