Being an important part in aero-engine

the spiral bevel gears were frequently destroyed from syntony.A modal analysis of the spiral bevel gears under prestress caused by rotating speed and meshing torque was carried out by ANSYS.Dynamic frequencies of the spiral bevel gears with different geometrical parameters were calculated.The finite element models were established using a design and analysis system of spiral bevel gear which had been developed by ourselves.The result shows that rotating speed and meshing torque have certain effect on dynamic frequency.