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Calculation of roll coefficient on tangent track

Program QUASI in the GENSYS package can be used when calculating the roll coefficient of the carbody. In order to make the calculation the input data file has to be prepared in the following way.

• Copy the Master file:

  copy -ip runf/tang_ideal_MXDp3.tsimf runf/tang_ideal_MXDp3_RollCoeff.quasif
  

• In the end of file runf/tang_ideal_MXDp3_RollCoeff.tsimf Set constraints to the wheelsets, in order to put the vehicle in a tilted position:

    constr fix_rigid_1 axl_111  x 0.000   
    constr fix_rigid_1 axl_112  x 0.000   
    constr fix_rigid_1 axl_121  x 0.000   
    constr fix_rigid_1 axl_122  x 0.000   
    constr fix_rigid_1 axl_111  y 0.000   
    constr fix_rigid_1 axl_112  y 0.000   
    constr fix_rigid_1 axl_121  y 0.000   
    constr fix_rigid_1 axl_122  y 0.000   
    constr fix_rigid_1 axl_111  z 0.000   
    constr fix_rigid_1 axl_112  z 0.000   
    constr fix_rigid_1 axl_121  z 0.000   
    constr fix_rigid_1 axl_122  z 0.000   
    constr fix_rigid_1 axl_111  f 0.001   
    constr fix_rigid_1 axl_112  f 0.001   
    constr fix_rigid_1 axl_121  f 0.001   
    constr fix_rigid_1 axl_122  f 0.001   
    constr fix_rigid_1 axl_111  p 0.000   
    constr fix_rigid_1 axl_112  p 0.000   
    constr fix_rigid_1 axl_121  p 0.000   
    constr fix_rigid_1 axl_122  p 0.000   
  

  
  
• Perform a quasistatic analysis in program QUASI or TSIM.
  
  
• The results can be obtained by checking the *.gp-file by the program CATA_GP.
  Example: A printout from the CATA_GP program:
  (The information has been truncated in order to only view the most interesting variables).

                                                                                  
   Start  of  program  CATA_GP rel.9703                                           
   ====================================                                           
                                                                                  
   ident   =  qroll                                                               
                                                                                  
   head    =  Example of a Bobo-vehicle running at a speed of = 160. (km/h)       
              Wheel/rail geometry function cylindrical  friction= .000            
              Ideal track geom=Tangent_Track; Track irregularities=ideal          
              Calculation of roll-coefficient                                     
                                                                                  
   date    =  1997-09-24                                                          
                                                                                  
    freedom                     value                                             
   car_1.x                    0.00000E+00                                         
   car_1.y                    1.51493E-03                                         
   car_1.z                   -7.37960E-07                                         
   car_1.f                    1.10006E-03                                         
   car_1.k                    0.00000E+00                                         
   car_1.p                    0.00000E+00                                         
   bog_11.x                   0.00000E+00                                         
   bog_11.y                   5.00033E-05                                         
   bog_11.z                   0.00000E+00                                         
   bog_11.f                   1.04707E-03                                         
   bog_11.k                   2.38676E-08                                         
   bog_11.p                   0.00000E+00                                         
   bog_12.x                   0.00000E+00                                         
   bog_12.y                   5.00033E-05                                         
   bog_12.z                   0.00000E+00                                         
   bog_12.f                   1.04707E-03                                         
   bog_12.k                  -2.38625E-08                                         
   bog_12.p                   0.00000E+00                                         
                                                                                  
   EOF has been read                                                              
                                                                                  
    End    of  program  CATA_GP                                                   
    ===========================                                                   
                                                                                  
  

  
  
• The roll coefficient for a tilted vehicle on tangent track can be calculated according to the following formula:
  

  
    C_phi = phi_ks / phi_s - 1.
  
  

  
  Where:
  

  C_phi	=	The roll coefficient
  phi_ks	=	The roll angle of the carbody (car_1.f in the above example)
  phi_s	=	The roll angle of the axles (0.001 in the above example)