Tractor-trailer rollover due to high crosswinds is a well recognized accident type. Some highway jurisdictions limit high-profile vehicle travel under certain weather conditions in certain locations to reduce the probability of rollover or other loss of control. The criteria for these travel limitations appear to be based upon analyses of very simple vehicle models. A tractor with a single trailer is studied to determine critical lateral wind speeds for windward wheel lift-off. Empty or lightly-loaded trailers are expected to be most susceptible to rollover or dangerous lane excursions due to lateral wind loads, so the analysis presented utilizes an empty trailer. The present paper examines the rollover potential of tractor-trailers in high crosswinds utilizing a sophisticated dynamic multi-mass vehicle model. This model was developed to study handling and collisions and includes the capability to account for aerodynamic forces. Parameters studied include vehicle speed, wind speed and aerodynamic coefficients. Roadway cross-slope was fixed, as were vehicle properties. No low-coefficient road surfaces are included. In this Paper a rather sophisticated tractor-trailer model is utilized. The simulation model is SIMON (Simulation MOdel Non-linear), part of the Engineering Dynamics Corporation HVE suite of analysis programs. This model includes, in addition to the six equations of motion for each mass, two degrees of freedom for each wheel or dual pair, with suspension and tire compliance. Driver input is represented by steer, throttle and brake tables in the time domain.
Tractor-trailer response to high crosswinds; static computations and dynamic simulations
2007
9 Seiten, 8 Bilder, 21 Quellen
Conference paper
English
Tractor-trailer Response to High Crosswinds; Static Computations and Dynamic Simulations
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