Title: A normalised measure of relative roll instability for open-loop rollover warning

Authors: Sandeep Kar, S. Rakheja, A.K.W. Ahmed

Addresses: Concave Research Center, Concordia University, 1455 de Maisonneuve West, Montreal, Quebec H3G 1M8, Canada. ' Concave Research Center, Concordia University, 1455 de Maisonneuve West, Montreal, Quebec H3G 1M8, Canada. ' Concave Research Center, Concordia University, 1455 de Maisonneuve West, Montreal, Quebec H3G 1M8, Canada

Abstract: A new measure, termed as Normalised Roll-response of Semitrailer Sprung Mass (NRSSM), based upon the normalised roll response of the sprung and unsprung masses through online monitoring of roll deflections, is identified and proposed as a superior measure of relative roll instability. The proposed NRSSM was found to be less sensitive to variations in design and operating conditions, while the measurability and lead-time performance of the metric were found to be superior when compared with the existing measures. The performance of this metric is analysed and a two-tier warning strategy, incorporating the NRSSM and the semitrailer lateral acceleration response, is proposed to enhance the reliability and lead-time of the warning strategy, while reducing the possibilities of false warnings.

Keywords: load transfer ratio; normalised roll response; warning strategy; rearward roll amplification; rollover; roll safety factor; rollover metrics; roll instability; heavy vehicles; open-loop rollover; intelligent vehicle systems.

DOI: 10.1504/IJHVS.2006.009118

International Journal of Heavy Vehicle Systems, 2006 Vol.13 No.1/2, pp.74 - 97

Published online: 02 Mar 2006 *

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