SEMINAR:Experimental Modal Analysis of Nonlinear Systems

Speaker:Dr. H. Nevzat Özgüven, METU

Title: Experimental Modal Analysis of Nonlinear Systems

Date/Time: 05 April 2023 / 13:40 - 14:30

Location: FENS G032 (Hybrid)

Zoom Link:https://sabanciuniv.zoom.us/j/97710552285

Abstract: Increasing competition to achieve higher performance in several industries, such as aerospace, led to a shift of emphasis toward the development of new methods for nonlinear system modeling, analysis, and identification. In this seminar, a recently developed experimental modal analysis method for nonlinear systems will be presented. The method includes a novel response-controlled step-sine testing (RCT) technique for nonlinear identification and constructing a modal model with response-dependent modal parameters. This approach provides an excellent tool for modeling nonlinear systems, and it is most useful when multiple nonlinearities coexist at different locations; for instance, in modeling a structure with many bolted connections. The method is capable of making testing even at unstable branches of frequency response functions (FRFs) when there is strong nonlinearity. The Harmonic Force Surface concept that helps us to plot the measured frequency responses with their unstable branches will also be discussed. The seminar will include the application of the method on various real structures varying from a missile to a miniature piezoelectric actuator.

Bio:Dr. H. Nevzat Özgüven is a Professor Emeritus at METU and ASME fellow.He received his B.S. and M.S. degrees from METU, and his Ph.D. from The University of Manchester. Joined the faculty of the Mechanical Engineering Department at METU. Spent two years as a Visiting Fulbright Professor at The Ohio State University, Columbus. Very recently, he spent one term at the Technical University of Munich (TUM) as a visiting professor. He held various administrative positions which include the CEO and the President of the Board of Directors of the Turkish Cement Industry for 3 years, Vice President of TÜBİTAK for more than 5 years, and Vice President (responsible for academic affairs) of METU for 8 years. Özgüven received several awards from TÜBİTAK, NATO, NASA, Fulbright, TTGV, TÜBA, METU and TUM. He supervised about 80 M.S. and Ph.D. students, published a book, and more than 200 papers. His detailed biography is given on his home page: https://blog.metu.edu.tr/ozguven/en/