27 April 2011 An adaptive-passive support for the absorption of tonal waves in structures
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High frequency vibration in flexible structures may be represented by travelling waves. Such waves carry energy and may travel large distances before being dissipated. These waves can be suppressed by the attachment of localised supports such as dampers etc. These devices can be designed to absorb the energy of such waves but must be tuned to the frequency of the incident wave in order to perform optimally. The paper concerns an adaptive-passive support for suppressing waves. The properties of the support self-tune so that the device remains optimally tuned. The device consists of an electro-magnetic shunt damper, attached either at and end or at some intermediate point. An adaptive algorithm for tuning the damper based on the minimising the reflection and/or transmission coefficients is proposed, these being estimated from measured vibrations. Numerical results are presented. Experimental results for a tunable damper attached to an end of a beam are reported, with a variable resistor in the shunt damper allowing the support to adapt.
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E. Rustighi, E. Rustighi, B. R. Mace, B. R. Mace, } "An adaptive-passive support for the absorption of tonal waves in structures", Proc. SPIE 7977, Active and Passive Smart Structures and Integrated Systems 2011, 79770B (27 April 2011); doi: 10.1117/12.879215; https://doi.org/10.1117/12.879215


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