PIEZOMECHANICS
Contents of the Master's Course1. PROBLEMS IN MODERN PRECISION ENGINEERINGPrecision 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 THEORYPiezoelectric 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 STRESSESThe 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 SYSTEMSThe 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 DRIVESBasic 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 TRANSFORMERSGeneral 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 WORKSDirect 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. BanseviciusDirector 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 |