1 / 23

Chapter 28

Chapter 28. Track-Train Dynamics. Problem Lateral Forces High Center of Gravity Cars Vertical Forces Loaded and Empty Cars. Lateral Phenomena. Types of Lateral Movement Lateral Bending and Bending Stress Lateral Movement Tilt or Twist. Train Action Derailment Wheel Climbing

tondreau
Download Presentation

Chapter 28

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 28 Track-Train Dynamics

  2. Problem • Lateral Forces • High Center of Gravity Cars • Vertical Forces • Loaded and Empty Cars

  3. Lateral Phenomena • Types of Lateral Movement • Lateral Bending and Bending Stress • Lateral Movement • Tilt or Twist

  4. Train Action • Derailment • Wheel Climbing • Rail Overturning • Brake Action – assumes status of a long and flexible beam in compression, a relatively unstable state • Quick take-up of slack in a long train can also exert lateral pressure

  5. Train Action (Cont’d) Reverse Curves “Chording” the Curve Truck Hunting

  6. Derailment Causes • Operating Error (Transportation) • Mechanical Error (Mechanical) • Track Error (Engineering) • Or a Combination of Above ~ Conduct Root Cause Analysis ~

  7. L/V Ratio • Ratio of the lateral component to the vertical component of the wheel load. • As ratio increases, tendency to derail increases

  8. Lateral Slip

  9. Track Design Factors • Load Application • Ballast Section Design • L/V Track Restraint Ratio

  10. Train Forces

  11. Problems from Modern Cars • Car Weight

  12. Rock and Roll

  13. Rock & Roll • More prevalent on jointed track • Joints every 19.5 feet – induced oscillation • Car body springs have natural frequency of oscillation • At speeds between 12 and 20 mph frequencies are additive • If square joints – bounce • Solutions: • Don’t set sustained speed limits between 12-20 mph • Use snubbing devices on cars • Use CWR

  14. Truck Hunting

  15. Long Cars

  16. Transportation Technology Center • Pueblo, Colorado • Test Tracks and Other Research Facilities

More Related