Numerical study and multi-objective optimization of flexible screening process of flip-flow screen: A DEM-FEM approach

Abstract

Vibrating flip-flow screens are widely used in deep screening processes. However, in-depth studies on flexible screening processes and the optimization of their operating parameters are limited. This study combines the discrete element method (DEM) and finite element method (FEM) to establish a coupled DEM–FEM model for simulating flexible screening processes. The reliability of the model was experimentally verified. Single-factor and central composite experiments were conducted to analyze the effects of y-direction amplitude, relative amplitude, installation angle, and frequency on particle speed, screening efficiency, and sieve plate stress. Finally, multi-objective optimization was implemented. The results revealed the dynamic response of the amplitude and stress on the flexible screen surface under the impact of materials. Moreover, a mathematical fitting model was derived to describe the relationship between the evaluation index and vibration parameters. Accordingly, a foundation for effectively improving the performance and reliability of flexible screening was established.