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The model of the track in substructure file wr_coupl_nra1.ins is built up in a very similar way as the substructure file wr_coupl_nr1.ins. The main difference between wr_coupl_nr1.ins and wr_coupl_nra1.ins is that instead of using a lookup table as in file wr_coupl_nr1.ins, file wr_coupl_nra1.ins calculates the creep forces according to Kalker's simplified theory.
For further information about the substructure file wr_coupl_nra1.ins, please read the documentation for wr_coupl_nr1.ins
In addition to the required input data variable names in wr_coupl_nr1.ins above, substructure file wr_coupl_nra1.ins also requires the following variables:
|HV||=||Hardness in Vickers N/m2|
|Arch_speed_borders||=||Speeds, separating the different regions in the wear chart|
|Arch_press_borders||=||Pressures separating different regions of the wear chart|
|Arch_wear_coeff||=||Wear coefficients for the different wear regions in the wear chart|
In addition to the generated variable names in wr_coupl_nr1.ins above, substructure file wr_coupl_nra1.ins also generates the following variables:
|cpt_$2r.wArchH_#||=||Material wear [m**3/s] Hertz pressure, tread, right wheel in strip number #|
|cpt_$2r.wArchH||=||Total material wear [m**3/s] Hertz pressure, tread, right wheel|
|cpt_$2r.wArchS_#||=||Material wear [m**3/s] simplified pressure, tread, right wheel in strip number #|
|cpt_$2r.wArchS||=||Total material wear [m**3/s] simplified pressure, tread, right wheel|
The contact point can be divided in up to 40 strips.
The user can obtain the wear from each strip in the contact point.
The strip cpt_$2r.wArchH_1 is the first strip located at the most positive Y-coordinate,
that is valid for both the right and left wheel.
The last strip is located at the most negative Y-coordinate.
The total number of strips used is defined in the file $gensys/calc/insert_files/wr_coupl_nra1.ins.
The same naming convention has also been used on the wheels on the left hand side of the vehicle. The names of the variables on the left side can be created by changing "_$2r" to "_$2l".
If the wheel-rail geometry functions contain a separate description of the flange (two-point contact), an equal amount of variables as for the tread will be generated. The names of the variables will be the same as for the tread, just the introduction cpt_* will be changed to cpf_*.