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An Effective Inverse Procedure for Identifying DEM Parameters of Rock-Like Materials

机译：用于识别岩石状材料的DEM参数的有效逆程序

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摘要

This study aims to identify discrete element model parameters of rock-like materials. An inverse procedure is developed to determine the discrete element model parameters from experimental measurements. This involves the solution of an inverse problem through minimizing the misfit function which describes the error between numerical computation and experiment by an optimization procedure. In this procedure, the discrete element method is adopted as the numerical calculation method of the forward problem. The orthogonal experimental design is used for parameter sensitivity analysis. Besides, the approximation model with radial basis function is adopted instead of the actual calculation model to reduce the time of forward calculation. The ant-colony optimization algorithm is employed as the inverse operator. Therefore, the parameters of the discrete element model are optimized by this procedure. The three-point bending experiment with discrete element simulation is provided to verify the validity and accuracy of the inversion results. The results indicate that it can rapidly obtain the available and reliable model parameters just through a few sets of experimental data. As a result, this inverse procedure can be applied more widely to parameter identification of the discrete element model for brittle materials.
机译：本研究旨在识别岩状材料的离散元素模型参数。开发了一种反向程序以确定实验测量的离散元模型参数。这涉及通过最小化错量函数来解决逆问题，该函数通过优化过程描述数值计算和实验之间的误差。在该过程中，采用离散元素方法作为前向问题的数值计算方法。正交实验设计用于参数灵敏度分析。此外，采用径向基函数的近似模型而不是实际计算模型来减少前进计算的时间。蚁群优化算法用作逆转录器。因此，通过该过程优化了离散元件模型的参数。提供了具有离散元素模拟的三点弯曲实验，以验证反演结果的有效性和准确性。结果表明它可以通过几套实验数据迅速获得可用和可靠的模型参数。结果，该逆过程可以更广泛地应用于脆性材料的离散元件模型的参数识别。

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  • 来源
    《Mathematical Problems in Engineering》 |2019年第19期|6969546.1-6969546.13|共13页
  • 作者

    Chen Rui; Li Jisheng; Qian Yangqing; Peng Ruitao; Jiang Shengqiang; Hu Congfang; Zhao Ziheng;

  • 作者单位

    Xiangtan Univ Sch Mech Engn Xiangtan 411105 Hunan Peoples R China|Xiangtan Univ Engn Res Ctr Complex Track Proc Technol & Equipme Xiangtan 411105 Hunan Peoples R China;

    Xiangtan Univ Sch Mech Engn Xiangtan 411105 Hunan Peoples R China|Xiangtan Univ Engn Res Ctr Complex Track Proc Technol & Equipme Xiangtan 411105 Hunan Peoples R China;

    Xiangtan Univ Sch Mech Engn Xiangtan 411105 Hunan Peoples R China|Xiangtan Univ Engn Res Ctr Complex Track Proc Technol & Equipme Xiangtan 411105 Hunan Peoples R China;

    Xiangtan Univ Sch Mech Engn Xiangtan 411105 Hunan Peoples R China|Xiangtan Univ Engn Res Ctr Complex Track Proc Technol & Equipme Xiangtan 411105 Hunan Peoples R China;

    Xiangtan Univ Sch Mech Engn Xiangtan 411105 Hunan Peoples R China|Xiangtan Univ Engn Res Ctr Complex Track Proc Technol & Equipme Xiangtan 411105 Hunan Peoples R China;

    Xiangtan Univ Sch Mech Engn Xiangtan 411105 Hunan Peoples R China|Xiangtan Univ Engn Res Ctr Complex Track Proc Technol & Equipme Xiangtan 411105 Hunan Peoples R China;

    Xiangtan Univ Sch Mech Engn Xiangtan 411105 Hunan Peoples R China|Xiangtan Univ Engn Res Ctr Complex Track Proc Technol & Equipme Xiangtan 411105 Hunan Peoples R China;

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