Three circular piezoelectric actuators: Bimorph, Thunder, and Radial Field Diaphragm (RFD) function as oscillating diaphragms within a cavity to produce a zero net mass flux air jet. To characterize each diaphragm, displacement response and vibrational characteristics with varying mechanical and electrical boundary conditions were investigated using a saw tooth waveform at 5 Hz. Clamping pressu...

In the middle 90s, the Face Companies created Face International Corporation to focus R&D efforts on high tech applications in the field of piezoelectric technologies. Since then, the company has developed a portfolio of over 50 US patents and several international Patents. The company is currently commercializing three breakthrough technologies including high deformation Thunder piezoelectric ...

Lightning generates sound waves across a wide range of frequencies, including infrasonic below 20 Hz. Source mechanism for these low frequency pulses is still area debate. Infrasound detected after rapid changes electrostatic field during the thunderstorm activity were analyzed. The measurements done by large aperture array absolute microbarometers located in Western part Czech Republic. Distan...