DETECTION OF CRACK LOCATION AND DEPTH IN A CANTILEVER BEAM BY VIBRATION MEASUREMENT AND ITS COMPARATIVE VALIDATION IN ANN AND GA

M.S. Mhaske, R.S. Shelke

Abstract: The presence of a crack is hazardous problem in the performance of many structures and it affects many of the vibration parameters like Natural frequency and mode shapes. Current research has focused on using different modal parameters like natural frequency, mode shape and damping to detect crack in beams. This work concentrates on the parameters like Deflection of a beam, Bending moment and behaviour of stresses. In this work, simulation is carried out by using analysis software ANSYS to find the change in natural frequencies as well as mode shapes for the cracked and uncracked beam. It is then verified by the results obtained from ANN controller and Genetic Algorithm. ANN is used to determine location of crack and its depth along with directions of propagation and Natural frequencies and corresponding mode shapes difference as initial input to calculate the variation and the vibration parameters. The output from ANN controller is corresponding depth and crack location. outputs from numerical analysis are compared with output from Experimentation and they have good resemblance to the results predicted by the ANN controller. Genetic algorithm is an evolutionary type of algorithm which generates the optimized solution to the problems. It is an iterative process to reach to the final solution. By using this, same results are found and related with the results of ANN. And finally the results are compared to find the most appropriate approach amongst the two methods.

Keywords: ANN, Crack, Depth, GA

DOI: https://doi.org/10.15623/ijret.2015.0410027