# Recommended names for masses and couplings

The user can use any names he or she wants to when creating the masses and couplings, but it is recommended to follow a convention in order to more easily read input data files written by other people.

Recommended names for distances:
 a or A Longitudinal distance b or B Lateral distance h or H Vertical distance Examples: aba_ Longitudinal distance from middle of bogie to middle of axle (wheelset) acb_ Longitudinal distance from middle of car-body to middle of bogie czcb.A_ Attachment point, longitudinal position, vertical secondary damper czcb.Hc_ Attachment point, vertical position in car-body, vertical secondary damper czcb.Hb_ Attachment point, vertical position in bogie, vertical secondary damper

Recommended names of the masses:
 car_1 car-body bog_11 bogie frame bol_11 bolster beam axl_111 Axle and/or wheelset whe_111r Free rotating wheel or resilient wheel trc_111 The accompanying piece of track under each wheelset grd_111 The fix point under each piece of track

Numbering system
As can be seen in the above:
One digit refers to the number of the vehicle.
Two digits refers to the number of the bogie or bolster beam. The first bogie in the first vehicle is denoted 11, the second bogie in the first vehicle is denoted 12, the first bogie in the second vehicle is denoted 21,,, etc.
Three digits refers to the number of the wheelset, track piece or ground. The first axle in the first bogie in the first vehicle is denoted 111, the second axle in the first bogie in the first vehicle is denoted 112, the first axle in the second bogie in the first vehicle is denoted 121,,, etc.

Recommended names of the couplings:
The name should mainly be build up by the following parts:

1. Type of coupling:
 k =  Stiffness c =  Viscous damper kc =  Viscous damper with serial flexibility kf =  Friction damper with serial flexibility
2. Direction of action:
 x =  Longitudinal y =  Lateral z =  Vertical f =  Roll k =  Pitch p =  Yaw c =  Direction of coupling m =  Matrix direction
3. Body connected to the first end of the coupling:
 c =  Car-body b =  Bogie l =  Bolster beam a =  Axle (wheelset) w =  Wheel r =  Rail t =  Track g =  Ground
4. Body connected to the second end of the coupling:
 c =  Car-body b =  Bogie l =  Bolster beam a =  Axle (wheelset) w =  Wheel r =  Rail t =  Track g =  Ground
5. The number of the coupling.
If the coupling exists on both right and left side of the vehicle, the letters "r" or "l" could be added to the coupling-number.
If the coupling exists both forward and backward in the bogie, the letters "f" or "b" could be added to the coupling-number.
Examples:
 kzcb11r Secondary spring kfcb11 Anti-roll bar kycbs11 Secondary lateral bumpstop cycb11r Secondary lateral hydraulic damper czcb11r Secondary vertical hydraulic damper cccb11r Yaw damper kzba111r Primary spring czba111r Primary vertical hydraulic damper kytg111 Lateral track stiffness cytg111 Lateral damping in track

Names generated in substructure wr_coupl: