Assessments on Operational Modal Identification Refining of a Structural Element
This study deals with operational modal identification techniques area, presenting a group of experimental and computational approaches about refining of modal characteristics for structural parts during their dynamic exploitation regime. Hereby, it can be included both into the modal experimental/operational analysis domain—with application in dynamic state evaluation in order to provide essential information to vibration control measures, and into the structural health monitoring area—providing a feasible tool for compiling the referenced state and estimating the failure imminence. The analyses were developed based on the laboratory setup, taking into account a simple structural element with constant mechanical and geometrical characteristics. The theoretical approaches contain both analytical evaluations, and computational simulations with the help of the finite element method. The results comparison between the classical modal identification techniques and the proposed method reveals an improved capability of the last for modal characterization of a singular structural element within its dynamic evolution, also taking into account that the number of experimental measurements was constantly maintained. Future developments will take into consideration the applicability of these assessments for structural ensembles or variable characteristic elements.
- 3.S.K. Ciloglu, The impact of uncertainty in operational modal analysis for structural identification of constructed systems. A Thesis Submitted to the Drexel University in Partial Fulfillment of the Requirements for the Degree of Ph.D., Aug 2006Google Scholar
- 4.S.S. Rizo-Patron, J. Sirohi, in Operational modal analysis of a rotating cantilever beam using high-speed digital image correlation. 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, AIAA SciTech Forum, (AIAA 2016–1957). http://dx.doi.org/10.2514/6.2016-1957
- 5.B.E.P. da Silva, J.A. Pereira, Effect of harmonic components in an only output based modal analysis, in Proceedings of COBEM 2009—20th International Congress of Mechanical Engineering, Gramado, RS, Brazil 15–20 Nov 2009Google Scholar
- 6.R. Cantieni, Application of ambient vibration testing (operational modal analysis) in practice, http://rcidynamics.ch/site/downloads/
- 7.A. Agneni, R. Brincker, B. Coppotelli, (2004). On modal parameter estimates from ambient vibration tests, in Proceedings of the International Conference on Noise and Vibration Engineering: ISMA2004 Leuven, Belgium, 20–22 Sept 2004Google Scholar