3
votes
Standing desk sway stabilization
It would be much simpler to just add mass to the underside of the desk. Increase its inertia so that you move (rather than the table) due to its reaction!
(From memory) aluminium has a density of ...
- 10.3k
2
votes
Accepted
Mechanism for fast vibration
100 Hz is what we call „bass“ in music. So a well proven device is called „speaker“, which comes in many flavors, and which is excited by electric signals, like sine, square, saw, noise, voice etc.
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- 181
2
votes
Mechanism for fast vibration
An electromagnetic buzzer is effectively a solenoid with the switch wired to the coil supply. Closing the primary power to the coil causes the solenoid to retract, which then opens the switch causing ...
- 6,940
2
votes
Accepted
Effect of bracing on a music instrument top - is FEM modal analysis enough to predict this?
What can (and what can't) modal analysis tell me about the transfer of periodic motion from the bridge (where the strings are attached) to the soundboard?
Very often in engineering, we find ourselves ...
- 2,646
2
votes
Effect of bracing on a music instrument top - is FEM modal analysis enough to predict this?
Bracing in the simplest way, say a large flat sheet extended reasonably long in both directions will increase the stiffness of the sheet and hence reduce its natural frequency. This will lead to ...
- 22.1k
2
votes
Accepted
Controlled oscillation of a piano string by electromagnetic, mechanical, or other means
What you describe has been on the market for over 40 years for electric guitar use; it is called an E-Bow. It contains a sense coil, a drive coil, a battery, and an amplifier circuit inside a case you ...
- 14.3k
1
vote
How to balance an irregular shape on a motor shaft?
The high school science method is to hang your object from two random points and mark the vertical plumb lines, the intersection of the two lines is the CG.
There are a vast number of different types ...
- 22.1k
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