Piezoelectric vibration energy harvesting
l Multi-directional energy harvesting by a single piezoelectric cantilever;
Acoustic metamaterial and wave propagation
l Negative capacitance circuit for piezoelectric transducer based tunable metamaterial; Stability analysis of electro-mechanical system with negative capacitance circuit;
l Metamaterial based continues wave beam steering;
l Piezoelectric metamaterial experiments;
Piezoelectric based sensing system
l PVDF as actuator & sensor for metal structure damage detection, detection of extreme weak signal;
l Railway damage detection, impedance match for actuators and sensors for railway beam.
Piezoelectric transformer with high power density
l Piezoelectric transformer with high power density by heat radiator (power density of 135W/cm3);
l Theoretical dynamic analysis and FEA simulation of the piezoelectric transformer;
l Life analysis and structure optimization.
Magnetostrictive torque sensor
l Design, simulation and testing of magnetostrictive torque sensing system;
l For Stanley Black & Decker, Inc.
Self-fabricated instruments for measurement
* Resistance strain gauge and the associating circuits, full bridge, AC&DC excitation;
* Coil & piezo based steady-state magnetic sensor and the associating analogy circuits, lock in amplifier;
* High voltage power supply for piezo actuators, phase lock loop;
* Piezo based force sensor and the associating analogy circuits, lock in amplifier;
* Eddy current displacement sensor and the associating analogy circuits, full bridge, lock in amplifier;
* Signal generator and oscillator by Audio Cards, cooleditor;
* Piezo stack, 1-3 piezo composite;
These instruments/sensors were made for fun / limited budget / export restraints of US.