熊春宝, 王猛, 连思达. 基于RDT-IVMD算法的大型结构模态频率和阻尼比识别[J]. 工程力学. DOI: 10.6052/j.issn.1000-4750.2023.02.0118
引用本文: 熊春宝, 王猛, 连思达. 基于RDT-IVMD算法的大型结构模态频率和阻尼比识别[J]. 工程力学. DOI: 10.6052/j.issn.1000-4750.2023.02.0118
XIONG Chun-bao, WANG Meng, LIAN Si-da. MODAL FREQUENCY AND DAMPING RATIO IDENTIFICATION OF LARGE-SCALE STRUCTURES BASED ON RDT-IVMD ALGORITHM[J]. Engineering Mechanics. DOI: 10.6052/j.issn.1000-4750.2023.02.0118
Citation: XIONG Chun-bao, WANG Meng, LIAN Si-da. MODAL FREQUENCY AND DAMPING RATIO IDENTIFICATION OF LARGE-SCALE STRUCTURES BASED ON RDT-IVMD ALGORITHM[J]. Engineering Mechanics. DOI: 10.6052/j.issn.1000-4750.2023.02.0118

基于RDT-IVMD算法的大型结构模态频率和阻尼比识别

MODAL FREQUENCY AND DAMPING RATIO IDENTIFICATION OF LARGE-SCALE STRUCTURES BASED ON RDT-IVMD ALGORITHM

  • 摘要: 为从传感器监测到的带噪信号中准确识别结构的模态参数,提出了随机减量技术(Random Decrement Technique,RDT)与改进的变分模态分解(Improved Variational Mode Decomposition,IVMD)相联合的算法。经仿真试验验证了IVMD在理论上更具优势,能够解决传统VMD算法的缺点。所提算法首先利用RDT从原始监测信号中直接获得带有噪声的自由衰减响应(Free Decay Response,FDR),而不对原始信号先降噪,提高了分析效率;然后,采用IVMD得到降噪的FDR;最后,基于降噪的FDR获得结构的模态频率和阻尼比。利用RDT-IVMD算法分别对超高层建筑的位移和悬索桥的加速度进行处理分析,结果表明RDT-IVMD能高效的精确识别两大型结构的频率和阻尼比,并经对比分析证明了该方法的可靠性与优越性,所得结果可为结构的监测与诊断研究提供依据。

     

    Abstract: In order to accurately identify the modal parameters of structures from noisy signals monitored by sensors, a combination algorithm of random decrement technique (RDT) and the improved variational mode decomposition (IVMD) was presented. The simulation results indicate that the IVMD has more advantages in theory and solves the shortcomings of the traditional VMD algorithm. Firstly, the proposed algorithm used RDT to obtain the free decay response (FDR) with noise directly from the original monitoring signal, without denoising the original signal first, which improves the analysis efficiency. Then, the denoised FDR was acquired by IVMD. Finally, the structural modal frequencies and damping ratios were obtained based on the denoised FDR. The RDT-IVMD algorithm is applied to analyze the displacement of a super-high-rise building and the acceleration of a suspension bridge, respectively. The results show that RDT-IVMD can efficiently and precisely detect frequencies and damping ratios of two large-scale structures, and the reliability and superiority of the method are proved by comparative analysis. The results can offer a basis for structural monitoring and diagnostic research.

     

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