This paper presents the structure design and optimization of a clamping mechanism for an inchworm-type piezoelectric
actuator. Since the performance of clamping mechanism will decide the feasibility of inchworm-type actuator, design
and fabrication of better clamping mechanism will continuously be part of the focus in inchworm-type piezoelectric
actuator design. Currently the driving force of piezoelectric inchworm actuator is usually not high enough. In order to
more efficiently design the clamping mechanism, numerical simulation is performed to select the geometry parameters
that can improve the performance. As a kind of numerical simulation method, ANSYS Optimization Design Method is
used to analyze and optimize the performance of the clamping mechanism. In this design, a special kind of piezoelectric
ceramic and 65Mn are chosen as the main materials; the dimensions of clamping mechanism and a pre-load force are
chosen as design variables; the maximum von Misses stress and the holding forces are chosen as state vectors. When
clamping the holding force should reach the maximum and when releasing the holding force should arrive at the
minimum. In accordance with this requirement, an objective function is constructed. When the objective function reaches
the minimum value, the best design set will be attained. The results of simulation experiments and optimization analysis
show that the clamping mechanism can reach the desired performance and has an adequate self-locking force when
power off. A prototype of the clamping mechanism has been fabricated and tested to validate the simulation results.
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