proof-mass actuator
force actuator

Выражение встречается в следующем контексте:

A proof-mass actuator (Fig.3.10) is an inertial actuator which is used in
various applications of vibration control. A reaction mass m is connected
to the support structure by a spring k, a damper c and a force actuator f
which can be either magnetic or hydraulic. In the electromagnetic actuator
discussed here, the force actuator consists of a moving-coil transducer of
constant T excited by a current generator i; the spring is achieved with
membranes which also guide the linear motion of the moving mass.

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