Iterative modal strain energy method for damage severity estimation using frequency measurements

作者：Wang Shuqing^*

来源：Structural Control & Health Monitoring, 2013, 20(2): 110-120.

DOI：10.1002/stc.495

• damage assessment
• strain energy
• modal analysis
• modal frequency
• damage detection

A damage severity estimation method, named as iterative modal strain energy (IMSE) method, is developed to quantify the damage magnitude using the frequency measurements. Although all existing damage quantification methods that utilize modal strain energy are either employing mode shapes from the damage structure or under/overestimating the damage severity, the IMSE method is able to estimate the severity accurately, requiring only a few amount of identified modal frequencies from the damaged structure. To demonstrate the capabilities of the developed damage severity estimation algorithm, numerical studies are conducted of a clamped-free beam based on data generated from finite element models. Both noise-free and noise-polluted cases are considered. Furthermore, experimental data from a tested clamped-free beam are utilized to validate the IMSE method. The results demonstrate that the proposed algorithm is capable of quantifying the damage extent accurately.

• 出版日期2013-2
• 单位中国海洋大学