The formula suggests, that the actuator stiffness has to be high in comparison with the load to in order to maximize the useable displacement of a piezo stack.
In case of a
spring-type load an actuator stack has to chosen which free displacement is larger by a factor than the maximum given displacement X:
The blocking force of the actuator stack has also to be chosen by the same factor larger than the max load force.
The equilibrium can also be determined graphically in a displacement-force diagram. The following figure explains the case of a soft spring load as well as a stiff load, where resulting displacements are smaller. The dotted lines of load crosses the lines (solid) which represent the actuator at different voltages.
Performance made of Passion.
Piezotechnics by
Piezotechnics GmbH
Germany