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基于局部最大值同步压缩广义S变换识别结构瞬时频率

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为提升土木工程结构的瞬时频率识别精度,本文提出局部最大值同步压缩广义S变换方法.该方法首先对响应信号进行广义S变换;然后针对时频系数求取关于时间的偏导,进而估算信号的瞬时频率;最后采用局部最大值同步压缩算子来对时频系数进行重排,以此得到响应信号的瞬时频带.通过一组两层剪切框架模型的数值算例和一个七层钢筋混凝土剪力墙振动台试验验证该方法的有效性和可行性.研究结果表明,与既有的局部最大值同步压缩变换相比,本文方法不仅提升了瞬时频率的识别精度,而且改善了响应信号瞬时频带的时频聚集性.
Instantaneous Frequency Identification of Structures Based on Local Maximum Synchrosqueezing Generalized S-transform
In order to improve the identification accuracy of instantaneous frequency from civil engineering structures,a new method called local maximum synchrosqueezing generalized S-transform method(LMSSGST)is proposed.In the proposed method,the generalized S-transform is performed on the response signals of structure at first.Then,the instantaneous frequency can be estimated by taking partial derivative of the time frequency coefficients with respect to time.Finally,the local maximum synchrosqueezing operator is used to reassign the time-frequency coefficients.A numerical case of two-story frame structure and a test of seven-story reinforced concrete shear wall structure are used to verify the effectiveness and accuracy of the proposed method.The results demonstrate that that the LMSSGST method behaves better than local maximum synchrosqueezing transform.It not only enhances the accuracy of instantaneous frequency identification,but also improves the time-frequency energy concentration.

generalized S-transformlocal maximum synchrosqueezing transformtime frequency coefficientinstantaneous frequency

黄乌燕、陈奕涵、朱百顺

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漳州职业技术学院建筑工程学院,福建漳州 363000

广义S变换 局部最大值同步压缩变换 时频系数 瞬时频率

2024

南京工程学院学报(自然科学版)
南京工程学院

南京工程学院学报(自然科学版)

影响因子:0.185
ISSN:1672-2558
年,卷(期):2024.22(2)