RESEARCH OF FLUCTUATIONS OF THE VIBRATION PLATE SELF-PROPELLED THE VIBROCONDENSING MACHINES IN THE OPERATING MODE
Journal Title: Вісник Кременчуцького національного університету імені Михайла Остроградського - Year 2018, Vol 1, Issue 109
Abstract
Purpose. To study the process of oscillations of the vibrating plate self-propelled machine in operation, providing an effective seal ready mix concrete of different consistencies with high performance. Methodology. On the basis of the analysis of existing methods of compaction and the constructive device of compacting means, a new design of a vibration plate with two synchronously rotating vibration exciters with different amplitudes of disturbing forces is proposed. The principle of operation is described. The mathematical model of the dynamic system "Vibrational plate – compacted medium", in which the latter is represented as a discrete-continuum system with continuously changing parameters, is composed. In the process of work, the vibrating plate interacts with the concrete mixture, the properties of which are represented by average stiffness coefficients that characterize the elastic properties of the concrete mixture, respectively, when interacting with the front and rear parts of the bottom of the vibrating plate, and the bottom is conditionally divided into the front and rear parts relative to its middle. Dissipative properties of the concrete mix under the front and rear of the vibration plate bottom in the vertical direction are represented by inelastic drag coefficients. Using the method of numerical integration, the values of the mean stiffness coefficients, the dynamic modulus of elastic deformation, the dynamic viscosity coefficient and the density of the concrete mixture under the front and back of the bottom of the vibratory plate were determined. The studies of the considered dynamic system in working mode are carried out. The equations of motion describing the complex spatial oscillations of the vibration plate of the self-propelled vibrating compacting machine in the form of simultaneously acting vertical, horizontal and angular (torsional) vibrations. Results. The laws of vibrations of the center of gravity of the vibratory plate in vertical and horizontal directions, as well as the laws of vibrations of torsional vibrations relative to the center of gravity of the vibratory plate in its interaction with the compacted medium. The laws of motion of the vibration plate bottom interacting with the concrete mixture in the vertical direction and horizontal plane, depending on the physical and mechanical characteristics of the compacted medium, the thickness of the compacted layer, the angular frequency of oscillations, the geometric parameters of the vibration plate and the elastic suspension of the vibration plate to the base machine. The analysis of the obtained solutions is given. Originality. Theoretical expressions to accurately describe the behavior of the real dynamic system "vibration machine - compacted medium" in the molding of concrete products, both plastic and solid concrete mixtures, by applying spatial oscillations in the form of vertical, horizontal and torsional vibrations. Practical value. The obtained analytical dependences allow substantiate the rational parameters of the self-propelled vibrating machine, choose a rational method of vibration impact on the compacted medium and the appropriate mode of operation depending on the consistency of the concrete mixture and the thickness of the compacted layer. References 10, tables 0, figures 1.
Authors and Affiliations
А. Maslov, I. Zhovtyak
Keywords
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