Doesn't EVERY conservative system have an integrator? 8)
Position is integral of velocity..
Velocity is integral of force/mass
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same with the angular systems..
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In plumbing a resevoir (my RO system has one with an air pressure bladder under my sink.. )
Maybe I should write a verilog-A model of that system?
In Solid-State systems.. The Capacitor has been the fundamental (analog) integrator.. as Inductors are harder to design well in silicon..
with Mems - you could use position and a spring to store
the energy..
Jonathan