The application of modal filters for damage detection

Operational modal filter and its applications

“…There are several methods of modal filter application to damage detection [1][2][3][4][5]. The authors used the one described in [5].…”

“…In this section, only the calculation of reciprocal modal vectors according to Mendrok and Uhl [5] is reminded. The construction of the r th discrete modal filter, which corresponds to the r th pole of the transfer function H (ω), is based on the assumption that the modal residue R r pp is in the imaginary form [5]:…”

“…In recent years, several teams of researchers have developed the use of modal filters and have applied the results of such analyses in the tasks of vibration control, damage detection, and load identification [1][2][3][4][5][6][7][8][9][10][11][12][13]. Generally speaking, the modal filter extracts the modal coordinates of each individual mode from a system's output.…”

“…These latter groups of applications are the main interest of the authors. Modal filtration in the field of damage detection has many advantages including its autonomous operation (without the interaction of qualified staff), low computational cost, and low sensitivity to changes in external conditions [5]. However, the main drawback of this group of damage detection methods is its limited applicability to operational data.…”

Damage Localization and Monitoring of Load Changes in Truss Structures

“…The method was originally developed for damage detection (Mendrok and Uhl 2010a). But to present it properly it is first necessary to mention a few words about modal filtration.…”