Natural frequency sensitivity and influence analysis of TBM cutterhead system

Jingxiu Ling1 , Xin Tong2 , Changsheng Guo3 , Zhanfu Li4

1, 2, 4School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou, China

1, 3CSCEC Strait Construction and Development Co., Ltd, Fuzhou, China

4Mechanical Engineering Practice Training Base, Fujian University of Technology, Fuzhou, China

1Corresponding author

Journal of Vibroengineering, Vol. 21, Issue 6, 2019, p. 1710-1723. https://doi.org/10.21595/jve.2019.20427
Received 29 November 2018; received in revised form 11 March 2019; accepted 14 April 2019; published 30 September 2019

Copyright © 2019 Jingxiu Ling, et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Abstract.

TBM cutterhead works in complex working conditions, which endures the reverse impact forces of rock breakage, resulting in parts abnormal failure. Hence, the study of the system inherent characteristics is the basis for cutterhead dynamic design. Based on the established vibration model of a TBM split-cutterhead system, the modal method is used in the dynamic model and the natural frequency sensitivity expressions to system parameters are deduced. Then a cutterhead system of a water conservancy project in China is taking as an example, the natural frequency sensitivity with respect to the cutterhead support stiffness and mass parameters is obtained, and the influence of the two parameters on natural characteristics is analyzed. The results show that, the 10th-20th order natural frequencies are mainly affected by the cutterhead support stiffness and mass parameters, and the 9th-11th order frequencies are mainly influenced by cutterhead moment of inertia. Besides, with the change of stiffness and mass parameters, the cutterhead system natural frequency curves cut across each other and there are also many inflection points in the sensitivity curves, then the modal jumping occurs near these points. The parameter sensitive points were obtained from the results, which can provide reference for TBM cutterhead system parameters matching.

Natural frequency sensitivity and influence analysis of TBM cutterhead system

Highlights
  • Natural frequency sensitivity expressions to a TBM cutterhead system are deduced based on modal method.
  • The influence of the stiffness and mass parameters on natural characteristics is analyzed.
  • Many parameter sensitive points are obtained from the results to provide reference for parameters matching.

Keywords: TBM cutterhead, vibration characteristics, parameter sensitivity, mode jumping.

Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (51775113), the Natural Science Foundation of Fujian Province, China (2017J01675), Science and Technology Plan (Guidance) of Fujian Province, China (2017H0002), and Scientific Research Foundation of Fujian University of Technology (GY-Z160048).

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