New doctoral dissertation

April 11, 2022

VILNIUS TECH Library invites you to follow the published new dissertations. The dissertation „Research on a bus frame with fiberglass elements“ prepared by VILNIUS TECH, Tautvydas Pravilonis, is presented in Lithuanian. The dissertation was prepared in 2017–2022, supervisors  – Assoc. Prof. Dr. Edgar Sokolovskij.

The dissertation will be defended at the public meeting of the Dissertation Defence Council of Transport Engineering in the Senate Hall of Vilnius Gediminas Technical University at 10 a. m. on 11 April 2022.

„The dissertation investigates the frame structure of a bus, which is made using innovative materials that reduce the vehicle’s overall weight. One of the main problems solved in the dissertation is assessing structural safety by performing computer simulations of rollover and side impact based on the finite element method and natural experiments. The dissertation also evaluated the change of dynamic parameters and passenger comfort. The thesis includes an introduction, four chapters, general conclusions, the list of references, the list of the author’s publications on the thesis subject and seven annexes. The introductory chapter reviews the research problem and the relevance of the thesis. It presents the formulated research object, aim and tasks of the thesis, the research methodology, the scientific novelty, the practical significance, and the defended thesis statements. The end of the introduction provides the author’s publications and conference papers on the topic of the dissertation and the structure of the dissertation. The first chapter reviews research papers on the topic of the thesis. It presents an analysis of the requirements ensuring the safety of the bus frame structure and an overview of measures applied to minimise the vehicle mass and ensure safety. The second chapter describes tests performed to determine the mechanical properties of an innovative fibreglass composite material made by pultrusion. It compares different materials and presents the created material model. The third chapter presents numerical models used in the calculations of the bus frame structure in dynamics. Computer simulations evaluate and compare the parameters of different structures. The fourth section presents the equipment used to evaluate the strength and dynamic characteristics of the bus frame structure. It presents the experimental research methodology, the results of experimental field tests and compares the results. Nine scientific articles on the thesis subject have been published: four publications have in scientific journals included in the Clarivate Analytics Web of Science database, two in other international publications database, one in peer-reviewed periodical and disposable publications and two in the peer-reviewed conference proceedings“.

Doctoral dissertation readers can search via VILNIUS TECH Virtual Library
 

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New doctoral dissertation
New doctoral dissertation
VILNIUS TECH Library invites you to follow the published new dissertations. The dissertation „Performance investigation of a hybrid car engine fuelled with gasoline and gaseous mixtures“ („Benziną ir dujų mišinius naudojančio hibridinio automobilio variklio efektyvumo tyrimas“) prepared at VILNIUS TECH by Tadas Vipartas. The dissertation was prepared in 2021–2026. Scientific consultant – Prof. Dr Alfredas Rimkus. The dissertation was defended at the public meeting of the Dissertation Defence Council of the Scientific Field of Transport Engineering in the Aula Doctoralis Meeting Hall of Vilnius Gediminas Technical University at 9 a.m. on 12 June 2026. This dissertation investigates the use of alternative fuels (natural gas and hydrogen) to increase the efficiency of a spark-ignition engine. The impact of different fuels and engine control algorithms on the combustion process and on energy and ecological indicators was determined and evaluated by analysing the emerging technological constraints within the context of a power-split (series-parallel) hybrid powertrain. The dissertation presents a review of scientific literature, analysing the directions for internal combustion engine improvement, the properties of gaseous fuels and the challenges of their application, along with the operating principles of automotive hybrid powertrains. Bench tests were conducted to investigate the effect of late intake valve closing timing on an engine operating on natural gas, and the influence of hydrogen additives on the combustion process and knock control. The numerical analysis of the engine’s combustion process was performed using AVL BOOST™ software, while the energy and ecological indicators of the hybrid vehicle were evaluated through experimental research and numerical simulation in the AVL CRUISE™ software. The following main results were obtained in the dissertation: retarding the intake valve closing timing increased the brake thermal efficiency and NOx emissions while reducing carbon dioxide emissions when the engine operates on natural gas. It was determined that a hydrogen additive in the fuel improves the engine’s energy indicators, but increases nitrogen oxides emissions and the risk of engine knock. Engine knock is effectively managed by retarding the ignition advance angle. Numerical simulation results confirmed that these trends persist during the Worldwide Harmonized Light-duty Vehicles Test Cycle: the use of hydrogen reduces fuel consumption and carbon dioxide emissions, but increases nitrogen oxides emissions. The dissertation results revealed the potential of these technologies and strategies for their application. The obtained data can be applied in the development and selection of advanced engine control algorithms and in the formulation of technologically sound environmental standards. Nine scientific articles have been published on the topic of the dissertation: six in scientific journals indexed in the Clarivate Analytics Web of Science database with an impact factor, one in a scientific journal indexed in the Clarivate Analytics Web of Science database without an impact factor, one in conference proceedings indexed in the Clarivate Analytics Web of Science Conference Proceedings Citation Index, and one in peer-reviewed conference proceedings not indexed in international databases. The research results were presented at three scientific conferences in Lithuania and Poland. Doctoral dissertation readers can search via VILNIUS TECH Virtual Library.
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