Figure 1: Reversible exchange of energy between main system (red) and NES (black). |
Figure 2: Irreversible exchange of energy between main system (red) and NES (black). |
Unlike the traditional Tuned Mass Damper (TMD), the NES has no inherent natural frequency and is able to absorb energy over a wide range of frequencies. The efficiency of the NES, however, is extremely sensitive to small perturbations in design parameters or initial conditions. The sensitivity of the NES is shown in the figure below:
Figure 3: Example of discontinuity in efficiency metric for variations in NES design parameters. |
This research uses tailored classification and meta-modeling techniques to accurately model the behavior of the NES. These techniques are based on tools such as support vector machines (SVM) and Kriging, as well as a fundamental understanding of NES behavior. For further details see Boroson and Missoum (2014) and Boroson and Missoum (2015).
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References:
Vakakis, A. S., Gendelman, O. V., Bergman, L. A., McFarland, D.K., Kerschen, G., and Lee, Y. S., Nonlinear Targeted Energy Transfer in Mechanical and Structural Systems, Springer Science and Buisiness Media, vol 156: 2008.
, Reliability-based Design Optimization of Nonlinear Energy Sinks, Proceedings of the 11th World Congress of Structural and Multidisciplinary Optimisation (WCSMO-11), Sydney, Australia: 2015.
, Optimization Under Uncertainty of Nonlinear energy Sinks, Proceedings of the ASME International Design and Engineering Technical Conferences and Computers and Information in Engineering Conference, Buffalo, NY: American Society of Mechanical Engineers, 2014.
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