Dimenzování pevných trakčních zařízení - energetické výpočty

Abstract

Demandingness of the energy calculation by means of the rail vehicle momentary output time integration method lies in a need for detailed input data as a tachogram - a time-speed relation and a corresponding passed distance which can be obtained by a calculation or from a train entrepreneur. A locomotive load value, comprising wagons and resistance components of a track, determines a required tractive power value on a wheel circumference. Each traction power value is assigned to a traction motor current value in traction characteristics, which can be further used for a locomotive output calculation. To make the calculation more accurate a model has been created in the Matlab – Simulink software, its advantage is to simulate a dynamic behavior of a model which is affected by more influences at the same time. The simulation time can be shortened in an exact ratio to the real time and thus an evaluation and implementation of changes of the model parameters can be performed more quickly. The track and rail vehicle input data are demanded also for specific energy consumption calculation by means of a method of loss components and traction work performed during a run. Within the dissertation work a program has been developed to speed up the calculation procedure after entering input data and to show the total energy consumption result and its influence on thermal effects on the traction mains. A measurement on a unilaterally supplied tramway track in the Vřesinská – Zátiší segment with a length of 9 km was performed in order to compare the calculated values of the electrical energy consumption during the tramway run using programme applications. A GPS receiver integrated to a mobile phone and a GPSLogger application for Android were used for recording speed and position values. A tramway track model used in subsequent energy calculations was built in the Matlab - Simulink mathematical environment using GPS coordinates and corresponding data from geological web sites.