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Structural vibration absorption in multilayered sandwich structures using negative stiffness nonlinear oscillators
Applied Acoustics ( IF 3.4 ) Pub Date : 2021-07-01 , DOI: 10.1016/j.apacoust.2021.108240
Han Meng , Xiuchang Huang , Yanyu Chen , Stephanos Theodossiades , Dimitrios Chronopoulos

We hereby report on the incorporation of negative stiffness oscillators realized through Euler buckled beams within vibrating multilayered sandwich structures. Such devices have been extensively investigated as single degree of freedom isolation mechanisms when mechanical grounding is available. It is worth exploring the influences of implementing such mechanisms within continuous multilayered vibrating structures given their interesting nonlinear vibration isolation characteristics. A numerical investigation is presented in this work with the computed performance being compared against the one of linear oscillators of equal mass and damping properties. Despite the fact that the negative stiffness nonlinear (NSN) oscillators were not properly optimized for the specific application due to the implied computational cost, they exhibited superior performance to their linear counterparts in a broadband sense. Considering the dependence of the linear resonators’ performance to manufacturing precision and narrowband excitation, the NSN concept is an excellent candidate for attenuating structural vibration across a wide spectrum.



中文翻译:

使用负刚度非线性振荡器的多层夹层结构中的结构振动吸收

我们在此报告了通过欧拉屈曲梁在振动多层夹层结构中实现的负刚度振荡器的结合。当机械接地可用时,此类设备已被广泛研究为单自由度隔离机制。鉴于其有趣的非线性隔振特性,值得探索在连续多层振动结构中实施此类机制的影响。在这项工作中提出了一项数值研究,将计算性能与具有相等质量和阻尼特性的线性振荡器中的一个进行比较。尽管负刚度非线性 (NSN) 振荡器由于隐含的计算成本而没有针对特定应用进行适当优化,在宽带意义上,它们表现出优于线性对应物的性能。考虑到线性谐振器的性能对制造精度和窄带激励的依赖性,NSN 概念是在宽频谱范围内衰减结构振动的绝佳候选者。

更新日期:2021-07-01
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