Limit cycle oscillation suppression of 2-DOF airfoil using nonlinear energy sink

• 作 者: 郭虎伦 陈予恕 杨天智
• 机 构: School of Mechanical Engineering, Tianjin University,Tianjin Key Laboratory of Nonlinear Dynamics an
• 出 处: Applied Mathematics and Mechanics(English Edition)
• 发表日期: 2013年10期
• 关键词: 非线性能 2自由度 振荡抑制 极限周期 机翼 量水槽 霍普夫分岔 HOPF分岔 two-degree-of-freedom （2-DOF） airfoil fl

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.Diferent structure parameters of the NES,i.e.,mass ratio between the NES and airfoil,NES ofset,NES damping,and nonlinear stifness in the NES,are chosen for studying the efect 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 diferent influence on the supercritical Hopf bifurcation system and the subcritical Hopf bifurcation system.

This paper presents a novel mechanical attachment, ie, nonlinear energy sink (NES), for suppressing the limit cycle oscillation (LCO) of an airfoil. Dynamic load of a two-degree-of-freedom (2-DOF) airfoil coupled with an NES are studied with the harmonic balance method. Life structure parameters of the NES, ie, mass ratio between the NES and airfoil, NES ofset, NES damping, and nonlinear stifness in the NES, are chosen for studying the efect of the LCO suppression on an aeroelastic system with a supercritical Hopf bifurcation or subcritical Hopf bifurcation, respectively. These results show that the structural parameters of the NES have diferent influence on the supercritical Hopf bifurcation system and the subcritical Hopf bifurcation system.