Standard Alignments

MiniProf for Windows offers the standard alignments described below. As for the calculations, the wheel alignment only applies to wheel profiles, rail alignments to rail profiles and so forth.

	Align wheel Aligns a measured wheel profile to a reference on the flange back and outer thread. The alignment works by finding an area on the flange back using a line at a given slope (A). The measurement is moved so the center of these areas overlay each other. A similar area is then found on the outer thread and made to overlay by rotating the measurement about the point found on the flange back. This procedure is repeated upto 10 times to ensure the best posible fit between measurement and references. Default values for parameters are: A = 45°, D1 = 5 mm, D2 = 5 mm and L = 10 mm. Align wheel on flange top Aligns a measured wheel profile to the reference profile at the top of the flange. This alignment only moves the profile in the vertical direction. No rotation is performed. Align wheel on taperline Aligns a measured wheel profile so the profile intersects the horizontal axis at the taperline. This alignment only moves the profile in the vertical direction. No rotation is performed. Align wheel on flange back Aligns a measured wheel profile to the reference profile on the flange back. This alignment only moves the profile. No rotation is performed. Align wheel on outer thread Aligns a measured wheel profile to the reference profile on the outer thread. This alignment only moves the profile. No rotation is performed. Align rail Aligns a measured rail profile against a reference by moving the measurement so that the lines tp and tr are placed over each other. The displacement is determined as the distance between the intersection of tp and ctp and the intersection of tr and ctr. The rotation is found as the differences between the angles a and b. Default value for the parameter is A = 60°. Because the basic part in the alignment algorithm changes the tp line and thereby the intersection point used for moving the measurement, this procedure is repeated upto 10 times to ensure the best posible fit between measurement and reference. The rail alignment can be configured to use the right side of the profiles, if such is preferable, by setting the Corner property to Right instead of Left. In addition, the alignment can be made as a combination of both sides, using the mean value of the displacement and the rotation. Sometimes it is undesirable to both move and rotate the profile when aligning. This is controlled through the Operation property. Select Move only to skip the rotation and Rotate only to skip the movement. Align rail centered Aligns a measured rail profile against a reference, by rotating the profile so the line tm, which mirrors tl into tr, is vertical. The rotation is found as the difference between the angles a and b. The measured profile is then moved so that the point pp overlays the same point on the reference.		Align rail (CEN) Aligns a measured rail profile against a reference by moving the measurement so it intersects the reference in the two points pt and pg. The precision parameter controls the accuracy of the alignment by setting the largest allowed mismatch between the pg point and the measured profile. No rotation is performed on the measured profile. Default values for the parameters are L = 14 mm and Precision = 0.1 mm. Align rail on wear Aligns a measured rail profile against a reference so that the wear parameters W1 and W3 are minimized. No rotation is performed on the measured profile. Default value for the parameter is A = 45°. Align rail for grinding (Low) Aligns a measured rail profile against a reference profile according to the CEN grinding standard (prEN 13231-3) for tangent track and the low rail in curves. No rotation is performed on the measured profile. Default values for the parameters are: A = 2.86° and L = 14 mm. Align rail for grinding (High) Aligns a measured rail profile against a reference profile according to the CEN grinding standard (prEN 13231-3) for the high rail in curves. No rotation is performed on the measured profile. Default values for the parameters are: A1 = 2.86° and A2 = 45°. Align rail on top Aligns a measured rail profile so the profile intersects the horizontal axis at the top point. This alignment only moves the profile in the vertical direction. No rotation is performed. Align grooved rail Aligns a measured grooved rail profile against a reference by moving the measurement so that the l line on the measurement is placed over the corresponding line on the reference. The displacement is determined as the distance between the point pb on the measurement and the similar one on the reference, and the rotation as the difference between the a angles. Default value for the parameter is A = 5°. Sometimes it is undesirable to both move and rotate the profile when aligning. This is controlled through the Operation property. Select Move only to skip the rotation and Rotate only to skip the movement. Align brake on top edge Aligns a measured brake profile on the top edge so this edge overlays the horizontal axis. This alignment only moves the profile in the vertical direction. No rotation is performed. Align brake on scale Aligns a measured brake profile against the reference by stretching the measured profile vertically so the height Hm matches the height of the reference (Hr). This alignment only scales the profile in the vertical direction. No movement or rotation is performed.			Standard Calculations 16 calculations Wheel Extentsions 19 calculations, 2 alignments Rail Extentsions 8 calculations, 1 alignment Brake Extentsions 2 calculations, 1 alignment Equivalent Conicity Contact analysis calculation MiniProf for Windows Version 2.43.73 EXE: 30.8 mb