Steel and nickel–iron alloys are common materials for mechanical filter components; nickel is sometimes used for the input and output couplings. Resonators in the filter made from these materials need to be machined to precisely adjust their resonance frequency prior to final assembly.
While the meaning of mechanical filter in this article is one that is used in an electromechanical role, it is perfectly possible to use a mechanical design to filter mechanical vibrations or sound waves (which are also essentially mechanical in nature) directly. For example, filtering of audio frequency response in the design of loudspeaker cabinets can be achieved with mechanical components. In the electrical application, in addition to mechanical components which correspond to their electrical counterparts, transducers are needed to convert between the mechanical and electrical domains. There are a wide variety of component forms and topologies for mechanical filters, a representative selection of which are presented in this article.
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