摘要
高速飞行器机翼间隙会随着飞行热环境不断变化,针对非线性能量阱(nonlinear energy sink,NES)在机翼非线性颤振中对间隙大小较为敏感的问题,提出采用两个非线性能量阱的间隙非线性颤振抑制方法,增强NES在间隙尺寸方面的适应性,拓宽NES对宽范围间隙机翼非线性颤振的抑制能力。建立了具有双NES的间隙非线性机翼颤振动力学模型,对比分析了不同间隙情况下NES个数对间隙非线性导致的极限环振荡的抑制特性,结果表明,双NES相比于单NES具有更好的抑制效果,且对间隙的适应范围更大。分析了双NES安装位置、自振频率比、质量比等参数对极限环振荡抑制效果的影响,结果表明:并联式双NES相较于串联式双NES具有更好的抑制效果,且一个NES位于机翼前缘,另一NES位于机翼形心附近时抑制效果最佳;当NES的自振频率比超过2.0时,增大质量比(μ>0.025)并降低阻尼比(ζ<0.100),可以强化NES的抑制效果,此外,增大质量比与降低阻尼比能够拓宽维持较好效果的自振频率比范围。
The freeplay of the wings of high-speed aircraft will continuously change with the flight thermal environment.Aiming at the problem that the nonlinear energy sink(NES)is quite sensitive to the size of the freeplay in the nonlinear flutter of the wings,a method for suppressing the nonlinear flutter with freeplay by using two nonlinear energy sinks was proposed to enhance the adaptability of the NES in terms of the freeplay size and broaden the ability of the NES to suppress the nonlinear flutter of wings with a wide range of freeplay.A dynamic model of flutter of the wing with freeplay nonlinearity equipped with dual NESs was established.The suppression characteristics of the number of NESs on the limit cycle oscillation caused by freeplay nonlinearity under different freeplay conditions were compared and analyzed.The results show that the dual NESs have a better suppression effect than the single NES and have a larger adaptation range to the freeplay.The influence of parameters such as the installation positions of the dual NESs,the natural frequency ratio,and the mass ratio on the limit cycle oscillation suppression effect was analyzed.The results show that the parallel dual NESs have a better suppression effect than the series dual NESs,and the best suppression effect is achieved when one NES is located at the leading edge of the wing and the other is located near the centroid of the wing.When the natural frequency ratio of the NES exceeds 2.0,increasing the mass ratio(μ>0.025)and reducing the damping ratio(ζ<0.100)can enhance the suppression effect of the NES.Furthermore,increasing the mass ratio and decreasing the damping ratio can widen the effective operational range of natural frequency ratio.
作者
程广宇
钮耀斌
王中伟
CHENG Guangyu;NIU Yaobin;WANG Zhongwei(Advanced Propulsion Technology Laboratory,National University of Defense Technology,Changsha 410073,China)
出处
《振动与冲击》
北大核心
2025年第24期259-266,共8页
Journal of Vibration and Shock
基金
国家自然科学基金(52575161)。
关键词
非线性能量阱(NES)
间隙非线性
极限环振荡
颤振抑制
nonlinear energy sink(NES)
freeplay nonlinearity
limit cycle oscillation
flutter suppression
