Rolling Stock > Train Definition

Definition of the Load Trains to be taken into account in the analysis. The trains of the HSML-A series, HSML-B, Train types as specified in the Eurocode Appendix D and OEBB railjet trains can be selected to be considered. Other train types can be specified be entering the respective series of axle loads with the distances.

Setting

Description

Train Selection

Selection of the type ranges of trains to be considered. Available are the ranges HSML-A, HSML-B, EC trains as to the Eurocode, Railjet and "Others", as directly specified by the user.

Setting	Description
All	All available type ranges are considered.
Selection	The required type ranges are selected from the available type ranges by ticking the respective checkboxes.

Table of trains

Setting	Description
Name	Name of the train model (e.g. HSML-A1, HSML-A2, ...)
Max.V	Maximum travel speed of the train (the train is not considered for higher velocities)
ndiv	Distribution of the axle loads on 1, 2 or 3 cross-ties. Equal distribution on 2 crossties, ratio 1:2:1 for distribution over 3 cross-ties.
a	Distance between cross-ties (Default 65 cm)
Calc(yes/no)	The train is considered in the analysis (yes) or not considered (no).
Calculate	Calc(yes/no) is set to yes or no if the respective checkbox is checked or unchecked. This modification is done for the currently selected train or for the marked trains.
Function "Modify"	Modify parameters Max.V, ndiv and a for the currently selected train.
Function "Delete"	Delete the currently selected train from the table of train models. Only available for user-defined train models.

Note: Trains are marked with the <Space> key or the context menu with the right mouse button. Parameters are modified for all marked trains or the selected train, if the respected check box is ticked.

Table of axle loads of the currently selected train

The predefined train models of the HSML-A, HSML-B and HSML-C range contain the axle loads specified in the design code and the respective distances.

Setting	Description
F	Axle load
d	Distance to the next load (must be zero for the last load of the train)
Function "Add"	Adding a new load at the end of the table of axle loads. The values F and d given in the fields below the table are transferred to the table.
Function "Modify"	Modification of the selected line of the table of axle loads. The values F and d given in the fields below the table are transferred to the table.
Function "Delete"	The currently selected line of the table of axle loads is deleted
Function "Clear"	The table of axle loads is completely cleared
Function "Preview"	The currently selected load train is graphically presented for control purposes
Function "Save"	The current table of axle loads is stored in the table of trains (not allowed for the HSML train models defined internally in the program)
Function "Save as"	The current table of axle loads is stored in the table of trains under a new name.

Note: Axle loads are marked with the Space key or the context menu with the right mousebutton. Parameters are modified for all marked or selected axle loads, if the respected check box is ticked.

Governing Parameters of the Analysis

Setting	Description
Vmin	Minimum travel speed to be investigated (in km/h)
Vmax	Maximum travel speed to be investigated (in km/h)
Vstep	Step of the travel speeds to be investigated (in km/h)
Sampling rate	Length of the individual time steps used in the time stepping scheme (in sec) Note: The required time step length is dependent on the natural frequencies of the structure, which shall be considered in the analysis. The results can be assumed accurate enough, if one period is modeled by at least 10 time steps. Hence, for getting accurate results for a relevant natural frequency of 10 Hz, a time step length not greater than 0.01 sec must be chosen. In the case of small structures, where the relevant natural frequencies reach up to 30 Hz, smaller time steps (e.g. 0.003sec) have to be taken. Note that the Newmark method is unconditionally stable also with very large time step lengths, although the results may be quite wrong.
Max. Acceleration	Allowable vertical acceleration of the relevant points of the structure. Limit value, governing the investigation of different travel speeds. The investigation of a train is dropped, when the value is exceeded in one of the relevant points. The investigation of subsequent trains is limited to the speed, where a previous exceeding has occurred.
ADDITIONAL PARAMETERS of HSLM-B TRAINS	The HSLM-B train model is a model, where a certain amount of axles is arranged with constant spacing. The design code demands using different numbers of axles and different distances for bridges with different span lengths. In the program, these values can be entered by the user.
HSLMB (N)	Number of axles of the HSML-B train.
HSLMB (d (m))	Distance between the axles of the HSML-B train.