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Accurate nonlinear modeling for flexible manipulators using mixed finite element formulation in order to obtain maximum allowable load

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Abstract

In this study, the researchers try to examine nonlinear dynamic analysis and determine Dynamic load carrying capacity (DLCC) in flexible manipulators. Manipulator modeling is based on Timoshenko beam theory (TBT) considering the effects of shear and rotational inertia. To get rid of the risk of shear locking, a new procedure is presented based on mixed finite element formulation. In the method proposed, shear deformation is free from the risk of shear locking and independent of the number of integration points along the element axis. Dynamic modeling of manipulators will be done by taking into account small and large deformation models and using extended Hamilton method. System motion equations are obtained by using nonlinear relationship between displacements-strain and 2nd PiolaKirchoff stress tensor. In addition, a comprehensive formulation will be developed to calculate DLCC of the flexible manipulators during the path determined considering the constraints end effector accuracy, maximum torque in motors and maximum stress in manipulators. Simulation studies are conducted to evaluate the efficiency of the method proposed taking two-link flexible and fixed base manipulators for linear and circular paths into consideration. Experimental results are also provided to validate the theoretical model. The findings represent the efficiency and appropriate performance of the method proposed.

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Correspondence to Moharam Habibnejad Korayem.

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Recommended by Associate Editor Kyoungchul Kong

Moharam Habibnejad Korayem was born in Tehran, Iran in 1961. He received his B.S. (Hon) and M.S. degrees in Mechanical Engineering from Amirkabir University of Technology in 1985 and 1987, respectively. He obtained his Ph.D. degree in Mechanical Engineering from the University of Wollongong, Australia in 1994. He is now a Professor of Mechanical Engineering at Iran University of Science and Technology. His research interests include dynamics of elastic mechanical manipulators, trajectory optimization, symbolic modeling, robotic multimedia software, mobile robots, industrial robotics standard, robot vision, soccer robot, and the analysis of mechanical manipulator with maximum load carrying capacity.

Habib Esfandiar was born in Iran in 1984. He is currently a Ph.D. degree student in Mechanical Engineering at Science and Research Branch, IAU, Tehran, Iran. His research has focused on dynamic modeling of flexible robotic manipulators, mobile robots, trajectory optimization, and game theory in engineering problems.

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Esfandiar, H., Korayem, M.H. Accurate nonlinear modeling for flexible manipulators using mixed finite element formulation in order to obtain maximum allowable load. J Mech Sci Technol 29, 3971–3982 (2015). https://doi.org/10.1007/s12206-015-0842-2

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  • DOI: https://doi.org/10.1007/s12206-015-0842-2

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