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Stiffness analysis of multi-chain parallel robotic systems with loading

Pashkevich A., Klimchik A., Chablat D., Wenger P.

Journal of Automation Mobile Robotics and Intelligent Systems

2009

Vol. 3, No. 3

75-82

The paper presents a new stiffness modelling method for multi-chain parallel robotic manipulators with flexible links and compliant actuating joints. In contrast to other works, the method involves a FEA-based link stiffness evaluation and employs a new solution strategy of the kinetostatic equations, which allows computing the stiffness matrix for singular postures and to take into account influence of the external forces. The advantages of the developed technique are confirmed by application examples, which deal with stiffness analysis of a parallel manipulator of the Orthoglide family.