Transcription of Wheel‐Rail Interaction Fundamentals
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1 Wheel Rail Interaction FundamentalsKevin Oldknow, , Part 1 The Wheel / Rail Interface anatomy and Key Terminology The Contact Patch and Contact Pressures Creepage and Traction Forces Part 2 Vehicle Steering and Curving Forces Wear and Rolling Contact Fatigue Part 3 The Third Body Layer, Traction/Creepageand Friction Management Frequency Domain Phenomena: Noise and CorrugationsThis three part session will provide an introduction to several fundamental aspects of vehicle track Interaction at the wheel/rail interface3 Part 1 The Wheel / Rail Interface anatomy and Key Terminology The Contact Patch and Contact Pressures Creepageand Traction Forces4(Very) Basic Vehicle Running Gear anatomy Wheels Wheelsets Axleboxes Suspension Frame5(Very) Basic Track anatomy Rail Crossties (Sleepers) Tie Plates Fasteners / Spikes & Anchors Ballast Subballast Subgrade6 Tangent Curve Spiral High Rail Low Rail Superelevation(aka Cant) Rail CantRecalling a few track geometry Wheel / Rail Interface and Key TerminologyField SideGage SideBack of Flange (BoF)Flange FaceFlange RootAncillaryTreadGage FaceGage CornerMid GageBall / Crown / Top of Rail (TOR)Back to Back Wheel SpacingTrack Gage8 The Wheel / Rail Interface and Key Terminology ( Low Rail Contact)
– The Wheel / Rail Interface Anatomy and Key Terminology – The Contact Patch and Contact Pressures ... • Assuming a HAL vehicle weight (gross) of 286,000 lbs, we have a nominal wheel load of 35,750 lbs, i.e. 35.75 kips (159 kN) ...
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