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Users Manual for Program TRC_FOURPL  

Table of Contents

Introduction

Program TRC_FOURPL calculates the Fourier series for the different track irregularities. The user can choose between three different types of spectra: real, imaginary and complex absolute value. The input data track should be written in format TRAC or TRAX.

Input data commands

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.

INFIL

Name of the input TRAC- or TRAX-file.
Declared = Character*132    Default = Blank

PAGE

Enters the definition of a new page. Up to two curves per page can be drawn. Command PAGE can be given 2 or 4 arguments. The valid commands are the following:

Arg(1)=	Type of signal, curve 1.
Arg(2)=	Mode of signal, curve 1.
Arg(3)=	Type of signal, curve 2.
Arg(4)=	Mode of signal, curve 2.

Type of signal can be one of: lat, vert, spv or rfh.
Mode of signal can be one of: real, imag or abs.
If only 2 arguments are given under command PAGE only one curve will be drawn.
The command lacks default-values.

XAXIS

Type of X-axle

LIN	=	linear scale.
LOG10	=	logarithmic scale, base 10.
VFREQ	=	angular frequency scale, 2*π/L.
VFLOG	=	logarithmic angular frequency scale.

Declared= Character*5    Default = 'LIN'

XMIN

The lowest value of the X-axle.
Declared= Real*4    Default = 0.

XSKALA

Scale the X-axis of the curve.
When plotting in a linear scale XSKALA should be defined as units per [cm]. When plotting in logarithmic scale XSKALA should be defined as units raised to the power of ten per [cm].
Declared= Real*4    Default= 10.

YAXIS

Type of Y-axle

LIN	=	linear scale.
LOG10	=	logarithmic scale, base 10.

Declared= Character*5    Default = 'LIN'

YMIN

The lowest value of the Y-axle.
Declared= Real*4    Default = 0.

YSKALA

Scale the Y-axis of the curve.
When plotting in a linear scale YSKALA should be defined as units per [cm]. When plotting in logarithmic scale YSKALA should be defined as units raised to the power of ten per [cm].
Declared= Real*4    Default= 10.

Example of an input data file

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

                                                               
 ##                                                            
 ##       Input data file for program Trc_fourpl               
 ##                                                            
                                                               
  IDENT1= A plot created in GENSYS by program TRC_FOURPL       
  IDENT2= The Fourier series of the track irregularities       
  IDENT3= INFIL ver_data/hysl_rak.trac                         
                                                               
  INFIL = $gentrc/K0_4a21-n-k.trac                             
                                                               
  XAXIS = VFLOG  XMIN= 3.   XSKALA= .076                       
  YAXIS = LIN    YMIN= 0.   YSKALA= .5                         
                                                               
  ISCREN= 0                                                    
  ILASER= 6   POSTFI= diags/trc_fourpl.ps                      
                                                               
  PAGE   lat  abs   spv  abs                                   
  PAGE   vert abs   rfh  abs                                   
  PAGE   lat  real  lat  imag