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首页> 外文学位 >Random decrement based method for parameter identification of wind-excited building models using acceleration responses.
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Random decrement based method for parameter identification of wind-excited building models using acceleration responses.

机译：基于随机减量的基于加速度响应的风激励建筑模型参数识别方法。

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摘要

This research addresses the parameter identification problem of a linear dynamic system from forced acceleration responses without any knowledge of input forces. Such a problem is attributed to the added effect of an applied force in its impulse acceleration response function. When using the random decrement technique for such acceleration responses, the random decrement signature of the acceleration response has the added effect resulting from the random decrement signature of the applied force. This result has greatly restricted the practical value and applicability of such a random decrement acceleration signature in the time domain identification.; The random decrement based method has been proposed in this study to provide a solution to the identification problem. The random decrement based method elaborates response data in the time domain and, then, frequency domain by combining the random decrement technique with the fast Fourier transform based algorithms. The theoretical derivation of the random decrement based method initially develops a new frequency response function approach for the acceleration responses, by means of a small modification of the traditional approach. The adoption of the modified frequency response function establishes a theoretical basis defined for the frequency response functions of the random decrement signatures, if the dominant vibration modes are significantly excited, well separated, and lightly damped.; Numerical and experimental simulations have been implemented to identify the modal parameters of building models from forced acceleration responses using the random decrement based method. The numerical simulation is based on various dynamic systems subjected separately to white noise excitations and fluctuating wind forces. The experimental simulation employs a five-story aeroelastic building model tested in a wind tunnel. These simulations are particularly critical to manifest the characteristics of the random decrement acceleration signatures when using the random decrement based method. The applicability of the random decrement based method has been verified by both numerical and experimental results. The performance, limitations, and difficulties encountered by the proposed random decrement based method are also discussed.
机译：这项研究从强制加速度响应解决线性动力学系统的参数识别问题，而无需任何输入力知识。这样的问题归因于施加力在其脉冲加速度响应函数中的附加作用。当对这种加速度响应使用随机减量技术时，加速度响应的随机减量特征具有由施加力的随机减量特征引起的附加效果。该结果极大地限制了这种随机递减加速度签名在时域识别中的实用价值和适用性。在这项研究中提出了基于随机减量的方法，以提供一种识别问题的解决方案。基于随机减量的方法通过将随机减量技术与基于快速傅里叶变换的算法相结合，详细说明了时域和频域中的响应数据。基于随机减量的方法的理论推导最初是通过对传统方法的微小修改来开发用于加速度响应的新的频率响应函数方法。如果主要振动模式被显着激发，很好地分离并且被轻微地阻尼，则采用修改后的频率响应函数将为随机减量信号的频率响应函数定义一个理论基础。使用基于随机减量的方法，已进行了数值和实验模拟，以从强制加速度响应中识别建筑模型的模态参数。数值模拟基于各种动力系统，这些动力系统分别受到白噪声激励和风力波动。实验模拟采用了在风洞中测试的五层气弹建筑模型。当使用基于随机减量的方法时，这些模拟对于体现随机减量加速度特征的特征尤其重要。数值和实验结果都证明了基于随机减量的方法的适用性。还讨论了所提出的基于随机减量的方法的性能，局限性和困难。

著录项

  • 作者

    Ku, Chiu Jen.;

  • 作者单位

    Colorado State University.;

  • 授予单位 Colorado State University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 254 p.
  • 总页数 254
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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