SAE 973261 Prediction of Steady State Roll Threshold for Loaded Flat Bed Trailers - Theory and Calculation
Roland L. Ruhl
University of Illinois at Urbana-Champaign
Roland A. Ruhl
Ruhl and Associates - Forensic, Inc.
The flexibility of flat bed trailers is shown to be an important consideration in determining the static roll threshold for a loaded Class 8 tractor trailer. The development of an easy to use static roll threshold model using Microsoft® Excel's nonlinear equation solution capability provides a tool that should be useful to the trailer designer, dock loading manager and the traffic safety manager responsible for the training of drivers. It can be seen for low stiffness flat bed trailers that the trailer torsional stiffness is a more important parameter that typical suspension or tire stiffness. Further, even for "stiff" flatbed trailers the use of the rigid body roll criteria (T/2h) or the 2-D "planar" model can produce significant error in many practical loading configurations.
Copyright 1997 Society of Automotive Engineers, Inc.
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