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Discrete Dynamics in Nature and Society
Volume 2012 (2012), Article ID 350360, 16 pages
Research Article

Handling Stability of Tractor Semitrailer Based on Handling Diagram

1College of Computer Science and Technology, Jilin University, No. 2699 Qianjin Street, Changchun 130012, China
2Traffic College, Jilin University, No. 5988 Renmin Street, Changchun 130022, China

Received 9 May 2012; Revised 9 July 2012; Accepted 18 July 2012

Academic Editor: Wuhong Wang

Copyright © 2012 Ren Yuan-yuan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Handling instability is a serious threat to driving safety. In order to analyze the handling stability of a tractor semitrailer, a handling diagram can be used. In our research, considering the impact of multiple nonsteering rear axles and nonlinear characteristics of tires on vehicle handling stability, the handling equations are developed for description of stability of tractor semi-trailer. Then we obtain handling diagrams so as to study the influence of driving speed, loaded mass, and fifth wheel lead on vehicle handling stability. The analysis results show that the handling stability of a tractor semi-trailer when the tractor has two nonsteering rear axles is better than that when the tractor has only one nonsteering rear axle. While the stability in the former case is slightly influenced by driving speed and loaded mass, the latter is strongly influenced by both. The fifth wheel lead is found to only slightly influence handling stability for both tractor semi-trailers. Therefore, to ensure the driving safety of tractor semi-trailers when the tractor has only one nonsteering rear axle, much stricter restraints should be imposed on driving speed, and the loaded mass must not exceed the rated load of the trailer.