Meng Wenjun

Terminal Sliding Mode Control for Multi-degree-of-Freedom Robot Based on Genetic Algorithm

According to trajectory tracking of robot, a method of a terminal sliding model controller based on genetic algorithms is presented. By using genetic algorithm to select the optimum parameters of fast terminal sliding mode, the system state variables are guaranteed to reach the sliding mode manifold quickly and stay on it all the time in finite time, and then the trajectory tracking control is realized. A simulation study is made on a two-degree-of-freedom robot system, and the results show that the system has good dynamic performance and good robustness, and the chattering can be effectively eliminated.

Design method of a vertical screw conveyor based on Taylor–Couette–Poiseuille stable helical vortex:

This article investigates gas–solid two-phase flow in a vertical screw conveyor and analyzes the distribution function of the circumferential velocity of particles in the radial direction. Theoretical analysis combined with EDEM+FLUENT simulation analysis is performed to determine the best fill rate, the best screw speed, and critical Reynolds number when Taylor–Couette–Poiseuille flow stable helical vortex forms in the vertical screw conveyor. The formula for the critical Reynolds number and the best throughput is determined under different friction coefficients to establish an efficient design method based on Taylor–Couette–Poiseuille stable helical vortex flow. The method greatly benefits the design of vertical screw conveyors.

Conditions of gas–solid two-phase flow formed in a vertical screw conveyor

This study investigates the velocity and pressure distributions of gas flow field in a vertical screw conveyor through EDEM simulation. Results show that the vertical velocity of gas is the highest and that the minimum pressure is negative, which is at the exit, thereby aiding in the upward transportation of particles. The particle state in the vertical screw conveyor is obtained without considering gas (EDEM simulation) and by considering gas (EDEM + FLUENT simulation), respectively. Investigation of the relationship among the screw critical speed, screw diameter, and particle size shows that the conditions of gas–solid two-phase flow form in the vertical screw conveyor. A test is designed to verify the correctness of the conclusions. The results of this study lay a foundation for the development of design methods based on gas–solid two-phase flow in a vertical screw conveyor.

Feeding head of relative rotary based on EDEM+FLUENT

This article takes an efficient feeding head as the research object to study its work mechanism and perform dynamics analysis of the materials in the feeding head. In addition, this article obtains the physical prototype of a three-dimensional model and the feeding surface equation through the surface data of the feeding head and investigates different unfold lines of the feeding surface. In addition, this article recommends a curve equation of the feeding head under different friction coefficients through EDEM + FLUENT simulation analysis and conducts a research on transport and feeding quantity to deduce the equation for the transport quantity of the feeding head. Finally, the verity of the preceding curve equation and transport quantity is confirmed, which has important guiding significance for the feeding head design.