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PhD thesis content presentation

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Peerawan Wiwattananon

on 8 October 2013

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Transcript of PhD thesis content presentation

Piezoelectric Composite Actuators

Modelling of Static and Dynamic Behaviour

Peerawan Wiwattananon
Flow Separation
Thesis Objectives
what parameters influence actuators' behaviour under static and dynamic operating condition?
Static Study: Experimental Results vs Models

Dynamic Study: Experimental Results vs Models
Experimental vs Models
Dynamic Model + PZT properties (dynamic conditions)
Static Model + PZT properties (static conditions)
Static Behaviour
Experimental Results
Models: non-standard PZT properties
Models: Standard PZT properties
Conclusions: Static

Experimental Results
Experimental Results: no permanent displacement offset
Parameters influence an actuator's static performance:

1. The first parameter is its permanent displacement offset

2. The second parameter is its nonlinear response at high voltages

3. The third parameter is its linear response at low voltages
Dynamic Behaviour
Conclusions: Dynamic
Macroscopic Perspective:

1. Actuator's displacements has a direct relationship to the bending coefficient (defined in this thesis)

2. Actuator's resonance frequency has a direct relationship to the "reduced bending stiffness" (defined in this thesis)

Microscopic Perspective:

3. Reduction of piezoelectric material's compliance depends on actuator layup and it depends on internal stress inside a piezoelectric material.

4. Reduction of piezoelectric coefficient depends on internal stress inside a piezoelectric material.

Static: 3 parameters influence actuator's performance
displacement offsets, nonlinear response, linear response
piezoelectric material properties change in response to electric field and frequency

actuator's stiffness plays important role in displacement and resonance frequencies.
large bending coefficient --> large displacement
stiff actuator --> large resonance frequency
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