Rail Deflection
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Presented by: Prof. Hannes Grabe at the 2009 Railways and Harbours Conference in Cape Town.
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Rail Deflection
- 1. Track Deflection Measurement using Particle Image Velocimetry Hannes Gr äbe University of Pretoria Chair in Railway Engineering
- 2. Definition ? What is an Engineer Someone who knows how to measure !
- 4. Dynamic loading on non-rigid track deflection
- 5. Deflection measurement: Field tests
- 6. Deflection measurement: Lab testing
- 11. Instrumentation ? What capabilities should instrumentation have Reliability 1. Optical 2. Mechanical 3. Hydraulic 4. Pneumatic 5. Electrical Simplicity Quality Cost!
- 12. Track loading & deflection Ballast Subballast Subgrade 1 Subgrade 2
- 14. MDD Installation
- 15. Field Instrumentation MDD module Load plate Soil sampling
- 16. MDD Results Time
- 17. Electrical: LVDT* * Linear Variable Differential Transducer
- 18. Electrical: LVDT* * Linear Variable Differential Transducer
- 19. Electrical: LVDT* * Linear Variable Differential Transducer
- 20. Mechanical: Sleeper deflection meter* * Design: Sakkie van der Linde
- 21. Mechanical: Geometry car measurements
- 22. Mechanical: Geometry car measurements Versine measurement Gauge measurement
- 23. Optical: Manual and digital level
- 24. Optic deflection measurement Particle Image Velocimetry (PIV) For optical track deflection measurement
- 26. Transnet Freight Rail PIV system
- 27. Target fixed to the rail
- 28. Target fixed to the rail * 2cm x 2cm square target
- 29. PIV Calibration
- 30. PIV System: Resolution * Standard deviation: 0.003 – 0.005mm
- 31. Applications of PIV Amandelbult Centurion Ermelo
- 32. Amandelbult
- 33. Amandelbult
- 36. Amandelbult test results 32km/h 7km/h
- 39. Centurion station measurements Conventional track Tubular track
- 40. Centurion measurements Tubular Track: Platform 2 (Rail & Beam deflection) -2.0 -1.5 -1.0 -0.5 0.0 0.5 0.0 2.0 4.0 6.0 8.0 10.0 12.0 Time (s) Deflection (mm) Rail Beam
- 41. Centurion measurements Tubular and Conventional Track Comparison -2.0 -1.5 -1.0 -0.5 0.0 0.5 0.0 2.0 4.0 6.0 8.0 10.0 12.0 Time (s) Deflection (mm) Tubular Conventional
- 42. Ermelo Yard
- 43. Eremlo Yard
- 44. Ermelo Yard PIV measurements
- 45. Ermelo Yard PIV measurements
- 46. Ermelo Yard PIV measurements
- 47. PIV measurements Ermelo: Rail , Beam , Grout , Formation Deflection -3.5 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 30 35 40 45 50 55 Time (s) Deflection (mm)
- 48. Tubular vs. Conventional turnout
- 49. Comparative analysis A: End-of-beam C: End-of-beam B: Mid-beam
- 50. End of beam deflection: Position B A B C
- 54. Questions… Thank you for your attention!