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Online numerical simulation: A hybrid simulation method for incomplete boundary conditions

机译：在线数值模拟：不完整边界条件的混合模拟方法

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摘要

Hybrid simulation is a powerful and cost-effective simulation technique to evaluate structural dynamic performance. However, it is sometimes rather difficult to guarantee all the boundaries on the physical substructures, especially when the boundary conditions are very complex, due to limited laboratory resources. Lacking of boundary conditions is bound to change the stress state of the structure and eventually result in an inaccurate evaluation of structural performance. A model updating-based online numerical simulation method is proposed in this paper to tackle the problem of incomplete boundary conditions. In the proposed method, 2 sets of finite element models with the same constitutive model are set up for the overall analysis of the whole structure and the constitutive model parameter estimation of the physical substructure, respectively. The boundary conditions are naturally satisfied because the response is calculated from the overall structural model, and the accuracy is improved as the material constitutive parameters are updated. The effectiveness of the proposed method is validated via numerical simulations and actual hybrid tests on a RC frame structure, and the results show that the negative effect of incomplete boundary conditions is almost eliminated and the accuracy of hybrid simulation is very much improved.
机译：混合仿真是一种功能强大且经济高效的仿真技术，可用于评估结构动力性能。但是，有时由于物理实验室结构的有限性，很难保证物理子结构上的所有边界，特别是当边界条件非常复杂时。缺乏边界条件势必会改变结构的应力状态，并最终导致对结构性能的评估不准确。针对边界条件不完备的问题，提出了一种基于模型更新的在线数值模拟方法。在该方法中，分别建立了两组具有相同本构模型的有限元模型，用于整体结构的整体分析和物理子结构的本构模型参数估计。边界条件自然得到满足，因为根据整体结构模型计算了响应，并且随着材料本构参数的更新，精度也得到了提高。通过数值模拟和实际的混合试验对RC框架结构的有效性进行了验证，结果表明，消除了不完全边界条件的不利影响，大大提高了混合模拟的精度。

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  • 来源
    《Earthquake Engineering & Structural Dynamics》 |2018年第4期|889-905|共17页
  • 作者

    Wu Bin; Ning Xizhan; Xu Guoshan; Wang Zhen; Mei Zhu; Yang Ge;

  • 作者单位

    Harbin Inst Technol, Key Lab Struct Dynam Behav & Control, Minist Educ, Harbin, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Key Lab Struct Dynam Behav & Control, Minist Educ, Harbin, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Key Lab Struct Dynam Behav & Control, Minist Educ, Harbin, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Key Lab Struct Dynam Behav & Control, Minist Educ, Harbin, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Key Lab Struct Dynam Behav & Control, Minist Educ, Harbin, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Key Lab Struct Dynam Behav & Control, Minist Educ, Harbin, Heilongjiang, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    hybrid simulation; model updating; online numerical simulation; parameter estimation; unscented Kalman filter;

    机译：混合仿真;模型更新;在线数值仿真;参数估计;无味卡尔曼滤波器;

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