274 Figure 8-(a)Vector diagram of dusty airflow velocity, (b) vector diagram of dusty airflow field at chute outlet, (c)coal flow velocity trajectory diagram, (d)pressure contour map inside the dust removal device Lightweight Design of Drums Aiming at the problems of heavy weight and low reliability, caused by the design of super large roller by using empirical analogy method, an equal strength optimization method based on fatigue damage theory and genetic algorithm is proposed (Han Y., 2025). Through the joint simulation and optimization of ANSYS and MATLAB(Ansys, 2023; Matlab, 2023), the weight of the drum is reduced by 13%, and its reliability is improved. The finite element calculation results are shown in Figure 9. Figure 9-Fatigue analysis of roller shaft and finite element analysis of cylinder DIGITAL TWIN INTELLIGENT OPERATION AND MAINTENANCE SYSTEM Digital twin technology is widely used in the field of intelligent operation and maintenance of mechanical equipment (Xiao B., 2024; Zhang Y., 2025). In order to realize the transformation of operation and maintenance mode from post fault maintenance to predictive maintenance, an intelligent operation and maintenance system integrating physical entity and virtual model is constructed, as shown in Figure 10(a).
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