Comparative Analysis Of Bus Rollover Protection
Under Existing Standards
Author(s)
C. C. Liang & L. G. Nam
Abstract
Both Europe and the United States (US) have enforced the legislations for bus
rollover protection: Regulation number 66 of the Economic Commission for
Europe (ECE R66) and standard number 220 of the American Federal Motor
Vehicle Safety Standards (FMVSS 220) in order to prevent catastrophic rollover
accidents. Therefore, this paper studied the legislation for bus rollover protection
including both ECE R66 and FMVSS 220. Satisfying the rollover requirements
by buses is obligatory by law. However, the scope of those two regulations does
overlap for some group of vehicles. Thus, this study firstly presents a physical
meaning comparative analysis of the ECE R66 with the FMVSS 220. The LSDYNA
971/MPP was used for numerical analysis. The analysis models were
constructed by the eta/FEMB that is a preprocessing module integrated in the
LS-DYNA 971 package. The validation was turned from experimental data of
body knots extracted from the real vehicle. This investigation performed the
comparative analysis following ECE R66 and FMVSS 220 assessments, then
moved to demonstrate the distortion configuration of the vehicle superstructure
through the absorbed energy and its distribution in the vehicle and the vehicle
frame sections, as well as the violation of the passenger compartment under the
rollover testing conditions of both ECE R66 and FMVSS 220. Great differences
were found between the rollover strength of bus superstructures depending on
which regulations are followed. The results also demonstrate that the passenger
compartment and residual space are more violated and more dangerous under the
lateral rollover testing condition of the ECE R66 than the other. Above findings
could be used for the automobile manufacturers in a new design of bus
Keywords
bus rollover, ECE R66, FMVSS 220, LS-DYNA
Related Book
Other papers in this volume
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