[time-nuts] 5060A question
bruce.griffiths at xtra.co.nz
Tue Jan 8 02:56:14 EST 2008
Dave Carlson wrote:
> Since the source of the noise is the vibration of the Hot Wire Ionizer
> ribbon inside the CBT it will require using something other than pressure on
> the outer container to snuff it out. The outer steel of the CBT is rigid.
Which is why it transmits the sound so well.
Its not the pressure but the acoustic damping.
However material which has high acoustic damping also tends to be a good
thermal insulator, so care must be taken to avoid overheating components.
The idea isnt so much to stop the ribbon vibrating but attenuate the
transmission of the vibration to the surrounding structures and
ultimately the air.
A correctly sized and located acoustic resonator with appropriate
internal damping can help by absorbing the sound caused by the vibration.
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