Abstract
This paper presents a novel mechanical attachment, i.e., nonlinear energy sink (NES), for suppressing the limit cycle oscillation (LCO) of an airfoil. The dynamic responses of a two-degree-of-freedom (2-DOF) airfoil coupled with an NES are studied with the harmonic balance method. Different structure parameters of the NES, i.e., mass ratio between the NES and airfoil, NES offset, NES damping, and nonlinear stiffness in the NES, are chosen for studying the effect of the LCO suppression on an aeroelastic system with a supercritical Hopf bifurcation or subcritical Hopf bifurcation, respectively. The results show that the structural parameters of the NES have different influence on the supercritical Hopf bifurcation system and the subcritical Hopf bifurcation system.
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Project supported by the National Natural Science Foundation of China (No. 11172199) and the Key Program of Tianjin Natural Science Foundation of China (No. 11JCZDJC25400)
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Guo, Hl., Chen, Ys. & Yang, Tz. Limit cycle oscillation suppression of 2-DOF airfoil using nonlinear energy sink. Appl. Math. Mech.-Engl. Ed. 34, 1277–1290 (2013). https://doi.org/10.1007/s10483-013-1744-8
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DOI: https://doi.org/10.1007/s10483-013-1744-8
Key words
- two-degree-of-freedom (2-DOF) airfoil
- flutter
- limit cycle oscillation (LCO) suppression
- nonlinear energy sink (NES)