Dynamic analysis of a dashpots equipped vibrating screen using finite element method

Abstract

Even though vibrating screens have been used in mining industries for over a century, their use has often been cited as challenging in terms of understanding its dynamic responses to different operating factors, particularly those that affect the structural aspects. Among the various aspects of screen design, the control of vibrational energies imposed on various parts of the screen is of particular importance because these vibrations directly affect the separation efficiency and useful life of the screen. This study proposes the use of vibration absorbers to control the adverse effects of severe screen vibrations. The dynamic behavior of a medium-sized vibrating screen utilized in the aggregate industry was investigated using the finite element method for both spring/dashpots and conventional solely spring systems. The modeling process was performed in loaded and unloaded conditions and in three frequencies of 15, 23, and 27 rad/s. Numerical simulation results showed that the use of dashpots can significantly reduce the maximum stress in the screen, such that the maximum stress in the center of gravity of the screen at the optimal frequency of 23 decreased from 237 to about 97 MPa. Also, sieve modal analysis showed that the stress in the sieve equipped with the spring/dashpots system had a more uniform distribution. The results revealed that the use of vibration absorbers can be a promising solution to prevent damage caused by high vibrational energies in screens.

Evaluation of the Effects of Coal Jigging by Means of Kruskal–Wallis and Friedman Tests

“…Classical statistical methods were used in this respect [26], as well as "black box" methods based on neural networks [27]. The application of coupled fuzzy logic and experimental design can be found in [28]. Modeling of the influence of mechanical parameters of the device on the hydrodynamic behavior has been presented in [29].…”

Dynamics of a vibratory screening conveyor equipped with a controllable centrifugal exciter

“…A thorough comparative analysis of two vibratory screens with single-mass and double-mass oscillatory systems is presented in [1]. The problems of studying the loading characteristics and verifying the reliability parameters of vibratory screening and conveying machines are comprehensively studied in numerous scientific publications, particularly in [2,3]. Another field of investigations, e.g.…”

Adaptive Control of Advanced G-L Fuzzy Systems with Several Uncertain Terms in Membership-Matrices

“…The concept of fuzzy logic was proposed by L. A. Zadeh in 1965 [1] that has received much attention as a powerful tool for interdisciplinary applications, such as clustering [2,3], fault diagnosis [4][5][6], prediction [7,8] and decision making [9][10][11][12], etc. For example, Khoshdast et al [3] presented an approach to reduce the mesh-induced error for CFD analysis; Krzywanski et al [9] applied a set of fuzzy logic-based methods to raise the performance of heat transfer in a super-heater for an industrial CFBC; Khoshdast et al [10] developed a coupled fuzzy logic design for the simulation of a coal classifier in an industrial environment; and in [11], Akbar et al proposed a fuzzy logic-based model to elucidate the effect of FSW parameters on the ultimate tensile strength and elongation of pure copper joints.…”