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.
Highlights
Tunnel Boring Machine (TBM) is a kind of advanced engineering equipment used in various tunnels, which is widely applied to the urban subways, river-crossing or sea-crossing tunnels and national defense tunnel excavation
Sun, Huo et al has been done a lot of research work in the aspects of TBM cutterhead system vibration characteristics, tunneling field test, electromechanical coupling vibration model as well as the structural performance evaluation, and some useful results were achieved, which can provide reference for TBM cutterhead structural anti-vibration design and parameters matching [18,19,20,21]
The natural frequency sensitivity curves change suddenly after point A, and the mode shapes are synthesized into the cutterhead, inner ring gear translational and motors, pinions torsional coupled vibration mode, which indicates that point A is a sensitive point of the cutterhead piece tangential support stiffness parameter
Summary
Tunnel Boring Machine (TBM) is a kind of advanced engineering equipment used in various tunnels, which is widely applied to the urban subways, river-crossing or sea-crossing tunnels and national defense tunnel excavation. Han, Xia et al established a TBM excavation finite element model to investigate the dynamic responses of cutterhead loads, and the simulation results were validated by a tunneling test [15]. Sun, Huo et al has been done a lot of research work in the aspects of TBM cutterhead system vibration characteristics, tunneling field test, electromechanical coupling vibration model as well as the structural performance evaluation, and some useful results were achieved, which can provide reference for TBM cutterhead structural anti-vibration design and parameters matching [18,19,20,21]. Scholars have studied the TBM cutter rock breaking characteristics, cutterhead loads and system vibration by the means of field test, numerical simulation and theoretical derivation, and some instructive conclusions were obtained. A TBM cutterhead of a water tunnel project in northwest Liaoning province is taken as an example, the influence of cutterhead support stiffness and mass parameters on the system natural frequencies and sensitivity is analyzed, to lay foundation for the cutterhead system dynamic design and parameters matching
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