Simulated loading and vehicle emulator (SLAVE)

SLAVE is the focal point of CAPTIF operations. Its primary function is to apply various wheel loadings to the test pavement sections in a controlled manner.

• Operates continuously for long periods unattended. Safety features automatically stop the rig in case of pavement or machine failure.
• Runs at speeds from 5–50km/h, programmable in 1km/h increments.
• Applies realistic dynamic loads and tractive forces to a test pavement at a high rate (up to 20,000 revolutions in 24 hours).
• The geometry of each vehicle can be adjusted in terms of wheel camber and toe-in.
• Distributes the loads over the test pavement to any userdefined pattern, programmable in 1cm increments over 1m of transverse travel. The trafficking distribution can be configured so that each unit travels in a separate wheelpath.
• Employs trapezoidal leaf, parabolic leaf or air bag suspensions in each of the two vehicles. Either dual or single wheels can be fitted.
• Able to carry a wide range of data acquisition equipment and can transmit data, such as dynamic vehicle loads and axle movements, while in motion.
• Carries static loads from 21kN to 60kN, in 2.75kN increments, on each vehicle.
• A 50kW electric motor drives a hydraulic pump which powers a hydraulic motor in each SLAVE unit. The electricity for the electric motor is transferred to the central pedestal through slip rigs at the base of the pedestal.
• The rig is controlled by an industrial programmable logic control (PLC) unit mounted in the central of the rig. The PLC unit is controlled by a computer in the control room. The computer and PLC communicate with each other using WiFi.

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