Both magnetostrictive and piezoelectric transducers are used in mechanical filters.
A new technology emerging in mechanical filtering is microelectromechanical systems (MEMS).
Another common piezoelectric material is quartz, which has also been used in mechanical filters.
While the meaning of mechanical filter in this article is one that is used in an electromechanical role, it is possible to use a mechanical design to filter mechanical vibrations or sound waves (which are also essentially mechanical) directly.
The precision applications in which mechanical filters are used require that the resonators are accurately adjusted to the specified resonance frequency.
This principle was not at first much used by waveguide filter designers, but it was used extensively by mechanical filter designers in the 1960s, particularly R. A. Johnson at Collins Radio Company.
Any filter realisable in electrical theory can, in principle, also be realised as a mechanical filter.
The ever continuing pursuit for high-precision and low power consumption micro and nano electro-mechanical systems (MEMS and NEMS) actuators, sensors and mechanical filter applications has resulted in increasing attention on resonators used in these devices [1].
Therefore, a system-frequency mechanical filter was designed and installed in the generator-and-rectifier section of the turbine set.
Some of the metals that have been used for mechanical filter resonators and their Q are shown in the table.
