TY - JOUR

T1 - Overactuation: A solution for the accuracy–throughput speed contradiction in parallel axis positioning systems

AU - van der Wielen, A.M.

AU - Delbressine, F.L.M.

AU - Schellekens, P.H.J. (Piet)

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

KW - Redundant actuation

KW - Positioning system

KW - Parallel actuation

KW - Dynamic error

U2 - 10.1016/j.mechmachtheory.2011.06.007

DO - 10.1016/j.mechmachtheory.2011.06.007

M3 - Article

VL - 46

SP - 1732

EP - 1743

JO - Mechanism & Machine Theory

JF - Mechanism & Machine Theory

SN - 0094-114X

ER -