Thermal positioning error modeling of machine tools using a bat algorithm-based back propagation neural network

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Abstract

Thermal error of a machine tool is one of the main reasons affecting the machining accuracy. Heat production and heat transfer of a machine tool are too complicated to predict the generated thermal error accurately. According to the nonlinear and time-varying characteristics of thermal error, the back propagation (BP) neural network is perfectly suitable for thermal error modeling, which has been extensively used to map the nonlinear relationship. However, traditional BP neural network usually has poor prediction performance under different operating conditions. Therefore, a new swarm intelligent optimization algorithm, bat algorithm (BA), is introduced to optimize BP neural network and improve its performance. The focus of this paper is the application of the combined algorithm (bat algorithm-based back propagation neural network) to solve the problem of thermal error modeling. Thermal positioning error experiments were conducted on a three-axis experiment bench. The experimental results show that thermal positioning error model built by BA-BP neural network is more stable and has high prediction accuracy and strong robustness, which can provide a candidate method for thermal error modeling.

Keywords

Thermal error modeling Bat algorithm BP neural network CNC machine tools Swarm intelligent optimization algorithm 

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Notes

Acknowledgments

This work is supported by the National Key Basic Research and Development Program (973 Program) of China (grant no. 2011CB706702), Natural Science Foundation of China (grant no. 51135006 and 51305161), Jilin province science and technology development plan item (grant no. 20130101042JC).

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© Springer-Verlag London Ltd., part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Mechanical Science and EngineeringJilin UniversityChangchunChina

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