Lets say you had a 100g mass bonded to a vibrator which applies a force up and down. It is known that at 100g this mass would oscillate at a maximum pk-pk acceleration of about 5G's, and at a frequency of 100Hz. What would increasing the mass do to the pk-pk acceleration (increase/decrease/nothihng)? What would it do to the frequency (increase/decrease/nothing)?
Below I have a few assumptions.
- The actuator is bonded to ground, and the mass is bonded to the top of the actuator
- The actuator only moves in the "up" and "down" direction
- The bonding is not elastic (no springiness and no dampening)
- The system's "outputs" are taken at "steady state" (not sure if that's the right term for it), basically the vibrator will be on for awhile.
What kind of problem do I have here? I don't think its a simple harmonic oscillator, or a damped simple harmonic oscillator since there is assumed to be no springs or dampers within the system.
So, to continue here is some quick research I've done so far. From what I could find online, "as the mass of a vibrating body increases, its frequency decreases"
Therefore, I can assume that the frequency will likely decrease if I use a 200g mass. Now, I'm a bit stuck on amplitude. Intuitively, I'm assuming that the amplitude should decrease, more mass is harder to push. But, since I'm assuming the vibrator will be on for awhile maybe enough energy will be added to make things work.
I haven't taken any vibrations classes yet so hopefully I'm making a bit of sense. Thanks for any help!