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Wyszukujesz frazę "high-speed train" wg kryterium: Temat


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Tytuł:
A framework for categorizing risks in High Speed Train (HST) projects: the example of the first HST in Brazil
Uma estrutura para categorização de riscos em projetos de trens de alta velocidade (TAV): o exemplo do primeiro TAV do Brasil
Autorzy:
Grubisic, V.
Zagheni, E.
Asaff, Y.
Dias, A.
Powiązania:
https://bibliotekanauki.pl/articles/374715.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
framework
risk
high speed train
Brazil
struktura
ryzyko
pociąg ekspresowy
Brazylia
Opis:
High Speed Train projects are exposed to risks of different natures, such as: low participation of private companies in the new railways construction, lack of skilled labor, high technology not available in the internal market, high costs with land acquisition, among others. Such risks if not managed properly can become real problems and compromise the achievement of the project objectives. The risk identification is the process of collection and description of events that can have negative effects on the project. This process should consider the project uncertainty elements in order to generate specific results. In the case of HST projects, examples of uncertainty elements are: politics, economy, environment, human resources and technology. Therefore, this study aims to present a framework for categorizing risks to be used in HST projects. Also, for each category proposed some risk examples are suggested. An overview of the first Brazil HST project is showed and the risk framework is proposed. A discussion on the risks in the first Brazil HST project are presented followed by final conclusions.
Projetos de trens de Alta Velocidade estão expostos a riscos de diversas naturezas como: baixa participação de empresas privadas na construção de novas ferrovias, falta de mão de obra especializada, tecnologia de ponta não disponível no mercado interno, altos custos com aquisição de terrenos, alto impacto ambiental, entre outros. Tais riscos senão forem gerenciados corretamente podem se tornar problemas e comprometer os objetivos do projeto. A identificação de riscos é o processo de coleta e descrição de eventos que podem ter efeitos negativos sobre o projeto. Este processo deve considerar os elementos de incerteza do projeto, a fim de gerar resultados específicos. No caso de projetos de TAV, são exemplos de elementos de incerteza: política, economia, meio ambiente, recursos humanos e tecnologia. Portanto, este estudo tem como objetivo apresentar uma estrutura para classificar os riscos a ser usada em projetos de TAV. Para cada categoria de risco, exemplos de riscos são apresentados. Uma visão geral do primeiro projeto de TAV do Brasil e seus principais riscos são mostrados. Finalmente, tem-se uma discussão sobre os principais resultados do artigo e as conclusões finais.
Źródło:
Transport Problems; 2015, T. 10, z. spec.; 37-46
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction and validation for the aerodynamic noise of high-speed train power car
Autorzy:
Jiang, S.
Yang, S.
Wu, D.
Wen, B-Ch.
Powiązania:
https://bibliotekanauki.pl/articles/375504.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
aerodynamic noise
high-speed train
Lighthill-Curle theory
simulation model
online test
hałas aerodynamiczny
pociąg ekspresowy
teoria Lighthilla-Curle
model symulacyjny
test online
Opis:
The aerodynamic noise of high-speed train power car was investigated in this article. The full-scale power car was first modeled, and the external steady flow field was computed by a realizable k-ε turbulence model. The aerodynamic noise sources of the power car surface and the external transient flow field were then calculated by broadband noise source model and large eddy simulation (LES) model, respectively. The static pressures on the train surface were obtained from the results of the transient model. Considering the transient flow field, the far-field aerodynamic noise generated by the power car was finally derived from Lighthill-Curle theory. It was validated by means of on-line tests that have been performed along a real high-speed railway line. Through comparisons between simulations and measurements, it is shown that the simulation model gives reliable aerodynamic noise predictions. We foresee numerous applications for modeling and control of the aerodynamic noise in high-speed train.
Źródło:
Transport Problems; 2018, 13, 2; 91-102
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
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