Nikolai Pavlovich Petrov

Nikolai Pavlovich Petrov (13 May 1836 – 15 January 1920) was a Russian army professor of mechanics and engineering who is considered one of the founders of tribology or the study of friction and lubrication.

Petrov was born in an aristocratic family in Novgorod.

He studied mechanics under M. V. Ostrogradsky and then joined as a professor of applied mechanics at the Nicholas Engineering Academy in 1867.

His main work was on the examination of railway vehicles, examining steam engines, and his main work was on the lubrication of bearings for the wheels.

He examined journal bearings used in the axles of the wheels of railway coaches and identified a relationship on friction in rotating components, the viscosity of lubricants and frictional torque which goes by the name of Petrov's Law (or Petroff's Law).