Feedforward control of bending waves in frequency domain at structural junctions using an impedance formulation
Journal article, 2009

This paper presents an active impedance-matching technique for vibrating structures described by Euler–Bernoulli theory. Full 2×2 impedance matrices are included in the derivation of the reflection matrix of an arbitrary structural junction. This implies that the effects of both bending waves and bending near-fields are included. An active impedance load is introduced in order to match a discontinuity at the junction, i.e. to force the reflection matrix to zero. The impedance-matching technique is applied to two theoretical examples. First, maximum power transfer at a free end is investigated under the condition of incident bending wave and bending near-field; second, the approach is used to match the junction between an Euler–Bernoulli beam and a sandwich composite for an incident bending wave. The latter example proposes an active–passive damping configuration which employs active control to enclose all incident wave power in a dissipative sandwich-type structure. Results show that for this configuration, the active impedance load is responsible for the main part of the power absorption over a broad frequency range.

Author

Jonas Svensson

Chalmers, Civil and Environmental Engineering, Applied Acoustics, Vibroacoustics

Patrik Andersson

Chalmers, Civil and Environmental Engineering, Applied Acoustics, Vibroacoustics

Joachim Scheuren

Chalmers, Civil and Environmental Engineering, Applied Acoustics, Vibroacoustics

Wolfgang Kropp

Chalmers, Civil and Environmental Engineering, Applied Acoustics, Vibroacoustics

Journal of Sound and Vibration

0022-460X (ISSN) 1095-8568 (eISSN)

Vol. 323 3-5 555-573

Subject Categories

Other Materials Engineering

Fluid Mechanics and Acoustics

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Latest update

11/21/2018