Structural modal parameter identification based on 2D spectral analysis

被引：6
|
作者：
Yu, Xuewen [1 ]
Dan, Danhui [1 ,2 ,3 ]
机构：
[1] Tongji Univ, Sch Civil Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China
[2] Tongji Univ, Key Lab Performance Evolut, Control Engn Struct Minist Educ, 1239 Siping Rd, Shanghai 200092, Peoples R China
[3] Tongji Univ, Room 709,Bridge Bldg,1239 Siping Rd, Shanghai, Peoples R China
来源：
JOURNAL OF SOUND AND VIBRATION | 2023年 / 552卷
基金：
中国国家自然科学基金;
关键词：
Modal parameter identification; Frequency-damping 2D spectrum; Damping estimation; Vibration analysis; EIGENSYSTEM REALIZATION-ALGORITHM; BENCHMARK;
D O I：
10.1016/j.jsv.2023.117638
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
This paper proposes a 2D spectral analysis method based on damped Capon (dCAPON) and damped APES (dAPES) for structural modal parameter identification. The frequency and damping are estimated from the 2D dCAPON energy spectrum first, and then the amplitude (to construct the modal shape) corresponding to the frequency-damping point is calculated by the dAPES. The raw evenly-spaced computing grid is optimized into a banded hierarchically-refined one, greatly improving the computational efficiency. The performance of the proposed method is studied and it is investigated through the numerical and experimental data of a benchmark structure. The proposed method provides a simple and direct approach to estimating structural modal parameters, particularly for frequency and damping ratio.
引用
收藏
页数：17
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