Abstract
This paper presents the planning of an experiment aimed at determining the scope of scientific research. It has been demonstrated in the conducted reliability investigations that main and auxiliary combustion engines, chosen as the objects of marine vessels, are the most unreliable components of injection apparatus as a weak link of a fuel feed functional system. The author seeks to use the minimum number of diagnostic parameters to obtain the maximum amount of information about the state of the test object. Reliability indexes, theoretical research and preliminary diagnostic tests were used to select the diagnostic signal reception points. In the initial determination of the measured quantities, the following methods were used: decomposition of the combustion engine on a functional systems, significant assemblies and elements, analysis of working and residual processes. Preliminary tests of the injection subsystem were carried out outside the internal combustion engine, as well as tests on real objects in laboratory conditions and in the conditions of marine vessels. To obtain a lot of information about the research object, a lot of diagnostic parameters were used at the beginning. On this basis, the preliminary selection of signals and diagnostic parameters related to the technical state was carried out, conducting the analysis in the various domains. Methodical and experimental diagnostic models were elaborated.
Highlights
Complexity of the design of contemporary floating objects requires the development of appropriate methods to control their correct operation, which in turn justifies the desirability of developing effective methods for planning diagnostic experiments
The applied procedures of planning diagnostic experiments included the selection of features of the object’s state, diagnostic parameters and observation sites, as well as diagnostic symptoms. It results from the strategy of operation of objects based on their technical state aimed at in order to rationally plan diagnostic tests [1,4,5,6] and the ISO 3534-3 standard
For diagnostic tests aimed at determining the relation between the diagnostic parameter and the technical state, the following types of experiment were distinguished: active, passive and passive–active
Summary
Complexity of the design of contemporary floating objects requires the development of appropriate methods to control their correct operation, which in turn justifies the desirability of developing effective methods for planning diagnostic experiments. The applied procedures of planning diagnostic experiments included the selection of features of the object’s state, diagnostic parameters and observation sites, as well as diagnostic symptoms It results from the strategy of operation of objects based on their technical state aimed at in order to rationally plan diagnostic tests [1,4,5,6] and the ISO 3534-3 standard. The above-mentioned works in the field of experimental planning provide a significant contribution within the scope of research limitations [1], planning and performing an optimal experiment [2], pre-selection of diagnostic parameters and choice of principal test conditions [3], proposing a new approach to building the diagnostic model [4], determining of the points of conducting a factor experiment in a specific order [5] and application in the creation of a new quality [6]. The selection of measured quantities, locations of signal receiving points and conditions of testing combustion engines is typically made on the basis of literature-based knowledge, experience or intuition
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