Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1987-05-19
1989-07-18
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310326, 310330, 310331, 310340, 310339, 310316, 310317, 29 2535, H01L 4108
Patent
active
048496685
ABSTRACT:
A composite structural member includes multiple layers with one or more embedded piezoelectric elements. In a conductive member, an insulating sheath electrically isolates each piezoelectric element while mechanically coupling it to the surrounding layers, forming a unitary structure with substantially homogeneous mechanical properties. In a graphite fiber composite structure, the piezoelectric elements are fitted in recesses in one or more interior layers, and located away from strain nodes of the structural members. Preferably pairs of elements are placed on opposite sides of a node and are driven in opposing phases to induce displacement of the structure. In a preferred prototype structure Kapton film insulates the piezoelectric elements, maintaining its integrity during a high temperature, high pressure curing process. An acrylic cement secures the insulator to the elements. Systems according to the invention include vibration damping systems, and aerodynamic lift surfaces or RF reflective surfaces with high authority control. A tubular truss member with axial control characteristics is described.
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AIAA,/ASME/ASCE/AHS 27th Structures, Structural Dynamics and Materials Conference, Part I, pp. 116-124, Experimental Verifications of Distributed Piezoelectric Actuators for Use in Precision Space Structures, E. F. Crawley & J. De Luis (1986).
Space Systems Laboratory Report SSL#20-85. The Use of Peizo-Ceramics as Distributed Actuators in Flexible Space Structures, J. de Luis and E. F. Crawley, 1985.
Crawley Edward F.
de Luis Javier
Budd Mark O.
Massachusetts Institute of Technology
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