The finite element model of the tooth meshing ensures a complete indentation process for the tooth
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Because the existing CAD software and AYSYS are not fully compatible with the processing of complex surface models, the helical gear tooth surface is a free-form surface. To ensure the accuracy of the model, the solid modeling is performed in ANSYS according to the method. Due to the large amount of calculations in transient dynamics analysis, the computer performance is high, and the gear meshing is cyclical. In order to effectively improve the calculation efficiency under the premise of ensuring accuracy, the following three measures are adopted when establishing the finite element model: The secondary coincidence degree establishes the finite element model of the pair-to-tooth engagement, ensuring that a pair of teeth can achieve a complete engagement and engagement process; 2 because the main analysis of the gear teeth is forced, the hub is simplified into a hollow cylinder, and the inner ring is rigid; 3 The finite element mesh is divided by the partition mapping, the density of the tooth surface contact area is large, and the density of the hub portion is small.
Accurate determination of the most disgusting position of the roots The root bending fatigue analysis is based on the calculation of the damage coefficient of the most sinister meshing position. Before the analysis, the most abrupt meshing position of the polystyrene mold root is determined. The transient dynamics method in finite element analysis is used to determine the dangerous position of the tooth root during the meshing process. According to the transient dynamics analysis method, a contact pair is established between the gear pair meshing tooth faces, and the inner surfaces of the driving wheel and the driven wheel are rigidly coupled to concentrate the respective rotating units of the gears at the center of the gear. Therefore, the MPC multi-point constraint technique can be used in ANSYS to simulate gear rotation. According to the motion characteristics of the gear transmission, the driving wheel is applied with a rotational speed, and the driven wheel applies a torque. In order to make the analysis result reliable and effective, the set time load step must consider the rotation speed of the gear and the coincidence degree of the gear pair to ensure that at least one pair of gear teeth of the gear pair undergo a complete engagement and engagement cycle.