Research Papers

Piezohydraulic Actuator Development for Microjet Flow Control

[+] Author and Article Information
William S. Oates, Fei Liu

Department of Mechanical Engineering, Florida Center for Advanced Aero Propulsion (FCAAP), Florida A&M /Florida State University, 2525 Pottsdamer Street, Tallahassee, FL 32306

J. Mech. Des 131(9), 091001 (Aug 17, 2009) (9 pages) doi:10.1115/1.3158986 History: Received November 15, 2008; Revised April 23, 2009; Published August 17, 2009

This paper describes the development of a piezohydraulic actuator for broadband microjet flow control applications. The actuator utilizes a lead zirconate titanate (PZT) stack actuator and a hydraulic amplification design to achieve relatively large displacements in a compact actuator to control flow through a microjet orifice. Displacement amplification of 81 times the stack actuator displacement was achieved using a new dual-diaphragm design. The nonlinear and hysteretic field-coupled material behavior, structural dynamics, and fluid dynamics of the actuator are modeled using a system dynamic model and compared with experimental results. The nonlinear and hysteretic piezohydraulic actuator characteristics are shown to be strongly dependent on the nonlinear deformation of the rubber diaphragm and minor loop hysteresis of the PZT stack actuator. The modeling technique provides a design tool for broadband performance predictions and system optimization to facilitate implementation of the actuator in a flow environment.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

(a) A cross section of the piezohydraulic actuator. (b) Prototype of the piezohydraulic actuator. A bleed valve is located on the top left for purging air. The rubber diaphragm is located underneath the top plastic microjet interface.

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Figure 2

The schematic of the hydraulic system used to charge the piezohydraulic actuator with fluid and remove entrained air

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Figure 3

The schematic of the drive electronics and data acquisition system used to characterize the piezohydraulic actuator

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Figure 4

Response of the piezohydraulic actuator for a sinusoidal voltage input at 1 Hz. The legend denotes the bias pressure used at different voltage amplitudes.

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Figure 5

The electrofluid-mechanical system dynamic model for the piezohydraulic actuator

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Figure 6

(a) Comparison of the linear piezoelectric model, nonlinear ferroelectric homogenized energy model and experimental results at 1 Hz. (b) Comparison of rate dependent actuation and homogenized energy model estimates for frequencies up to 300 Hz.

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Figure 7

The hydraulic cylinder head and diaphragm subsystem. The external diaphragm is shown in an equilibrium deformed state in the presence of an internal bias pressure.

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Figure 8

Inflation pressure P2 versus stretch λ based on parameters in Table 5. In (a), the hyperelastic constitutive law given by Eq. 16 was used to predict pressure as a function of stretch. In (b), the system dynamic response is shown by computing pressure versus stretch using the fully coupled system dynamic model for a 1 Hz, 2 MV/m field input to the stack actuator.

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Figure 9

System dynamic model comparisons of the piezohydraulic actuator experimental results. Minor loop ferroelectric hysteresis of the stack actuator is shown to affect piezohydraulic actuation.

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Figure 10

Rate dependent predictions of the piezohydraulic actuator using the nonlinear system dynamic model coupled to the rate-dependent homogenized energy model




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