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Damage localization using experimental modal parameters and topology optimization

机译：使用实验模态参数和拓扑优化进行损伤定位

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摘要

This work focuses on the development of a damage detection and localization tool using the topology optimization feature of MSC.Nastran. This approach is based on the correlation of a local stiffness loss and the change in modal parameters due to damages in structures. The loss in stiffness is accounted by the topology optimization approach for updating undamaged numerical models towards similar models with embedded damages. Hereby, only a mass penalization and the changes in experimentally obtained modal parameters are used as objectives. The theoretical background for the implementation of this method is derived and programmed in a Nastran input file and the general feasibility of the approach is validated numerically, as well as experimentally by updating a model of an experimentally tested composite laminate specimen. The damages have been introduced to the specimen by controlled low energy impacts and high quality vibration tests have been conducted on the specimen for different levels of damage. These supervised experiments allow to test the numerical diagnosis tool by comparing the result with both NDT technics and results of previous works (concerning shifts in modal parameters due to damage). Good results have finally been achieved for the localization of the damages by the topology optimization.
机译：这项工作着重于使用MSC.Nastran的拓扑优化功能开发损坏检测和定位工具。该方法基于局部刚度损失与由于结构损坏引起的模态参数变化的相关性。刚度的损失是由拓扑优化方法解决的，该方法用于将未损坏的数值模型更新为具有嵌入损伤的相似模型。因此，仅将质量惩罚和实验获得的模态参数的变化用作目标。在Nastran输入文件中导出并编程了此方法的理论背景，并对方法的一般可行性进行了数值验证，并通过更新经过实验测试的复合层压板样品的模型进行了实验验证。通过控制的低能量冲击将损伤引入到样品中，并针对不同程度的损伤对样品进行了高质量的振动测试。这些有监督的实验允许通过将结果与NDT技术和以前的工作结果进行比较（关于由于损坏而导致的模态参数变化）来测试数字诊断工具。最终，通过拓扑优化在损害的定位上取得了良好的结果。

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  • 来源
    《Mechanical systems and signal processing》 |2010年第3期|636-652|共17页
  • 作者

    Hanno Niemann; Joseph Morlier; Amir Shahdin; Yves Gourinat;

  • 作者单位

    Universite de Toulouse, Institut Superieur de l'Aeronatique et de l'Espace, Departement Mecanique des Structures et Materiaux, BP 54032, 10, Ave. Edouard Belin, 31055 Toulouse Cedex 4, France;

    Universite de Toulouse, Institut Superieur de l'Aeronatique et de l'Espace, Departement Mecanique des Structures et Materiaux, BP 54032, 10, Ave. Edouard Belin, 31055 Toulouse Cedex 4, France;

    Universite de Toulouse, Institut Superieur de l'Aeronatique et de l'Espace, Departement Mecanique des Structures et Materiaux, BP 54032, 10, Ave. Edouard Belin, 31055 Toulouse Cedex 4, France;

    Universite de Toulouse, Institut Superieur de l'Aeronatique et de l'Espace, Departement Mecanique des Structures et Materiaux, BP 54032, 10, Ave. Edouard Belin, 31055 Toulouse Cedex 4, France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    damage localization; topology optimization; modal analysis; structural health monitoring;

    机译：损害定位;拓扑优化;模态分析结构健康监测;

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