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Structural health monitoring in nonlinear mechanical systems using Volterra models

Grant number: 12/21195-1
Support type:Scholarships abroad - Research Internship - Master's degree
Effective date (Start): April 01, 2013
Effective date (End): September 30, 2013
Field of knowledge:Engineering - Mechanical Engineering
Principal Investigator:Samuel da Silva
Grantee:Sidney Bruce Shiki
Supervisor abroad: Gaëtan Kerschen
Home Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil
Local de pesquisa : Université de Liège (ULg), Belgium  
Associated to the scholarship:12/04757-6 - Structural health monitoring in nonlinear mechanical systems using Volterra models, BP.MS


Nonlinear tools for Structural Health Monitoring (SHM) are still not yet well developed. Thus, recent studies have shown the need to incorporate nonlinear techniques for SHM applications. In this sense, the present proposal aims the study and application of methods for damage detection and quantification in structures with local nonlinearities. Damage will be simulated in a benchmark mechanical system placed at University of Liège through the changes of nonlinear located parameters of the structure. Initially a nonlinear prediction will be applied using Volterra models expanded with Kautz filter with multiple poles for reaching to detect structural damages by comparing prediction errors with the values of a reference structure in healthy condition. If the damages are detected, a further procedure of nonlinear model updating based in the Volterra kernels will be applied to estimate the damage as modifications of the parameters of the motion equation of the mechanical system. The advantages and drawbacks of these approaches will be illustrated for the application in nonlinear mechanical structures. Results and conclusions about the application of the Volterra model in SHM expected to be published in conferences and journals of the area. (AU)