The paper is focused on the theoretical modeling, simulation, optimization and experimental investigation of a vibration electromagnetic inertial actuator based on linearized magnetic spring. The actuator has an extremely simple design and contains two differentially coupled magnetic springs, two coils and a magnetic housing. A magnetic shield and two magnetic rings, fixed on the moving magnets, ensure the force and linearity performance of the vibration actuator. Theoretical modeling and results from simulation and optimization of a reference model led to the construction of a prototype which was studied experimentally. Measured data show that the resonance frequency of the prototype is 42 Hz. This frequency can be adjusted in the domain 42÷32.3 Hz by extending the gap between the stationary magnets and the mobile magnetic assembly. The device, mounted on a mechanical structure, could generate vibration forces higher than 4 N in the frequency range 70 ÷ 500 Hz.

Keywords: Electromagnetic actuator, Magnetic spring, Vibration inertial actuator