The influence of quantitative parameters of lubricant oil’s on the damaged of car turbochargers – Event Tree Analysis (ETA) method

Abstract

Abstract. The Event Tree Analysis (ETA) is a tool for assessing system and process safety. It facilitates detecting potential risks, as well as relations existing between actions or events. This method explores the path from the initiating event to the outcome (most often representing the immobilization of the tested object), with particular emphasis on intermediate stages affecting the technical condition of the object. Unlike the FTA analyses, which have a deductive nature, the ETA analysis is inductive. The aim of the work was to estimate the probability of occurrence of unwanted events concerning the operation of a car turbocharger. Based on the performed studies, the impact of the standard safety systems on the operation of the component was checked. Afterwards, more effective safety solutions were proposed. Initiating event was distinguished in the system. The occurrence of such an event could result in a complete immobilization of the component. To accomplish the task, it was necessary to use safety barriers aimed at reducing negative effects of initiating events. The calculation of probabilities of occurrences of various effects in each of the cases helped quantify the selected damages to the turbocharger.