Targeted Energy Transfer Between a Model Flexible Wing and Nonlinear Energy Sink

摘要

Passive and nonlinear targeted energy transfers induced by resonant interactions between a single-degree-of-nfreedom nonlinear energy sink and a flexible swept wing are studied. With a series of ground-vibration tests, it isnshown that the nonlinear energy sink can be designed to quickly and efficiently absorb energy fromone ormorewingnmodes in a completely passive manner. Results indicate that it is feasible to use such a device to suppress or preventnaeroelastic instabilities like limit-cycle oscillations. The design of a compact nonlinear energy sink is introduced andnthe parameters of the device are examined experimentally, confirming that the required nonlinearizable stiffness isnachieved. Ground-vibration experiments performed on the wing’s nonlinear energy-sink system indicate thatntargeted energy transfer is achievable, resulting in a significant reduction in the second bendingmode response of thenwing. Furthermore, a finite elementmodel of the systemis developed to computationally reproduce the experiments,nproviding good agreement between the two. Finally, the finite element model is used to simulate the effects ofnincreased nonlinear energy-sink stiffness on the systemand to show the conditions underwhich the nonlinear energynsink will resonantly interact with higher-frequency wing modes.