1. Statistical tolerance allocation design considering form errors based on rigid assembly simulation and deep Q-network.
- Author
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He, Ci, Zhang, Shuyou, Qiu, Lemiao, Wang, Zili, Wang, Yang, and Liu, Xiaojian
- Subjects
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MACHINING , *REWARD (Psychology) , *MONTE Carlo method , *PARTICLE swarm optimization , *JACOBIAN matrices , *MECHANICAL models , *ASSIGNMENT problems (Programming) - Abstract
Consideration of form errors involves real machining features in tolerance modeling but increases uncertainties in functional requirement estimation, when tackling the trade-off between the cost and precision performance. In this paper, a statistical tolerance allocation method is presented to solve this problem. First of all, a top-down stepwise designing procedure is designed for complex products, and a combination of Jacobian matrix and Skin Model Shapes is applied in modeling the mechanical joints. Then, rigid assembly simulations of point-based surfaces are further advanced to provide an accurate estimation of the assembly state, through considering physical constraints and termination conditions. A mini-batch gradient descent method and a backtracking strategy are also proposed to promote computational efficiency. Finally, a deep Q-network is implemented in optimal computation after characterizing the systematic state, action domain, and reward function. The general tolerance scheme is then achieved using the trained Q-network. The results of 6 experiments each with 200 samples show the proposed method is capable of assessing tolerance schemes with 35.2% and 47.2% lower manufacturing costs and 16.7% and 28.3% higher precision maintenance on average than conventional particle swarm optimization and Monte Carlo method respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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