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Volume 40 Issue 7
Jul.  2014
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Journal of Beijing University of Aeronautics and Astronautics  > 2014  >  40(7): 861-866.
Fan Rui, Liu Huan, Wang Danet al. Statics and stiffness of 3 DOF parallel loading mechanism[J]. Journal of Beijing University of Aeronautics and Astronautics, 2014, 40(7): 861-866. doi: 10.13700/j.bh.1001-5965.2013.0491(in Chinese)
Citation: Fan Rui, Liu Huan, Wang Danet al. Statics and stiffness of 3 DOF parallel loading mechanism[J]. Journal of Beijing University of Aeronautics and Astronautics, 2014, 40(7): 861-866. doi: 10.13700/j.bh.1001-5965.2013.0491(in Chinese)
shu

Statics and stiffness of 3 DOF parallel loading mechanism

doi: 10.13700/j.bh.1001-5965.2013.0491

  • School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 18 Sep 2013
  • Publish Date: 20 Jul 2014
    Abstract
  • A static model of a 3-DOF parallel mechanism (PM) that is used for computerized numerical control (CNC) machine tool follow-up loading test was established based on the screw theory. The mapping between actuation force and loading force of the moving platform was built considering the influence of limbs' weight. Then the distribution of actuation forces in workspace under specified loads was analyzed through a numerical example. Moreover, the static stiffness mapping model of the PM was established. The model considers influences of the limbs' weight and the parts' elastic deformation under the constraint force. At last the deformation of the PM in the workspace under given static loads was analyzed and the stiffness characteristic was evaluated. The results show that the distribution of stiffness in workspace is symmetrical about the y-axis and the stiffness will be worsened when it comes near the workspace boundary.

     

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