Feedforward control of bending waves in frequency domain at structural junctions using an impedance formulation
✍ Scribed by Jonas L. Svensson; Patrik B.U. Andersson; Joachim Scheuren; Wolfgang Kropp
- Book ID
- 104033685
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 706 KB
- Volume
- 323
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
This paper presents an active impedance-matching technique for vibrating structures described by Euler-Bernoulli theory. Full 2 Â 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.