Temperature- and frequency-dependent vibroacoustic response of aluminium extrusions damped with viscoelastic materials
Temperature- and frequency-dependent vibroacoustic response of aluminium extrusions damped with viscoelastic materials
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DOI：
10.1016/j.compstruct.2021.114148
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发表时间：
2021-05
影响因子：
6.3
通讯作者：
J. Zhang;Dan Yao;M. Shen;X. Sheng;Jiang-Qiang Li;Guo Shaoyun
中科院分区：
文献类型：
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作者：
J. Zhang;Dan Yao;M. Shen;X. Sheng;Jiang-Qiang Li;Guo Shaoyun
粘弹性材料常用作复合材料结构中噪声和振动控制的阻尼材料。然而，它们的有效阻尼温度范围通常非常窄，并且缺乏对它们的温度和频率依赖性的全面理解。因此，在这项研究中，我们分析的温度和频率依赖的振动声响应的铝挤压阻尼粘弹性材料。首先，制备了三种在不同温度下具有最佳阻尼性能的改性丁基橡胶。它们的玻璃化转变温度测定使用差示扫描量热法，和它们的温度和频率依赖的阻尼损耗因子和弹性模量，通过动态力学分析和使用时间-温度等效规则确定。随后，实际应用的粘弹性材料的高速列车车体，铝挤压件的传热特性进行了分析，使用有限元方法，并考虑温度和频率依赖的阻尼损耗因子和粘弹性材料的弹性模量的复合结构的振动声学行为进行了研究。最后，讨论了影响复合结构辐射声功率的粘弹性材料的关键参数，并对三种不同粘弹性材料的多层阻尼铝合金挤压件进行了分析。结果表明，为了在较宽的温度范围内控制复合材料结构的噪声和振动，不仅要拓宽粘弹性材料的温度范围，改善粘弹性材料的阻尼性能，而且要考虑温度和频率的变化，使阻尼损耗因子和弹性模量匹配。
Viscoelastic materials are commonly used as damping materials for noise and vibration control in composite structures. However, their effective damping temperature range is usually extremely narrow, and a comprehensive understanding of their temperature- and frequency-dependent properties is lacking. Therefore, in this study, we analyse the temperature- and frequency-dependent vibroacoustic response of aluminium extrusions damped with viscoelastic materials. First, three kinds of modified butyl rubbers with the best damping performance at different temperatures were fabricated. Their glass transition temperatures were measured using differential scanning calorimetry, and their temperature- and frequency-dependent damping loss factors and elastic moduli were determined through dynamic mechanical analyses and using the time–temperature equivalence rule. Subsequently, to practically apply the viscoelastic materials to a high-speed train carbody, the heat transfer characteristics of aluminium extrusions were analysed using the finite element method, and the vibroacoustic behaviours of the composite structure were investigated considering the temperature- and frequency-dependent damping loss factors and elastic moduli of the viscoelastic materials. Finally, the key parameters of the viscoelastic materials that affect the radiated sound power of the composite structure were discussed, and multilayer damped aluminium extrusions using three different viscoelastic materials were analysed. The results demonstrate that in order to control the noise and vibration of composite structures over a wide range of temperatures, not only the temperature range and damping performance of viscoelastic materials should be broadened and improved, respectively, but also the damping loss factor and elastic modulus should be matched considering temperature and frequency variations.