Derivation of petroff's equation || Engineering methods || About bearing and shaft

Here is the one explanation of a derivation of Petroff's equation from engineering methods and problems, much more answer of questions will find outfrom this.. Petroff's equation is defined as the group of dimensionless parameters that govern the frictional properties of the jornal bearing . This equation is based on the following assumptions.. (1). The shaft is concentric with the bearing. (2). The bearing is subjected to light load. Plzz. Watch it and give your suggestions..