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Improving the extricating performance of TBM cutter-head driving system with hydro-viscous clutch

This paper presents a new cutter-head driving system of tunnel boring machine (TBM) with hydro-viscous clutch (HVC) applied in order to improve the extricating performance, and a kind of theoretical methodology is proposed to analyze the extricating performance of HVC. Firstly, the Navier-Stokes equations are reduced upon the characteristics of oil film within HVC and the dynamical mathematical models of cutter-head system in the process of extrication are established. Then an approximate iteration algorithm is adopted to solve the NS equations and the analytical expression of the HVC output torque is obtained. Therefore the real-time simulation for the extricating process is performed. The theoretical results are validated in an experimental rig containing one friction pair. It is confirmed that the theoretical methodology is valid for the good agreement between the theoretical and experimental results. The results reveal that the HVC can indeed improve extricating performance of TBM cutter-head especially in relieving rigid impact. Furthermore, this also provides a design idea for the rotating speed regulating system especially in large mechatronics equipment when the hydro-viscous clutch is applied.