Performance optimization of banana vibrating screens based on PSO-SVR under DEM simulations

Abstract

This paper carried out the numerical simulation about the movement of non-spherical particles on banana vibrating screen using direct element method (DEM) considering the complexity of particle collision and avoiding obtaining motion information with difficulty. Experimental prototype of banana vibrating screen under variable parameters was manufactured to verify the feasibility of simulations. Because the complex non-linear mathematical model is the basis of optimization. Based on the simulation data this paper applied the least squares support vector machines (LS-SVM) to establish relationships between vibrating parameters of banana screen and screening performance. LS-SVM based on statistical theory can effectively solve the mapping problem of small sample. At same time, in order to improving the quality of modeling, the kernel parameters of SVM were optimized by particle swarm optimization (PSO). Considering multi-extremum, large-scale, and non-differentiable of this computational model, the artificial fish-swarm algorithm (AFSA) with strong robustness and global convergence was applied to vibration parameters optimization. Finally, the optimal vibration parameters were: vibration amplitude 2.4 mm, vibration frequency 21 Hz, vibration direction angle 40 degrees.

Diagnostics of Bolted Joints in Vibrating Screens Based on a Multi-Body Dynamical Model

“…At the design stage, by using the discrete and finite element approach [12][13][14][15][16][17][18][19], the natural modes of the screen are examined to confirm minimal structural stresses and required trajectories of bulk material motion. Nonetheless, these approaches need significant computing resources in optimization and research.…”

Particle Behavior and Aperture Optimization of Variable Vibration-Amplitude Screening Based on Discrete Element Method Simulation

“…Separation of particulate materials is commonly encountered in mineral processing. The classification of particle mixtures according to particle sizes is always a crucial procedure for subsequent processes. – Screening, or sieving, is the basic technology for the size classification of granular ores. – So far, various kinds of screening equipment have been invented for the grading of different granular materials. – In order to achieve uniform particle mass distribution on the screening equipment, which would yield better sieving performance at all screen panels and hence improve the overall efficiency, the concept of equal thickness screening was proposed. – This has been realized through two kinds of methods. One is to use variable inclination angles of the screen panels, such as the banana screens and sieve bends, , and the other is to use multiaxial excitation of screen panels with variable amplitudes, which has the advantages of low participating mass of the screen body but high throwing intensity .…”