Investigation of wear of the internal combustion engine at the transient operation modes

Abstract

The analysis of the service life of the actuator and mounted mobile cranes causes premature failure of the main friction surfaces of engine parts.

Investigations of wear of the internal combustion engine parts during transient operating conditions using the method of experimental design, implementation of which was carried out on a programmable stand. Stochastic model of each stage of the test were waveform recordings engine operation under real operating conditions. Experimental Design was performed by iteration with the speed, temperature and the dynamic parameters, as well as the coefficient of dynamic mechanical system "motor - transmission - the goods".

Physical modeling was performed using software installation based on the inputted therein algorithms. This setting is to set different modes (corresponding to 4 iterations of steps) experimental engine. Statistical processing of waveforms with the records engine operating modes under operating conditions will allow to select the typical waveforms and use them to create algorithms for test programs. When thus considered coolant temperature and oil load value and its time variation, velocity and acceleration of the crankshaft.

The obtained data using the correlation-regression analysis were processed on the computer according to the program, which consisted of four standard blocks: preliminary statistical analysis, multiple regression analysis, pair and multi-level correlation analyzes. The application of this program allowed, with the precision of the highway, to perform a selective selection of parameters, highlighting the main factors determining the deterioration of the engine. As a result, for each type of engine, mathematical models were described that describe the relationship between speed, load and temperature parameters and the intensity of wear.

To implement the fifth step iteration was conducted varying the moment of inertia of the flywheel masses variable experimental setup. The design allowed to change the dynamic coefficient of a mechanical system. Dependencies of engine wear changes are obtained the basic speed and load parameters. The degree of influence of each of these parameters on the wear of the internal combustion engine.