Analyses of dynamic characteristics and structure optimization of tunnel boring machine cutter system with multi-joint surface

Published on Jan 1, 2017in Nonlinear Dynamics5.022
路 DOI :10.1007/S11071-016-3038-0
Junzhou Huo12
Estimated H-index: 12
(DUT: Dalian University of Technology),
Nan Hou2
Estimated H-index: 2
(DUT: Dalian University of Technology)
+ 2 AuthorsJianghui Dong17
Estimated H-index: 17
(UniSA: University of South Australia)
Sources
Abstract
There will be structural failure in the cutter system with different degrees due to the vibration of cutters. Moreover, in the extreme environment, the dynamics behavior of the cutter system is hard to predict, and it is difficult to realize the anti-vibration design of cutters. Therefore, it is of great theoretical value and engineering significance to analyze the dynamics characteristics of tunnel boring machine (TBM) cutter system, optimize cutter structure, and improve the anti-vibration capability. In this paper, the typical TBM cutter systems are studied, based on the lumped mass method, a multi-degree of freedom coupling dynamics model of the TBM cutter system with multi-joint surface is established. Then, the model is verified by the cutter mount vibration experiment, and it is proved that the joint surfaces have a great influence on the vibration performance of cutter system. Finally, the vibration responses and loading transfer law of the cutter are analyzed, and a cutter structural optimization scheme is proposed. The optimization results show that the vibration and loading fluctuation of the upper and lower wedge block cutter mount are relatively smaller, and the cross section of upper wedge block is an isosceles trapezoid after optimization. The vertical vibration displacement of the cutter mount and the wedge block are reduced by \(\sim \)67 % and 53 %, respectively. The vibration damage of cutter system is greatly reduced. The research of this paper may provide a theoretical guidance for the structure design of the cutters.
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References34
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#1Hoyoung Jeong (SNU: Seoul National University)H-Index: 6
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Nonlinear forced vibration of a cantilever beam with an intermediate lumped mass is studied, and the nonlinear governing equation of the vibrating beam using Euler鈥揕agrange method is derived. Two types of nonlinearities, including the inertial term and the elastic part, are included in the nonlinear differential equation of motion. The multiple scales method is adopted as the solution procedure for this problem and the conditions of the primary and secondary resonances of the system are investig...
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Abstract The cutterhead endures strong, multi-point distributed impact loads when the full face rock tunnel boring machine (TBM) tunnels, which leads to intense vibration and fatigue fracture. Accordingly the structure should meet the requirement of service life considering the fracture failure at weak locations. Hence, cutterhead damage mechanism is crucial to predict and analyze residual life of a operational cutterhead under impact loads. This paper combines with the characteristics of cutter...
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Damage by excessive vibration is serious engineering problem in TBM boring process. Dynamic characteristic analysis is essential for TBM antivibration design. According to TBM horizontal support structure, a dynamic coupling nonlinear model is established, with consideration of time-varying impact load and multicomponent complex relationship from cutter to gripper shoe. A set of field vibration tests is set up to accurately collect data under extreme work conditions; then, field data is collecte...
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Analyses of rock failure mechanisms beneath disc cutters are presented. Full-scale cutting tests are conducted to assess the global energy input in comparison with rock chips and excavated volume. Small-scale cutting tests are subsequently used for macro- and microscopic analyses of rupture modes and crack propagation. A high spatial resolution allows to obtain pictures of crack networks in different rock types. It is shown that all specimens develop lateral cracks in sufficiently confined areas...
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