扩变约束阻尼复合结构设计与试验研究
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摘要
在典型的约束阻尼结构中引入大厚度高剪切模量扩变层可提高减振效果,且一定范围内扩变层厚度越大,结构中的阻尼层振动过程中的剪切变形越大,减振效果越好。但厚度超过一定限度后,大厚度高剪切模量扩变层的引入又会影响约束阻尼结构整体弯曲变形,从而对减振产生不利影响。在本研究中,采用一种高剪切模量的硬质材料作为约束阻尼结构的扩变层,通过对扩变层开槽(镂空设计),可在较大厚度、较大剪切模量的设计下保证整体结构的弯曲变形,实现了较好的减振性能设计。设计了6种不同约束阻尼复合结构,以10 mm厚钢板为减振对象,采用模态应变能仿真计算法对敷设6种不同约束阻尼复合结构构件分别进行了模态和振动频响特性分析,并制备了相应的300 mm×300 mm规格小样,完成了减振试验验证。
Introducing large thickness and high shear modulus stand-off layer to the usual passive damping structure can get better damping effect. And within a certain height range,the larger the thickness of the stand-off layer,the lager the shear deformation of the damping rubber layer,which will enhance the vibration reduction. However,the excessive thickness and high shear modulus of the stand-off layer will reduce the deformation of the whole passive damping materials,which will have adverse effect on the damping effect. In this study,a kind of high shear modulus hard material was used as the stand of layer,which had been slotted with different structures. With this design,bending deformation of the whole passive damping materials was ensured with large thickness and high shear modulus of the stand-off layer. 10 mm thick steel plate was used as the damping processing object,six kinds of different passive damping structure were designed,the effects of different slotted designs of stand-off layer on vibration reduction were discussed. The damping effect was calculated by using the general finite element software and the actual measurement carried out and discussed.
Introducing large thickness and high shear modulus stand-off layer to the usual passive damping structure can get better damping effect. And within a certain height range,the larger the thickness of the stand-off layer,the lager the shear deformation of the damping rubber layer,which will enhance the vibration reduction. However,the excessive thickness and high shear modulus of the stand-off layer will reduce the deformation of the whole passive damping materials,which will have adverse effect on the damping effect. In this study,a kind of high shear modulus hard material was used as the stand of layer,which had been slotted with different structures. With this design,bending deformation of the whole passive damping materials was ensured with large thickness and high shear modulus of the stand-off layer. 10 mm thick steel plate was used as the damping processing object,six kinds of different passive damping structure were designed,the effects of different slotted designs of stand-off layer on vibration reduction were discussed. The damping effect was calculated by using the general finite element software and the actual measurement carried out and discussed.
引文
[1]常冠军.粘弹性阻尼材料[M].北京:国防工业出版社,2012:281—282.
[2]孙庆鸿,张启军,姚慧珠.振动与噪声的阻尼控制[M].北京:机械工业出版社,1992:132—144.
[3] Huang P H Y,Reinhall P G,Shen I Y,et al. Use of microcellular foam materials in constrained layer damping treatments[J]. Cellular Polymers,2001,20(2):101—114.
[4] CHAUDRY A H. Passive stand-off layer damping treatment:theory and experiments[D]. Maryland:University of Maryland,2006:1—10.
[5]丁亮,林国兴,张明霞.含扩变层约束阻尼复合结构性能优化[J].材料开发与应用. 2017,32(4):113—121.
[2]孙庆鸿,张启军,姚慧珠.振动与噪声的阻尼控制[M].北京:机械工业出版社,1992:132—144.
[3] Huang P H Y,Reinhall P G,Shen I Y,et al. Use of microcellular foam materials in constrained layer damping treatments[J]. Cellular Polymers,2001,20(2):101—114.
[4] CHAUDRY A H. Passive stand-off layer damping treatment:theory and experiments[D]. Maryland:University of Maryland,2006:1—10.
[5]丁亮,林国兴,张明霞.含扩变层约束阻尼复合结构性能优化[J].材料开发与应用. 2017,32(4):113—121.