Internal additional dynamic forces, which change the tooth stress and affect the noise behaviour of the transmission, occur in running transmissions. The NVH behaviour of gears is becoming more and more important due to the increased customer expectations regarding noise. The additional dynamic forces must be considered during development of highperformance transmissions. Experimental and theoretical investigations are used to determine these additional dynamic forces and to develop and improve analytical calculation models for the simulation of excitation and vibration behaviour.

In the dynamic test rig for cylindrical gears, the torsional and bending vibrations are measured on the gear housing with piezoelectric accelerometers. In addition, the measurement of airborne and solidborne sound on the gear case is possible.

The rigidity of the meshing teeth is of vital importance for the numerical determination of the internal dynamic forces, the load distribution across the face width, and the load distribution of intermeshing teeth.