Proof-of Principle Investigation of 300 W(E) Stirling Engine Piezoelectric (STEPZ) Generator
Final technical rept.
MCDONNELL DOUGLAS ASTRONAUTICS CO RICHLAND WA DONALD W DOUGLAS LABS
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The objective of the effort was to investigate feasibility of a unique electric power generator. The concept uses pressure pulses generated by a modified Stirling engine to drive a piezoelectric generator. A hydraulic coupler, analogous to the flywheel and mechanical coupling of a conventional engine generator set, is used for optimum coupling between the engine and generator. The final report describes the computer assisted analysis and mechanical design of a proof-of-principle engine-coupler system which will operate into a simulated load. The design approach is concluded to have a high degree of probability for successfully demonstrating the concept. Piezoelectric generator materials were tested at high stress levels to assess the practicability of the generator. Life tests were performed for four piezoelectric stacks with two different surface finishes and ambient temperatures of -25 to 150F. Results showed typically less then 5 performance degradation at peak stress levels near 9000 psi with up to 7.2 x to the 8th power stress cycles accumulated on a single stack.
- Electric Power Production and Distribution