Passive self-tuning inductor for piezoelectric shunt damping considering temperature variations

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Effect of temperature on the tuning of a piezoelectric resonant shunt composed of variable inductance or variable capacitance

International audienceThe piezoelectric resonant shunt is an electromechanical device that can significantly damp mechanical vibrations if it is finely tuned. However, temperature may influence the electrical components of the shunt and the mechanical parameters of the vibrating structure, and deteriorate the damping performance as a consequence. The objective of this work is to describe how inductive and capacitive components can be chosen so that the shunt tuning is maintained in the case of temperature variations. Two solutions of fully passive adaptive shunts are developed, tested and compared. The first solution includes a variable inductance. In contrast, the second solution includes a variable capacitance and intends on keeping the shunt inductance as constant as possible. Experiments validate the concept of a resonant shunt that autonomously adapts to temperature variations

Broadband vibration damping of a non-periodic plate by piezoelectric coupling to its electrical analogue

International audienceSeveral solutions for multimodal vibration damping of thin mechanical structures based on piezoelectric coupling have been developed over the years. Among them, piezoelectric network damping consists in using piezoelectric transducers to couple a structure to an electrical network, where the transferred electrical energy can be dissipated. In particular, the effectiveness of coupling rods, beams and plates to networks which are their electrical analogues has been proven. This work is the first step going towards more complex structures. After defining and experimentally validating a new electrical analogue of a simply-supported plate, the study is extended to the damping of a non-periodic plate. Experiments show that in this case, a broadband damping is achieved once the piezoelectric transducers are coupled to an adequate analogous network. A finite element model of the structure coupled to its analogous network is concurrently developed and validated

Plate electrical analogue for multimodal energy transfer

International audienceThis work presents the implementation of a plate electrical analogue and its validation by comparison between measurements and simulations. We also highlight the possible use of this network as an energy harvester