Piezo
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• Piezoelectric Material    

Piezoelectricity is the ability of some materials to generate an electric potential in response to applied mechanical stress. This may take the form of a separation of electric charge across the crystal lattice. If the material is not short-circuited, the applied charge induces a voltage across the material. The piezoelectric effect is reversible in that materials exhibiting the direct piezoelectric effect (the production of electricity when stress is applied) also exhibit the converse piezoelectric effect (the production of stress and/or strain when an electric field is applied). Piezoelectric material can be applied to various fields such as motors, actuators, ultrasonic humidifier and so on.

In a piezoelectric crystal, the positive and negative electrical charges are separated, but symmetrically distributed, so that the crystal overall is electrically neutral. Each of these sites forms an electric dipole and dipoles near each other tend to be aligned in regions called Weiss domains. The domains are usually randomly oriented, but can be aligned during poling, a process by which a strong electric field is applied across the material, usually at elevated temperatures. When a mechanical stress is applied, this symmetry is disturbed, and the charge asymmetry generates a voltage across the material. Piezoelectric materials also show the opposite effect, called converse piezoelectric effect, where the application of an electrical field creates mechanical deformation in the crystal.


<Micro-Mechanism of Piezoelectric Material>

 

2. Research Fields

In this laboratory, various researches using piezoelectric material are in progress.

    • Vibration control of a Flexible Beam using Piezoelectric Films.
    • Force Tracking Control of a Flexible Gripper Driven by a Piezoceramic Actuator
    • Vibration control of a smart beam structure using ER Fluid and Piezoelectric Films.
    • Active structural acoustic control of a smart plate featuring Piezoceramic actuators
    • Control of a bowl parts feeder activated by piezoceramic actuators
    • Position and Force Control of a Two-Link Flexible Manipulator with Piezoceramic Actuators
    • Pressure control of a pneumatic valve system using a Piezoceramic actuator.
    • An investigation on piezoelectric energy harvesting for MEMS power sources
    • Vibration control of an HDD disk-spindle system using piezoelectric bimorph shunt damping
    • Active vibration control of smart hull structures using piezoelectric actuators
    • Multi-mode vibration reduction of a CD-ROM drive base using a piezoelectric shunt circuit
    • Control of a Jetting Dispenser for Semiconductor Electronic Packaging using piezoelectric actuators
    • Vibration control of a hybrid mount using piezoelectric actuator and MR fluid.
    • Developments of an active hybrid mount for Hull structure.

     

    • Applications

      (1) Hybrid Mount


    <Piezo Hybrid Mount for navy ship>

     

      (2) Smart Hull Structure


    <Smart Hull Structure>

      

      (3) Information Storage Devices


    <Optical Pick-Up for ODD>

    <Piezoelectric Bimorph for HDD>

     

      (4) Piezoelectric Pump


    <Piezoelectric Pump>

     

      (5) Piezoelectric Dispensor


    <Piezoelectric Dispensor>

  
   
 
 
 

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