Système de contrôle de la pression des pneus (TPCS)
Coûts
Performance
Abstract
Les systèmes de contrôle de pression (TPCS) ou de gonflement central des pneus (CTI) deviennent de plus en plus populaires dans les opérations forestières canadiennnes comme moyen d'accroître la mobilité des camions grumiers et de prolonger la saison de transport. Cependant, il existe très peu d'information quant à leurs coûts de possession et de fonctionnement. FERIC a observé les systèmes TPCS Redline-Eltek et TPCS Eaton durant une période de trois ans. L'étude portait sur 24 camions grumiers de configurations variées, localisés dans six endroits différents de l'ouest du Canada. Le rapport présente les coûts de possession et de fonctionnement des systèms TPCS pour ces 24 camions et décrit comment le taux d'utilisation du camion affecte les coûts de possession du TPCS et du camion.
FPInnovations, in cooperation with Alberta Transportation and the Laval University i3C Chair, undertook a review of the starting threshold for initiating winter weight hauling in Alberta. The objective of this project was to conduct an engineering analysis of freezing pavements to determine the minimum frost depth at which log hauling at winter weight premiums (WWP) in Alberta could start without compromising pavement service life. The report describes literature on freezing pavement engineering, Canadian winter weight policies, a controlled trafficking simulation of an instrumented pavement as it was frozen, and subsequent modeling to valiidate results and extrapolate results ot a wider range of pavement structures. It was recommended that the current 1.0 m starting frost depth threshold be reduced to a depth of 700 mm.
The objectives of this study were to evaluate the tractive requirements of different configurations of log-hauling trucks and to recommend devices that will improve their tractive ability. Drawbar pull tests were conducted to determine the relative gradeabilities of a tandem drive-axle tractor configured with a pole, triaxle, and quadaxle trailer. The triaxle and quadaxle configurations require, respectively, 19 and 34% increases in tractive ability of they are to have gradeabilities equal to that of the pole-trailer configuration. Central tire inflation (CTI) and automatic slip regulation (ASR) are two promising devices for achieving such improvements.
Au Canada, la majeure partie du transport forestier doit passer sur les routes publiques au cours de leurs cycles de travail et ces camions interagissent donc avec les usagers de la route et subissent les risques inhérents à la conduite dans une circulation plus dense. Les caméras de bord sont un outil de sécurité relativement nouveau.
The classic ride model CR48 air-cushioned suspension for fifth-wheels was studied to determine its effects on fuel consumption saving, motion-induced vibrations, and load sway (trailer roll) when used on logging trucks in their actual working environment. Comparison of trips made by a tractor-trailer, on various road surfaces, both loaded and empty, with the air cushion inflated and deflated, shows overall improvements of 1 to 2% in the fuel consumption rate when inflated. Some positive effects on vibration levels were found on the tractor and trailer when loaded. Little improvement was found when empty. No detrimental effect on load sway was observed.
