Overactuation: A solution for the accuracy–throughput speed contradiction in parallel axis positioning systems

A.M. van der Wielen, F.L.M. Delbressine, P.H.J. (Piet) Schellekens

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

In parallel axis positioning systems an accuracy–throughput speed contradiction is present. The configuration is often such that the minimum number of actuators from kinematic point of view is used. The mechanical system should possess sufficient stiffness but also low mass. Structural stiffness, and hence accuracy, is obtained at the cost of mass. In intermittent motion systems the moving mass should be minimized, because it limits the attainable acceleration and thus the throughput speed. This dynamic performance barrier can be shifted with additional parallel actuators. To enhance prudence in the initial design phase, knowledge about the opportunities and limitations of parallel axis systems is required. The basic dynamical aspects of parallel axis positioning systems, with a minimum and additional number of parallel actuators, are examined for beam and plate systems. The results of the numerical models are verified with an experimental plate system.
Original languageEnglish
Pages (from-to)1732-1743
JournalMechanism & Machine Theory
Volume46
DOIs
Publication statusPublished - 2011

Keywords

  • Redundant actuation
  • Positioning system
  • Parallel actuation
  • Dynamic error

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