Analysis of accelerated methods testing piston engine for reliability

Abstract

The analysis of accelerated bench methods of testing piston engines for reliability is carried out. For accelerated testing, it is necessary to reduce the engine operating time before failures occur. Although the loads on the engine parts during accelerated tests differ from the loads in real operation, it is necessary to ensure a qualitative similarity of real and simulated loading processes when organizing them. To assess the quality of accelerated tests, use the acceleration coefficients for operating time or acceleration over time. Various methods of accelerated testing are analyzed due to forcing the conditions for using a special working cycle of the internal combustion engine, for example, for such failures as coking of diesel injectors. For an accelerated assessment of the fatigue strength of the parts surrounding the combustion chamber, the firing surface is heated and then cooled with water. More severe external conditions can also be achieved by increasing the amount of dust supplied with air and oil, increasing or decreasing the ambient temperature. In such tests, after comparing failures during accelerated (model) tests, as well as in operation, the test methodology is adjusted.