Numerical study for evaluation of a vibration based damage index for effective damage detection

• Autorzy: Mehboob S. , Zaman Khan Q. U. , Ahmad S.

Identyfikatory

DOI

10.24425/bpasts.2020.134651

• Języki publikacji: EN

Abstrakty

EN

An improved damage detection index for a structural component is proposed, using eigenvalues estimated by means of frequency domain decomposition (FDD) and mode contribution subjected to ambient excitation. It is based on vibration measurements obtained from the acceleration data of a simple steel beam. Since the extraction of modal parameters involves practical limitations and, in general, it is difficult to obtain accurate results, therefore in the proposed method a derivative value of the time series acceleration response, termed modal contributing parameter (MCP), is used in combination with eigenfrequencies. The damage is indicated by element stiffness reduction (ESR). Different damage cases for various stiffness reduction values of 1% to 15% were investigated. Damage identification indices for every single damage and multiple damage cases were calculated. The modified MCP damage detection index showed a high index value, even for low-level damage with an element stiffness reduction of as low as 1% over the existing frequency drop and indices based on mode shape change. MCP index derived from the modal response, considering modal contributions to the entire structural response and eigenvalues for damage detection, improved overall sensitivity and reliability of index results. Both single and multiple cases of damage provided equally accurate results based on the MCP index value.

Słowa kluczowe

EN

damage identification; dynamic response; stiffness reduction; ambient excitation; index sensitivity

PL

identyfikacja uszkodzeń; odpowiedź dynamiczna; redukcja sztywności; pobudzenie otoczenia; czułość indeksu

• Wydawca: Polska Akademia Nauk, Wydział IV Nauk Technicznych
• Czasopismo: Bulletin of the Polish Academy of Sciences. Technical Sciences
• Rocznik: 2020
• Tom: Vol. 68, nr 6
• Strony: 1443--1456
• Opis fizyczny: Bibliogr. 61 poz., rys., tab.

Twórcy

autor

Mehboob S.

• Department of Civil Engineering, University of Engineering and Technology, Taxila, Pakistan

autor

Zaman Khan Q. U.

• Department of Civil Engineering, University of Engineering and Technology, Taxila, Pakistan

autor

Ahmad S.

• Pakistan Atomic Energy Commission (PAEC), Islamabad, Pakistan

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).