CRACK DETERMINATION IN PROPELLER SHAFT USING NATURAL FREQUENCY

Mechanical Engineering

Present work gives an overview of cracks determination in material using natural frequency method and its application to current engineering problems. In this technique, comparison between actual natural frequency (without crack) and frequency due to crack propagation is made using Euler Beam theory. When cracks are present in structure, natural frequency of material deviates from its original frequency and result difference will measure in term of crack. Whole analysis procedure starting from modelling, meshing and result interpretation done on well-known numerical tool ANSYS. The main aim of proposed study is to detect critical areas especially crack initiative zone before doing actual fabrication of components and avoid the breakage of it. Effects of a breathing crack on the vibratory characteristics of a rotating propeller shaft are investigated. Results of numerical Finite Element Method (FEM) are validated using experimental apparatus called acoustic emission technique.

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