Re: Small hammer-like actuator ideas


"Don Y" <nowhere@xxxxxxxx> wrote in message
news:j1vsde$7ru$1@xxxxxxxxxxxxxxxxxxxx
Hi Mike,

On 8/10/2011 1:11 PM, Mike Paff wrote:

Any suggestions as to other mechanisms I can look at for
inspiration?

Would it be possible to have a piezo mounted inside the chime,
tuned to vibrate the air at the resonate frequency of the chime?

<frown> Cheating!

And, I'm not yet convinced that the *air* vs. *tube* vibration
is the primary sound source.

Alternately, attach the piezo to the inside of the chime and
vibrate it directly.

Hmmm... also cheating. :>

The only piezoelectric transducers I have any experience with are
small and not capable of moving much mass (in particular, they
are used to raise "pins" in a Braille display... little mass,
little displacement).

Do more capable transducers exist? Or, do they end up getting too
large?

(also, what range of frequencies can they be operated over?)

Have you considered experimenting with longtitudinal excitation? Mounting
the drives at one end may be easier to convert into a visually pleasing
arrangement. By smart profiling of the tube ends, such as chamfering, you
may be able to excite some transverse excitation as well, the sound could be
'interesting'.

Unfortunately it's *very* expensive, but an exciter based on a Terfenol-D
rod may be an effective option.


.

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