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A generic force-closure analysis algorithm for cable-driven parallel manipulators. (English) Zbl 1219.70010
Summary: Cable-driven parallel manipulators (CDPMs) are a special class of parallel manipulators that are driven by cables instead of rigid links. Due to the unilateral driving property of cables, the cables in a CDPM must always maintain positive tension. In this paper, a methodology based on convex analysis is developed for the force-closure analysis of fully-constrained CDPMs. This method is systematic, easy to implement and satisfies both the necessary and sufficient conditions. The key point of this method is to define a critical vector that must be positively expressed by the tension vectors associated with the driving cables. The solution can be found by resolving a limited set of linear equations. Following the same approach, the method is also extended to generate the static workspace for under-constrained CDPMs. Therefore, this generic force-closure analysis can cater to the workspace analysis of both fully-constrained and under-constrained CDPMs. The computationally efficiency of the algorithm is verified through simulations.
MSC:
70B15Mechanisms, robots (kinematics)
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