Testing components, innovative solutions and control strategies is essential to increase performances, optimize efficiency and ensure a proper safety level of a railway vehicle. These tests are usually performed directly on line, thus being very expansive and not repetitive since the boundary conditions may not be controlled. To reduce costs and save time during the testing/analysis phase, the use of dedicated test rigs is increasing. Specifically, roller rigs, full size and scale, are being used by researchers and railway organizations worldwide to assist in understanding of the behaviour of railway vehicles and the development of faster, safer and more efficient railways. The present paper focuses on a roller rig for testing full scale locomotives/wagons, which is located at the Osmannoro Centre of Experimental Dynamics. The considered roller rig allows to test vehicles having up to 6 axes and 3 bogies. Each axle-module is constituted by two 950 kW electric motor (one per wheel), wheel/roller speed sensors, dynamometric load cells allowing measurements of wheel-roller contact forces and driving torques. Aim of the roller rig is to verify traction systems of locomotives up to 6 axes, to test anti-slip/anti-skid control systems, to identify braking performance and to perform electromagnetic tests (radiated emissions and immunity) on the locomotive. At present, the design of the control strategy allowing to perform the desired tests is under development. To account for roller rig and vehicle dynamics at a design stage, a numerical model of the complete test bench (including the locomotive/wagon, the roller rig, the corresponding control systems) was developed and interfaced with the control strategy of the test bench. The present paper describes the simulation tool developed on the purpose. It is constituted of a mathematical model of the test bench, which includes a multi-body representation of the locomotive/wagon and a lumped-parameters schematization of the driveline and of the roller rig. To accurately model the test bench dynamics in a dedicated environment (MatLab/Simulink) and develop/verify the control logic actually present on the test bench (based on NI hardware and thus developed using Labview), co-simulation technique was applied. At any time step inputs/outputs (representing measurements on the test rig and control actions, respectively) are exchanged between the test bench numerical model and the control strategy, and thus the two simulation environments. Results of simulations performed to assess effectiveness of the roller rig control logic are shown in the paper.

Development of a mathematical model to design the control system of a full scale railway vehicle roller rig

CHELI, FEDERICO;RESTA, FERRUCCIO;SABBIONI, EDOARDO;TARSITANO, DAVIDE;
2016

Abstract

Testing components, innovative solutions and control strategies is essential to increase performances, optimize efficiency and ensure a proper safety level of a railway vehicle. These tests are usually performed directly on line, thus being very expansive and not repetitive since the boundary conditions may not be controlled. To reduce costs and save time during the testing/analysis phase, the use of dedicated test rigs is increasing. Specifically, roller rigs, full size and scale, are being used by researchers and railway organizations worldwide to assist in understanding of the behaviour of railway vehicles and the development of faster, safer and more efficient railways. The present paper focuses on a roller rig for testing full scale locomotives/wagons, which is located at the Osmannoro Centre of Experimental Dynamics. The considered roller rig allows to test vehicles having up to 6 axes and 3 bogies. Each axle-module is constituted by two 950 kW electric motor (one per wheel), wheel/roller speed sensors, dynamometric load cells allowing measurements of wheel-roller contact forces and driving torques. Aim of the roller rig is to verify traction systems of locomotives up to 6 axes, to test anti-slip/anti-skid control systems, to identify braking performance and to perform electromagnetic tests (radiated emissions and immunity) on the locomotive. At present, the design of the control strategy allowing to perform the desired tests is under development. To account for roller rig and vehicle dynamics at a design stage, a numerical model of the complete test bench (including the locomotive/wagon, the roller rig, the corresponding control systems) was developed and interfaced with the control strategy of the test bench. The present paper describes the simulation tool developed on the purpose. It is constituted of a mathematical model of the test bench, which includes a multi-body representation of the locomotive/wagon and a lumped-parameters schematization of the driveline and of the roller rig. To accurately model the test bench dynamics in a dedicated environment (MatLab/Simulink) and develop/verify the control logic actually present on the test bench (based on NI hardware and thus developed using Labview), co-simulation technique was applied. At any time step inputs/outputs (representing measurements on the test rig and control actions, respectively) are exchanged between the test bench numerical model and the control strategy, and thus the two simulation environments. Results of simulations performed to assess effectiveness of the roller rig control logic are shown in the paper.
Proc. of 11th World Congress on Railway Research (WCRR)
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/995704
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