Optimization of mesh characteristics of gear pair considering influence of assembly errors

Abstract

Gear assembly errors can lead to the increase of vibration and noise of the system, which affect the stability of system. The influence can be compensated by tooth modification. Firstly, an improved three-dimensional loaded tooth contact analysis (3D-LTCA) method which can consider tooth modification and coupling assembly errors is proposed, and mesh stiffness calculated by proposed method is verified by MASTA software. Secondly, based on neural network, the surrogate model (SM) that maps the relationship between modification parameters and mesh mechanical parameters is established, and its accuracy is verified. Finally, SM is introduced to establish an optimization model with the target of minimizing mesh stiffness variations and obtaining more even load distribution on mesh surface. The results show that even considering training time, the efficiency of gear pair optimization by surrogate model is still much higher than that by LTCA method. After optimization, the mesh stiffness fluctuation of gear pair with coupling assembly error is reduced by 34.10%, and difference in average contact stresses between left and right regions of the mesh surface is reduced by 62.84%.

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