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Numerical Study of Vibration Stress and Deformation of Rotating Fan Blade of a Gas Turbine

kapineepathiah janardhana, S. K. Maharana


The vibration stress caused by resonance is the main cause of failure in aircraft engine blades. The study is aimed at investigating the vibration stress of a single-stage fan blade influenced by the interaction of aerodynamic and structural behavior at multiple critical speeds. A three-dimensional finite element model of the blade was developed for the simulation of vibration stress and its subsequent effects. The blade was verified by modal test. This was to understand the response of the blade when it resonates. The intent was to locate the measure the deformation at a specific location and understand the cause of the strain .It was also observed during the study that there is no positive correlation between the peak stress and critical speed, while it is determined by the comprehensive action of critical speed, vibration mode and synchronous excitation. The peak stress distribution is closely linked to the mode shape of the blade, and it always appears at the leading edge and changes along the blade height. It also illustrates that the leading edge of the blade is most prone to vibration fatigue.
The optimization of the dynamic characteristics shall be done through the optimization toolbox of commercially available MATLAB software. The study of the optimized set of characteristics shall throw light upon the vibration related high cycle fatigue generated for a rotating fan blade. A series of computational modeling methods, using available theoretical backgrounds of stress development, of vibration stress [ hence the deformation ] and optimization techniques to obtain the stress that develop the numerically-determined deformation shall be compared and the findings be presented through the research.

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