Tunable electromagnetic resonant shunt using pulse-width modulation

A nonlinear piezoelectric shunt absorber with 2:1 internal resonance: experimental proof of concept

“…The order of magnitude of the second term in the above expression of V H1/2 , directly related to the electromechanical coupling, can be evaluated by using the following relations: (9), see [1]), θ i = k i ωi C pi m i (equation ( 5)) and √ L = 1/(ω e C pi ). After simplifications, one obtains:…”

“…[6]), possibly enhanced by negative capacitances [7,8]. They can also be used to create a frequency adaptive antiresonance to filter a monoharmonic excitation signal [9]. Among others, one can design a shunt with an electronic network as an electromechanical analog of the mechanical structure, to achieve broadband vibration damping (see e.g.…”

Subharmonic centrifugal pendulum vibration absorbers allowing a rotational mobility

“…the engine). Doing so, the antiresonance generated by the pendulums exists on every driveline components located after the CPVA [50], which allows to isolate the whole driveline from the torque fluctuations.…”

Self-adaptive piezoelectric vibration absorber with semi-passive tunable resonant shunts

“…This effect can be exploited with adaptive shunt circuits capable of tuning their electrical resonance frequencies by changing their parameters to attenuate structures excited with time-varying harmonic signals. This strategy, known as antiresonance locus, was recently exploited by Audeley et al [19,20] in an electromagnetic vibration absorber with adaptive resonant shunt controlled by an electronic chopper with pulse-width modulation. Despite being a well established strategy in the literature and already explored for electromagnetic vibration absorbers, the experimental application of the antiresonance locus strategy to absorbers based on piezoelectric transducers has not yet been investigated and proves to be challenging because the required reduction in the electrical damping reduces the robustness and stability margin of the structure, hindering the design of a suitable controller, and it also increases the energy flowing through the shunt circuit.…”