where m is the levitating magnet mass, ce(z(t)) is the electrical
damping, cp is the parasitic viscous damping coefficient, FFric is parasitic
dry friction damping, Fmag(z(t)) is the the magnetic force, g is
gravity, y(t) is the displacement of the device frame due to external
forces, and z(t)is the displacement ofthe mass relative to the device
frame. In this equation, both viscous and dry friction (Coulomb)
damping are shown. In most literature, only viscous damping has