The location of defects in structures from measurements of natural frequencies

TLDR

The principle can be combined with other mathematical techniques. A method of non‑destructively assessing the integrity of structures using measurements of the structural natural frequencies is described. The scheme uses finite‑element analysis, is applicable to any structure, and requires only one full analysis per structure type. Measurements at a single point can detect, locate, and quantify damage, and tests on an aluminium plate and a cross‑ply carbon‑fibre‑reinforced plastic plate show excellent agreement between predicted and actual damage sites while providing a useful indication of defect magnitude.

Abstract

A method of non-destructively assessing the integrity of structures using measurements of the structural natural frequencies is described. It is shown how measurements made at a single point in the structure can be used to detect, locate and quantify damage. The scheme presented uses finite-element analysis, since this method may be used on any structure. The principle may, however, be used in conjunction with other mathematical techniques. Only one full analysis is required for each type of structure. Results are presented from tests on an aluminium plate and a cross-ply carbon-fibre-reinforced plastic plate. Excellent agreement is shown between the predicted and actual damage sites and a useful indication of the magnitude of the defect is obtained.