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Users Manual for Program TRC_STRIX_TRACK2





Table of Contents

   Introduction
   Calculation procedure
   Input data commands
   Examples



sketches/Inertia_based_measurement.png

Introduction

Program TRC_STRIX_TRACK2 transforms files recorded by the STRIX-recording car into files written in trax_wdesign-format. The recording system in STRIX is an inertia based recording system. The format of the STRIX-recordings shall be of type SPL.



Calculation procedure


Gauge irregularities


Vertical irregularities


Cant irregularities


Lateral irregularities


Designed track curvature


Designed cant angle


Designed vertical lift of track center line


Input data

Input data is read in free format, valid separators between the input values are <space>, <comma>, <tab>, <equal sign> or <carriage return>. The commands can be written both in lower and upper case letters. The operation of the program is controlled by the commands described below; some of the commands also need arguments.


CALC_QN
Activate the calculation of QN-numbers according to UIC 518.
Program TRC_QNUMB_TRACK is used for the calulation of the QN-numbers.
Declared= Character*3    Default= yes

CREATE_PLOT
Activate the generation of plots.
Declared= Character*3    Default= yes

DX
Equidistant step between the points written to RESFIL.
Declared= Real*4    Default= Same step as read from file LATFIL

FILTER_SHORT_WAVES
Activate the filtering of short waves.
Declared= Character*3    Default= yes

INFIL
Track irregularity file from track recording car STRIX.
The file format is defined in command TYPE_INFIL.
Declared= Character*132    Default= Blank

L_CURVE_WAVES
Low pass filter cut-off wave-length for curvature.
Declared= Real*4    Default= 50 [m]

N_CURVE_WAVES
Order of the curvature low pass filter.
The filter is of type Butterworth in two stages. First forward filtering then backward filtering. This type of filtering avoids different delays for different waves. N_CURVE_WAVES must be an even number.
Declared= Integer*4    Default= 8

L_CANT_WAVES
Filter separating designed cant and cant errors.
Declared= Real*4    Default= 100 [m]

N_CANT_WAVES
Order of the cant separating filter.
The filter is of type Butterworth in two stages. First forward filtering then backward filtering. This type of filtering avoids different delays for different waves. N_CANT_WAVES must be an even number.
Declared= Integer*4    Default= 4

L_LATERAL_WAVES
High pass filter cut-off frequency for lateral track irregularities.
Track irregularities of very low frequencies can be measured in the STRIX track measuring car. However too long waves in the lateral track irregularities are not of interest, if the track is going to be used for estimation of ride comfort and lateral track forces only.
Declared= Real*4    Default= 125 [m]

N_LATERAL_WAVES
Order of the lateral high pass filter.
The filter is of type Butterworth in two stages. First forward filtering then backward filtering. This type of filtering avoids different delays for different waves. N_LATERAL_WAVES must be an even number.
Declared= Integer*4    Default= 8

L_SHORT_WAVES
Low pass filter cut-off frequency.
Track irregularities of very high frequencies can be measured in the STRIX track measuring car. However too short waves in the track are not of interest, if the track is going to be used for estimation of ride comfort and lateral track forces only. The short waves makes simulation times longer, because the integrate needs to make smaller time-steps.
Declared= Real*4    Default= 2.5 [m]

N_SHORT_WAVES
Order of the low pass filter.
The filter is of type Butterworth in two stages. First forward filtering then backward filtering. This type of filtering avoids different delays for different wave lengths. N_SHORT_WAVES must be an even number.
Declared= Integer*4    Default= 2

UTFIL
Result file written in TRAX_WDESIGN-format.
Declared= Character*132    Default= trc_strix_track_UTFIL.trax_wdesign

REMOVE_UCAT_WORK
Command which controls if the working directory "ucat_work" should be removed or not after the calculation.
Declared= Character*4    Default= 'NO'

SCALE_CANT
Scale factor for cant. This input data is for historical reasons. SPL-files before 2004-10-28 had a positive rotation to the left.
Declared= Real*4    Default= +1.

SCALE_CURVE
Scale factor which transforms column 20) in the SPL-file into curvature in meters. This input data is for historical reasons, when the curvature was expressed as filtered through the Mauzin measuring car.
Declared= Real*4    Default= +1.

TYPE_INFIL
Defines the file format of file INFIL.
Valid values are SPL and OPTRAM.
Declared= Character*6    Default= "SPL"

XSTART_KM
Defines the first kilometer from where the translation shall begin.
Declared= Integer*4    Default= 0

XSTART_M
Defines the meter within the first kilometer from where the translation shall begin.
Declared= Integer*4    Default= 0

XSTOP_KM
Defines the last kilometer where the translation shall end.
Declared= Integer*4    Default= 2147483647   = (231-1)

XSTOP_M
Defines the meter within the last kilometer where the translation shall end.
Declared= Integer*4    Default= 0


Example:

Following example: Master.trc_strix_track2f can be used as a master file:

##
##      Input data for program TRC_STRIX_TRACK2
##

  INFIL= STRIX.SPL
#
  SCALE_CURVE=  1.
#
  REMOVE_UCAT_WORK= no
#
  XSTART_KM= -1e6   XSTART_M=    0
  XSTOP_KM =  1e6   XSTOP_M = 1000
#
  DX= 0.5               # Equdistant steps in the track output data file UTFIL
#
  L_LATERAL_WAVES= 125. # Filter the lateral track irregularities through a high pass 
  N_LATERAL_WAVES= 8    # filter, in order to remove very long waves
#
  FILTER_SHORT_WAVES= yes
  L_SHORT_WAVES=  2.5   # Filter the irregularities through a lowpass filter
  N_SHORT_WAVES=  2     # in order to remove short waves
#
  CALC_QN    = yes
  CREATE_PLOT= yes
#
  UTFIL= transl_track.trax_wdesign