Stiffness Analysis of Parallel Manipulators with Preloaded Passive Joints [chapter]

A. Pashkevich, A. Klimchik, D. Chablat
2010 Advances in Robot Kinematics: Motion in Man and Machine  
The paper presents a methodology for the enhanced stiffness analysis of parallel manipulators with internal preloading in passive joints. It also takes into account influence of the external loading and allows computing both the non-linear "load-deflection" relation and the stiffness matrices for any given location of the end-platform or actuating drives. Using this methodology, it is proposed the kinetostatic control algorithm that allows to improve accuracy of the classical kinematic control
more » ... nd to compensate position errors caused by elastic deformations in links/joints due to the external/internal loading. The results are illustrated by an example that deals with a parallel manipulator of the Orthoglide family where the internal preloading allows to eliminate the undesired buckling phenomena and to improve the stiffness in the neighborhood of its kinematic singularities.
doi:10.1007/978-90-481-9262-5_50 fatcat:und4hl4ggff25g7623qol5zbfe