DOI: 10.52150/2522-9117-2026-40-017
S. S. Havrylenko1,*, Ph. D. Student, ORCID 0000-0003-0432-9623
1 Dnipro University of Technology
* Corresponding author: Havrylenko.St.S@nmu.one
SIMULATION OF THE TRANSIENT PROCESS OF A BALANCED GRIZZLY SCREEN-RELOADER UNDER IMPACT LOADING
Abstract. The paper investigates the dynamic behavior of a balanced grizzly screen-reloader in a transient operating mode caused by the fall of a large piece of material onto the working surface. The relevance of the study is determined by the operating conditions of transfer points in conveyor lines, where impact actions from bulk rock mass are superimposed on the forced oscillations of the working members and may lead to increased amplitudes, angular oscillations and higher loads on the support system. The purpose of the study is to simulate the transient process of a balanced screen-reloader under impact loading and to evaluate the ability of the system to return to a steady forced-oscillation mode after an impulsive disturbance. The mathematical model is based on Lagrange equations of the second kind and takes into account the mass-inertia parameters of the grates, the stiffness and damping characteristics of the elastic supports, and the harmonic excitation generated by the eccentric drive. The impact of the falling material piece is represented as a short-term completely inelastic interaction specified through a change in the initial velocities of the system. Numerical analysis is performed for a 500 kg piece falling from a height of 5 m and having a longitudinal velocity component of 5 m/s. It is established that the initial velocity of the system in the longitudinal direction after impact is approximately 0.654 m/s. In the vertical plane, the falling velocity of the material is 9.90 m/s, while the initial velocity of the middle grate is about 2.29 m/s. The results show that after the impact a damped transient process is formed in the system with superposition of free and forced oscillations. The initial total amplitude of the displacements of the centers of gravity of the grates is 44-46 mm, and after decay of the free component it decreases to steady forced oscillations with an amplitude of about 5 mm. The maximum initial amplitude of angular oscillations does not exceed 0.022 rad and decreases with time to the level of forced oscillations. The obtained results confirm the limited character of a single impact disturbance and may be used for estimating allowable impact loads, selecting parameters of elastic supports and checking the dynamic stability of screen-reloaders.
Key words: screen-reloader, impact loading, transient process, falling material piece, eccentric drive, dynamic stability.
For citation: Havrylenko, S. S.(2026). Simulation of the transient process of a balanced grizzly screen-reloader under impact loading. Fundamental and applied problems of ferrous metallurgy, 40, 261-271. https://doi.org/10.52150/2522-9117-2026-40-017
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Рукопис надійшов до редакції / Received 10.03.2026
Рекомендовано до друку / Accepted 28.05.2026
Опубліковано / Published 30.05.2026
