Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Razvan Andrei Oprea"'
Autor:
Razvan Andrei Oprea
Publikováno v:
Australian Journal of Mechanical Engineering. 16:139-146
Start-up dynamics plays an essential role in ensuring the comfort and running safety and structural integrity of trains. Based on the discontinuous dynamics framework, in the present work, an efficient innovative model is proposed. The model is deriv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::598ddd69a44332b602439d1d9a911bc7
https://doi.org/10.1080/14484846.2018.1485297
https://doi.org/10.1080/14484846.2018.1485297
Publikováno v:
Applied Mechanics and Materials. :1103-1108
The study refers to optimizing energy consumption from electric trains, underground trains and electric locomotives. The actual requirements of the dynamic market economy are forcing the railway system to transform into a reliable alternative to the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a5d53a596015ffc2dd3cbb09e371427a
https://doi.org/10.4028/www.scientific.net/amm.809-810.1103
https://doi.org/10.4028/www.scientific.net/amm.809-810.1103
Publikováno v:
Applied Mechanics and Materials. :610-615
The use of high power railway vehicles requires enhanced control of wheel-rail adherence. When setting the train in motion, driving axles can exhibit torsional vibrations resulting in poor adherence and even axle damage. A significant number of railw
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d24b7811f29e6913f74bb7eb15b935b8
https://doi.org/10.4028/www.scientific.net/amm.809-810.610
https://doi.org/10.4028/www.scientific.net/amm.809-810.610
Publikováno v:
Applied Mechanics and Materials. :1079-1084
A modal analysis of truck system was performed. Eigen frequencies and eigenmodes are described. In order to validate the model, the engine was tested with various excitations. Acceleration responses were measured and frequency spectral analyses were
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9a566bad7a63687fa19761a6a551fc8f
https://doi.org/10.4028/www.scientific.net/amm.809-810.1079
https://doi.org/10.4028/www.scientific.net/amm.809-810.1079
Publikováno v:
IOP Conference Series: Materials Science and Engineering. 682:012003
The wheel-rail contact patch analysis methods are related to the evolution of modern computers. Contemporary computation systems allow the approach of tri-dimensional methods which take into account various contact parameters. With this background in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5ab4d8584ebdf13a3ec12baca90090bb
https://doi.org/10.1088/1757-899x/682/1/012003
https://doi.org/10.1088/1757-899x/682/1/012003
Publikováno v:
MATEC Web of Conferences, Vol 178, p 05004 (2018)
It is a well-known fact that the raising of the pantograph is followed by an electric arch. The reasons for this phenomenon are the oscillations of the pantograph and the oscillations of the contact line. Initially, these oscillations are not coupled
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b30dec642faec6d72f248eed6c7c1cbc
https://doaj.org/article/822e93d1576440d98d3ff7ecb0582209
https://doaj.org/article/822e93d1576440d98d3ff7ecb0582209
Autor:
Razvan Andrei Oprea
Publikováno v:
Multibody System Dynamics. 30:101-116
Impacts, friction, and normal contact forces occur in the railway vehicles couplers. This paper presents a novel nonsmooth model of the train collision; until now, only penalized models have been approached. The train dynamics is described by an equa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fa91b5e37e280f4d53868ca2edf88fb0
https://doi.org/10.1007/s11044-013-9368-5
https://doi.org/10.1007/s11044-013-9368-5
Publikováno v:
Vehicle System Dynamics. 51:460-480
Braking dynamics plays an essential role in ensuring the comfort and running safety of trains. Due to the complexity of the phenomena involved and the presence of dry friction, studies have been carried out by numerical methods using smoothening. Bas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d3831f4b62eb3ad7671a6de6cff8da7e
https://doi.org/10.1080/00423114.2012.744459
https://doi.org/10.1080/00423114.2012.744459
Autor:
Razvan Andrei Oprea
Publikováno v:
Nonlinear Dynamics. 70:1095-1106
An efficient and straightforward algorithm for the integration of the constrained systems is developed in the present work. Some of the fundamental issues of contact dynamics are briefly reviewed. Considering Gauss’ least constraint principle, an i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::15ecc649b0351e23f1c988e57970dd1d
https://doi.org/10.1007/s11071-012-0515-y
https://doi.org/10.1007/s11071-012-0515-y
Publikováno v:
IOP Conference Series: Materials Science and Engineering. 400:022057
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ddf4fea8ba48b70436478fcbc78932cd
https://doi.org/10.1088/1757-899x/400/2/022057
https://doi.org/10.1088/1757-899x/400/2/022057