| 环境激励下结构模态参数的识别方法 |
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| 引用本文： | 赵毅,池碧波. 环境激励下结构模态参数的识别方法[J]. 国外建材科技, 2009, 30(3): 124-126 |
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| 作者姓名： | 赵毅 池碧波 |
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| 作者单位： | 1. 武汉理工大设计研究院,武汉,430070
2. 中南建筑设计院,武汉,430070 |
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| 摘 要： | 传统的模态参数识别方法同时需要已知激励和响应信号,但对实际建筑结构,激励施加存在困难。探讨了基于环境激励下的模态参数识别方法,提出采用随机减量法和ITD（Ibrahim Time Domain）法相结合来识别实际结构的模态参数。数值仿真算例识别结果表明,该方法不仅能准确的识别出结构的模态频率和阻尼比,也能准确的提取结构的模态振型,适合于环境激励下的结构工作模态参数识别。
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| 关 键 词： | 环境激励 随机减量法 ITD |
Identification Method of Structural Modal Parameter Under Ambient Excitation |
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| ZHAO Yi,CHI Bi-bo. Identification Method of Structural Modal Parameter Under Ambient Excitation[J]. Science and Technology of Overseas Building Materials, 2009, 30(3): 124-126 |
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| Authors: | ZHAO Yi CHI Bi-bo |
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| Affiliation: | ZHAO Yi , CHI Bi-bo (1. Design Institute of Wuhan University of Technology, Wuhan 430070, China; 2. Central-south Architectural Design institute, Wuhan 430070, China) |
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| Abstract: | For the traditional modal parameter identification method,exciting signal and response signal are necessary.But to excite a real structure and then get the response signal can t be realized.A new modal parameter identification method for structure under ambient excitation is proposed,which is using random decrement technique(RDT) and Ibrahim Time Domain(ITD) method.Numerical simulation results indicate that this new method could not only exactly identify the structure vibration frequency and damping ratio,but also the mode shape.So the method is suitable for output-only structural modal parameter identification. |
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| Keywords: | ITD |
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