Originally Posted by denverd0n
I'm not so sure that vibration would be that much of a problem.
I think it would be a definite problem.
That heavy magnet and piston assembly travel back and forth at reciprocating engine speeds, with no countervailing motion to cancel it out. If it were run as a single cylinder, as in the drawing, it would pound like a jackhammer, gas spring or not. The lighter the entire unit, the worse it would react to these forces.
Look at an engine's crankshaft, there are heavy counterweights designed to cancel out the reciprocating forces of the piston, wrist pin and connecting rod on each crank throw at a chosen RPM. Without them, any engine would hammer itself to pieces.
This device is just an engineering prototype, with no attention paid to this problem at all.
It would require a lot of loc-tite and rubber mounts at least.
I didn't mention it before, but how is the desired frequency obtained? It is easy to govern an engine to run at an RPM that makes generating the desired frequency simple. Maintaining a steady freq output under varying loads, without any flywheel effect means a precision fuel injection and air metering computer has to do the job.
I like the gas turbine idea mentioned earlier, if one can be built to sip fuel.
Now that would be smooth