need to create 0 to 30 pounds linear force

i need something like a solenoid which can generate 0 to 30 pounds of
linear force. it needs to be easily controllable, i.e. have a
proportionate response to voltage or current as it will be used in a
closed loop system.

i think solenoids are ruled out because they dont generate force in a
nice proportionate way to voltage/current? am i wrong about that?

it also needs to be fast responding, i.e. 0 to 30 pounds in less than
100ms

hmm a solenoid does sound like the right thing..but why do i think
they are on/off?
.

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