Standard Calculations

MiniProf for Windows offers the following set of standard calculations for the various profile types. The wheel, rail and brake wear apply only to wheel, rail and brake measurements, whereas the calculation of curvature, residuals and area operate on any type of profile.

Wheel wear
Calculates the flange thickness (Sd), flange height (Sh) and the flange gradient (qR) for the selected profile. Default values for the parameters are L1 = 2 mm, L2 = 70 mm and L3 = 10 mm.
Wheel flange radius
Calculates the radius of the wheel flange (R). Default value for the parameter is Dist = 20 mm.
Rail wear
This function will calculate the vertical (W1), horizontal (W2) and 45° (W3) wear. The wear is calculated as the difference between the measured profile and the reference profile. Default values for the parameters are A = 60° and L = 12 mm.
The side wear (W2) can be calculated either relative to the top of the reference or to the top of the measurement. Use the Side wear parameter in the calculation to select the preferred method.
Rail crown radius
The rail crown radius (R) is calculated as the radius of the circle that gives the best fit at the top of the rail head in an area determined by the Dist parameter. See Figure 8.4 below for definitions of parameters and results. Default values for the parameters are A = 45° and Dist = 10 mm.
Rail head width
The rail head width (W) is the distance from the field side of the rail head to the gauge side measured at L millimeters from the highest point of the rail profile. Setting the L parameter to 0 makes the calculation return the largest width. Default value for the parameter is L = 14 mm.
Brake wear
Calculates the brake-disc wear (W) and the remaining thickness (T).
Brake wear (No reference)
Calculates the brake-disc hollowing (W) and the remaining thickness (T).
Brake debending
Calculates a debended brake disc profile using either a circular or parabolic method. The parameters L1 and L2 defines the origin of the bend, where the bolt attaches the disc to the wheel. The calculation uses the top and/or the bottom edge of the disc to determine the amount of debending required. Default values for the parameters are L1 = 60 mm, L2 = 60 mm and T = 7 mm. Please note these parameters must be changed to match the actual disc, otherwise the calculation will not work correctly.
Length
Calculates the length of the selected profile by summing up the distances between the individual points, assuming that they are connected with straight lines. The length can by calculated for different parts of the profile by setting the Start and End parameters and placing either one or both cursors accordingly.
Angles
Calculates the tangent angle, measured in degrees, at each point of the selected profile. The angles for a reference profile are calculated and displayed along with the angles of the measured profile if a reference is selected.
Curvature
Calculates the curvature in every point of the current profile. The curvature (R) at a given point is found by fitting a 2nd degree polynomial to the profile in a limited range on each side of the point. The size of this range can be controlled through the Dist parameter and is by default set to 6 mm. After the curvature values are calculated, they are filtered using a simple average filter. The filter size is determined from the Average length parameter, default set to 3.
If a reference profile is available, the curvature will also be calculated for this and the result displayed as a reference for the curvature of the measurement.
Curvature is calculated when the profile is measured and stored with the profile coordinates. For older profiles, curvature is calculated automatically when these are loaded. If the profile is a mathematically defined reference (MPT file or imported DXF), the curvature will be exact, because the geometric features of this type of profile. Selecting the option True curvature will allow the software to use these pre-calculated values, and therefore show a more accurate curvature for references.
Residuals
Calculates at each point of the reference profile the distance (D) to the measured profile perpendicular to the reference profile. The calculation assumes that the points in the measured profile can be connected with straight lines.
The Reverse residuals option is available for compatibility reasons. It simply mirrors the residual values about the x-axis.
Vertical residuals
Calculates at each point of the reference profile the vertical distance (D) to the measured profile. The calculation assumes that the points in the measured profile can be connected with straight lines.
The Reverse residuals option is available for compatibility reasons. It simply mirrors the residual values about the x-axis.
Horizontal residuals
Calculates at each point of the reference profile the horizontal distance (D) to the measured profile. The calculation assumes that the points in the measured profile can be connected with straight lines.
The Reverse residuals option is available for compatibility reasons. It simply mirrors the residual values about the x-axis.
Maximum residuals
Calculates the maximum, minimum and average residual between the reference profile and the measured profile in a given area. This area is defined independently for wheel, rail and brake profiles as illustrated below. Default values for the parameters on wheels are D1 = 1 mm and D2 = 10 mm, on rails D1 = 10 mm and D2 = 30 mm and on brake discs D1 = 1 mm and D2 = 2 mm.
The Reverse residuals option is available for compatibility reasons. It simply reverse the sign on residual values.
Area
This calculation divides the area between the reference profile and the measured profile into a number of pieces (dA) and displays these areas relative to their position on the reference profile. The number of divisions is controlled by the length dL. Default value for the parameter is dL = 2 mm.
Furthermore, the calculation returns three simple values: Gained area: The sum of the areas lying outside the reference profile. Lost area: The sum of the areas lying inside the reference profile. Total area: Gained area minus Lost area.
Standard Alignments
16 alignments
Wheel Extentsions
21 calculations, 2 alignments
Rail Extentsions
8 calculations, 1 alignment
Brake Extentsions
2 calculations, 1 alignment
Equivalent Conicity
Contact analysis calculation
MiniProf for Windows
Version 2.43.74
EXE: 30.9 mb
Copyright© 1992-2018 · Greenwood Engineering A/S · All Rights Reserved

MiniProf is patented under the following patent numbers: 166972 in Denmark, 0569469 in Europe, 3154332 in Japan and 5351411 in USA.