Abstract
Frequency Change Ratio (FCR) based damage detection methodology for structural health monitoring (SHM) is analyzed in detail. The effectiveness of damage localization using FCR for some slight damage cases and worse ones are studied on an asymmetric planar truss numerically. Disadvantages of damage detection using FCR in practical application are found and the reasons for the cases are discussed. To conquer the disadvantages of FCR, an Improved Frequency Change Ratio (IFCR) based damage detection method which takes the changes of mode shapes into account is proposed. Verification is done in some damage cases and the results reveal that IFCR can identify the damage more efficiently. Noisy cases are considered to assess the robustness of IFCR and results indicate that the proposed method can work well when the noise is not severe.
Highlights
Structures may deteriorate and suffer from accumulated damage under the external loads during their service life
The Frequency Change Ratio (FCR) based damage detection method and its application on an asymmetric planar truss is described in detail and the defects of FCR and
The planar truss is applied to investigate the effects of the proposed Improved Frequency Change Ratio (IFCR) method numerically
Summary
Structures may deteriorate and suffer from accumulated damage under the external loads during their service life. Vibration based structural damage detection become an area of intense investigation and gain a lot of research improvement around these decades[1]. Structural damage will induces some changes in the modal parameters of the structure[2], such as the natural frequencies, mode shapes, damping ratios etc. Salawu[3] reviewed the methodologies using natural frequencies as diagnostic parameters for structural damage detection. The Frequency Change Ratio (FCR) based damage detection method and its application on an asymmetric planar truss is described in detail and the defects of FCR and. Some improvements are proposed to form an Improved Frequency Change Ratio(IFCR) damage detection method. The planar truss is applied to investigate the effects of the proposed IFCR method numerically
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