Validation of a Mathematical Model that Studies the Critical Steering Angle for a Lateral Rollover on a Baja SAE Vehicle Centro Universitário da FEI

Format:

Conference/Event

Author/Creator:

Amaral, Amaral, author.

Contributor:

Neto, Carlos R. S.

Conference Name:

SAE Brasil 2011 Congress and Exhibit (2011-10-04 : Sao Paulo, Brazil)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

Information related to the vehicle's dynamics behavior havea huge importance on several subjects, safety is certainly one ofthem. For the purpose of improving the knowledge about the lateralrollover limit of a vehicle, under a steady state condition, anexperiment was made aiming to evaluate the lateral accelerationgain in function of the steering angle established for severalturning radiuses and speeds and with that, verify if thisacceleration gain causes the rollover situation, identifying thecritical level of steering angle.To accomplish that, the experimental analysis were performed ona Baja SAE vehicle, designed and built by students from CentroUniversitário da FEI. For the field tests, the vehicle was preparedwith a fifth lateral wheel system, which avoids the completerollover of the vehicle, ensuring the driver's safety. Tomeasure the wheel's steering angle, vehicle's speed and themoment when the first wheel leaves the ground, a data logger systemwas properly installed on the vehicle.This study also seeks to obtain the validation of themathematical model introduced by Gillespie who describes thismovement. Due to this, the understeer gradients had to becalculated, inasmuch as they change according to radius, speed,wheel camber, roll of the suspended mass, and other situations. Forthe cinematic analysis of the vehicle's suspension geometry,the ADAMS CAR software was used.A comparative analysis presents similar values between theresults obtained with the mathematical model, developed with theMATLAB software, and the results from the field tests, validatingthus the purposed equations

Notes:

Vendor supplied data

Publisher Number:

2011-36-0186

Access Restriction:

Restricted for use by site license