The technological cycle of the large volume current repair (TR-3), carried out in a depot, includes long and labor-consuming operations of removal, dismantling for audit, repair, assemblage, tests, transportation of the equipment and assemblies and their back mounting on an electric multiple unit. At the last stages of this cycle the repaired, tested and operable equipment can be damaged, as well as its working capacity, being a part of the electric multiple unit system, can be disturbed owing to violation of functional interrelations.
Lack of appropriate means and methods for an objective quality control of repair, assemblage and adjustment of responsible and most difficult systems of the electric multiple unit, i.e. first of all electrical circuits, within a limited idle time at the depot does not allow to carry out a high-quality control of the performed works. As a result, “raw” electric multiple units are admitted to an after repair running and besides undebugged (hidden) defects, which percentage reaches from 30 to 40 %, have many new ones, appeared due to a so-called human factor. Duration of a debugging stage, success of acceptance tests and further non-failure operation of an electric multiple unit in this case directly depends on debuggers’ qualification and their other subjective qualities.
It is possible to change radically the current situation on the basis of automatic systems for comprehensive diagnostics - to transfer the debugging stage from under a contact wire to a repair shop with simultaneous reduction of its duration, as well as to provide the quality assessment objectivity for the repair, assemblage and adjustment of the electric multiple unit equipment and systems and, as a result, to increase percentage of zero defects since the first presentation within acceptance tests. Such systems are based on the automated expert system for malfunctions detection, which excludes a diagnostician’s subjective errors and provides a reliable quantitative and qualitative assessment for a technical state of the electric multiple unit most difficult and responsible systems according to the main regulating documents requirements.
Kostyukov V.N., Kostyukov Al.V., Kazarin D.V. Equipment diagnostics in electrical circuits of electric multiple units when debugging and acceptance tests // Control. Diagnostics. - 2010. - №1. - pp. 26-35
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