Reliability Assessment of Aircraft Commutators

The article describes the method of predicting reliability and durability an aircraft commutator, which is a primary source electric energy in helicopters. Tests were conducted for 10 starter-generators. From this research it follows that technical condition brushes bearings has significant impact on starter-generators was determined based consisting two stages adopted: first stage involved determining density function changes diagnostic parameter depending operating time, but second included assessment starter-generator taking into account real flight profile. adopted consisted defining dynamic model changing length starter-generator’s brush, became probabilistic model. Subsequently, differential equations, Fokker–Planck partial equation derived, process increasing brush wear way. This enables prediction residual helicopter’s due to change during operation. allows building upon average Owing difficulty measuring bearings, relation between temperature surroundings can be applied by replacing altitude with temperature. serial-type structure.