DEVELOPMENT OF METHODS FOR PREDICTING AIRLOADS ON TACV CONFIGURATIONS DUE TO STRONG CROSSWIND GUSTS

Equations for predicting the transient side force and yawing moment on TACV cars due to a strong side gust are developed. The protection afforded by side rails is estimated. The equations account for transient slender-body effects and growth of vortices on the lee side. For a vehicle speed of 150 mph, the analysis indicates a side gust of 60 mph would produce a transient peak in side force of 1x the steady-state value for the first car to 4.3x for the third car. An unresolved uncertainty of a factor of two in predicting the steady-state side force on TACV models in wind-tunnel tests with a moving ground plane is attributed to flow effects between the vehicle bottom and the ground plane. Because of questions regarding ground-plane simulation in wind-tunnel tests, effect of side rails on gust airloads, and the airloads due to passing trains, the feasibility of developing a facility for measuring forces and moments on moving models is explored. (Modified author abstract)

  • Corporate Authors:

    Kaman AviDyne

    Burlington, MA  USA  01803
  • Authors:
    • Ruetenik, J R
    • Zartarian, G
  • Publication Date: 1972-3-27

Media Info

  • Pagination: 106 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00056958
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: KA-TR-76
  • Contract Numbers: DOT-TSC-171
  • Files: NTIS, TRIS
  • Created Date: Jul 31 1974 12:00AM