各向异性PTFE密封件动密封性能的研究

发布时间：2018-05-10 11:51

本文选题：泄漏量 + 动密封性能评估模型　；参考：《哈尔滨工业大学》2016年硕士论文

【摘要】：本文旨在建立一种以泄漏量为指标、用于“O型圈+PTFE密封条”组合式密封的动密封性能评估模型,为电液摆动马达密封件的工程化设计提供理论依据。本文所建模型基于弹性流体润滑理论,与已有模型相比,引入PTFE各向异性、温度场和表面粗糙度,重点讨论PTFE各向异性、工况参数、材料力学性能和材料改性方法对模型的影响。完成MATLAB数值求解和ADINA热流固耦合仿真并分析得到数据的变化趋势,以实现数学模型和仿真模型的互相验证。首先,基于弹流润滑理论、综合考虑PTFE各向异性、温度场和表面粗糙度等影响因素,建立泄漏量的数学模型。该模型引入了温度场,可实现热流固耦合计算;同时,由于将PTFE的各向异性直接反映在油膜厚度计算公式中,因此能够更清晰地研究各向异性的影响。其次,分别求得考虑和未考虑各向异性时泄漏量等指标的数值解,并作出比较,进一步研究各向异性对数学模型的影响程度。此外,还讨论了工况条件和材料力学性能参数对泄漏量数学模型的影响,并做出理论分析。最后,在ADINA中建立热流固耦合模型,分析各不同参数对密封间隙处油膜厚度、油液压力和温度场的影响。为完成数学模型和仿真模型正确性的验证,从多方面比较了MATLAB数值解和ADINA仿真解的异同。
[Abstract]:The purpose of this paper is to establish a dynamic seal performance evaluation model for "O-ring PTFE sealing strip" combined seal, taking leakage quantity as the index, and to provide a theoretical basis for the engineering design of electro-hydraulic swing motor seal. The model is based on the theory of elastofluid lubrication. Compared with the existing model, the PTFE anisotropy, temperature field and surface roughness are introduced. The PTFE anisotropy and the operating parameters are discussed in detail. Effects of mechanical properties of materials and modification methods on the model. MATLAB numerical solution and ADINA heat fluid-solid coupling simulation are completed and the variation trend of the data is analyzed to realize the mutual verification of the mathematical model and the simulation model. Firstly, based on the theory of elastohydrodynamic lubrication, a mathematical model of leakage is established by considering the PTFE anisotropy, temperature field and surface roughness. This model introduces the temperature field to realize the heat fluid-solid coupling calculation, and because the anisotropy of PTFE is directly reflected in the oil film thickness calculation formula, the influence of anisotropy can be studied more clearly. Secondly, the numerical solutions of the leakage rate with and without anisotropy are obtained and compared to study the influence of anisotropy on the mathematical model. In addition, the effects of operating conditions and mechanical properties of materials on the mathematical model of leakage are discussed, and the theoretical analysis is made. Finally, a heat fluid-solid coupling model is established in ADINA to analyze the effects of different parameters on the oil film thickness, oil pressure and temperature field at the seal clearance. In order to verify the correctness of the mathematical model and the simulation model, the similarities and differences between the MATLAB numerical solution and the ADINA simulation solution are compared from many aspects.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH136

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