Title page for ETD etd-11062008-125940

Type of Document

Thesis

Author

Liu, Fei

Author's Email Address

fl07@fsu.edu

URN

etd-11062008-125940

Title

Piezohydraulic Actuator Development For Active Microjet Flow Control

Degree

Master of Science

Department

Mechanical Engineering, Department of

Advisory Committee

Advisor Name	Title
Farrukh S. Alvi	Committee Member
William S. Oates	Committee Member
Jonathan Clark	Outside Committee Member

Keywords

Flow Control
Microjet
Piezoelectric
Actuator

Date of Defense

2008-09-17

Availability

unrestricted

Abstract

This thesis describes the development of a new piezohydraulic actuator for integration into a microjet flow control system. The piezohydraulic actuator utilizes a lead zirconate titanate (PZT) stack actuator and a hydraulic amplification design to achieve relatively large displacements required to control flow through a microjet with an orifice diameter of approximately 400 ƒÝm. Displacement amplification of 81 times the stack actuator displacement was achieved using a dual-diaphragm design to seal the fluid within a converging nozzle.
The piezohydraulic actuator is characterized and compared to a system dynamic model to identify underlying subsystem behavior that contributes to the system level piezohydraulic actuation. System dynamic modeling has been previously used to estimate the dynamic performance of similar piezohydraulic pump systems. These models are useful for identifying subsystem dynamics and design optimization. Here, a similar modeling framework is implemented and extended to include nonlinear and hysteretic ferroelectric behavior using a homogenized energy framework and hyperelastic behavior of the rubber diaphragm material. It is shown that minor loop hysteresis of the piezoelectric stack actuator and nonlinear deformation of the diaphragm play an important role in the large piezohydraulic displacement amplification.

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