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Damping Identification with Acceleration Measurements Based on Sensitivity Enhancement Method

机译：基于灵敏度增强方法的加速度测量阻尼识别

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摘要

The damping is important for forward and inverse structural dynamic analysis, and damping identification has become a hot issue in structural health monitoring recently. The dynamic responses of the structure can be measured in practice, and the structural parameter usually can be identified by inverse response sensitivity analysis. To reduce the measurement noise effect and enhance the effectiveness of the response sensitivity method, an enhanced sensitivity analysis method was proposed to identify the structural damping based on the Principal Component Analysis (PCA) method. The measured acceleration responses were analyzed by PCA method, and the updated analytical responses and the response sensitivities were projected into the subspace determined by the first-order principal component. The projection equations were adopted to identify the parameters of damping model. The proposed damping identification method was numerically validated with a planar truss structure at first, and then the experimental study was conducted with a steel planar frame structure. It shows that the proposed method is effective in identifying the parameters of damping model with better accuracy compared with the conventional acceleration response sensitivity method, and it is also robust to the sensor placement and measurement noise.
机译：阻尼对于正向和反向结构动力分析非常重要，并且阻尼识别已成为最近结构健康监测中的热门问题。可以在实践中测量结构的动力响应，通常可以通过逆响应敏感性分析来确定结构参数。为了降低测量噪声的影响并提高响应灵敏度法的有效性，提出了一种基于主成分分析（PCA）的增强灵敏度分析方法来识别结构阻尼。用PCA方法对测得的加速度响应进行分析，并将更新后的分析响应和响应灵敏度投影到由一阶主成分确定的子空间中。采用投影方程确定阻尼模型的参数。首先通过平面桁架结构对所提出的阻尼识别方法进行了数值验证，然后对钢框架结构进行了试验研究。结果表明，与传统的加速度响应灵敏度方法相比，该方法能够有效地识别阻尼模型参数，精度更高，对传感器的放置和测量噪声也具有较强的鲁棒性。

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  • 来源
    《Shock and vibration》 |2018年第5期|6476783.1-6476783.16|共16页
  • 作者

    Wang Xusheng; Liu Kun; Liu Hongbo; He Yuhan;

  • 作者单位

    Univ Jinan, Sch Civil Engn & Architecture, Jinan 250022, Shandong, Peoples R China;

    Heilongjiang Univ, Sch Civil Engn & Architecture, Harbin 150080, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Minist Ind & Informat Technol, Key Lab Smart Prevent & Mitigat Civil Engn Disast, Harbin 150090, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Minist Educ, Key Lab Struct Dynam Behav & Control, Harbin 150090, Heilongjiang, 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
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