- #1

Hepth

Gold Member

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Suppose you have a simple harmonic oscillator :: WALL :: SPRING :: MASS

And assume its initial state is variational (Xo,Vo can be anything).

Now let's decide that we want to grab all of the energy out of the mass (as much as possible) and convert it to an electrical current.

I can think of two ways to do this:

1. The wall is a piezoelectric crystal. Set the Sqrt[k/m] to the natural freq of the crystal to maximize efficiency.

2. Magnetic fixed MASS, entire thing is inside a coil.

Can anyone think of any other ways of doing this? Of these two I think each has its application depending on the scale of the SHO. Both can be optimized for whatever the actual application, but I was trying to think of other methods.

I feel like they've done something similar somewhere (maybe using floatation devices to harvest energy from waves?) Though I was thinking on a smaller scale than that but it doesn't matter, I'm more interested in discussing general engineering applications to this.

It almost comes down to converting 1-D linear mechanical motion to an electric current. So assume no rotation is available (otherwise coiled motor/generator would be the solution). Thinking about 2: If there was a fluid inside the cavity that was ferromagnetic but with low viscosity, could the resistance of the fluid be overcome by the increasing of the electromagnetic permeability?

Thanks! Just thought I'd put this out there and see if anyone had any good ideas.

-Hepth