Piotr Gołębiowski

Models of traffic flow distribution for various scenarios of the development of proecological transport system

The paper is a result of a research work concerning the development of an environmentally friendly transport system Project EMITRANSYS. The publication contains the issues of shaping the transport system, where important factor due to the aspect of sustainable development is including the external costs in transport activity. This paper presents a mathematical model of the distribution of the traffic flow in the transport network. The paper presents selected aspects of the problem of multi-variant distribution of the traffic stream on the network transport for defined scenarios for the transport system development. Traffic distribution on the network has been made due to the criterion function – external cost connected with air pollution. The paper presents modal split of traffic ecological flow for chosen scenarios of the development domestic transport system.

Identification and analysis of parameters for the areas of the highest harmful exhaust emissions in the model emitransys

The development of human civilisation has always been related to an increase in energy demand. The growth of transportation and an increase in the number of automobile vehicles in service produce a rising demand for fuel. Before piston IC engine is replaced with a different effective power source, it is necessary to use gaseous fuels on a larger scale than ever before. The natural resources of gaseous fuels are estimated to be much higher than crude oil reserves. Additionally, engines can run on biogas, i.e. gaseous renewable fuel. The use of gaseous fuels means lowering the harmful effect engines produce on the natural environment. Multi-fuelling, i.e. switching from one fuel to another, could be an advantageous feature of automobile combustion engine, both from the user’s standpoint and with respect to environmental concerns. Gaseous fuels have desirable properties that are especially suitable for fuel of spark ignition engines. The paper presents the engine test bench constructed at the Laboratory of Heat Engines of the Kielce University of Technology. The test stand comprises modern spark ignition engine Fiat 0.9 MultiAir and the eddy-current brake. At the test stand, the engine was converted to fuelling with three fuels, namely petrol, LPG gas blends and compressed natural gas (CNG). The engine could run alternatively on the three fuels mentioned above. The stand is equipped with an external unit to control the engine work, which makes it possible to extend the range of the engine investigations.

Traffic organization on the railway network and problem of construction of graphic train timetable

The organization of railway traffic is a complex decision-making problem. Its complexity results from the multiplicity of problems and from the number of factors, which should be considered. Amongst the research areas, concerning the organization of railway traffic construction of rational train timetable is taking the essential place. In the article was described technical-organizational conditioning of the construction of graphic train timetable. We presented mathematical models of the construction of train timetable, in which we took into account-selected boundary conditions. A way of solving a problem was presented also. Issues of the construction of the graphic train timetable, technical-organizational conditioning of the construction of the graphic train timetable, the organization of the rail traffic and the formalization of the record of the construction of the graphic, boundary conditions and indicators of the quality assessment of the solution, the areas of research concerning the problem of the organization of railway traffic, correct preparing of the graphic timetable, mathematical model are presented in the paper. Introduced in outline mathematical model allows for pathing of trains on the graphic timetable in compliance with priorities of pathing.

Multi-option Model of Railway Traffic Organization Including the Energy Recuperation

The article presents the issue of organization of railway traffic within the station, taking into account energy recuperation. We identified a number of factors which affect the energy efficiency of recuperation, including the issue of transfer of energy technology between a few vehicles. We presented some aspects of the decision problem of graphic train timetable construction with regard to recuperation. As an indicator of quality solution assessment we proposed vector objective function consists of three sub-objective function.

The Influence Of The External Costs Of Modal Split In The Transport Network, With Particular Reference To Rail Transport

Vehicles have an impact on environmental pollution through emissions. Thus, they generate different carbon footprints, or emit different amounts of carbon dioxide into the atmosphere. This article attempts to determine the effects of carbon dioxide on the distribution of the traffic stream in the selected part of the transport network. For the analysis the Warsaw–Krakow route was chosen. The movement between these two cities can be performed with different modes of transport. The distribution of the passenger streams was conducted for three variants of the three sub-criteria: minimum average costs, minimum marginal costs and the costs of environmental pollution. The unitary cost of carbon dioxide emission was determined using a CO₂ Calculator. The selection of the variant of the passenger stream distribution was carried out using a multi-criteria evaluation method called MAJA.

Technical and environmental limitations of pro-ecological transport system designing

Transport is one of the most environmentally destructive branches of economy. It contributes to environmental degradation and influences negatively on human live. It should therefore seek to reduce the negative impact on the environment. The paper presents many aspects of development of the national transport system. In article characterized technical constraints and environmental issues, which are applicable to the designing of pro-ecological transport system. Presented in it also indicators of the proposed design solution quality. In shaping the pro-ecological system the special role plays environmental restrictions, because they mainly determine the quality of solutions in terms of minimizing the negative impact of transport on the environment. Technical factors are equally important, because they allow, among others, reducing the external costs of congestions and allow on the creation of transport tasks on the appropriate level. In particularly, EU requirements for sustainable development of the transport system, the components of the external costs arising from the sphere of transport, indicators and ecological limitations in designing of pro-ecological transport system, ecological limitations, technical limitations, indicators for assessing pro-ecological transport system are presented in the paper.