Lionginas Liudvinavičius

Electrodynamic braking in high‐speed rail transport

Abstract The paper considers electrodynamic braking of trains, which is of particular importance for high‐speed railway transport from theoretical and technical perspectives. Braking methods used for high‐speed trains should ensure compatibility and redundancy of braking systems. They include a mechanical method (based on adding frictional disks to wheelsets), as well as magnetic braking, which is being currently implemented and based on eddy currents, etc. High‐speed trains have AC/DC engines, for which the principles of electric braking can be applied. Electrodynamic braking is of particular importance for high‐speed transport using linear motors and developing the speed of 400–500 km/h. These traction rolling stocks will not have commonly used trucks. The tests in this area are being conducted in Japan and Germany now. The paper suggests some theoretical and practical solutions to these problems. Schematic diagrams of the locomotive braking and ways of controlling the braking force by varying electric ...

THE ASPECT OF VECTOR CONTROL USING THE ASYNCHRONOUS TRACTION MOTOR IN LOCOMOTIVES

Abstract The article examines curves controlling asynchronous traction motors increasingly used in locomotive electric drives the main task of which is to create a tractive effort‐speed curve of an ideal locomotive Fk = f(v), including a hyperbolic area the curve of which will create conditions showing that energy created by the diesel engine of diesel locomotives (electric locomotives and in case of electric trains, electricity taken from the contact network) over the entire range of locomotive speed is turned into efficient work. Mechanical power on wheel sets is constant Pk = Fkv = const, the power of the diesel engine is fully used over the entire range of locomotive speed. Tractive effort‐speed curve Fk(v) shows the dependency of locomotive traction power Fk on movement speed v. The article presents theoretical and practical aspects relevant to creating the structure of locomotive electric drive and selecting optimal control that is especially relevant to creating the structure of locomotive electric...

Theoretical and practical perspectives of diesel locomotive with DC traction motors wheel-sets’ slipping and sliding control

The causes of slipping and sliding of the locomotives driving wheel-sets are analysed from theoretical and practical perspectives. The main factors influencing wheel-sets’ slipping are described, and their correlation is determined. The specific methods of stopping the slipping of the Diesel locomotives and having a conventional electric drive system are described in the paper. The process of wheel-sets’ slipping and its control are simulated and shown graphically. Structural diagrams demonstrating the control of the dynamic locomotive wheel-sets’ slipping and sliding, based on the evaluation of the influence of the speed-torque characteristics of DC traction motors on these processes, are presented. Major parameters of the DC/DC and AC/DC systems used in the automatic control of the dynamic slipping and sliding of the locomotives wheel-sets are defined and new methods of controlling the dynamic slipping and sliding are suggested.

Management of Locomotive Tractive Energy Resources

The paper addresses some basic theoretical and engineering problems of electrodynamic braking, presenting methods of braking force regulation and using of regenerative braking returning energy (energy saving systems) and diesel engine or any form of hybrid traction vehicles systems, circuit diagrams, electrical parameters curves. Environmental awareness plus reduced operating costs are now major considerations in procuring advanced rail vehicles for considerations in procuring advanced rail vehicles. It is needed to reduce electric demand, to use new energy savings and power supply optimization, hybrid traction vehicles systems, which are using regenerative braking energy. Electric braking is effective on the all speed. Air brake cannot be used. When a vehicle brakes, energy is released to date, most of this energy is being wasted in air. The challenging alternative is to store the braking energy on the train and use it during acceleration of operation of the vehicle. Presenting energy savings power systems, which are using regenerative braking-returning energy and diesel engine or any form of hybrid traction vehicles systems, light vehicles catenary free operation, circuit diagrams, electrical parameters curves (Liudvinavicius L. New locomotive energy management systems, 2010; Sen P. C., Principles of Electric Machines, 1996).

Train Protection Systems in Different Railway Gauges

This chapter analyzes the train traffic control systems for 1435- and 1520-mm railway gauges, as well as their compatibility issues. The British Rail Traffic control system is analyzed. European train control systems (ETCS) and ETCS levels are described. Differences between European train control systems in 1435- and 1520-mm railway gauges related technical problems and proposed solutions are presented with regard to ETCS implementation in the Baltic states. The existing train control systems do not meet requirements of traffic safety in light of increased train speeds.

The Aspects of Modernization of Diesel-Electric Locomotives and Platform for Transportation of Railway Switches in Lithuanian Railways

Electrical locomotives made in Russia, Czechoslovakia and Ukraine have been used primarily in the railways of the former Soviet Union. Russian companies have manufactured the TEM1 and TEM2 diesel-electric shunting locomotives and the TEP-60 and TEP-70 passenger locomotives, while the 2M62 freight locomotives have been manufactured in Ukraine. The CME2 and CME3 shunting diesel-electric locomotives, manufactured in Czechoslovakia, were manufactured with analogous control systems of the entire powertrain and electric drive, which have many deficiencies, the most important of which is high fuel consumption. Reducing power transmission losses from the primary power source—the diesel engine—to the wheel sets is critical. JSC Lietuvos geležinkeliai, who owns a fleet of TEM2 and CME3 typical shunting locomotives, 2M62 freight locomotive and TEP-70 passenger locomotive, made the decision to modernize them. To this end, JSC Lietuvos geležinkeliai established a subsidiary company, Vilniaus lokomotyvų remonto depas UAB, where locomotives were modernized and new locomotives were manufactured for JSC Lietuvos geležinkeliai and railways abroad during the period 2005–2015. Modernization was performed together with scientists from Vilnius Gediminas Technical University (VGTU). Companies participating in the modernization effort included Vilniaus lokomotyvų remonto depas UAB, Czech company CZ Loko a.s., CJSC TMHB Transmashholding, the Briansk machine building plant (Russia), Transmashholding, Caterpillar, MTU, and the Hungarian company Woodward-Mega Kft, among others.