Abstract
The shield machine is a heavy construction machine for tunnel excavation, and the segment erector is an important subsystem of the shield machine. It is difficult to achieve precise control in the 6-DOF (degree of freedom) erector in the 2-DOF 5-bar radial mechanism. Hence, this paper proposes a redundantly actuated PRPRP radial mechanism for the segment erector. When the redundant actuator is unlocked, the radial mechanism is able to adjust its posture, which has two degrees of freedom. On the other hand, when the redundant actuator is locked or produces enough pre-tightening tensile force, the PRPRP mechanism can ensure the synchronization of the two driving hydraulic cylinders along the radial direction based on the mechanical structure, which has one degree of freedom. The redundant actuator also facilitates the equal application of two flexural torques at the hydraulic cylinders; thus, preventing the overload of a single cylinder.
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References
Takashi W, Toshiharub T, Tsuyoshic A, Katsuhiko M. Development of a new composite structure segment for large diameter shield tunnel. Tunnelling and Underground Space Technology, 2004, 19(4–5): 449–450
Qian X, Gao F, Guo W. Design and analysis of 6-DOF segment erector mechanism for shield machine. Machine design and research, 2008, 24(1): 17–20
Nokleby S B, Fisher R, Podhorodeski R P, Firmani F. Force capabilities of redundantly-actuated parallel manipulators. Mechanism and Machine Theory, 2005, 40(5): 578–599
Wu J, Wang J, Wang L. Optimal kinematic design and application of a redundantly actuated 3-DOF planar parallel manipulator. Journal of Mechanical Design, 2008, 130(5): 054503
Garg V, Nokleby S B, Carretero J A. Wrench capability analysis of redundantly actuated spatial parallel manipulators. Mechanism and Machine Theory, 2009, 44(5): 1070–1081
Bu W, Liu Z, Tan J, Gao S. Detachment avoidance of joint elements of a robotic manipulator with clearances based on trajectory planning. Mechanism and Machine Theory, 2010, 45(6): 925–940
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Bu, W., Liu, Z., Tan, J. et al. A redundantly actuated PRPRP radial mechanism in the segment erector of a shield machine for synchronization control. Front. Mech. Eng. 6, 463–467 (2011). https://doi.org/10.1007/s11465-011-0225-z
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DOI: https://doi.org/10.1007/s11465-011-0225-z