Internal spur gear is the object of study

and the solid model is built based on PRO/E

while finite element is built based on PRO/MECHANICA.Make use of sensitivity analysis technology of PRO/MECHANICA to study the main structure parameter witch affects internal spur gear inherent frequency.The graph of relation between inherent frequency of internal spur gear and its structure parameters are obtained.The results indicate that increase the modification coefficient

pressure

module

tooth number or addendum coefficient

the inherent frequency will be decreased.Witch provides the theory basis for vibration reduction design and noise control and dynamics analysis and optimization of internal spur gear transmission.