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Effects of Anti-Sway Bar Separation on the Handling Characteristics of a SUV
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 06, 2021 by SAE International in United States
Event: SAE WCX Digital Summit
A crash of an SUV led to the study of the failure of the anti-sway bar on the handling characteristics of the vehicle. The SUV, having been involved in a single vehicle rollover, was found with the anti-sway bar disconnected from the suspension assembly. The question arose whether the anti-sway bar disconnect was the cause of the accident. A procedure for evaluating the understeer and oversteer characteristics as specified by SAE J266 were evaluated. Testing included subjecting an exemplar SUV to a constant radius, increasing speed maneuver, as well as, single and double lane changes. Additionally, the characteristics of the handling of the SUV was also evaluated relative to low tire pressure on the rear tires. After the crash, the tire pressure for the subject vehicle measured above the specified value by the SUV manufacturer on the front tires; however, the rear tires were deflated to roughly half of the SUV manufacturer’s recommended pressure. Thus, the exemplar SUV was tested with the recommended pressure on both the front and rear tires with the anti-sway bar connected and then disconnected; moreover, these tests were repeated with the front tires at the recommended pressure and the rear tires at half of the recommend tire pressure according to the SUV manufacturer. From the results of these studies, conclusions with facts of the accident were determined.