Reciprocal motion transducer needed
Reciprocal motion transducer needed
(OP)
I need to economically exercise a solid state accelerometer (the Freescale MMA2260), in the lab while writing software for reading and analyzing the data. I would like to "shake" it, on axis, at two frequencies, 8Hz and 43Hz nominally (520rpm and 2600rpm respectively).
The mass of the accelerometer board is just an ounce or two.
I don't need much stroke, perhaps 1/4", at the frequencies indicated above.
So far, I am considering
A) mechanically converting rotary motion to reciprocal motion, as in a jigsaw mechanism, or
B) some sort of voice coil actuator (possibly a large speaker), which presumably could be driven directly with a DC amplifier.
I have electronic expertise but little to no mechanical expertise in this area.
Can anyone on the forum suggest a potential economical solution?
The mass of the accelerometer board is just an ounce or two.
I don't need much stroke, perhaps 1/4", at the frequencies indicated above.
So far, I am considering
A) mechanically converting rotary motion to reciprocal motion, as in a jigsaw mechanism, or
B) some sort of voice coil actuator (possibly a large speaker), which presumably could be driven directly with a DC amplifier.
I have electronic expertise but little to no mechanical expertise in this area.
Can anyone on the forum suggest a potential economical solution?





RE: Reciprocal motion transducer needed
Clamp the other end of the blade, e.g. in a vise.
Mount a relay's electromagnet close to the clamped end of the blade, e.g. to the vise's jaw.
Pulse the electromagnet or drive it with a sine wave.
Slide the blade into the vise until it resonates near the frequency you want.
Mike Halloran
Pembroke Pines, FL, USA
RE: Reciprocal motion transducer needed
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Reciprocal motion transducer needed
However, since the accelerometer has full-scale of 1.5 g, the maximum amplitude required for 43 Hz is only 0.0079 inches. And the max amplitude for 1.5 g at 8 Hz is only 0.23 inches
TTFN