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Wyszukujesz frazę "Volná, J." wg kryterium: Autor


Wyświetlanie 1-6 z 6
Tytuł:
Variational equations on the Möbius strip
Variační rovnice na Möbiově pásce
Autorzy:
Urban, Z.
Volná, J.
Powiązania:
https://bibliotekanauki.pl/articles/113594.pdf
Data publikacji:
2017
Wydawca:
STE GROUP
Tematy:
Lagrangian
Euler-Lagrange equation
Helmholtz conditions
fibered manifold
Möbius strip
równanie Eulera-Lagrange'a
warunki Helmholtza
wstęga Möbiusa
Opis:
In this paper, systems of second-order ordinary differential equations (or dynamical forms in Lagrangian mechanics), induced by the canonical embedding of the two-dimensional Möbius strip into the Euclidean space, are considered in the class of variational equations. For a given non-variational system, the conditions assuring variationality (Helmholtz conditions) for the induced system on the Möbius strip are formulated. The theory contributes to variational foundations of geometric mechanics.
V tomto clánku je studována variacnost systému obycejných diferenciálních rovnic (dynamických forem v geometrické mechanice) druhého rádu, kterou indukuje kanonické vložení dvojrozmerné Möbiovy pásky do Euklidova prostoru. Pro daný nevariacní systém rovnic jsou formulovány nutné a postacující podmínky variacnosti (Helmholtzovy podmínky). Práce je príspevkem k variacním základum geometrické mechaniky na Möbiove pásce.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2017, 6, 4; 325-333
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risks and safety in the operation of railway vehicles
Autorzy:
Grenčík, J.
Volna, P.
Powiązania:
https://bibliotekanauki.pl/articles/252238.pdf
Data publikacji:
2016
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
risks
safety
railway vehicle
FMEA methodology
zagrożenie
bezpieczeństwo
pojazd szynowy
metoda FMCEA
Opis:
The need for continuous improvement of product quality, reliability and safety arises from product specifications, government regulatory requirements, agency recommendations, legal implications and above all a company’s desire to improve its market position and customer satisfaction. These issues require product manufacturers to perform risk analyses that identify and minimize part/system failures throughout the product‘s life cycle. The FMEA methodology is one of the risk analysis techniques recommended by international standards. It is a systematic process to identify potential failures to fulfil the intended function, to identify possible failure causes so the causes can be eliminated, and to locate the failure consequences so the consequences can be reduced. As an example, FMECA of railway freight tank wagon has been done on which the most critical parts and are addressed, consequently measures to reduce the risk of failure mode in operation are proposed.
Źródło:
TTS Technika Transportu Szynowego; 2016, 12; 301-305
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential of possible tilting body trains usage in Slovakia from the energy consumption and travel time point of view
Autorzy:
Grenčík, J.
Volna, P.
Mikolajčík, M.
Powiązania:
https://bibliotekanauki.pl/articles/311736.pdf
Data publikacji:
2016
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
koleje słowackie
ruch pasażerski
prędkość pociągów
Slovak railways
passenger traffic
train speed
Opis:
An important role of the railways at the moment is to increase the speed of passenger traffic. This task is because of inter-national agreements as well as the need to keep the competitiveness of railways in the transport market. The paper presents the opportunity to increase travel speed of passenger transport with using tilting body vehicles. For the selected section of the ŽSR lines travel times for vehicles with classic designs and tilting body vehicles were calculated. From their comparison a remarkable reduction of driving times showed up. Energy consumption of classical design vehicles and Pendolino type trains on the existing section of Slovak railway, considering the current speed limits and the theoretical speed limits for trains with tilting technology was assessed.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 6; 881-885
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of FMEA method in maintenance of semi-trailer combination
Autorzy:
Galliková, J.
Poprocký, R.
Volna, P.
Powiązania:
https://bibliotekanauki.pl/articles/327942.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
FMEA
failure mode and effect analysis
risk priority number
air brake system
semitrailer
liczba priorytetowa ryzyka
pneumatyczny układ hamulcowy
naczepa
Opis:
The paper deals with the proposal of new maintenance system on a semi-trailer combination. Analysis of wear and damage of air brake system components used on the semi-trailer combination based on Real experience from practice and creation of the FMEA analysis of the system using software support are presented. The need for continuous improvement of product quality, reliability and safety arises from product specifications, government regulatory requirements, agency recommendations, legal implications and above all a company’s desire to improve its market position and customer satisfaction. These issues require product manufacturers to perform risk analyses that identify and minimize part/system failures throughout the product‘s life cycle. The FMEA methodology is one of the risk analysis techniques recommended by international standards. It is a systematic process to identify potential failures to fulfil the intended function, to identify possible failure causes so the causes can be eliminated, and to locate the failure consequences so the consequences can be reduced.
Źródło:
Diagnostyka; 2016, 17, 4; 85-92
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examining the condition of the ball and the ball track on the heavy machine ZP6600
Autorzy:
Blata, J.
Šeděnka, D.
Kašiar, L.
Volna, P.
Powiązania:
https://bibliotekanauki.pl/articles/327332.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
ball track
material exam
state of tenseness
contact tension
maszyna górnicza
tor kulki
materiał
stan naprężenia
naprężenie kontaktowe
Opis:
The article deals with the examination of the state of the ball track at the heavy machine ZP 6600/Z79. This kind of machines are located in Doly Bílina. Article presents results of material exams which were taken on given samples and it describes the progress and results of the numeric calculations for the state of tenseness. The material tests were realized in an external cooperation. The numeric simulation of the tenseness was made in the VÚHU a. s. on the 3D model of the contact by a method of the ultimate elements. The used method works with the ending parts at the bottom of part of the ball track when it touches the ball. To determine the internal and contact forces in the ball and the bottom part of the ball track we used the software called COSMOS/DesignStar ver. 6.0. The result was an evidence for the decision about the depth of the turned layer of the material in order to create a new groove of the bottom part of the ball track.
Źródło:
Diagnostyka; 2017, 18, 3; 85-91
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FMEA analysis of combustion engine and assignment occurrence index for risk valuation
Autorzy:
Poprocký, R.
Galliková, J.
Stuchlý, V.
Volna, P.
Powiązania:
https://bibliotekanauki.pl/articles/328215.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
FMEA
combustion engine
occurrence
risk
silnik spalinowy
ryzyko
Opis:
The need for continuous improvement of product quality, reliability and safety arises and above all a company’s desire to improve its market position and customer satisfaction. These issues require product manufacturers to perform risk analyses that identify and minimize part/system failures throughout the product‘s life cycle. In the paper we will apply the Failure Modes and Effects Analysis (FMEA) for analysis of combustion engine failures. We analyzed 15 different types of cars in which the 2.0 TDI was equipped. On the basis of the obtained data, we evaluated the most disturbing parts of the combustion engine and on these elements we determined the probability of occurrence of a fault which is one of the factors determining the Risk Priority Number (RPN).
Źródło:
Diagnostyka; 2017, 18, 3; 99-105
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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