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Alignment Design

MOUS_ICO Menu: Railway > Alignment Design Alignment Design
MOUS_ICO Toolbar: Railway: Alignment Design Alignment Design
MOUS_ICO Ribbon: Railway > Project: Alignment Design Alignment Design

Alignment Design is basically developed from 'Novapoint Road Professional'. The same module is upgraded for 'Novapoint Railway', considering the Railway Engineering concepts and named as 'Alignment Design Railway'.

  • All the specific functions developed for railways are described in the following topics:
  • Input H Railway: For railways, Cant (h), Length (L), Element Speed, Insufficient Cant (I), Gradient (dh/L), dl/dt and dh/dt are the additions.
  • Input V: Design constant 'K' is the addition of !!Alignment Design!! Railway.
  • Speed Profile Diagram: The graphical representation of element speed along the alignment.
  • Horizontal Offset Diagrams: The graphical representation of horizontal offsets of current alignment from defined reference line (adjacent tracks or any other objects; for further details on defined reference line, refer the topic 'Reference Points' in the help file of the module 'Alignment Design').
  • For rest of the functions refer the help file of the module 'Alignment Design'.
  • This topic holds general information on Alignment Design Railway.
  • Position of Horizontal Alignment: Centre line of the track is the position of horizontal alignment.
  • Transition Curves: For transition curves only 'Transition curves' can be used.
  • Position of Vertical Alignment: Top surface of the lowest rail is the location of vertical alignment.
  • Summit/Valley Curves: Alignment Design Railway can support 'Parabolic' and 'Simple' curves for vertical alignment.
  • By default simple curves will be used for vertical alignment.
  • Activating parabolic curves: Refer the topic 'Parabolic Curves' in the help file of the module 'Alignment Design'.
  • Alignment data is displayed on different tabs of the dialog box Alignment Design Railway.
  • The speed values defined in 'Alignment Design Railway' are 'Element Speed'. These are not 'Design Speed', but the same values can be used as design speed with the tool 'Speed Profile' of 'Track Data'.
  • The Cant Values defined in 'Alignment Design Railway' are 'Element Cant Values'. The same values can be used as design values using the tool 'Cant Settings' of 'Track Data'.
  • Element Speed and Cant Values are stored in Novapoint Project Settings. Save the Project Settings from time-to-time.
  • The rail lines can also be drawn along with the alignment using the option 'Parallel Lines' (for further details on the function 'Parallel Lines', refer the topic 'Parallel Lines' in the help file of the module 'Alignment Design').
  • Display of tabs in the dialog box 'Alignment Design Railway' can be controlled using the function 'Options'.
  • The column 'Radius' of the tab 'Input H Railway', can be activated using 'Options'.
  • For further details on the function 'Options', refer the topic 'Options' in the help file of the module 'Alignment Design'.
  • Make sure that alignment design function for Railway Tracks is started from the following locations (either Railway menu or the toolbar Railway):

Note: The 'Object Menu (NCO)' can also be used to start the function 'Alignment Design Railway'. Activate the function 'Object Menu (NCO)' and select either an existing alignment, or a line or polyline from the plan drawing. From the pop up menu select 'Alignment Design Railway'.

The user interface 'Alignment Design Railway' will pop up.

Tip:

  • While designing double track with two reference lines (alignments), opt the option 'Copy and Offset' to copy the current alignment at an offset on desired side.
  • This reduces the work of designing other alignment of double track from scratch.
  • For further details on the function 'Copy and Offset', refer the topic 'Copy Tools' in the help file of the module 'Alignment Design'.

Alignment Design Menu

Speed/Horizontal Offset Diagram

Speed Diagram

The function 'Speed Diagram' can be accessed from the following location of the dialog box 'Alignment Design Railway':

MOUS_ICO Menu: Tools > Speed Diagram

The speed profile will be graphically represented in the window 'Diagram'. Speed profile diagram is a graphical representation of chainage on X - axis and Speed on Y - axis.

Horizontal Offset Diagram (Reference Points)

The function 'Horizontal Offset Diagram (Reference Points)' can be accessed from the following location of the dialog box 'Alignment Design Railway':

MOUS_ICO Menu: Alignment Design Tools Horizontal Offset Diagram (Ref. Points)

Based on the user-defined 'Reference Point(s)' and/or 'Reference Line', the function 'Horizontal Offset Diagram (Reference Points)' calculates the offset distances from the 'Design Line' (alignment being designed) to the 'Reference Point(s)/Reference Line' and represents the offset distances graphically.

  • For further details on reference points/line, refer the topic 'Reference Points' in the help file of the module 'Alignment Design').

Tip: This tool can be used to see how far the design line is located from the Reference Point(s)/Reference Line.

Input H Railway

Cant (h)

Input value for Superelevation/Cant (h) is to be defined in the white cells (Curve/Arc element rows) of the column 'Cant (h)'.

  • User has to consider the maximum permissible cant value while defining the input values.
  • Insufficient Cant value will be displayed at the column 'Insufficient Cant (I)' which should not exceed maximum permissible insufficient Cant.
  • User has to manipulate the values of Cant (h), Transition curve length (L), Radius of Curve, Element Speed so as to bring the insufficient Cant within permissible limits.
  • User can manipulate these values by editing the values in the interface or editing the Design Line (the graphical alignment on AutoCAD).

Alternatively, design value for 'Cant (h)' can also be defined in the function 'Track Data'. See the topic 'Cant Setting'.

Note: The input values defined for cant (h) can be imported to the 'Cant Settings' using the option 'Get Object' and selecting the alignment objects. Cant settings also allow to edit the cant values. The cant values of this interface will be updated automatically when they are edited in the dialog box 'Track Data' - Cant Settings. This is possible only when the cant values are imported to cant settings from the database.

Length (L)

The individual length of alignment elements will be displayed in this column. Only 'Transition Element's' length can be edited in the interface. Lengths of all elements of alignment can be edited from the shortcut menu of the design line (for further details on shortcut menu options, refer the topic 'Shortcut Menu' in the help file of the module 'Alignment Design').

Speed

Element speeds for the elements (line segment, arc/curve segment and transition curve) of the alignment are to be defined at this column. The same element speed values can be used as design speed, which is to be defined in 'Track Data - Speed Profile'.

Alignment need not have same design speed through out its length. Design speed is defined on section basis.

Insufficient Cant (i)

The difference between the input cant (h) value and the actual cant required for a specified speed on a curve with particular radius, will be calculated by the program and displayed in the cells of this column.

Gradient (dh/L)

This value for transition curves is calculated by the program using the values 'Cant (h)' and 'Length of Transition Curves Elements (L)'.

di/dt

This value is function of 'Insufficient Cant (i)' and 'Element Speed'. Depending on these values, program calculates the value 'Insufficient Cant (i)/Time taken to cover the transition curve element with the element speed (Transition Curve)'.

dh/dt

The value 'dh/dt' is a function of 'Cant (h)' and 'Element Speed'. Depending on these values, program calculates the value 'Cant (h)/Time taken to cover the transition curve element with the element speed (Transition Curve)'.

Input V

  • K: Design Constant for Parabolic curves.
  • Activating parabolic curves: Refer the topic 'Parabolic Curves' in the help file of the module 'Alignment Design'.
en/np/rail/menu/alignment_design/start.txt · Last modified: 2014/02/12 13:20 by vn_no_rbr