Structural health monitoring in nonlinear mechanical systems using Volterra models

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

Abstract

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)