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 ...
Transistor's user avatar
  • 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. ...
MS-SPO's user avatar
  • 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 ...
fred_dot_u's user avatar
  • 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 ...
Daniel K's user avatar
  • 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 ...
kamran's user avatar
  • 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 ...
niels nielsen's user avatar
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 ...
kamran's user avatar
  • 22.1k

Only top scored, non community-wiki answers of a minimum length are eligible