TO STUDY AND ANALYSIS, THE EFFECT OF NOTCH GEOMETRY ON THE CRITICAL SPEED OF STRUCTURAL STEEL SHAFT

Mechanical Engineering,

The research was carried out using the finite element method. We create the model and analysis it for ANSYS 19.2 as well. The analysis shows that when the RPM increases, the critical speed is simultaneously lowered by a solid shaft and materials such as structural steel of the shaft. To compare the natural frequency of the shaft, three different notch angles 45o , 60o , 80o are used. According to projections, 60o notch angle shaft will provide higher frequencies in different modes for solid shaft profiles. 60o notch angle shows higher convergence in the stability of a rotor dynamics system as a result. As We have considered three different notch angle 45o, 60o, 80o, the gyroscopic effect is effect at 45o and 80o of notch angle this is due to the approach of these notch angles affects the frequency as indeterminant effect occurs at axial distance of shaft but this effect is minimized at 60o of notch angle. We found the best results with the structural steel material as it has a lower critical speed and higher natural frequency than alloy 6061 at all different notch angles

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