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Abstract: A
single-stage servo valve using direct piezoelectric actuator drive is
proposed. It takes advantages of the higher bandwidth and resolution.
The structure of the valve is compact and the antipollution capability
is perfect. The large stroke multilayer piezoelectric actuator is served
as the drive element that drives the power-stage spool directly.
Bidirectional control of the spool is realized by the spring plate
mechanism and single multilayer piezoelectric actuator. The displacement
of the spool is measured by strain gauge which is bonded to the spring
plate mechanism. The spring plate is analyzed by finite element method.
Piezoelectric direct drive servo valve prototype is trial-manufactured
and tested. The results show that the bandwidth is up to 1 kHz. The new
servo valve can be applied to many high response occasions such as high
frequency vibration experimental bed, durability test bed. It will
enhance the response characteristic of these systems.
Key
words: Piezoelectric
actuation Spring plate mechanism Direct drive
Electro-hydraulic servo valve
CLC No: TH137
Received 20031209, received in revised form
20040628 |