i did some work with reactive suspension,, it worked by passing the fluid through a magnetic field,, whic varied the viscocity of the fluid,,
originaly the all the fluids viscocity was changed but this needed a lot of power ,, but later just the fluid passing through the needle valve and shim stack was altered,
to make the system work at least a sensor reading damper movement was required, then you needed a magic “black box” and a battery to power the whole lot,
but if you wanted an on the fly adjustable damper it was the way to go,, you could set up a number of damper curves then select them via a multi postion switch
one of the biggest current uses is in tractor seats
sorry must have hit the ramble button