An active-skin may be defined as a continuous covering of the vibrating portions of the system with active, independently controllable actuation (piezoelectric) driven elements and is designed to affect control by altering the continuous structural radiation impedance rather than structural vibration. Active skin panels/foams merge the potential benefits of passive and active technologies, in the sense that: the “passive” peculiarities guarantee a good TL efficiency at medium and high frequencies and the “active” behavoiur may guarantee an “extra” broadband noise attenuation (feedback control) as well as a selective(variable) tone cancellation (feed-forward control). Noise associated to the electrical motor operations has been pointed out to be mainly due to the rotor/stator interaction and to be mainly propagated as a structureborne noise ; its frequency signature present harmonic peculiarities whose central frequency is directly correlated with the sinusoidal power supply spectra. These characteristics let assume an active control approach to be executable and potentially effective. Among the different active control implementation strategies, an “active skin” technologies has been preferred, as developed during the last years within our Departement. Experimental tests showed that an overall 15 dB reduction on emitted noise may be achieved in the whole frequency range; during these activities also interesting results concerning control algorithms architecture and implementation have been derived , whose results will be herein presented.

ACTIVE SKIN FOR NOISE CONTROL OF AN ELECTRICAL MOTOR FOR RAILWAY APPLICATIONS

VISCARDI, MASSIMO;LECCE, LEONARDO
2005

Abstract

An active-skin may be defined as a continuous covering of the vibrating portions of the system with active, independently controllable actuation (piezoelectric) driven elements and is designed to affect control by altering the continuous structural radiation impedance rather than structural vibration. Active skin panels/foams merge the potential benefits of passive and active technologies, in the sense that: the “passive” peculiarities guarantee a good TL efficiency at medium and high frequencies and the “active” behavoiur may guarantee an “extra” broadband noise attenuation (feedback control) as well as a selective(variable) tone cancellation (feed-forward control). Noise associated to the electrical motor operations has been pointed out to be mainly due to the rotor/stator interaction and to be mainly propagated as a structureborne noise ; its frequency signature present harmonic peculiarities whose central frequency is directly correlated with the sinusoidal power supply spectra. These characteristics let assume an active control approach to be executable and potentially effective. Among the different active control implementation strategies, an “active skin” technologies has been preferred, as developed during the last years within our Departement. Experimental tests showed that an overall 15 dB reduction on emitted noise may be achieved in the whole frequency range; during these activities also interesting results concerning control algorithms architecture and implementation have been derived , whose results will be herein presented.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/427653
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