This paper presents a study on the design and use of a small scale proof mass electrodynamic actuator, with a low mounting resonance frequency, for velocity feedback control on a thin rectangular panel. A stability-performance formula is derived, which can be effectively used to assess the down scaling effects on the stability and control performance of the feedback loop. The design and tests of a velocity feedback loop with a prototype small scale proof mass actuator are also presented. When a feedback control having a gain margin of about 6dB is implemented, so that there is little control spillover effect around the fundamental resonance of the actuator, reductions of vibration between 5dB and 10dB in the frequency band between 80Hz and 250Hz have been measured at the control position.

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