The specific effects of fast start on accelerating the aging of diesel generating units mainly include the following aspects:
(A) The rapid rise of the diesel generator set makes the force of the piston ring on the cylinder wall and the load on the bearing great when the normal lubricating oil film is not completely formed. This metal-to-metal contact can cause wear on the cylinder walls and cam surfaces and accelerate wear on the main and connecting rod bearings.
(B) During the rapid acceleration process, the crankshaft without the torsional vibration damping device will produce strong crankshaft torsional vibration. For some diesel engines without torsional vibration dampers, crankshaft cracks appear. The enlarged torsional vibration of the crankshaft is considered to be the cause of this situation. Torsional vibration also occurs in other diesel engine components, such as diesel-driven water pumps, camshafts, and gears.
(C) Under the condition that the thermal equilibrium is not reached, the rapid rise of the diesel generator set and the load will cause the cylinder block and the crankcase to withstand high mechanical and thermal stresses, which may easily cause distortion and deformation of the diesel engine structure. These distortions in turn cause contact (friction) between metals and accelerate component wear.
(D) Diesel generator sets are more prone to overspeed during the rapid speed-up process. This overspeed condition will increase the stress on the diesel engine and generator components, thereby accelerating mechanical wear.
(E) The rapid rise and load of diesel generator sets will accelerate the wear of the turbocharger, especially when the turbocharger lubrication has not been fully established.
In summary, during the rapid start of a diesel generator set, vibration shock, torsional vibration, crankcase vibration, and turbocharger vibration of the main and connecting rod bearings are more likely to occur, leading to accelerated wear and aging.