In this paper, the effect of moving liquid cargo on the braking performance of a tractor-tanksemi- trailer is investigated. For a partially filled modified oval tank, subjected to straight-line decelerations, the free surface slope of the liquid cargo has been calculated using a steady state liquid cargo model. After this stage, an iterative procedure using the 3D modelling tool of the AutoCAD software has been made to calculate the location of the cargo centre of gravity. Different fill and deceleration levels have been taken into consideration. The results are then fed to a pitch plane brake model of the tank vehicle in which the braking dynamics are simulated considering optimum brake force distributions The equations of motion of the simulation model are solved using PC MATLAB software . It has been found that both the tank fill level and the liquid cargo density have significant effect on the normal loads of vehicle axles during braking manoeuvres. For this reason a proposed brake control strategy for predicting optimum brake forces distribution, based on the vehicle's loading and operating conditions, has been presented. Comparisons between the braking characteristics of rigid and liquid cargo vehicles have been made considering optimum brake force distributions. The results showed that articulated liquid cargo trucks require special software and hardware to implement an accurately controllable braking system.
An investigation into brake system design and safety of articulated tank vehicles
2004
14 Seiten, 5 Bilder, 2 Tabellen, 14 Quellen
Aufsatz (Konferenz)
Englisch
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