EPE Association: EPE 1997 – 60: Dialogue Session DS5b-1: TRACTION

EPE 1997 – 60: Dialogue Session DS5b-1: TRACTION - LOCOMOTIVES
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 60: Dialogue Session DS5b-1: TRACTION - LOCOMOTIVES

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   A FUZZY WHEEL-RAIL ADHESION MODEL FOR RAIL TRACTION
By R.J. Hill; J.-F. de la Vassiere [View]
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Abstract: This paper describes a fuzzy identification model for a rail traction load simulator utilising the prediction of variables causing changes in the friction-creep curve. The model has fuzzy inputs corresponding to rail conditions (presence of water, sand, oil and solid debris) and crisp inputs for vehicle and wheel speed, weight and time. After calculation of reference values for the friction-creep curve parameters, the model makes adjustments according to the values of intermediate variables corresponding to contact pressure and creepage. The final friction-creep curve is obtained by interpolation. Results are presented of friction-creep curves under the influence of sudden changes in water, oil & sand contamination and train speed.

   NEXT GENERATION HIGH POWER LOCOMOTIVE CONVERTER OF 12X
By K.-H. Ketteler; J. Scheibengraf; R. Reichelt; U. Meyer [View]
[Download]

Abstract: The next generation modular power converter (MPC) for traction applications is presented. It is installed on the locomotive 12X as test carrier. This very promising IGBT technology will lead to a big step in terms of performance, modularity, reliability and overall cost reduction.

   DIGITAL REAL-TIME HARDWARE-IN-THE-LOOP SIMULATION FOR RAIL VEHICLES: A CASE STUDY
By Th. Keller; E. Scheiben; P. Terwiesch [View]
[Download]

Abstract: The present contribution presents the simulator topology, the simulation model and first results of a purely digital real-time hardware-in-the-loop simulation of a converter vehicle compared to an existing analog simulation. It shows the sensitivity of the accuracy versus the step time and the dead time of the simulator.

   IMPLEMENTATION OF AN ADVANCED WHEEL CREEP CONTROL WITH SEARCHING STRATEGY ON A LIGHT RAIL VEHICLE
By H. J. Schwartz; R. Krefic [View]
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Abstract: Due to sufficient CPU capacity of modern drive control systems an advanced wheel creep control could be tested on a low floor tram without additional hardware effort. The "C" software module is integrated into the existing software structure running on a MICAS-S® traction controller. Based on the fast torque control principle ISC a speed controller for each individual drive is installed. A searching strategy varies the reference speed in order to find the maximum of the available adhesion. On dry rails the wheel creep control remains in a supervision mode until the adhesion between wheel and rail decreases. By simulation tests of the original software module with Matlab/Simulink the commissioning time was very short. The wheel creep control is in daily operation in low floor trams with IGBT inverters powering both AC motors with hollow shaft drives and classic wheel sets and also AC hub motors providing single wheel drives.

EPE 1997 – 60: Dialogue Session DS5b-1: TRACTION - LOCOMOTIVES
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 60: Dialogue Session DS5b-1: TRACTION - LOCOMOTIVES
	[return to parent folder]

	A FUZZY WHEEL-RAIL ADHESION MODEL FOR RAIL TRACTION By R.J. Hill; J.-F. de la Vassiere	[View] [Download]
Abstract: This paper describes a fuzzy identification model for a rail traction load simulator utilising the prediction of variables causing changes in the friction-creep curve. The model has fuzzy inputs corresponding to rail conditions (presence of water, sand, oil and solid debris) and crisp inputs for vehicle and wheel speed, weight and time. After calculation of reference values for the friction-creep curve parameters, the model makes adjustments according to the values of intermediate variables corresponding to contact pressure and creepage. The final friction-creep curve is obtained by interpolation. Results are presented of friction-creep curves under the influence of sudden changes in water, oil & sand contamination and train speed.

	NEXT GENERATION HIGH POWER LOCOMOTIVE CONVERTER OF 12X By K.-H. Ketteler; J. Scheibengraf; R. Reichelt; U. Meyer	[View] [Download]
Abstract: The next generation modular power converter (MPC) for traction applications is presented. It is installed on the locomotive 12X as test carrier. This very promising IGBT technology will lead to a big step in terms of performance, modularity, reliability and overall cost reduction.

	DIGITAL REAL-TIME HARDWARE-IN-THE-LOOP SIMULATION FOR RAIL VEHICLES: A CASE STUDY By Th. Keller; E. Scheiben; P. Terwiesch	[View] [Download]
Abstract: The present contribution presents the simulator topology, the simulation model and first results of a purely digital real-time hardware-in-the-loop simulation of a converter vehicle compared to an existing analog simulation. It shows the sensitivity of the accuracy versus the step time and the dead time of the simulator.

	IMPLEMENTATION OF AN ADVANCED WHEEL CREEP CONTROL WITH SEARCHING STRATEGY ON A LIGHT RAIL VEHICLE By H. J. Schwartz; R. Krefic	[View] [Download]
Abstract: Due to sufficient CPU capacity of modern drive control systems an advanced wheel creep control could be tested on a low floor tram without additional hardware effort. The "C" software module is integrated into the existing software structure running on a MICAS-S® traction controller. Based on the fast torque control principle ISC a speed controller for each individual drive is installed. A searching strategy varies the reference speed in order to find the maximum of the available adhesion. On dry rails the wheel creep control remains in a supervision mode until the adhesion between wheel and rail decreases. By simulation tests of the original software module with Matlab/Simulink the commissioning time was very short. The wheel creep control is in daily operation in low floor trams with IGBT inverters powering both AC motors with hollow shaft drives and classic wheel sets and also AC hub motors providing single wheel drives.