PIEZOMECHANICS

 

Contents of the Master's Course

1. PROBLEMS IN MODERN PRECISION ENGINEERING

Precision Mechanics: incompatible demands for accuracy, high speed, dexterity, efficiency and reliability.
Mechanical devices in extreme conditions.
"Smart'' materials and structures.
The concept of PIEZOMECHANICS.

2. PIEZOELECTRICITY: CONCEPTIONS AND BASIC THEORY

Piezoelectric properties and fundamentals of piezoelectric energy converters; direct and reverse piezoeffect.
Piezoactive materials: piezoelectric, electrostrictive, magnetostrictiveand elastic piezoactive compounds.
Transducers with variable polarisation vector.

3. PIEZOELECTRIC DEVICES WITH STATIC AND QUASI-STATIC DISPLACEMENTS OR STRESSES

The motion of rigid and deformable bodies.
Control of motion: systems with one degree of freedom.
Control of motion: systems with several degrees of freedom.
Structure control of mechanical systems.
Selecting topology of exciting zones.
Direct piezoeffect: energy transformation.
Applications: Actuators with limited and unlimited number of degrees of freedom; Adaptive optics; Stress generation and control; Adaptive machine tools with controllable errors; Measuring devices, Mechanical/electrical energy transformation devices, etc.

4. RESONANT PIEZOELECTRIC SYSTEMS

The basic theory of resonant piezoelectric energy converters.
Piezoelectric sensors.
Adaptive sensors.
Piezoelectric transformers of energy.
Complex transducers - combination of piezoelectric and magnetostrictive materials.
''Smart'' composites: matrix of properties.
Multi-functional devices.
Applications: Transducers for ultrasonic testing; Friction control;
Nondestructive hardness testing; Stiffness, surface rheology, natural frequency measuring systems; Squeeze-film bearings; Piezoelectric gyroscopes (two types), Robot's eye; Active supports, bearings and slides.

5. TRANSFORMERS OF MOTION - PIEZOELECTRIC DRIVES

Basic considerations, types and theory.
Systems with one degree of freedom.
Kinematic structure control.
Systems with several degrees of freedom.
Actuators/sensors for microrobots.
Actuators with separate power and control systems.
Two channel control.
Applications: Precision Mechanics; Adaptive Mechanics; Intelligent mechanisms; Microsurgery; Bearings with zero friction; Active bearings, guides and supports; Measurement systems; Diagnostics in machinery; Optical scanning devices, etc.

6. ELASTIC PIEZOELECTRIC TRANSFORMERS

General theory.
Elastic piezoactive materials.
Piezoeffect of organic composites (wood, bones, skin, etc.) and its interrelation with systems parameters.

Applications: In medicine; Adaptive optics; Measurements; Vibration, Sound and noise control, Piezocable, Piezoelectric loudspeaker, Diagnostics and identification, etc.

7. LABORATORY WORKS

Direct and reverse piezoeffect.
Hysteresis in piezoactuators with quasi-static displacements and its control.
Generating small multi-component motions.
Friction control with three types of oscillations.
Investigating squeeze-film bearing.
Combined piezoelectric and magnetostrictive transducers: static and dynamic characteristics.
Piezoelectric actuators with one degree of freedom: characteristics in transient and steady state motion.
Investigating the active bearing.
Investigating the active kinematic pair with three degrees of freedom.


Course reader:

Prof. R. Bansevicius
Director of Institute of Piezomechanics
Kaunas University of Technology
Kestucio 27, LT-3004 Kaunas LITHUANIA
Tel./Fax +370-7-323884;
E-mail: bansevicius@cr.ktu.lt