Solkurvans orsak och konsekvenser
(2019) VTVL01 20191Transport and Roads
- Abstract
- 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... (More) - 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. (Less) - Abstract (Swedish)
- Sommaren 2018 var ett rekordvarmt år, och en markant ökning på solkurvor konstaterades av Trafikverket. Det finns flera orsaker till varför en solkurva uppstår, förutom den ökade temperaturen. När en solkurva bildas dras slutsatsen i många fall att anledningen endast är hög temperatur och vidare undersökningar utesluts direkt.
Detta examensarbete består till stor del av en litteraturstudie som behandlar den fysikaliska teorin, faktorer som leder till en solkurva samt konsekvenser av dessa. En sammanställning av Trafikverkets rapporter om solkurvor under de senaste åren ger en god överblick över antal och orsaker. Genom att granska Trafikverkets rapporteringssystem Ofelia nås en aktuell bild av hur solkurvor rapporteras idag. För att... (More) - Sommaren 2018 var ett rekordvarmt år, och en markant ökning på solkurvor konstaterades av Trafikverket. Det finns flera orsaker till varför en solkurva uppstår, förutom den ökade temperaturen. När en solkurva bildas dras slutsatsen i många fall att anledningen endast är hög temperatur och vidare undersökningar utesluts direkt.
Detta examensarbete består till stor del av en litteraturstudie som behandlar den fysikaliska teorin, faktorer som leder till en solkurva samt konsekvenser av dessa. En sammanställning av Trafikverkets rapporter om solkurvor under de senaste åren ger en god överblick över antal och orsaker. Genom att granska Trafikverkets rapporteringssystem Ofelia nås en aktuell bild av hur solkurvor rapporteras idag. För att undersöka möjligheten att förutse en solkurva läggs solkurvornas orsak i fokus.
Målet med arbetet är att framhäva de bakomliggande faktorerna som orsakar en solkurva och därför läggs hög fokus på litteraturstudie samt statistik. Olika arbeten i spåret i form av underhåll beskrivs och hur det påverkar spåret. Utomstående personer som inte jobbar inom branschen ska kunna få en tydlig bild av solkurvans uppkomst och problemen som skapas i samband med detta. Det finns olika faktorer, där en eller flera kombinerat med ökad temperatur skapar solkurvor.
När en solkurva uppstår, är orsaken en eller flera bristande komponenter av dem som håller spåret på plats, alternativt att spåret utsätts för fler och/eller större krafter än vad det är konstruerat för. De vanligaste orsakerna under de senaste åren har varit ballastbrist, annan materialbrist eller som ett resultat av arbete i spår.
En av arbetets slutsatser är att sättet som solkurvor rapporteras på idag inte följer en tillräckligt tydlig standard. Solkurvor som läggs in i Ofelia är till stor del personligt beskriva, vilket gör det svårt att kategorisera solkurvorna efter dess uppkomst. Med en bättre, mer standardiserad rapportering följer mer tillförlitlig statistik, något som kan hjälpa till att planera förebyggande underhåll och på så sätt minska antalet solkurvor. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/8995574
- author
- Holm, Amanda LU and Vik, Malin LU
- supervisor
- organization
- alternative title
- The cause and consequences of the sun curve
- course
- VTVL01 20191
- year
- 2019
- type
- M3 - Professional qualifications ( - 4 Years)
- subject
- keywords
- Solkurva, temperatur, längdutvidgning, faktorer, konsekvenser, statistik
- report number
- ISRN LUTHBG/THID-20/5587
- ISSN
- 1651-2197
- language
- Swedish
- id
- 8995574
- date added to LUP
- 2019-11-25 12:39:41
- date last changed
- 2020-06-11 13:38:54
@misc{8995574,
abstract = {{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.}},
author = {{Holm, Amanda and Vik, Malin}},
issn = {{1651-2197}},
language = {{swe}},
note = {{Student Paper}},
title = {{Solkurvans orsak och konsekvenser}},
year = {{2019}},
}