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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Damping in beams using viscoelastic layers
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Damping in beams using viscoelastic layers

机译：使用粘弹性层阻尼梁

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摘要

Various types of sandwich beams with viscoelastic cores are currently used in aerospace and automotive industries, indicating the need for simple methods describing the dynamics of these complex structures. In order to understand the effectiveness of the sandwich structures, the dynamics of bare beam with unconstrained and constrained viscoelastic layers are investigated in this study. The viscoelastic layer is bonded uniformly on the beam. The effects of distributed viscoelastic layer treatment on the loss factors are studied. From the experiments it is observed that beams with constrained viscoelastic layer provide higher loss factors than those with unconstrained layer. The dynamics of sandwich beams is modeled using Euler and Bernoulli beam theory. Frequency-dependent Young's modulus and loss factors are considered in the model of viscoelastic material. The predicted Eigen frequencies obtained from the model are compared with the experimental results for two viscoelastic materials with aluminum base material. Frequency response functions are obtained from the finite element model and compared with experimental results for harmonic input. Reductions in vibration amplitudes for two viscoelastic materials (EAP-2 and EAP-43) are also compared. Based on the experimental results, it has been observed that the loss factors of EAP-43 are higher than that of EAP-2.
机译：当前在航空航天和汽车工业中使用各种类型的具有粘弹性芯的夹层梁，这表明需要简单的方法来描述这些复杂结构的动力学。为了理解夹层结构的有效性，本研究研究了具有无约束和受约束粘弹性层的裸梁动力学。粘弹性层均匀地粘结在梁上。研究了分布式粘弹性层处理对损耗因子的影响。从实验中可以看出，粘弹性层约束的梁比无约束层的梁具有更高的损耗因子。夹层梁的动力学使用欧拉和伯努利梁理论进行建模。在粘弹性材料模型中考虑了频率相关的杨氏模量和损耗因子。从模型获得的预测本征频率与两种铝基粘弹性材料的实验结果进行了比较。从有限元模型获得频率响应函数，并将其与谐波输入的实验结果进行比较。还比较了两种粘弹性材料（EAP-2和EAP-43）振动幅度的减小。根据实验结果，已经观察到EAP-43的损失因子高于EAP-2。

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