United States Department of Transportation
i
Development of Methods for Predicting Airloads on TACV Configurations Due to Strong Crosswind Gusts
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1972-03-01
[PDF-7.21 MB]
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Abstract: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 inside force of lx 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 air loads, and the air loads due to passing trains, the feasibility of developing a facility for measuring forces and moments on moving models i.e. explored, it is concluded that a laboratory facility with a 25-30 ft track for testing 1-ft length models at 100 fps would provide useful data; principal development problems would be associated with model-support vibration and model balance measurement. A larger facility with a 120-140 ft. track for testing 4-5 ft. length models would provide good Reynolds -number simulation, readily met model guideway tolerance requirements and greater ease of measurement.
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