http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Galvanetto, U. (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Influence of sharp stiffness variations in damage evaluation using POD and GSM
Thiene, M.,Galvanetto, U.,Surace, C. Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.14 No.4
Damage detection methods based on modal analysis have been widely studied in recent years. However the calculation of mode shapes in real structures can be time consuming and often requires dedicated software programmes. In the present paper the combined application of proper orthogonal decomposition and gapped smoothing method to structural damage detection is presented. The first is used to calculate the dynamic shapes of a damaged structural element using only the time response of the system while the second is used to derive a reference baseline to which compare the data coming from the damaged structure. Experimental verification is provided for a beam case while numerical analyses are conducted on plates. The introduction of a stiffener on a plate is investigated and a method to distinguish its influence from that of a defect is presented. Results highlight that the derivatives of the proper orthogonal modes are more effective damage indices than the modes themselves and that they can be used in damage detection when only data from the damaged structure are available. Furthermore the stiffened plate case shows how the simple use of the curvature is not sufficient when analysing complex components. The combined application of the two techniques provides a possible improvement in damage detection of typical aeronautical structures.
-
Influence of sharp stiffness variations in damage evaluation using POD and GSM
M. Thiene,U. Galvanetto,C. Surace 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.14 No.4
Damage detection methods based on modal analysis have been widely studied in recent years. However the calculation of mode shapes in real structures can be time consuming and often requiresdedicated software programmes. In the present paper the combined application of proper orthogonaldecomposition and gapped smoothing method to structural damage detection is presented. The first is usedto calculate the dynamic shapes of a damaged structural element using only the time response of the systemwhile the second is used to derive a reference baseline to which compare the data coming from the damagedstructure. Experimental verification is provided for a beam case while numerical analyses are conducted onplates. The introduction of a stiffener on a plate is investigated and a method to distinguish its influence fromthat of a defect is presented. Results highlight that the derivatives of the proper orthogonal modes are moreeffective damage indices than the modes themselves and that they can be used in damage detection whenonly data from the damaged structure are available. Furthermore the stiffened plate case shows how thesimple use of the curvature is not sufficient when analysing complex components. The combined applicationof the two techniques provides a possible improvement in damage detection of typical aeronauticalstructures.
-
-
Marco N. Coccon,송준호,옥승용,Ugo Galvanetto 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.6
The reliability analysis of offshore structures, as conceived by current design practice, is typically carried out at the component level with an implicit assumption that the structural system will be safe as long as all its members are safe according to the corresponding limit state equations. However, it is widely accepted that a more general and rigorous approach to the risk assessment of offshore structures based on system reliability analysis is needed, in which the reliability of a structure is estimated with respect to the system-level failure caused by potential failure modes consisting of component failures with their statistical dependence considered. To this end, the merits of a new risk assessment framework, originally developed for truss and frame structures, are investigated in this paper in view of an extensive application of this method to the offshore structural systems. The main advantage of the proposed method is that the identification process of dominant failure modes is decoupled from the evaluation process of the probabilities of failure modes and the system failure event. The identification phase consists of a multi-point parallel search employing a genetic algorithm, and it is followed by the evaluation phase, which performs a multi-scale matrix-based system reliability analysis where the statistical dependence among both components and failure modes is fully considered. In order to demonstrate the applicability of the proposed method to the offshore field, the problem of a jacket platform under an extreme sea state is considered, in which the uncertainties are assumed both in the wave and hydrodynamic models and in the material properties of the structural members. The computational efficiency and accuracy of the proposed approach are successfully demonstrated through comparison with Monte Carlo simulations.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
