波纹管机械密封最佳参数匹配与振动特性分析

发布时间：2018-06-12 04:00

本文选题：S型波纹管膜片 + 有限元法　；参考：《新疆大学》2013年硕士论文

【摘要】：本文以DN100的S型波纹管膜片波形为研究背景,首先建立了由5～25组膜片组成的波纹管模型并进行了有限元分析,然后提取数值计算数据中的相关位移量和载荷条件详细分析了波纹管刚度与膜片组数之间的变化关系,最后用最小二乘法拟合建立了S型波纹管膜片的刚度计算约化模型。此外,本文另选DN55波纹管,不仅用S型波纹管膜片的刚度计算约化模型还用有限元计算法,进行了波纹管膜片组的刚度计算,反复对比了两种方法的计算结果,最终验证了本文提出的S型波纹管膜片的刚度计算约化模型的有效性,为波纹管刚度设计提供了简化计算公式。还在此基础上引入变量中径,建立新的S型波纹管膜片的刚度计算约化模型,如此以来,当波纹管膜片波形不变时,根据实际需要任意变化中径值与膜片组数就能得到波纹管的刚度值。根据有限元法计算得到的刚度值,代入到新疆大学前沿计算力学研究所自主研发的matching软件中,匹配出最佳阻尼,刚度,质量,得到优化前后的波纹管组件的振幅比值-转速曲线图。
[Abstract]:In this paper, based on the research background of DN100 s corrugated tube diaphragm waveform, a corrugated tube model consisting of 5 or 25 groups of bellows is established and analyzed by finite element method. Then, the relationship between the stiffness of corrugated tube and the number of diaphragm is analyzed in detail by extracting the relative displacement and load condition from the numerical calculation data. Finally, the reduction model of stiffness of S-shaped bellows is established by least square fitting. In addition, DN55 bellows are chosen in this paper. Not only the reduction model of the diaphragm of S type bellows but also the finite element method are used to calculate the stiffness of the bellows, and the results of the two methods are compared repeatedly. Finally, the effectiveness of the reduced stiffness model proposed in this paper is verified, which provides a simplified formula for the design of corrugated tube stiffness. On the basis of this, a new stiffness reduction model of S-type bellows diaphragm is established by introducing the variable middle diameter. In this way, when the waveform of bellows diaphragm is invariant, The stiffness of corrugated tube can be obtained by arbitrarily changing the diameter of the bellows and the number of the diaphragm. According to the stiffness value calculated by the finite element method, the matching software developed by the Institute of Advanced Computational Mechanics of Xinjiang University was used to match the optimum damping, stiffness and mass. The amplitude ratio of the bellows before and after optimization is obtained.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH136

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