This research investigates smart
material actuators and valve concepts. Specically, a prototype pilot stage nozzle 
ap-
per valve is developed for the purpose of actuating a main stage spool. The typical
nozzle 
apper type servo valve uses a torque motor to actuate the 
apper. In this
research project, the torque motor has been substituted for two piezoelectric ring ben-
der actuators. A novel mounting mechanism has been developed to secure the ring
benders within the valve. Analytical and nite element models have been made to
understand the displacement mechanism of a ring bender and the eects of the mount
on the displacement and force from a ring bender, and the results were compared with
experiment. The mounting stiness at the inner and outer edges was found to decrease
the displacement of the ring bender and it was found that the stiness of the mount
at the outer edge has a greater negative eect on displacement than the stiness of the
mount at the inner edge.

Piezoelectric actuation of an aero engine fuel metering valve PDF

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