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1
Content available Vehicle coast-down method as a tool for calculating total resistance for the purposes of type-approval fuel consumption
Šarkan B., Skrúcaný T., Semanová Š., Madleňák R., Kuranc A., Sejkorová M., Caban J.
Zeszyty Naukowe. Transport / Politechnika Śląska
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2018
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z. 98
161--172
EN
A coast-down test is carried out in cases when there is a need for the exact expression of the forces acting on a road vehicle during its coast-down. These forces act mainly against the vehicle’s movement due to air and tyre rolling resistance. Knowledge of the course of these forces throughout the vehicle’s movement range is also a requirement when measuring fuel consumption with a roller performance dynamometer. The reason is that this device has to load the rollers by force or performance corresponding to the given vehicle, while testing it during various driving cycles. For approval purposes, the requirements for this type of test are described in the applicable regulations, i.e., UNECE Regulations No. 83 and No. 101, or the newly developed Worldwide Harmonized Light Vehicles Test Procedure (WLTP). Slovak Technical Standard STN 30 0556 also contains detailed procedures for carrying out the test. The authors of this paper have taken into account both types of technical regulations in order to conduct coast-down tests on chosen vehicles. The results are usable in terms of measuring fuel consumption on a roller dynamometer. Furthermore, the vehicle’s economic performance in normal operation mode can be also assumed with these results.
2
Content available Grid type impact on the results of the volume of fluid method in the free surface flow calculations around ship hull
Sugalski K., Skrúcaný T.
New Trends in Production Engineering
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2018
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Vol. 1, Iss. 1
151--157
EN
This article presents results of the free surface flow around ship hull on two different types of computational grid. Each type of mentioned grid has its own advantages and disadvantages in particular cases, mostly in one phase simulation. Omitting cases with capitation, there is no free surface involved in one phase simulation. Multiphase simulations are crucial in the ship design process and optimization. Recreating free surface on the triangular mesh causes difficulties, in contrast to the hexahedral meshes, where calculated surface is more aligned to the physical border of the fluids. In this paper, results from the triangular mesh were compared to results from hexahedral mesh. Conclusions about triangular meshes in two phase simulation are presented. The computational fluid dynamic toolbox OpenFOAM is used to perform calculations of the total resistance of work boat in calm water.
3
Content available The effect of fuel on the energy consumption and production of greenhouse gases in transport
Conradie P. D. F., Asekun O. O., Skrúcaný T., Kendra M., Stopka O.
Archiwum Motoryzacji
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2018
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Vol. 82, nr 4
5--14
EN
Nowadays, the environmental aspects of transport are very actual issues, mainly the energy consumption and GHG production. The priority of EU transport strategy is to decrease the negative environmental impacts of all transport modes. The article discusses the calculation of the energy consumption and production of greenhouse gases in transport from both the primary and secondary points of view. This means, that it reflects the implications on the environment not only while operating the vehicle, but also during production, refining, distribution and storage of the fuel used in transport. The calculation is done by using the methodology of the standard EN 16 258:2012. This standard is used on all cars using various types of propellants. The results of the calculation show in a non-discriminatory manner the energy effectiveness of the individual types of fuel, as well as the rate of their production of greenhouse gases expressed in a comparison unit of equivalent CO2e.
4
Content available Analysis of the influence of different means of transport on the level of traffic noise
Figlus T., Gnap J., Skrúcaný T., Szafraniec P.
Zeszyty Naukowe. Transport / Politechnika Śląska
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2017
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z. 97
27--38
EN
One of the factors influencing the level of traffic noise is the type of vehicles moving on the roads. The paper presents comprehensive research, as conducted by the authors, which sought to assess the traffic noise level generated by different means of transport. A comparison is made between the noise generated by personal cars, a truck and different types of motorcycle. The maximum sound level and the equivalent sound level emitted by the investigated means of transport were analysed in the entire frequency band and in the individual 1/3 octave bands. Based on the research, conclusions have been formulated regarding the influence of the different types of means of transport and their speeds on traffic noise near a road, along with possible ways to reduce its level.
5
Content available Badania stanowiskowe wpływu rodzaju kasku na poziom dźwięku docierający do motocyklisty
Figlus T., Szafraniec P., Skrúcaný T.
Autobusy : technika, eksploatacja, systemy transportowe
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2017
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R. 18, nr 6
159--162, CD
PL
Użytkowanie motocykli powoduje bezpośrednie oddziaływanie drgań i hałasu na ich użytkowników. Jednym z istotnych zagrożeń jest wysoki poziom dźwięku docierający do narządu słuchu motocyklisty i pasażera. Kaski motocyklowe oprócz zapewnienia ochrony głowy, powodują również ograniczenie poziomu dźwięku na który narażeni są użytkownicy motocykli. Jak wynika z badań autorów wybór rodzaj kasku ma istotny wpływ na poziom zagrożenia hałasem. W pracy przedstawiono wyniki badań stanowiskowych, których celem była ocena jak zmienia się poziom i charakterystyka częstotliwościowa dźwięku docierającego do przewodu słuchowego motocyklisty w zależności od rodzaju kasku który wykorzystuje.
EN
The use of motorcycles directly affects their users through vibration and noise. One of the major threats is the high level of sound that reaches the hearing organ of the motorcyclist and the passenger. Motorcycle helmets, in addition to protecting the head, also reduce the level of noise that motorcyclists are exposed to. As results from the authors' research, the choice of the type of helmet has a significant impact on noise exposure levels. The paper presents the results of stand tests which aimed at assessing how the level and frequency characteristics of the sound reaching the motorcyclist's ear canal change depending on the type of helmet they are using.
6
Content available Efficiency of anti-noise barriers in railway transport
Hranický M. P., Kendra M., Skrúcaný T.
Technical Issues
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2016
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nr 3
43--52
EN
This paper is focused on the comprehensive analysis of the railway noise issues. It deals with the influence of noise on the environment and presents the options how the noise from the railway transport might be reduced by noise barriers. In conclusion, the theoretical part is complemented by a practical one in the form of measuring and subsequent analysis.
7
Content available Noise measurement in the interior of passenger road vehicles
Skrúcaný T., Kendra M.
Technical Issues
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2015
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nr 2
40--46
EN
The noise is the one of negative elements influencing human health. This article aims at the measurement of noise emitted by road vehicle and its parts during the operation. The measurement was done with a digital sound meter in the interior of common passenger cars. The results compare the noise value in different cars with different body shape, which influences the drivers health.
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