scholarly journals The role of surrogate models in combined aeroelastic and structural optimization of cable-stayed bridges with single box deck

2016 ◽  
Author(s):  
M. Cid Montoya ◽  
S. Hernández ◽  
I. Kusano ◽  
F. Nieto ◽  
J. Á. Jurado
Keyword(s):  
Structural Optimization ◽  
Surrogate Models ◽  
Cable Stayed Bridges

scholarly journals Role of nonspherical double counting in DFT+DMFT: Total energy and structural optimization of pnictide superconductors

2018 ◽  
Vol 97 (20) ◽  
Author(s):  
Oleg Kristanovski ◽  
Alexander B. Shick ◽  
Frank Lechermann ◽  
Alexander I. Lichtenstein
Keyword(s):  
Structural Optimization ◽  
Total Energy ◽  
Double Counting ◽  
Pnictide Superconductors

Role of dynamic water rivulets in the excitation of rain–wind-induced cable vibration: A critical review

2021 ◽  
pp. 136943322110401
Author(s):  
Donglai Gao ◽  
Wenjie Li ◽  
Haiquan Jing ◽  
Jian Wang ◽  
Jintuan Wu ◽  
...  
Keyword(s):  
Wind Engineering ◽  
Excitation Mechanism ◽  
Structure Interaction ◽  
Wall Boundary Layer ◽  
Stay Cables ◽  
Considerable Research ◽  
Complex Fluid ◽  
Wind Induced Vibration ◽  
Cable Stayed Bridges

It has been more than 30 years since Hikami Y and Shiraishi N (1988) Rain–wind-induced vibrations of cable-stayed bridges. Journal of Wind Engineering and Industrial Aerodynamics 29: 409–418 first reported the rain–wind-induced vibration (RWIV) of stay cables in the construction stage of Meikonishi Bridge, Japan. After that, considerable research efforts have been devoted to understanding the RWIV of stay cables, and the role of the upper rivulet has been gradually realized and studied. This study presents a selective review on recent progress of RWIV and its controversial excitation mechanism. The available knowledge and up-to-date understanding of this complex fluid-structure interaction are presented in some detail. The formation, dynamics of water rivulet, and its role in affecting the near-wall boundary layer properties and in the excitation scenario of RWIV are of particular interest in this study. Finally, some limitations of previous studies are concluded, with some perspective suggestions for further study of excitation mechanism of RWIV.

scholarly journals Modelling for Digital Twins—Potential Role of Surrogate Models

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 476
Author(s):  
Ágnes Bárkányi ◽  
Tibor Chován ◽  
Sándor Németh ◽  
János Abonyi
Keyword(s):  
Model Building ◽  
Surrogate Models ◽  
Uncertain Information ◽  
Industrial Case Study ◽  
Continuous Processes ◽  
Digital Twin ◽  
Box Models ◽  
Digital Twins

The application of white box models in digital twins is often hindered by missing knowledge, uncertain information and computational difficulties. Our aim was to overview the difficulties and challenges regarding the modelling aspects of digital twin applications and to explore the fields where surrogate models can be utilised advantageously. In this sense, the paper discusses what types of surrogate models are suitable for different practical problems as well as introduces the appropriate techniques for building and using these models. A number of examples of digital twin applications from both continuous processes and discrete manufacturing are presented to underline the potentials of utilising surrogate models. The surrogate models and model-building methods are categorised according to the area of applications. The importance of keeping these models up to date through their whole model life cycle is also highlighted. An industrial case study is also presented to demonstrate the applicability of the concept.

Role of pseudo-turbulent stresses in shocked particle clouds and construction of surrogate models for closure

Shock Waves ◽  
2018 ◽  
Vol 28 (3) ◽  
pp. 579-597 ◽  
Author(s):  
O. Sen ◽  
N. J. Gaul ◽  
S. Davis ◽  
K. K. Choi ◽  
G. Jacobs ◽  
...  
Keyword(s):  
Surrogate Models ◽  
Particle Clouds

The Role of Axial Flow in Near Wake on the Cross-Flow Vibration of the Inclined Cable of Cable-Stayed Bridges

2010 ◽  
Author(s):  
Masaru Matsumoto
Keyword(s):  
Vortex Shedding ◽  
Cross Flow ◽  
Axial Flow ◽  
Splitter Plate ◽  
Near Wake ◽  
Karman Vortex ◽  
The Cross ◽  
Wind Induced Vibration ◽  
Cable Stayed Bridges

Nowadays, the violent wind-induced vibration, including “rain-wind induced vibration” and “dry-galloping”, of stay-cables of cable-stayed bridges has become the most serious issue for bridge design. Up-to-date, the major factors for excitation of inclined cables have been clarified to be, for “rain-wind” induced vibration, the formation of “water-rivulet” on the particular position of upper cable surface, and, for “dry galloping”, the “axial flow” which flows in the near wake along cable-axis, and the effect of drag-force associated with Reynolds number, separately. However, the details of the effect of “axial flow” remain unsolved. Thus, this study aims to clarify the effect of axial flow in near wake on the aero-elastic vibration of inclined cables basing on various experiments. The mean velocity of axial flow was almost 60% of approaching wind velocity. Furthermore, the aerodynamic effect of the “axial flow” on cross-flow vibration of inclined cables is discussed in relation to the mitigation of Karman vortex shedding in near wake. Since the role of axial flow seems to be similar to the splitter plate installed in wake from the point of mitigation of Karman vortex shedding, to clarify the cross-flow response in relation to the mitigation of Karman vortex, the perforated ratio of the splitter plate was variously changed, then the similarity of effect of axial flow and the one of splitter plate was verified comparing their unsteady lift force-characteristics. In summary, it is shown that the axial flow on aerodynamic cross-flow vibration might excite like galloping similarly with the splitter plate by mitigation of Karman vortex.

Cable-Stayed Bridges and Role of Authorities – An Indian Scenario

2001 ◽  
Vol 84 (2) ◽  
pp. 32-39
Author(s):  
A Chakrabarti ◽  
B C Roy
Keyword(s):  
Cable Stayed Bridges ◽  
Indian Scenario
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