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Appl. Sci. 2017, 7(1), 82; doi:10.3390/app7010082

A Temperature Sensor Clustering Method for Thermal Error Modeling of Heavy Milling Machine Tools

1
Institute of Manufacturing Engineering, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
2
Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipment and Control, Tsinghua University, Beijing 100084, China
3
School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Academic Editor: Kuang-Chao Fan
Received: 14 November 2016 / Revised: 27 December 2016 / Accepted: 10 January 2017 / Published: 16 January 2017
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Abstract

A clustering method is an effective way to select the proper temperature sensor location for thermal error modeling of machine tools. In this paper, a new temperature sensor clustering method is proposed. By analyzing the characteristics of the temperature of the sensors in a heavy floor-type milling machine tool, an indicator involving both the Euclidean distance and the correlation coefficient was proposed to reflect the differences between temperature sensors, and the indicator was expressed by a distance matrix to be used for hierarchical clustering. Then, the weight coefficient in the distance matrix and the number of the clusters (groups) were optimized by a genetic algorithm (GA), and the fitness function of the GA was also rebuilt by establishing the thermal error model at one rotation speed, then deriving its accuracy at two different rotation speeds with a temperature disturbance. Thus, the parameters for clustering, as well as the final selection of the temperature sensors, were derived. Finally, the method proposed in this paper was verified on a machine tool. According to the selected temperature sensors, a thermal error model of the machine tool was established and used to predict the thermal error. The results indicate that the selected temperature sensors can accurately predict thermal error at different rotation speeds, and the proposed temperature sensor clustering method for sensor selection is expected to be used for the thermal error modeling for other machine tools. View Full-Text
Keywords: thermal error; temperature sensor selection; clustering method; genetic algorithm; machine tools thermal error; temperature sensor selection; clustering method; genetic algorithm; machine tools
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Li, F.; Li, T.; Wang, H.; Jiang, Y. A Temperature Sensor Clustering Method for Thermal Error Modeling of Heavy Milling Machine Tools. Appl. Sci. 2017, 7, 82.

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