An Experimental Test Rig for the Investigation of Vibration Transmission Characteristics of Roller Bearings

摘要

The perceived levels of certain types of noise such as gear whine and gear rattle in automobile gearboxes are greatly influenced by the transmission characteristics of the bearings supporting the primary and secondary shafts as well as casing design. To investigate the parameters affecting this problem a static test rig was constructed to measure the vibration transmission characteristics of different bearings under varying loading conditions. A shortened gear shaft is assembled with the bearing which is housed in a standard square plate fixed to rigid supports. Static loads are applied in the axial and radial directions using elastic elements. Dynamic loading is applied using a small shaker via an impedance head which is connected to measure axial force and acceleration. The bearing transmission characteristics are investigated by comparing the acceleration inputs and outputs measured on the inner bearing ring and housing plate, respectively.Initial work has been concentrated on the transmission of the axial components of shaft vibrations. Transfer function measurements were performed for a frequency range up to 5000 Hz and significant differences were found for different types of bearing. As expected, these differences were mainly related to the axial stiffness characteristics.