Deflection Compensation Analysis of a 3-RRS Parallel Mechanism

Abstract Parallel mechanisms have the advantage of high rigidity, large payload capability, and so on, but positioning accuracy is affected by elastic deflection arising from external load gravity. An approach to improving compensating presented with a 3- R RS parallel mechanism as research object. The implemented introducing springs on moving platform limbs. Taking load, spring force, gravity, mechanical models are established, which can effectively separate influence force gravity at endpoint. In addition, considering constraints mechanism’s operating capacity, springs’ layout parameters optimization design studied based compensation effect global platform. example shows that method compensate for deflection, applied has best effect, 91% deflection.