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RISS 인기검색어
- 검색키워드
- 저자 : T. Real (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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Static and Dynamic Behavior of Transitions between Different Railway Track Typologies
T. Real,C. Zamorano,C. Hernández,J. A. García,J. I. Real 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.4
A railway track stretch comprising three different track typologies (i.e., ballasted track, asphalt slab track and concrete slab track) has been modeled using a three-dimensional Finite Elements model, which has been calibrated and validated using real acceleration records. In this model, two different analyses have been run: a static analysis to assess the stiffness evolution and a dynamic analysis to calculate the accelerations induced by the train loads along the transition zones. These analyses have been used to assess the performance of three different techniques existing in the literature to improve the structural behavior of the track in the transition areas: the variation of the stiffness of the elastomers, the implementation of additional rails and the use of resilient mats. Results have demonstrated that these techniques perform generally better in the track vertical stiffness transition between the concrete and asphalt slab tracks while the dynamic response is not significantly altered in any scenario.
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Structural and Dynamic Performance of an Asphalt Slab Track in a Sharp Curve
T. Real,C. Hernández,F. Ribes,J. I. Real 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.1
The increasing preoccupation about railway externalities, such as train-induced vibrations, has prompted the incorporation of bituminous materials as a part of the railway infrastructure. In this paper, the structural and dynamic behavior of a real asphalt slab track, made of a mixture SMA-16 with a 0.5% of recycled plastomers is studied with a FEM model of the vehicle and the track considering both vertical and lateral dynamics. The FEM model is used to study the different dynamic behavior on the track surroundings due to the effect of the trains passing at different speeds. The paper has two main purposes. One is to provide the differences in dynamic response for straight and curved sections at three different speeds. The other aim of the paper is to obtain high tangential stresses in the interfaces between the different layers of the infrastructure. The results reveal how the structural behavior of the track is checked and demonstrate the important role of horizontal accelerations induced in the infrastructure.
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Experimental modal analysis of railway concrete sleepers with cracks
Real, J.I.,Sanchez, M.E.,Real, T.,Sanchez, F.J.,Zamorano, C. Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.1
Concrete sleepers are essential components of the conventional railway. As support elements, sleepers are always subjective to a variety of time-dependent loads attributable to the train operations, either wheel or rail abnormalities. It has been observed that the sleepers may deteriorate due to these loads, inducing the formation of hairline cracks. There are two areas along the sleepers that are more prone to crack: the central and the rail seat sections. Several non-destructive methods have been developed to identify failures in structures. Health monitoring techniques are based on vibration responses measurements, which help engineers to identify the vibration-based damage or remotely monitor the sleeper health. In the present paper, the dynamic effects of the cracks in the vibration signatures of the railway pre-stressed concrete sleepers are investigated. The experimental modal analysis has been used to evaluate the modal bending changes in the vibration characteristics of the sleepers, differentiating between the central and the rail seat locations of the cracks. Modal parameters changes of the 'healthy' and cracked sleepers have been highlighted in terms of natural frequencies and modal damping. The paper concludes with a discussion of the most suitable failure indicator and it defines the vibration signatures of intact, central cracked and rail seat cracked sleepers.
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Experimental modal analysis of railway concrete sleepers with cracks
J.I. Real,M.E. Sánchez,T. Real,F.J. Sánchez,C. Zamorano 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.1
Concrete sleepers are essential components of the conventional railway. As support elements, sleepers are always subjective to a variety of time-dependent loads attributable to the train operations, either wheel or rail abnormalities. It has been observed that the sleepers may deteriorate due to these loads, inducing the formation of hairline cracks. There are two areas along the sleepers that are more prone to crack: the central and the rail seat sections. Several non-destructive methods have been developed to identify failures in structures. Health monitoring techniques are based on vibration responses measurements, which help engineers to identify the vibration-based damage or remotely monitor the sleeper health. In the present paper, the dynamic effects of the cracks in the vibration signatures of the railway pre-stressed concrete sleepers are investigated. The experimental modal analysis has been used to evaluate the modal bending changes in the vibration characteristics of the sleepers, differentiating between the central and the rail seat locations of the cracks. Modal parameters changes of the ‘healthy’ and cracked sleepers have been highlighted in terms of natural frequencies and modal damping. The paper concludes with a discussion of the most suitable failure indicator and it defines the vibration signatures of intact, central cracked and rail seat cracked sleepers.
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VO2 thin films based active and passive thermochromic devices for energy management applications
Cheikhou O.F. Ba,Souleymane T. Bah,Marc D,Vincent Fortin,P.V. Ashrit,Real Vallee 한국물리학회 2014 Current Applied Physics Vol.14 No.11
VO2 thin films were fabricated by argon ion beam assisted non-reactive ac dual magnetron sputtering followed by carefully controlled thermal oxidation. This method is known to give high quality compact thin films with uniform high deposition rates. Thin films deposited on both bare glass and indium tinoxide (ITO) coated glass substrates were studied, respectively, as passive and active thermochromic devices for their electrical and optical switching behaviors. Thin films varying in thicknesses from 65 to 250 nm were investigated. ITO film was used as an integrated heating device to activate the phase transition via an applied bias voltage. Such structures were found to bear several advantages from an application point of view.
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Cabrera, S.,Ji, A.R.,Frejo, L.,Ramos-Mejia, V.,Romero, T.,Real, P.,Lopez-Escamez, J.A. Elsevier 2015 Stem cell research Vol.15 No.2
We have generated iPSCs from peripheral blood mononuclear cells (PBMCs) of a healthy man using heat sensitive and non-integrative Sendai virus containing Sox2, Oct¾, c-Myc and Klf4. Human GRX-MCiPS4F-A2 cell line was established and characterized through this study.
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