A piston with adjustable resistance?

  1. Dear all,

    I have recently come across a project that requires me to find a device that does the following,

    A device that:

    1)generates "0" movement
    2)have a shaft that can be pulled or pushed over a distance
    3)I can induce a variable resistance force to the shaft (to counter external motion)

    Overall, it should looks like an actuator but the function is different- it can only resist motion and cannot generate motion on its own.

    Have you heard of any devices similar?
  2. jcsd
  3. Baluncore

    Baluncore 3,305
    Science Advisor

    An adjustable rate shock absorber as used for vehicle suspension.
  4. thanks man
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