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Analytical discussion on applicability of frequency domain decomposition method to systems excited by an impulse force

    Kahori Iiyama Affiliation
    ; Hitoshi Morikawa Affiliation
    ; Ping-Yu Chen Affiliation
    ; Kimitoshi Sakai Affiliation

Abstract

This paper focuses on the use of vibration measurements for the purpose of cost-effective performance evaluation for the safety management and maintenance of Japan’s social infrastructure like bridges. Since modal properties are often used to diagnose damage of structures by analysing their changes, various modal identification methods have been developed in the past few decades. Among these, the FDD method has still attractive attention because of its simplicity and practicality. It is also highly applicable to simultaneous observation at multiple points and even complex modes can be identified instantly. On the other hand, the applicability of this method to impact tests applied to evaluate the condition of structures has not been sufficiently discussed to date. In this study, we will clarify the applicability to impact tests by reconstructing the theoretical background of the FDD method. Furthermore, we will show from theory that when there is a correlation between inputs, higher-order singular values, which should be noted when applied to impact tests, will be affected. The conclusions obtained from the reconstruction of the theoretical background will be verified based on numerical experiments and actual observation records.

Keyword : frequency domain decomposition, modal identification, ambient vibration observation, impact force, cross-correlation inputs, bridge structure, numerical experiment

How to Cite
Iiyama, K., Morikawa, H., Chen, P.-Y., & Sakai, K. (2024). Analytical discussion on applicability of frequency domain decomposition method to systems excited by an impulse force. Journal of Civil Engineering and Management, 30(5), 452–464. https://doi.org/10.3846/jcem.2024.21347
Published in Issue
Jun 5, 2024
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