A piston with adjustable resistance?

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nomisme
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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?
 
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Baluncore said:
An adjustable rate shock absorber as used for vehicle suspension.

thanks man