Performance assessment of selected OMA techniques for dynamic identification of geotechnical systems and closely spaced structural modes

• Autorzy: Rainieri C. , Fabbrocino G.

Warianty tytułu

PL

Ocena sprawności wybranych typów operacyjnej analizy modalnej do identyfikacji bliskich postaci drgań w konstrukcjach geotechnicznych

• Języki publikacji: EN

Abstrakty

EN

Output-only modal analysis techniques and dynamic monitoring for vibration-based structural health assessment are primary tools for the investigation of the dynamic behavior even of very complex systems. An increasing attention towards these techniques and the opportunities they offer is rising also in the civil engineering field. In the present paper, the attention is focused on the possibility to enhance the knowledge about specific civil engineering systems using traditional and innovative operational modal analysis (OMA) methods. Two case studies are presented: one is focused on the assessment of the performance of the Second Order Blind Identification for output-only modal analysis in the presence of closely spaced modes. In the other, OMA is applied to the simulated dynamic response of an embedded retaining wall. Encouraging results are obtained, pointing out that OMA can be confidently applied also to the analysis of wall vibrations induced by propagating waves.

PL

Analiza modalna typu „output-only” i dynamiczne monitorowanie stanu konstrukcji na podstawie obserwacji drgań stanowią podstawowe narzędzia do badania dynamiki nawet bardzo złożonych układów. Wzrastające zainteresowanie takimi technikami i możliwościami, jakie oferują, odnotowuje się również w dziedzinie inżynierii lądowej. W prezentowanej pracy uwagę skupiono na możliwości pozyskiwania lepszej informacji o specyficznych układach konstrukcyjnych, poprzez zastosowanie tradycyjnych oraz innowacyjnych metod operacyjnej analizy modalnej (OMA). Przedstawiono dwa przypadki. W pierwszym skoncentrowano się na ocenie efektywności ślepej identyfikacji drugiego rzędu dla przypadku analizy modalnej typu „output-only” układu z bliskimi postaciami drgań własnych. W drugim technikę OMA zastosowano do zasymulowanej dopowiedzi dynamicznej ściany oporowej. Otrzymano zachęcające rezultaty, które wskazały analizę OMA jako godną zaufania przy badaniu drgań ściany wywołanych propagacją fal.

Słowa kluczowe

EN

operational modal analysis; Second Order Blind Identification; close modes; retaining wall; geotechnical structures

• Wydawca: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
• Czasopismo: Journal of Theoretical and Applied Mechanics
• Rocznik: 2011
• Tom: Vol. 49 nr 3
• Strony: 825--839
• Opis fizyczny: Bibliogr. 24 poz., rys., tab.

Twórcy

autor

Rainieri C.

autor

Fabbrocino G.

• University of Molise, Structural and Geotechnical Dynamics Laboratory StreGa, Campobasso, Italy,

Bibliografia

• 1. Allemang R.J., Brown D.L., 1982, A correlation coefficient for modal vector analysis, Proc. The 1st SEM International Modal Analysis Conference, Orlando, FL, USA
• 2. Ans B., H´erault J., Jutten C., 1985, Adaptive neural architectures: detection of primitives, COGNITIVA’85, 593-597
• 3. Belouchrani A., Abed-Meraim K., Cardoso J.F., Moulines E., 1997, A blind source separation technique using second-order statistics, IEEE Transactions on Signal Processing, 45, 434-444
• 4. Brincker R., Zhang L., Andersen P., 2000, Modal identification from ambient responses using frequency domain decomposition, Proc. The 18th SEM International Modal Analysis Conference, San Antonio, TX, USA
• 5. Cardoso J.F., Souloumiac A., 1996, Jacobi angles for simultaneous diagonalization, SIAM Journal of Matrix Analysis and Applications, 17, 161-164
• 6. Carvajal J.C., Ventura C.E., 2009, Identification of operational mode shapes of a soil deposit using a grid of microtremor measurements, Proc. The 3rd International Operational Modal Analysis Conference, Portonovo, Italy
• 7. Cunha A., Caetano E., 2005, From input-output to output-only modal identification of civil engineering structures, Proc. The 1st International Operational Modal Analysis Conference, Copenhagen, Denmark
• 8. Doebling S.W., Farrar C.R., Prime M.B., Shevitz D.W., 1996, Damage Identification and Health Monitoring of Structural and Mechanical Systems from Changes in their Vibration Characteristics: A Literature Review, Technical Report LA-13070-MS, UC-900, Los Alamos National Laboratory, New Mexico 87545, USA
• 9. Fabbrocino G., Laorenza C., Rainieri C., Santucci De Magistris F., 2009, Seismic monitoring of structural and geotechnical integrated systems, Materials Forum, 33, 404-419
• 10. Gentile C., 2005, Operational modal analysis and assessment of historical structures, Proc. The 1st International Operational Modal Analysis Conference, Copenhagen, Denmark
• 11. Kerschen G., Poncelet F., Golinval J.C., 2007, Physical interpretation of independent component analysis in structural dynamics, Mechanical Systems and Signal Processing, 21, 1561-1575
• 12. McNeill S.I., Zimmerman D.C., 2008, A framework for blind modal identification using joint approximate diagonalization, Mechanical Systems and Signal Processing, 22, 1526-1548
• 13. Mohanty P., 2005, Operational Modal Analysis in the presence of harmonic excitations, Ph.D. Thesis, Technische Universiteit Delft, The Netherlands
• 14. Peeters B., 2000, System identification and damage detection in civil engineering, Ph.D. Thesis, Katholieke Universiteit Leuven, Leuven, Belgium
• 15. Peeters B., Van der Auweraer H., Pauwels S., Debille J., 2005, An Overview of Operational Modal Analysis: Major Development and Issues, Proc. The 1st International Operational Modal Analysis Conference, Copenhagen, Denmark
• 16. Poncelet F., Kerschen G., Golinval J.C., Verhelst D., 2007, Outputonly modal analysis using blind source separation techniques, Mechanical Systems and Signal Processing, 21, 2335-2358
• 17. Rainieri C., 2008, Operational Modal Analysis for seismic protection of structures, Ph.D. Thesis, University of Naples “Federico II”, Naples, Italy
• 18. Rainieri C., Fabbrocino G., 2010, Automated output-only dynamic identification of civil engineering structures, Mechanical Systems and Signal Processing, 24, 678-695
• 19. Rainieri C., Fabbrocino G., Cosenza E., 2010, Integrated seismic early warning and structural health monitoring of critical civil infrastructures in seismically prone areas, Structural Health Monitoring – An International Journal, doi:10.1177/1475921710373296
• 20. Srikantha Phani A., Woodhouse J., 2007, Viscous damping identification in linear vibration, Journal of Sound and Vibration, 303, 475-500
• 21. Strogatz S.H., Abrams D.M., McRobie A., Eckhardt B., Ott E., 2005, Theoretical mechanics: crowd synchrony on the Millennium Bridge, Nature, 438 (7064)
• 22. Ventura C.E., Thibert K., 2007, Analysis of microtremor measurements by the frequency domain decomposition method, Proc. The 2nd International Operational Modal Analysis Conference, Copenhagen, Denmark
• 23. Zhang L., Brincker R., Andersen P., 2005, An Overview of Operational Modal Analysis: Major Development and Issues, Proc. The 1st International Operational Modal Analysis Conference, Copenhagen, Denmark
• 24. Zhou W., Chelidze D., 2007, Blind source separation based vibration mode identification, Mechanical Systems and Signal Processing, 21, 3072-3087