Swedish railway network is old, it is in need for maintenance and there is an ever-increasing volume oftraffic on todays railroads. Special trackwork component has taken increased abuse, leading to a stop intrain traffic and many delays occur, especially during the winter season. The most sensitive parts of therailway network are turnout frogs and they require the most maintenance and cause delays. Therefore, TheSwedish Transport Administration is planning to investigate and introduce a new type av railwayswitches, called flange bearing technology. Flange bearing frogs and diamonds are already in use in USand there are already benefits in both reduced maintenance and increased life expectancy and possiblyreduced noise level.Therefore, this bachelor thesis is investigating flange bearing technology with an accent on sound levelmeasurement. It is studied how flange bearing frogs works and how they differ from conventional treadbearing frogs. In addition, there is a field study with sound level measurement and interviews withemployees at The Swedish Transport Administration. Furthermore, it is investigated how flange bearingtechnology is used in US. This bachelor thesis is limited to a field research with sound level measurement,interviews, and a theoretical description of railway switches. Field study is located at a flange bearingfrog, station Globen-Gullmarsplan in Stockholm. This flange bearing frog is used as a connection betweenthe tram railway and the metro railway.Flange bearing technology has a simpler design compared to conventional tread bearing frogs. This simpledesign can provide benefits by reducing vertical dynamic loads. Flange bearing means that unsupportedflangeway gap is eliminated from the running surface of the frog. For that reason, there is no speedreduction on the main track. Conventional tread bearing frogs have unsupported flangeway gap thatwheels must cross.Field study at Globen-Gullmarsplan was carried out with the help of a sound level meter and it wasperformed eight measurements at both flange bearing frog and conventional tread bearing frog. This studyshows that flange bearing frogs causes less noise than conventional tread bearing frog. Interviews showsthat The Swedish transport Administration is working to reduce noise interference from rail traffic andthat flange bearing technology can be a good solution for achieving lower noise level. However, moreresearch is required about maintenance, comfort, cost, and life expectancy of flange bearing technology.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:kth-287208 |
| Date | January 2020 |
| Creators | KLENCOVLJEVIC, Goran, Shuvo Khan, MD |
| Publisher | KTH, Byggteknik och design |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | TRITA-ABE-MBT ; 20411 |
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