基于响应传递比的桥梁结构工作模态参数识别

发布时间：2018-01-22 07:47

本文关键词： 模态分析传递比环境振动功率谱估计桥梁工程　出处：《工程力学》2017年11期 　论文类型：期刊论文

【摘要】：响应传递比在系统极点处与输入无关,并且等于振型比。基于这一独特性质,可以融合多个激励工况下的测试值构建传递比矩阵,并通过奇异值分解技术快速判断出系统的极点,进而根据传递比向量直接估算出振型向量。为了研究该方法在土木工程结构的工作模态参数识别中的应用,首先通过数值算例验证了响应传递比方法可以有效剔除谐波输入引起的虚假模态。此外,通过一环境激励下实桥的振动试验对该方法进行验证,并与有限元方法和随机子空间法结果进行了对比。结果表明,响应传递比方法能够有效地运用于环境激励下桥梁结构的模态参数识别。
[Abstract]:The response transfer ratio is independent of input at the pole of the system and is equal to the mode ratio. Based on this unique property, the transfer ratio matrix can be constructed by combining the test values under multiple excitation conditions. In order to study the application of this method to the identification of working modal parameters of civil engineering structures, the poles of the system are quickly determined by singular value decomposition (SVD) technology, and then the mode vector is estimated directly according to the transfer ratio vector. A numerical example is given to verify that the response transfer ratio method can effectively eliminate the false modes caused by harmonic input. In addition, the method is verified by a vibration test of a real bridge under an ambient excitation. Compared with the results of finite element method and stochastic subspace method, the results show that the response transfer ratio method can be effectively applied to the identification of modal parameters of bridge structures under ambient excitation.
【作者单位】：合肥工业大学土木与水利工程学院;
【基金】：国家重点研发计划项目(2016YFE0113400) 国家自然科学基金项目(51408176,51278163)
【分类号】：U446
【正文快照】： 模态参数识别是结构动力学领域的一个重要组成部分,也是进行结构状态评估、有限元模型修正、损伤识别和振动控制的基础和前提。目前常用的模态识别方法通常分为实验模态参数识别方法和工作模态参数识别方法[1]。实验模态参数识别方法需要测试结构的输入和输出信号[2 3]。而在

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