"Overburden excavation is an integral component of the surface mine production chain. In large mines the walking dragline is a dominant strip mining machine because of its economic advantages. Production engineers and operators must be guided by appropriate strategies to preserve the structural and operating performance of this equipment. The dragline performance is a function of its spatial kinematics, dynamics and the stress loading of its front-end assembly. Previous research studies lack the robust fundamental theories for comprehensive dragline dynamic simulation and reliability. This research study advances existing knowledge and frontiers in dragline performance. It develops the kinematics and dynamics of a dragline front-end assembly using the vector loop and simultaneous constraint methods. The bucket-formation interaction is modeled using the discrete element method. The boom stress loading is modeled using finite element analysis and dynamic model results.
Detailed analysis of the simulation results show that the maximum closure error from the vector loop is 4X10E-8, which is less than the required tolerance of 10E-6 . The angular accelerations of the drag and hoist ropes are close to zero, which indicate very smooth simulated operations. The respective maximum drag, cutting and hoist forces are 100 kN, 200 kN and 75 kN, which also indicate a dominant drag operation. The maximum stress loading of the boom's ARM-1 (166.5 MPa) and ARM-2 (159.9 MPa) are less than the boom yield stress at 305 MPa. These results indicate machine health and longevity within the simulated conditions. The study forms the basis for new research and comprehensive drag line simulators. The main novelty includes the use of the vector loop and simultaneous constraint theories to formulate the kinematics, dynamics and stress loading of a dragline in simulated digging conditions"--Abstract, page iii.
Grayson, R. Larry
Saperstein, Lee W.
Summers, David A.
Newkirk, Joseph William
Ph. D. in Mining Engineering
Robert H. Quenon Endowment Fund
Natural Sciences and Engineering Research Council of Canada
University of Missouri--Rolla
xvi, 148 pages
© 2007 Nuray Erdogan Demirel, All rights reserved.
Dissertation - Restricted Access
Machinery, Kinematics of
Dynamics -- Mathematical models
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://merlin.lib.umsystem.edu/record=b5946885~S5
Demirel, Nuray, "Dynamic dragline modeling and boom stress analysis for efficient excavation" (2007). Doctoral Dissertations. 1707.
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