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Evaluation of static stiffness measurements of rail pads
Toman, Radim ; Dubský, Vladimír (referee) ; Hruzíková, Miroslava (advisor)
Rail pads are a part of rail fastening and have an important role for track strain. The main observed characteristics are a static stiffness and a dynamic stiffness of rail pad. At the moment there are two standards for determining static stiffness - the national document General technical conditions (Obecné technické podmínky - OTP) and the european norm ČSN EN 13 146-9. However, the metodology of static stiffness measuring is different. It means different values of rail pads static stiffness. In the OTP there are required values of static stiffneses for baseplate and baseplateless rail fastening. These requirements can't be applied on the static stiffness set by ČSN EN due to different measurement methodology. The aim of this thesis is to measure static stiffness of rail pads according to both methodologies and to check relation between the methodologies. The thesis proceeds from requirements of Správa železniční dopravní cesty - the national organization.
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Experimental Analysis of Chosen Railway Fastening Systems
Tomandl, Vladimír ; Dubský, Vladimír (referee) ; Janoštík, Dušan (referee) ; Hřebačka,, Milan (referee) ; Smutný, Jaroslav (advisor)
Theoretical analysis (i.e. simulation) promoted by the laboratory tests of final product is the important aspect for determination relating to choice and using the new infrastructural constituent. However, the laboratory analysis does not need to make conclusive results in some cases. At that time, it is necessary to complete the process of validation by the measurement in-situ (directly in the track section). The European legislation requires the long-term monitoring of the test constructions in this case. During this time, both the periodic monitoring of the chosen parameters and the following comparison with reference construction are recommended. The reference construction shall be inserted to the same track section and in the same time period as well as the test construction. The track gauge, the longitudinal shifts of rails vis-a-vis the sleepers, the clamping force of fastening, the rail head profile, the sleepers and the state of rail fastenings are possible to classify like the long-term monitored parameters. All these characteristics are so-called static. They are checked in time when no carriages pass through the monitored track section. However, the analysis and determination of the test construction behaviour (dynamic characteristic) are the most accurate by the moving load. Dissertation thesis is focused on measurement and analysis of the dynamic effects at the plain line. The aim of the thesis is the completion of recent system of the new track structures verification for the dynamic parameters observe. Methodology of the measurement and convenient mathematical apparatus for analysing the dynamic effects is proposed.
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Experimental Analysis of Chosen Railway Fastening Systems
Tomandl, Vladimír ; Dubský, Vladimír (referee) ; Janoštík, Dušan (referee) ; Hřebačka,, Milan (referee) ; Smutný, Jaroslav (advisor)
Theoretical analysis (i.e. simulation) promoted by the laboratory tests of final product is the important aspect for determination relating to choice and using the new infrastructural constituent. However, the laboratory analysis does not need to make conclusive results in some cases. At that time, it is necessary to complete the process of validation by the measurement in-situ (directly in the track section). The European legislation requires the long-term monitoring of the test constructions in this case. During this time, both the periodic monitoring of the chosen parameters and the following comparison with reference construction are recommended. The reference construction shall be inserted to the same track section and in the same time period as well as the test construction. The track gauge, the longitudinal shifts of rails vis-a-vis the sleepers, the clamping force of fastening, the rail head profile, the sleepers and the state of rail fastenings are possible to classify like the long-term monitored parameters. All these characteristics are so-called static. They are checked in time when no carriages pass through the monitored track section. However, the analysis and determination of the test construction behaviour (dynamic characteristic) are the most accurate by the moving load. Dissertation thesis is focused on measurement and analysis of the dynamic effects at the plain line. The aim of the thesis is the completion of recent system of the new track structures verification for the dynamic parameters observe. Methodology of the measurement and convenient mathematical apparatus for analysing the dynamic effects is proposed.
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Evaluation of static stiffness measurements of rail pads
Toman, Radim ; Dubský, Vladimír (referee) ; Hruzíková, Miroslava (advisor)
Rail pads are a part of rail fastening and have an important role for track strain. The main observed characteristics are a static stiffness and a dynamic stiffness of rail pad. At the moment there are two standards for determining static stiffness - the national document General technical conditions (Obecné technické podmínky - OTP) and the european norm ČSN EN 13 146-9. However, the metodology of static stiffness measuring is different. It means different values of rail pads static stiffness. In the OTP there are required values of static stiffneses for baseplate and baseplateless rail fastening. These requirements can't be applied on the static stiffness set by ČSN EN due to different measurement methodology. The aim of this thesis is to measure static stiffness of rail pads according to both methodologies and to check relation between the methodologies. The thesis proceeds from requirements of Správa železniční dopravní cesty - the national organization.
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