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Experimental identification of nonlinear joints using frequency domain techniques

Grant number: 19/06540-3
Support type:Scholarships abroad - Research Internship - Doctorate (Direct)
Effective date (Start): September 01, 2019
Effective date (End): August 31, 2020
Field of knowledge:Engineering - Mechanical Engineering - Mechanics of Solids
Principal Investigator:Samuel da Silva
Grantee:Rafael de Oliveira Teloli
Supervisor abroad: Chevalliergael
Home Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil
Local de pesquisa : Université de Franche-Comté (UFC), France  
Associated to the scholarship:16/21973-5 - New contribuitions on the analysis and identification of hysteretic mechanical systems: applications on Bouc-Wen oscillator, BP.DD


Assembled structures play a vital role in dynamic structural applications. However, the nonlinear interactions that occur in the joint interface are complex and challenging for modeling mainly because of the hysteretic effect usually generated in these spots. Therefore, some contributions still lacking in the literature to analyze the dynamic behavior and to predict the structural properties in these joints. Previous works of the candidate have shown some possible techniques to be applied for modeling hysteresis and bolted joints after a smoothing procedure to overcome some drawbacks. However, it is demanded an experimental prove yet. Hence, this research project intends to investigate the application of the harmonic balance method and the multidimensional Fourier transform of the Volterra kernel obtained through the harmonic probing technique to update parameters from experimental measurements of an assembled structure connected with bolted joints. Thus, a test-bench structure will be assembled during the research internship period to identify the nonlinear frequency response functions from the measurement data and then to extract the model parameters. The FEMTO-ST in Besan\c{c}on (France) is a recognized laboratory in modal analysis and nonlinear model updating in joints and assembled structures, and it is chosen to collaborate with our Brazilian group to investigate these experimental verifying of our proposal. The idea behind this project is to illustrate that the frequency domain methods can provide a useful and straightforward approach for nonlinear updating of common hysteretic models, for example, LuGre model, Iwan model or Bouc-Wen model, for assembled structures when the excitation assures a weak hysteretic force.