Dynamics of the system «vibration installation – concrete layer – impulse surcharge device» with account of the effect of the main vibration exciter and higher harmonics

Abstract

The article examines the dynamics of the system “vibration installation – concrete layer – impulse surcharge device,” taking into account the effect of the main vibration exciter and higher harmonics of the oscillatory process. The relevance of the study is обусловлена? Need translate fully, avoid russian accidental. Continue properly. The relevance of the study is determined by the need to improve the efficiency of vibration compaction of concrete mixtures, especially under conditions of nonuniform transfer of vibration energy into the material thickness and the influence of wave processes on the formation of zones of intensified and weakened dynamic action. The aim of the work is to develop a generalized mathematical model of the system that takes into account the interaction of the moving frame with the mould, the concrete mixture, and the impulse surcharge device, as well as to substantiate the conditions for an effective recompaction mode. The study employs methods of analytical modeling of dynamic processes based on the formulation of the equations of motion of the subsystems, taking into account the nonlinear elastic-dissipative response of the concrete mixture, the contact interaction with the surcharge device, and the polyharmonic representation of excitation. Analytical relationships were obtained for describing the contact and non-contact phases of the surcharge device motion, estimating the contact duration, the velocity restitution coefficient, and the conditions for the existence of a steady periodic regime. The practical significance of the obtained results lies in the possibility of using the proposed model to select the parameters of the impulse surcharge device, assess the stability of operating modes, and improve vibration installations for forming concrete products.