Verifikace a validace DEM modelů sypkých hmot v aplikaci na korečkové elevátory a možnosti řešení reálné aplikace v praxi

Abstract

The thesis deals with the innovative design and optimization of bucket elevators and their transport processes. The first part of the thesis is focused on a basic description of bucket elevators and the issue of filling and emptying of these devices with basic computing formulas. This part of the thesis also describes the current method of the design of these devices with 3D programs and an improved method of the design and optimization using the DEM method. The main part of the thesis deals with the optimization of filling and emptying of the bucket elevators using the method of discrete elements. The first step involves the measuring of the mechanical and physical properties of the selected materials which are used as input of the simulation method. Then a 3D model of the bucket elevator as an environment for the simulation is designed and the relevant movements, speed and geometry are programmed from which the incoming transported material is generated. The application and accuracy of the calculated simulation results are necessary to verify with real results. Therefore, the thesis continues with the validation of the dynamic flow of the particulate material on the innovated and patented validation bucket elevator. After the verification of the simulation output in the head of the device, the simulations are also calculated in the base of the bucket elevator. All these results are used for the optimization of the validation machines. The thesis continues to describe the new method to optimize the bucket elevator, which will be used for the transport of abrasives in industry. The optimization of the input and output is provided for this device. Based on these results the modifications for the design are proposed to increase the efficiency of this device. In the conclusion of this thesis optimization results are evaluated and the improvements for this innovative method are described.