Computational analysis of spur gear pair in healthy and faulty condition

Spur gears are parallel shaft axes gears used to transmit motion, power or torque from one shaft to another shaft. In working condition, gear drives experience variation in load and speed. Small misalignment, imperfection and defects in the gear pair may increase the noise and vibrations level in gear box. Vibration and noise may caused due to the misalignment, scoring of gear tooth, broken gear tooth, cracking, eccentricity in driving members, etc. The suitable design steps of spur gear always lead to minimization of the noise and vibration level in the gear pair. In this work alloy steel is considered as gear pair material. Two different gears, first is healthy gear and another is single tooth broken i.e. defective gear is modeled using CATIA and then it is analyzed for modal as well harmonic response at different torque values. The result obtained indicates natural frequency is higher at last mode and mode shape for last is bending and torsional. Deformation and stress is higher at Y-axial direction Also, total directional deformation is higher in single tooth broken i.e. in defective gear at the torque of 58670 MPa.