Displacement amplification ratio modeling of bridge-type nano-positioners with input displacement loss

Abstract

Abstract. This paper presents an improved modeling method for bridge-type mechanism by taking the input displacement loss into consideration, and establishes an amplification ratio model of bridge-type mechanism according to compliance matrix method and elastic beam theory. Moreover, the amplification ratio of the designed bridge-type nano-positioner is obtained by taking the guiding mechanism as the external load of bridge-type mechanism. Comparing with existing methods, the proposed model is more accurate, which is further verified by finite element analysis(FEA) and experimental test. The consistency of the results obtained from theoretical model, FEA and experimental testing indicates that the proposed model can accurately predict the amplification characteristics of nano-positioners, which helps the analysis and design of bridge-type nano-positioners in practical applications.

Nonlinear design, analysis, and testing of a single-stage compliant orthogonal displacement amplifier with a single input force for microgrippers

“…bridgetype mechanisms [18][19][20][21][22][23] and single-stage compliant orthogonal displacement amplifiers (CODAs) with a single input force [13,24], can transmit movements orthogonally, which is necessary for realizing parallel grasping in a compact design. Linear static analysis and parametric optimization [18,19,[25][26][27][28][29][30], nonlinear static analysis [31,32], dynamic analysis/test [33,34], and structural improvement [12, 20-23, 35, 36] of the bridge-type mechanism have been presented. To eliminate parasitic movements in output ports, a fully symmetric configuration and bidirectionally symmetric input forces/displacements are needed for the bridge-type mechanism.…”