Statistical analysis of heavy vehicle operating speed in ascending slopes
DOI:
https://doi.org/10.4067/S0718-28132015000200001Keywords:
Operating speed, Heavy vehicle, Ascending slopeAbstract
The truck speed profiles in ascending slopes are used to design climbing lanes. The standards consider a vehicle with typical weight-to-power ratio, uniform slopes up to 8% and slope lengths of 12 km. The speed profile is obtained equating the forces opposed to the movement and the forces provided by the truck engine. Experiments conducted in Germany show that the actual speed profiles are different from that of theoretical speed profiles. Therefore, it is relevant to study in the field the truck speed behaviour in ascending slopes. This paper presents an empirical study of truck speed profiles in ascending slopes. The study characterizes and compares measured speed profiles with a theoretical model used in the Chilean geometric design standards. A set of 24 test sections, with slopes between 2% and 13% and lengths between 0.2 and 2.4 km were used. 70 speed profiles using a kinematic GPS device were obtained. Data were corrected using the Kalman filter and smoothed using non-parametric regression to obtain continuous speed profiles. The entrance speed, the maximum and minimum speed and the shape of the speed profiles were statistically analysed as well as the relationship between these parameters and the parameters used in the Chilean standard. It is concluded that the theoretical model overestimates the speed reduction in the first part of the slope, it does not consider the acceleration at the end of the slope and that the trucks not always reduce the speed up to the crawl speed.
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