Hi everybody,
I am currently trying to create a numerical model of a Bögl slab track and I was wondering which is the simplest way to simulate the rail pads between the sleepers and the rails.
I would appreciate any kind of help, thank you.
Dear Alberto,
I hope that my reply doesn´t come too late.
If I understand the Bögl catalogue correctly, the rails are supported by separate pads in the Bögl slab track. Therefore, I don´t think that the modelling of the pads is different for a slab track or for a track using sleepers.
However, by selecting a modelling for the pads, some other aspects should be considered, especially:
1. the purpose of the model, i.e. are you interested in the vertical behaviour or also in the lateral behaviour?
2. the frequency range
3. if you intend to use a modal decomposition, then your model has to be linear including the model for the pads.
There are two phd theses from TU Delft, which I find quite interesting in this context. Unfortunately, the documents are too large to upload them here. You can download the thesis by Périard here:
https://repository.tudelft.nl/islandora/object/uuid:c8dc2574-e837-4c55-98fb-ca2dc2223fb0?collection=research
The track model is discussed in chapter 4, the modeling of the pads in section 4.7. However, if you resolve the cross section of the rail, then the model of the pad as one discrete element should be replaced by distributed stiffnesses and dampings. This problem is also illustrated in the thesis by Oregui Echeverria-Berreyarza, which you can download here:
https://repository.tudelft.nl/islandora/object/uuid%3A0997d21a-bc6e-43bc-8a0c-55341c65e3ce
The modelling of the pads is discussed in section 5.2.
Although I don´t consider myself as the ultimate expert in track modelling, feel free to contact me if you have any more questions.
Best regards from Madrid,
Ingo
I'm sending you information about the stiffness of rail pads and intermediate plates for
highly elastic rail fastening systems.
It depends on what you are trying to study, you can model the railpad in three ways:
1-as a spring-damper linear element. This is the simplest way, however this technique will give limit insight to the behaviour of the pad. For this you will need linear spring stiffness of the pad and damping.
2- you can also model the pad a solid elastic element. This give you more insight into the stress state within the pad. For this you will need pad diminsions, Young's modules and density.
3- finally you can model the pad as a solid hyperelastic element. This accounts for non-linearity in pad behaviour. However, for this you require test data to input the modelling. Please keep in mind this technique may increase your comuptational time significantly sine the stiffness of the pad will be stress dependent.
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