Ali Davoodi

DEM Modelling of Vibratory Screens

Ali Davoodi, Product Development IMS, sucessfully defended his doctoral thesis on March 19.  Ali is part of the Chalmers Rock Processing Research (CRPR)​ group. The research  is fokused on machines and systems for the production of crushed rock materials. Applications can be found within the mining and mineral industry and the aggregate production. CRPR is internationally acknowledged within modelling of performance and wear in cone crushers, modelling of screens and optimization of crushing plants facilities.
Popular science summary
What is trending today? Of course, it is sustainability in society concerning the resources we consume as humans. One such resource is aggregates and minerals products, which is the foundation of infrastructure development. Looking at the statistics, the consumption of aggregates in Sweden is about 100 million tons every year, consisting of approximately 90% crushed rock.

To produce aggregates, the rock material needs to be crushed and screened in different stages, which are often high energy-consuming processes. One way to minimize energy consumption is to improve production efficiency. This can be done by analyzing data from the operation and using different simulation platforms to improve equipment utilization.
One of the main classification processes applied in the industry is screening with vibratory screens. A vibratory screen’s main functionality is particle separation, which is a function of gravity, the properties of the granular material, equipment geometry, and the screen’s relative motion. Discrete Element Method (DEM) has been used to study particle behaviour and it is a suitable tool for studying the screening performance. The particle-to-particle and particle-to-geometry interaction can be studied using DEM in a way that is impossible to achieve with physical experiments.
By using DEM simulation, the fundamental understanding of how to improve screening efficiency can be expanded. The advantage of using simulations instead of experiments to improve screening performance is minimizing cost and energy consumption which is one step toward sustainability. Another advantage is that DEM simulations provide practical feedback when designing the vibratory screen. This allows the designer to determine the correctness and efficiency of a design before the screen is constructed.

Public defence
2021-03-19 09:00 -- 12:00
Examiner: Magnus Evertsson, IMS
Opponent: Peter Radziszewski, McGill University

Page manager Published: Thu 25 Mar 2021.