多层波纹管等效阻尼的影响因素及其作用规律研究

发布时间：2018-05-20 16:22

本文选题：多层波纹管 + 粘弹性　；参考：《河南科技大学》2011年硕士论文

【摘要】：多层波纹管具有较强的位移补偿和减振降噪能力。利用合适的金属材料和粘弹性阻尼材料制作出多层波纹管的金属薄壳和阻尼夹层,这种多层波纹管具有很好的阻尼特性,可以更有效地降低管道的振动噪声,达到减振降噪的目的。本文以含夹层阻尼的多层波纹管为研究对象,经理论分析、数值仿真和实验验证,对多层波纹管等效阻尼的影响因素及其作用规律进行了研究。损耗因子是衡量阻尼材料耗散振动能量的主要指标之一,阻尼能越大则粘弹性阻尼材料的损耗因子就越大。利用ANSYS有限元分析软件建立含夹层阻尼的多层波纹管的有限元模型,采用APDL编程语言编写的模态应变能迭代法求解出多层波纹管的损耗因子。讨论分析了粘弹性阻尼特性、多层波纹管几何参数和结构构型对多层波纹管损耗因子的影响及其作用规律。分析结果表明:多层波纹管的损耗因子随粘弹性阻尼材料模量的增加先迅速增加,到达峰值后缓慢减小,随粘弹性阻尼材料厚度的增加先迅速减小后逐渐增加,而粘弹性阻尼材料密度的变化对多层波纹管的损耗因子没有影响;其它参数不变,多层波纹管的损耗因子随波高的增大而增大,随波距和直径的增大而减小,随壁厚的增加先迅速减小后逐渐增加,随波数和层数的增加而增大。所以为使多层波纹管具有理想的减振降噪能力,需要综合考虑粘弹性阻尼材料特性、多层波纹管几何参数和结构构型。对多层波纹管进行试验模态分析,经参数识别得出其损耗因子。将试验结果与仿真结果相比较,误差仅为6.25%,能满足工程实际应用要求,验证了仿真结果的正确性,说明采用模态应变能迭代法求解多层波纹管的损耗因子是可行的。本文为研究含夹层阻尼的多层波纹管的最佳阻尼处理方式提供了一定的参考依据,对含夹层阻尼的多层波纹管的设计制造和工程应用提供了一定的参考价值,对提高我国多层波纹管的减振降噪能力具有重要的现实意义。
[Abstract]:Multilayer corrugated tube has strong displacement compensation and vibration reduction and noise reduction ability. The thin metal shell and damping sandwich of multilayer bellows are made by using suitable metal material and viscoelastic damping material. The multilayer bellows have good damping characteristics and can effectively reduce the vibration and noise of pipes. The aim of reducing vibration and noise is achieved. In this paper, multilayer bellows with sandwich damping are taken as the research object. Through theoretical analysis, numerical simulation and experimental verification, the factors affecting the equivalent damping of multilayer bellows and their action law are studied. The loss factor is one of the main indexes to measure the dissipative vibration energy of damping materials. The larger the damping energy, the greater the loss factor of viscoelastic damping materials. The finite element model of multilayer bellows with sandwich damping is established by using ANSYS finite element analysis software. The loss factor of multilayer bellows is solved by using the modal strain energy iterative method compiled by APDL programming language. The effects of viscoelastic damping characteristics, geometric parameters and structural configuration of multilayer bellows on the loss factor of multilayer bellows are discussed and analyzed. The results show that the loss factor of multilayer corrugated tube increases rapidly with the increase of viscoelastic damping material modulus, and then decreases slowly with the increase of viscoelastic damping material thickness, and then increases gradually with the increase of viscoelastic damping material thickness. However, the density of viscoelastic damping material has no effect on the loss factor of multilayer bellows, while the loss factor of multilayer bellows increases with the increase of wave height and decreases with the increase of wave distance and diameter. With the increase of wall thickness, it decreases rapidly and then increases gradually, and increases with the increase of wavenumber and layer number. It is considered that the multilayer bellows have the ideal ability to reduce vibration and noise, and it is necessary to consider the characteristics of viscoelastic damping materials, geometric parameters and structural configuration of multilayer corrugated tubes. The experimental modal analysis of multilayer bellows is carried out and the loss factor is obtained by parameter identification. Comparing the experimental results with the simulation results, the error is only 6.25, which can meet the requirements of practical engineering application. The correctness of the simulation results is verified. It is proved that it is feasible to use the modal strain energy iterative method to solve the loss factor of multi-layer bellows. This paper provides a certain reference for the study of the optimal damping treatment of multi-layer bellows with sandwich damping, and provides a certain reference value for the design, manufacture and engineering application of multi-layer bellows with sandwich damping. It is of great practical significance to improve the ability of reducing vibration and noise of multilayer bellows in China.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH136

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