基于压缩耗能假设的黏弹性夹芯梁的横向振动

发布时间：2018-05-13 04:24

本文选题：梁的横向振动 + 压缩阻尼　；参考：《振动与冲击》2016年10期

【摘要】：建立了一种新的有限元模型用于研究三层黏弹夹芯梁的横向振动。该模型第一层为约束层,中间层为黏弹性层,第三层为基梁层。将约束层和基梁层视作欧拉-伯努利(Euler-Bernoulli)梁,假定黏弹性层承受横向拉压变形。拉压应变来源于约束层和基梁层的横向相对运动,并且黏弹性层的横向位移被假定为约束层和基梁层位移之间的线性插值。为了验证该有限元模型的有效性,将其与实验结果和几种解析模型进行了对比,结果证明该有限元模型对夹芯梁结构固有频率的预测具有良好的精度,但对损耗因子的预测精度上有待提高。
[Abstract]:A new finite element model is established to study the transverse vibration of a three layer viscoelastic sandwich beam. The first layer of the model is confined layer, the middle layer is viscoelastic layer, and the third layer is foundation beam layer. The confined layer and the foundation beam layer are regarded as Euler-Bernoulli beam of Euler-Bernoulli, and the viscoelastic layer is assumed to be subjected to transverse tension and compression deformation. The strain of tension and compression originates from the lateral relative motion of the confined layer and the foundation beam layer, and the transverse displacement of the viscoelastic layer is assumed to be a linear interpolation between the displacement of the confined layer and the foundation beam layer. In order to verify the validity of the finite element model, it is compared with the experimental results and several analytical models. The results show that the finite element model has good accuracy in predicting the natural frequencies of sandwich beam structures. However, the prediction accuracy of loss factor needs to be improved.
【作者单位】：清华大学机械工程系;景德镇陶瓷学院机电学院;
【基金】：国家自然科学基金(11272170 51321092)
【分类号】：O327

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