AMORTISSEMENT D'UNE PIECE TOURNANTE PAR DISPOSITIF PIEZOELECTRIQUE DISSIPATIF PASSIF OU SEMI-PASSIF.

摘要

The turbomachine component comprises a structure (12) intended to be animated by a rotary motion, a piezoelectric transducer (10) partially drowned in the structure, and a closed dissipative electronic circuit embedded in the structure. The piezoelectric transducer is coupled to the dissipative electronic circuit, and is capable of converting mechanical energy generated by vibration of the structure into electrical energy for transmitting it to the circuit, which dissipates the transmitted electrical energy. The piezoelectric transducers are placed in several areas of the structure. The turbomachine component comprises a structure (12) intended to be animated by a rotary motion, a piezoelectric transducer (10) partially drowned in the structure, and a closed dissipative electronic circuit embedded in the structure. The piezoelectric transducer is coupled to the dissipative electronic circuit, and is capable of converting mechanical energy generated by vibration of the structure into electrical energy for transmitting it to the circuit, which dissipates the transmitted electrical energy. The piezoelectric transducers are placed in several areas of the structure. The structure comprises a composite material with a laminate of unidirectional folds and a fiber preform, and sub-structures. The piezoelectric transducer is placed between the folds, in the preform or on one of the interfaces between the sub-structures. The sub-structures comprise a laminate of unidirectional fold, a woven composite, a braided composite and a homogeneous material. The dissipative circuit comprises an electrical impedance consisting of a resistance of which the value R is chosen so that the damping by the dissipative circuit is maximum at a given resonant frequency of the structure. The electrical properties of the dissipative circuit vary with the rotation speed of the part, where the dissipative circuit is fed by electricity or recovery of mechanical energy. The electrical impedance further consists of an inductance value L, where the values R and L are chosen so that the resonant frequency of the assembly consisting of the dissipative circuit and the piezoelectric transducer is placed at a resonance frequency of the structure.