An investigation of tribological behaviors of dynamically loaded non-grooved and micro-grooved journal bearings

Tribological performances of non-grooved and micro-grooved journal bearings were studied under dynamic loading. Numerous experiments were performed using purpose-built test rig and then simulated using various numerical methods. Friction force, friction coefficient, shaft center orbit, and film thickness were determined experimentally and numerically. The experimental and numerical results were in good agreement and the friction forces progressively increased on plain and circumferential, herringbone, and transversally micro-grooved bearing. The results show that it is necessary to complete detailed investigation about the tribological properties of the micro-grooved journal bearing by taking their shape, depth and operating condition into account.

► Dynamically loaded plain and micro-grooved journal bearings were investigated.
► Highest friction force was determined on transversal micro-grooved bearing.
► Friction coefficient showed similar trend to friction force.
► Lowest oil film thickness existed at furthest position from max bearing load occurred.
► Shape and operating condition play important role on performance of journal bearing.