A Comparative study of common objective functions based on modal parameters in structural damage detection

Subject Areas : Modal Analysis

Ehsan Jamshidi ¹ (مدیر گروه مکانیک جامدات و طراحی کاربردی، عضو هیات علمی)
Bahram Jamshidi ² (Department of Mechanical Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran)
Fatemeh Taghi Khaki ³ (Department of Mechanical Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran)
Alireza Arghavan ⁴ (Strategic Center for Energy and Sustainable Development, Semnan Branch, Islamic Azad University, Semnan, Iran)

Received: 2016-07-21 Accepted : 2016-07-21 Published : 2016-11-21

Keywords: Mode Shape, Natural frequency, Cantilever beam, Objective function, Damage Detection, Modal parameters,

Abstract :

Choosing appropriate objective function is necessary for detection of damage location and severity. To this end, objective functions based on modal parameters such as mode shapes and natural frequencies are combined with other objective functions capable to detect damage location. Then the location and severity of damage is obtained using optimization techniques. In this paper a cantilever beam is simulated numerically in MATLAB software using finite element method and then single and multi-objective genetic algorithms with different objective functions based on modal parameters are used to detect damage location and severity. To compare different objective functions, the effect of coordinate incompleteness, frequency range of interest and also environmental noise on the obtained results is studied.