mechanical filters

[dr.power]

Hi guys,

I want to know if everybody here have worked by mechanical filters?
I want to know their performance as a high or low pass filter?
For instance as a high pass filter, Can I use them to filter out 39700Hz yet let a at least 40KHz and higher signals to pass through filter? A sharpness of say 30 to 40dB is good.

Thanks

 

[canadaelk]

What do you mean by mechanical filter? A tuning fork, for instance? What would your method of interfacing be: amp-transducer-filter-transducer-amp? Purpose?

In air-conditioning a damper is a filter

In engins oil is a filter (oil-filter. Sorry, my bad)

Having a sudden stop in a car is a filter (like in brick-wall)

Anything (well most anything) that resonates can be converted into a filter.

There used to be mechanical resonators, but they would be rather rare today

E

 

[atferrari]

Collins used them for their SSB equipment.

THey were very expensive and hard to get

 

[MrAl]

Hi,

Do you mean purely mechanical or electromechanical? Is the signal electrical or a mechanical vibration?

A crystal can be used as an electromechanical filter for example.

For a purely mechanical filter, attach a large mass to an object. The mass acts as a capacitance and can be analyzed in the same way as an electrical system. If you'd like more information about this, look up "spring mass damper" systems.