Solkurvans orsak och konsekvenser
Sammanfattning: The summer of 2018 was a hot year, a significant increase of sun curves was observed by Trafikverket. There are several reasons why a sun curve occurs, in addition to the high temperature. When a sun curve is formed, the conclusion is drawn in many cases that the reason was heat and no further investigations are made. The project consists a literature study that explains the physical theory, factors that lead to a sun curve and the consequences thereof. A summary from Trafikverkets reports on sun curves over the last couple of years gives a good overview of the numbers and causes. Studying Trafikverkets reporting system Ofelia gives a picture of how a sun curves is reported today. To investigate the possibility of predicting a sun curve, the cause of the sun curves is put in focus. The aim of the report is to highlight the underlying factors that cause a sun curve and therefore high focus is placed on literature study as well as statistics. People who do not work in the industry should be able to get a clear picture of the sun curve's emergence and the problems that are created in connection with it. There are various factors, where one or more combined with increased temperature creates sun curves. When a sun curve arises, there are one or more defective components of those that hold the track in place, or that the track is subjected to more and/or larger forces than it is designed for. The most common causes in recent years have been lack of ballast, other material shortage or work in the tracks. The conclusion is that the way in which sun curves are reported today does not follow a sufficiently clear standard. Sun curves that are documented into Ofelia are quite personalized; this makes it difficult to categorize the sun curves after its emergence. With better, more standardized reporting, better statistics follow, which can help to plan preventive maintenance and thus reduce the number of sun curves.
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