A Review of Thermal Error Modeling Methods for Machine Tools
Abstract
:1. Introduction
2. Thermal Error Modeling Method for Machine Tools
2.1. Least Square Method (LS)
2.2. Multivariable Regression Analysis (MRA)
2.3. Grey System
2.4. Neural Network (NN)
2.5. Support Vector Machine (SVM)
2.6. Hybrid Model
2.7. Other Modeling Methods
3. Discussion
4. Conclusions
- (1)
- On the premise of ensuring the prediction accuracy, the robustness of the thermal error model needs to be further improved. The established thermal error model under the same machine tool, specific working conditions, and environment has high accuracy. However, when the external environment, working conditions, instrument measurement accuracy, and other factors change, the prediction accuracy of the thermal error model will begin to deteriorate.
- (2)
- The current research on the thermal error of machine tools, from the selection of temperature measurement points, the establishment of the model, to the actual application of the compensation model, was all carried out on the same type of machine tool. However, when the model was transferred to other types of machine tools, the accuracy of the model was greatly compromised, or even completely invalid. Future research should consider whether the thermal error model can be successfully applied to different machine tools.
- (3)
- Besides the error compensation method, there is also the error prevention method to reduce the thermal error of machine tool. Considering that both of them have their own advantages and disadvantages in practical applications, how to combine the two reasonably to complement each other should become the content of future scholars’ in-depth thinking and research.
- (4)
- The hybrid forecasting model is established based on two different mathematical modeling methods. By adjusting the weights of two methods, its performance can be improved. Compared with the single model, the hybrid forecasting model has a more comprehensive and stable error prediction performance for the machine tool. Under complex working conditions, it still has higher prediction accuracy. However, there are few studies on hybrid forecasting models, and the types of mathematical principles used in the hybrid model are limited to only two. In the future, a thermal error hybrid forecasting model based on three or more mathematical modeling methods may achieve unexpected performance.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Acknowledgments
Conflicts of Interest
References
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Modeling Method | Advantages | Disadvantages | References | |
---|---|---|---|---|
LS | Mature theory. Simple model structure. Widely used. | Less independent variables. Low predictive ability under complex conditions. | [18,19,20,21] | |
MRA | Simple model structure. Reliable in performance. | Calculation time is too long with more variables. Temperature variable coupling. | [22,23,24,25,26,27,28,29,30,31,32,33,34,35] | |
Grey system | Simpler modeling. Do not rely on massive and complete data information. | When changing the input, the model will be very different. | [36,37,38,39,40,41,42] | |
NN | BP | High prediction accuracy. | Slow convergence speed. Easy to fall into a local minimum The initial value is very difficult to determine. | [47,48,49,50,51,52,53,54,55,56] |
RBF | Simple structure design. Faster training speed. | The key feature functions are more difficult to extract. Worse generalization performance. | [57,58,59,60,61,62] | |
SVM | Strong nonlinear function fitting ability. The best theory for small sample statistics and predictive learning. | Not easy to select parameters. A lot of computing resources. slow convergence speed. | [75,76,77,78,79,80,81,82,83] | |
Hybrid model | Combine the advantages of the separated two modeling methods.Good versatility. High accuracy. Strong robustness. | Increase the difficulty of modeling. | [84,85,86,87,88,89,90] |
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Li, Y.; Yu, M.; Bai, Y.; Hou, Z.; Wu, W. A Review of Thermal Error Modeling Methods for Machine Tools. Appl. Sci. 2021, 11, 5216. https://doi.org/10.3390/app11115216
Li Y, Yu M, Bai Y, Hou Z, Wu W. A Review of Thermal Error Modeling Methods for Machine Tools. Applied Sciences. 2021; 11(11):5216. https://doi.org/10.3390/app11115216
Chicago/Turabian StyleLi, Yang, Maolin Yu, Yinming Bai, Zhaoyang Hou, and Wenwu Wu. 2021. "A Review of Thermal Error Modeling Methods for Machine Tools" Applied Sciences 11, no. 11: 5216. https://doi.org/10.3390/app11115216