This article mainly studies the stress field distribution of the die-cutting machine under no-load conditions, and uses numerical simulation methods to couple and mesh the main body of the die-cutting machine. By setting boundary and initial conditions, and applying working load on the transmission shaft, the stress field distribution of the main part of the die-cutting machine was numerically simulated using COMSOL software. The results show that the stress in the main body of the die-cutting machine is mainly concentrated on key components such as the transmission shaft, bearings, and gears, and is far below the yield strength of the material. In addition, the four upper swing rods of the die-cutting machine bear significant stress under no-load conditions. By studying the stress field distribution of die-cutting machines, strong support can be provided for the optimization design and fault diagnosis of die-cutting machines, ensuring their safe operation and efficient production.
Competitive cycling is one of the most popular sports in the world. In order to study the correlation between the drag and dynamic pressure field distribution of competitive cyclists at different velocity, the SST k-ω model was used for CFD numerical simulation in this work. The dynamic pressure field around the cyclist's system is analyzed, and the key monitoring points are set up and the dynamic pressure change trend at different velocity and the change trend of the steadystate dynamic pressure difference of the monitoring points are calculated. The results show that the variation trend of the dynamic pressure difference at different velocity is highly consistent with the variation trend of the drag coefficient, indicating that the dynamic pressure difference is an important source of drag.
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