I have worked on vibratory feeders for razor blade handles and vibratory conveyors for tires (power plant) and clams (fishing boat). Probably a few others that I don't recall.

Walt

Tuned Mass Dampers.

> Passive vibration isolators use the resonance peak and the attenuation beyond that to achieve the desired net attenuation; the system is basically designed by designing the resonance frequency to be below the bulk of the vibration spectrum. I know this isn't quite what you had in mind.
> Shouldn't really mention this but the Las Vegas shooter used a form of resonance in the "bump stock" to make his semiautomatic rifle behave like an automatic
> There are other resonance-peaked systems, which I can't remember right now, that operate on resonance, since that minimizes the energy required

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Wave energy harvesters can maximize their energy production by tuning to resonance.

Helmholtz resonators, air intakes for cars in general, especially ones with switchable lengths, exhaust manifolds sometimes.

Cheers

Greg Locock


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Clocks. All clocks, from mechanical (pendulum and spring), quartz crystal, to atomic clocks.

Original Stewart Warner Industrial balancers use mechanical resonance to detect unbalance down to eccentricities .0002"
https://tnsmachines.com/wp-content/uploads/2016/01...

https://patents.google.com/patent/US2616288A/en

As of 2011 at least one of these machines was still in use by automotive legends.

Google Vortex Bladeless wind generator and you will find a lot of videos of funny looking vibrating vertical rod-like structures that are supposed to generate energy from wind.

https://vortexbladeless.com/download-green-paper/

The resonance is tuned to the vortex shedding frequency. Having maximum motion of the rod allows them to extract maximum energy from the vibration (energy extracted acts like damping).

Vortex shedding frequency changes with windspeed. Also the magnitude of oscillations increase with windspeed. So they arrange a permanent magnet in such a way that it stiffens the system as the magnitude of oscillation increases, which increases the resonant frequency that is supposed to allow natural frequency to follow close to the vortex shedding frequency (a passive tuning system to maintain resonance over a wider range of wind speeds). As an added benefit, the non-linear stiffening spring gives a resonance characteristic similar to a Duffing oscillatoro shaped like a shark fin... (the olive-colored one pointing to the right) which abruptly drops resonant frequency at high magnitudes... they take advantage of this (supposedly) to protect the machine from damage from excessive movement if the wind speed gets too high ... then you reach the right-most tip of the shark fin and then it detunes itself.

I should add the company has been in business a long time raising money from investors by showing their funny looking videos, but I'm not sure they have demonstrated very much performance yet.

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(2B)+(2B)' ?

Left off an obvious one, my electric toothbrush

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
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Superconducting particle accelerators use resonance for the niobium cavities in the cryomodules.

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Not making a decision is a decision in itself

Open one window in a moving car to annoy the driver or passengers with the deep Helmholtz throbbing.
Human vocal cords.