What are the distinctive features of PYTHEAS Technology’s vibration absorbers?
Piezoelectricity is in PYTHEAS Technology’s DNA. Among other innovative devices, we have developed piezoelectric vibration absorbers, also called piezoelectric resonators.
Adding piezoelectric elements, piezoceramics or patches of different sizes and shapes, allows an electromechanical energy conversion to happen. The piezoelectric element can convert part of the vibration’s mechanical energy into electrical energy. An electronic circuit, called “shunt”, is connected to the piezoelectric element to collect and disperse the extracted electric energy.
Piezoelectric resonators present better performances than usual TMDs with similar added mass (purple curve). This performance improvement is due to the electromechanical energy conversion and the shunt used to dissipate the vibration energy.
Coupling the piezoelectric element with « smart » electronics can provide attractive properties. For instance, the resonant frequency of the absorber can be adjusted to follow evolutions of the structure or several frequencies can be processed with a unique device.
The use of piezoelectricity presents another advantage: in addition to dissipating and reducing parasitic vibrations, piezoelectric resonators can be used to develop energy harvesting solution. Instead of dissipating the electrical energy generated by the piezoelectric materials, we can harvest part of this electricity, which can be stored and exploited.