1 May 1996 Foam-PVDF smart skin for active control of sound
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Abstract
This work is concerned with the development and testing of a foam-PVDF smart skin designed for active noise control. The smart skin is designed to reduce sound by the action of the passive absorption of the foam (which is effective at higher frequencies) and the active input of an embedded PVDF element driven by an oscillating electrical input (which is effective at lower frequencies). It is primarily developed to be used in an aircraft fuselage in order to reduce interior noise associated with turbulent boundary layer excitation. The device consists of cylindrically curved sections of PVDF piezoelectric film embedded in partially reticulated polyurethane acoustic foam. The active PVDF layer was configured to behave in a linear sense as well as to couple the predominantly in-plane strain due to the piezoelectric effect and the vertical motion that is needed to accelerate fluid particles and hence radiate sound away from the foam surface. For performance testing, the foam-PVDF element was mounted near the surface of an oscillating rigid piston mounted in a baffle in an anechoic chamber. A far-field and a near-field microphone were considered as an error sensor and compared in terms of their efficiency to control the far-field sound radiation. A feedforward LMS controller was used to minimize the error sensor signal under broadband excitation (0 - 1.6 kHz). The potential of the smart foam-PVDF skin for globally reducing sound radiation is demonstrated as more than 20 dB attenuation is obtained over the studied frequency band. The device thus has the potential of simultaneously controlling low and high frequency sound in a very thin compact arrangement.
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Chris R. Fuller, Cathy Guigou, C. A. Gentry, "Foam-PVDF smart skin for active control of sound", Proc. SPIE 2721, Smart Structures and Materials 1996: Industrial and Commercial Applications of Smart Structures Technologies, (1 May 1996); doi: 10.1117/12.239115; https://doi.org/10.1117/12.239115
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KEYWORDS
Foam

Ferroelectric polymers

Actuators

Control systems

Acoustics

Signal attenuation

Adhesives

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