Fishing vessels' Rolling bearings reducers of diesel-reducer units: the diagnostics' results

In marine power plants with medium-speed diesels, diesel-reducer units (DRU) being a combination of diesel, gearbox, shaft-generators and other aggregates that can be driven from DRU have become very popular. The basis of the DRU is the main gearbox, which serves to transfer torque to the gross line with a reduction in the speed and drive of the variable speed and alternating current generators (usually with an increase in the speed of rotation in the gear stage). Structural schemes where for the drive of shaft generators, hydraulic pumps, etc. a separate gear reducer is used driven from the main gearbox or directly from the engine have found application as well. The greatest number of revealed defects is associated with the rolling bearings that are part of the gearbox bearing assemblies, as experience in the application of non-dismantling diagnostics for the determination of the technical condition of the DRU gearboxes has shown. For diagnostics of rolling bearings, the method of vibration diagnostics is used based on the spectral analysis of the envelope of the high-frequency component of the vibration signal...