Abstract
Loads at which diagnostic research should be carried out were selected of operational investigation and preliminary diagnostic tests. It is difficult to keep the load constant during operational tests, so there is a need to apply the theory of the experiment. Operational investigation determined, the average and representative loads of tested engines driving generators. In preliminary diagnostic tests, the effects of loading on values of diagnostic parameters in various domains of signals analysis were checked and used to reduce the range the diagnostic research. Besides, the most useful symptoms were selected based on the correlation with the load. The diagnostic of pressure in the injection subsystem and in-cylinder pressure signals were subjected to time frequency analysis. In the principal studies, attempts were made to investigate the value of diagnostic symptoms while maintaining a constant load. For operating marine combustion engines, it is difficult to obtain repeatable test conditions because it is dependent on the principles of engine control and consumption of electricity by shipboard receivers. In operational tests on sea-going vessels, a wireless load measurement system and a system for processing and analyzing the parameters of working and residual processes were used. The wireless simultaneous load measurement system was effective in cases where load indicators and meters were away from the diagnosed objects. A wireless load and selected signals transmission system was used in tests on the ship. The aim of the article is to develop diagnostic models for bringing different test conditions to the common representative and reliable diagnostic decision. The article presents how to adjust diagnostic parameters of the working process, recorded at slightly different loads, to the value of common and equal load. This was done based on the best-fitted approximation model.
Highlights
At the stage of tender and conceptual designs, the exact determination of the capacity of the ship’s power plant is difficult, due to the inability to determine electric power demand of the ship
In diagnostics of piston combustion engines, it is not justified to determine all possible points of functioning the object, because their working characteristics are different
Research was undertaken to determine the points of load characteristics because they were mainly aimed at internal combustion engines driving generators
Summary
At the stage of tender and conceptual designs, the exact determination of the capacity of the ship’s power plant is difficult, due to the inability to determine electric power demand of the ship. Even for one type of ship, power distribution differences are relatively large [1]. The development of ship electrification is observed, different for various types [2,3], which translates into higher demand for electricity, even if innovative devices become more energy efficient. The authors in [4] indicated that at present the demand for electrical power generated on vessels is significant increased, due to the increase in electrical equipment. An optimal choice of correct and efficient size of generator sets was made using the traditional method of load factors. The authors solved the optimal problem using genetic algorithms
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