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Characteristics extraction and numerical analysis of the rough surface macro-morphology

机译：粗糙表面宏观形态的特征提取与数值分析

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摘要

Purpose This paper aims to distinguish the relationship between the morphology characteristics of different scales and the contact performance of the mating surfaces. Also, an integrated method of the spectrum analysis and the wavelet transform is used to separate the morphology characteristics of the actual machined parts.Design/methodology/approach First, a three-dimensional (3D) surface profilometer is used to obtain the surface morphology data of the actual machined parts. Second, the morphology characteristics of different scales are realized by the wavelet analysis and the power spectral density. Third, the reverse modeling engineering is used to construct the 3D contact models for the macroscopic characteristics. Finally, the finite element method is used to analyze the contact stiffness and the contact area of the 3D contact model.Findings The contact area and the nominal contact pressure Pn have a nonlinear relationship in the whole compression process for the 3D contact model. The percentage of the total contact area of the macro-scale mating surface is about 70 per cent when the contact pressure Pn is in the range of 0-100 MPa, and the elastic contact area accounts for the vast majority. Meanwhile, when the contact pressure Pn is less than 10MPa, the influence factor (the relative error of contact stiffness) is larger than 50 per cent, so the surface macro-scale morphology has a weakening effect on the normal contact stiffness of the mating surfaces.Originality/value This paper provides an effective method for the multi-scale separation of the surface morphology and then lays a certain theoretical foundation for improving the surface quality of parts and the morphology design.
机译：目的本文旨在区分不同尺度的形态特征与配合面的接触性能之间的关系。此外，使用光谱分析和小波变换的集成方法来分离实际加工零件的形态特征。设计/方法/方法首先，使用三维（3D）表面轮廓仪获得表面形态数据实际加工零件的数量。其次，通过小波分析和功率谱密度来实现不同尺度的形貌特征。第三，逆向建模工程用于构建宏观特征的3D接触模型。最后，利用有限元方法对3D接触模型的接触刚度和接触面积进行了分析。发现在3D接触模型的整个压缩过程中，接触面积和名义接触压力Pn具有非线性关系。当接触压力Pn在0-100 MPa的范围内时，宏观配合表面的总接触面积的百分比约为70％，而弹性接触面积占绝大多数。同时，当接触压力Pn小于10MPa时，影响因素（接触刚度的相对误差）大于50％，因此表面宏观形态对配合表面的正常接触刚度有减弱的作用。 。原始性/价值本文为表面形态的多尺度分离提供了一种有效的方法，为提高零件的表面质量和形态设计奠定了一定的理论基础。

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  • 来源
    《Engineering Computations》 |2019年第3期|765-780|共16页
  • 作者

    Sun Qingchao; Mu Xiaokai; Yuan Bo; Xu Jiawen; Sun Wei;

  • 作者单位

    Dalian Univ Technol, Sch Mech Engn, Dalian, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Mech Engn, Dalian, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Mech Engn, Dalian, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Mech Engn, Dalian, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Mech Engn, Dalian, Liaoning, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Rough surface; Morphology decomposition; Numerical simulation; Contact analysis;

    机译：粗糙表面形态分解数值模拟接触分析;

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