Vehicle stability and dynamics longer combination vehicles final report

758387296Final report; Jan. Sept. 2011.PDFTech ReportNTRCI-50-2011-025RITA Grant-DTRT06G-0043Commercial vehiclesStability (Mechanics)Combination carriersStructural equation modelingHeavy duty vehiclesHeavy duty trucksUndersteerOfftrackingMotor vehicle dynamicsTennesseeNational Transportation Research Center, Incorporated, University Transportation CenterPape, DougArant, MichaelBrock, WayneBroshears, EricChitwood, CalebColbert, JamesonHathaway, RichardKeil, MitchelLaClair, TimPatterson, JimPetrolino, JosephPittro, CollinSpezia, AnthonyWafer, DavidNational Transportation Research Center, Incorporated, University Transportation CenterUnited States. Dept. of Transportation. Research and Innovative Technology AdministrationNTL-FREIGHT-Trucking IndustryNTL-SAFETY AND SECURITY-AccidentsNTL-SAFETY AND SECURITY-Highway SafetyNTL-SAFETY AND SECURITY-Vehicle DesignUS Transportation CollectionThis study investigated the safety and stability of longer combination vehicles (LCVs), in particular a triple trailer combination behind a commercial tractor, which has more complicated dynamics than the more common tractor in combination with a single semitrailer. The goal was to measure and model the behavior of LCVs in simple maneuvers. Example maneuvers tested and modeled were single and double lane changes, a gradual lane change, and a constant radius curve.In addition to test track data collection and a brief highway test, two computer models of LCVs were developed. One model is based on TruckSim\uc2\uae17. Key Word , a lumped parameter model widely used for single semitrailer combinations. The other model was built in Adams software, which more explicitly models the geometry of the components of the vehicle, in terms of compliant structural members. Among other results, the models were able to duplicate the experimentally measured rearward amplification behavior that is characteristic of multi-unit combination vehicles