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A piston with adjustable resistance?

  1. Feb 8, 2014 #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. Feb 8, 2014 #2


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    Science Advisor

    An adjustable rate shock absorber as used for vehicle suspension.
  4. Feb 8, 2014 #3
    thanks man
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