Frequency-based Damage Detection Method above Work Frequency, Experimental Data

Horacio Valadares Duarte¹; Lázaro Valentim Donadon²

¹ Departamento de Engenharia Mecânica da Universidade Federal de Minas Gerais; ² Departamento de Engenharia Mecância da Universidade Federal de Minas Gerais

doi:10.20906/CPS/CILAMCE2017-0283

Resumo

In this work the RSVD routine was used to identify damage in a structure using frequency response functions (FRFs) from a healthy and damaged aluminum plate with different failure levels. The RSVD was applied to FRFs in a high frequency range, above work frequency, as the main assumption is that small damages can be easily found by tracing the changes in high frequency modes. Though this assumption can be demonstrated theoretically, an actual measurement is usually difficult due to the environmental and measurement noise. This procedure can be an effective solution to those identification problems only if it proves to be practical and reliable. Some practical aspects will be discussed and actual data from different measurement positions, failure and noise level will be presented.

Palavras-chave: Singular value decomposition; Structural health monitoring; plate damage detection; damage detection above work frequency