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Force-closure of spring-loaded cable-driven open chains: Minimum number of cables required & influence of spring placements | IEEE Conference Publication | IEEE Xplore

Force-closure of spring-loaded cable-driven open chains: Minimum number of cables required & influence of spring placements


Abstract:

While cable-driven systems offer the advantages of being lightweight with low moving inertia, the unilateral driving property of cables generally require them to have a g...Show More

Abstract:

While cable-driven systems offer the advantages of being lightweight with low moving inertia, the unilateral driving property of cables generally require them to have a greater number of actuators than their rigid-linked counterparts. This paper investigates the use of springs in an attempt to reduce the number of cables required. Given an n-DOF spring-loaded cable-driven open chain, several important questions arise: (i) How can force-closure analysis be carried out for a given spring and cable routing configuration? (ii) Are n+1 cables still necessary to fully constrain the entire open chain? (iii) What is the influence of spring placement on force-closure and cable tension required? This paper will address these concerns by proposing a systematic approach based on reciprocal screw theory. The analysis shows that an n-DOF spring-loaded cable-driven open chain still requires a minimum of n+1 cables to fully constrain it. From preliminary analysis, spring placement can have a positive effect on altering the cable tension required and increasing the feasible workspace.
Date of Conference: 14-18 May 2012
Date Added to IEEE Xplore: 28 June 2012
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Conference Location: Saint Paul, MN, USA

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