TIME-VARYING SHUNTED PIEZOELECTRIC PATCH ABSORBERS FOR BROADBAND VIBRATION CONTROL

This paper presents a simulation study concerning the implementation of an array of timevarying shunted piezoelectric patch absorbers on a thin plate, excited by a rain-on-the-roof white noise disturbance. Each absorber is formed by a piezoelectric patch connected to a shunt RLC-circuit whose inductance and resistance are continuously varied within given ranges so as to vary the fundamental resonance frequency and quality factor of the circuit within given ranges. In this way the shunted piezoelectric patch acts as a vibration absorber with sweeping resonance frequency and damping ratio set to control the resonant response of multiple flexural modes of the hosting plate. The principal properties of vibration control with a shunted piezoelectric patch transducer bonded on a thin plate are first revised. Also, simple expressions for the tuning of the resonance frequency and quality factor of the RLC circuit to minimise the response of a single flexural mode of the hosting plate are provided. The vibration control effects produced by a single or five sweeping shunted piezoelectric patch absorbers are then assessed considering the spectrum of the flexural kinetic energy of the plate between 0 and 1 kHz. For the configuration with five piezoelectric patch absorbers, two operation modes are considered: first, the frequency band of control is broken into five sub-bands with each patch operating in a single sub-band; second; all patches operate asynchronously in the whole frequency band of control.

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