Tunable electromagnetic resonant shunt using pulse-width modulation

This article proposes a novel mean for tuning the natural frequency of an electromagnetic resonant shunt, using pulse-width modulation (PWM) circuit. It is used to modulate value capacitance and electrical shown be proportional command parameter PWM, duty cycle. An easy efficient strategy tune shunt in real time then proposed, thus obtaining low powered always stable vibration control device. The theory giving robust method predict dynamics system. Then, accurate multi-mode theoretical model tunable coupled elastic structure proposed experimentally validated on structure, case two different strategies. first one standard with both damping optimized reduce given resonance peak. second based as possible, which creates antiresonance “notch” type mechanical response at driving frequency. Both strategies are variation adaptation frequency, device, able by factor 40 level.