Leszek Jarzębowicz - Publications - Bridge of Knowledge

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Year 2013
Year 2023
Year 2008
  • Nowe metody diagnostyki technicznej taboru kolejowego
    Publication

    Systemy sterowania pojazdów trakcyjnych można podzielić na następujące dwie główne generacje:- systemy stykowo-przekaźnikowe, w których realizacja programu sterowania wynika z uzależnień elektromechanicznych i sposobu połączenia elementów między sobą,- systemy mikrokomputerowe, w których wzajemne uzależnienia urządzeń wykonawczych i realizacja funkcji sterujących są przejmowane przez program mikrokomputera.Pojazdy obu generacji...

Year 2011
Year 2015
Year 2014
Year 2016
Year 2021
  • Practical Eco-Driving Strategy for Suburban Electric Multiple Unit
    Publication

    In this paper, a practical approach to velocity profile optimization for electric multiple unit was presented. The study focuses on a case of fast urban railway, which is a popular mean of transport across Tricity, Poland. Based on observations and measurements, a potential for improvement of energy efficiency by modifying the speed profile was recognized. In order to conduct necessary calculations, simulation model of railway...

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Year 2019
  • Quasi-discrete modelling of PMSM phase currents in drives with low switching-to-fundamental frequency ratio
    Publication

    This study proposes a new quasi-discrete approach to modelling the permanent magnet synchronous motor (PMSM). The quasi-discrete modelling reflects the impact of continuous rotor movement, which takes place during a control cycle, on the shape of motor current waveforms. This provides much improvement in current modelling accuracy under inverter low switching-to-fundamental frequency operation. The proposed approach may be used...

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  • Synchronized six-step voltage generation in high-speed PMSM drive
    Publication

    Synchronized voltage generation has already been considered in the context of pulse width modulation (PWM). References prove that synchronized PWM substantially decreases subharmonics in inverter output voltage when operating with low switching-to-fundamental frequency ratio. This paper identifies problems of unsynchronized voltage generation in electric drives under six-step inverter operation. Guidelines for the synchronization...

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Year 2017
Year 2009
Year 2012
Year 2010
Year 2006
Year 2020
  • Utility analysis and rating of energy storages in trolleybus power supply system
    Publication

    The article discusses two energy storage applications in power supply system of public electrified transport. The first application aims at reducing the peak power of the traction substation. The second application increases effectiveness of using solar power plant to cover partial power demand of traction supply system. These two applications were discussed and analyzed based on trolleybus supply system in Gdynia, where most measurements...

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