INVESTIGATION OF INFLUENCES OF FABRICATION TOLERANCES ON OPERATIONAL CHARACTERISTICS OF PIEZO-ACTUATED STICK-SLIP MICRO-DRIVES

Piezo-actuated stick-slip micro-drives (PASSMDs) are often used in microrobotic applications due to their advantages of a straightforward design and good operational characteristics. In this work, influences fabrication tolerances on characteristics PASSMDs theoretically investigated. A dynamic model describing the whole macroscopic movement driver’s runner actuators, microscopic behavior frictional contacts using method dimensionality reduction, was used. Three essential parameters drives including angle between working surfaces runner, alignment two actuator blocks each side stiffness an individual actuator, whose values impacted by tolerance assembly process, were considered as input investigation. By performing hybrid-dynamic simulations, these drives' characteristics, repeatability step length, critical amplitude phenomenon, maximal-achievable driving frequency/velocity, evaluated. Simulation results show that significantly influence drives. The contribution work is so important several phenomena PASSMDs, which experimentally detected, physically explained for first time. could help designers optimize better generations PASSMDs.