| 摘要 |
A piezoelectric actuator has a substantially increased critical buckling load and resistance to bending moments. The actuator includes a piezoelectric stack having a first column end, a second column end, and a first intermediate section. A rigid support device is axially aligned with the stack. The support device is moveably coupled to the stack at the first and second column ends such that rotational, lateral and vertical displacement of the stack is restrained and axial displacement of the stack is permitted at the column ends. The support device is further moveably coupled to the stack at at least one intermediate section such that rotational, lateral and vertical displacement of the stack is restrained and axial displacement of the stack is permitted at the intermediate section. The support device includes a support structure disposed adjacent to the stack, and an end restraint assembly fixedly coupled to the column ends. The end restraint assembly is also moveably coupled to the support structure. An intermediate restraint subassembly is fixedly coupled to the intermediate section and moveably coupled to the support structure.
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