A Direct Method for Analysing the Nonlinear Vehicle-Structure Interaction in High-Speed Railway Lines

2014 ◽  
Author(s):  
S.G.M. Neves ◽  
P.A. Montenegro ◽  
A.F.M. Azevedo ◽  
R. Calçada
Keyword(s):  
High Speed ◽  
Direct Method ◽  
High Speed Railway ◽  
Structure Interaction ◽  
Vehicle Structure ◽  
A Direct Method

scholarly journals A direct method for analyzing the vertical vehicle–structure interaction

2012 ◽  
Vol 34 ◽  
pp. 414-420 ◽  
Author(s):  
S.G.M. Neves ◽  
A.F.M. Azevedo ◽  
R. Calçada
Keyword(s):  
Direct Method ◽  
Structure Interaction ◽  
Vehicle Structure ◽  
A Direct Method

scholarly journals A direct method for analyzing the nonlinear vehicle–structure interaction

2014 ◽  
Vol 69 ◽  
pp. 83-89 ◽  
Author(s):  
S.G.M. Neves ◽  
P.A. Montenegro ◽  
A.F.M. Azevedo ◽  
R. Calçada
Keyword(s):  
Direct Method ◽  
Structure Interaction ◽  
Vehicle Structure ◽  
A Direct Method

scholarly journals Verification and application of bird strike analysis for the design of high-speed helicopter composite cowlings

2021 ◽  
Vol 349 ◽  
pp. 04011
Author(s):  
Radek Doubrava ◽  
Martin Oberthor ◽  
Petr Bělský ◽  
Bohuslav Cabrnoch
Keyword(s):  
Numerical Simulation ◽  
High Speed ◽  
Direct Method ◽  
Bird Strike ◽  
Aircraft Structures ◽  
Important Phenomenon ◽  
Impact Experiment ◽  
Bird Impact ◽  
Impact Experiments ◽  
A Direct Method

Bird strikes are an important phenomenon that must be taken into consideration when designing aircraft. A bird impact experiment provides a direct method to examine the bird strike resistance. However, the design of the aircraft structures usually involves many iterations of design-manufacturing-test and conducting bird impact experiments is not only time consuming but also costly. The aim of this work is to show the application of test verified numerical simulation for the design of composite cowlings of the high-speed helicopter.

High-Speed Vehicle Models Based on a New Concept of Vehicle/Structure Interaction Component: Part I—Formulation

1993 ◽  
Vol 115 (1) ◽  
pp. 140-147 ◽  
Author(s):  
L. Vu-Quoc ◽  
M. Olsson
Keyword(s):  
Nonlinear Equations ◽  
Building Block ◽  
High Speed ◽  
Equations Of Motion ◽  
Interaction Model ◽  
Component Part ◽  
Structure Interaction ◽  
Vehicle Structure ◽  
Interaction Component ◽  
High Speed Vehicle

High-speed vehicle/structure models constructed based on a new formulation of dynamic interaction between high-speed vehicles and flexible guideways are presented. A basic vehicle/structure interaction model forms a basic building block of complex vehicle/structure models in which lumped-parameter sub-components of the vehicle component (e.g., suspended masses with springs and dashpots) are assembled onto the basic vehicle/structure interaction component. A vertical and an inclined vehicle models are formulated. These vehicle models can serve as yet more advanced building-block models in the hierarchical construction of complex vehicle/structure models. The inclined vehicle model can be used to study the effects of braking of high-speed vehicles of flexible guideways. Fully nonlinear equations of motion of both models are given. Upon introducing approximations to the nonlinear kinematics, mildly nonlinear equations with an unusual mathematical structure are consistently derived. These equations are appropriate for use under realistic working conditions of the system, and are particularly amenable for numerical treatment using a recently proposed class of predictor/corrector algorithms.

A direct method-based strength evaluation of the cast aluminum beam used in a high-speed train

2019 ◽  
Vol 233 (9) ◽  
pp. 896-905
Author(s):  
Songhua Huang ◽  
Yugong Xu ◽  
Alexander Bezold ◽  
Lele Zhang ◽  
Geng Chen ◽  
...  
Keyword(s):  
High Speed ◽  
Direct Method ◽  
Weight Ratio ◽  
Rolling Stock ◽  
High Speed Train ◽  
Cast Aluminum ◽  
Aluminum Casting ◽  
Beam Structure ◽  
Aluminum Beam ◽  
A Direct Method

In this paper, the authors elaborate how numerical techniques developed from the direct method can be used to predict the load-bearing capacity of the aluminum casting beam structure which is presently used in the Chinese high-speed train CRH5A. The numerical method introduced in this paper is formulated based on the Melan's static theorem; thus, it determines the strength of the cast aluminum beam under both monotonic and cyclic loads without following the entire load profile. In addition to constructing the plastic and shakedown limits of the component, the proposed approach is also employed to study how stiffeners' thickness on the key areas influences the feasible load domains. Based on the intensive sensitivity analysis, an optimal thickness has been determined which gives the highest strength-to-weight ratio. To this end, the paper confirms that the direct method is a viable means for designing structures used in the rolling stock.

scholarly journals Seismic Vulnerability Assessment of High-Speed Railway Bridges Using Fragility Curves and Considering Soil-Structure Interaction

2020 ◽  
Vol 16 (1) ◽  
pp. 39-48
Author(s):  
Parham Bakhtiari ◽  
Khosro Bargi
Keyword(s):  
High Speed ◽  
Soil Structure ◽  
Seismic Vulnerability ◽  
Fragility Curves ◽  
Damage Index ◽  
Soil Structure Interaction ◽  
Limit States ◽  
High Speed Railway ◽  
Railway Bridges ◽  
Structure Interaction

AbstractThe assessment of the seismic behavior of the high-speed railway bridges is necessary because of the strategic essence of these structures. Evaluating and predicting damages of the bridges that originated by earthquakes with various intensities can provide useful information, which is very helpful in the management of the possible crises. One of the most useful mechanisms for estimating earthquake damages to these bridges is the development of fragility curves for them. Studies on the production of fragility curves on the high-speed railway bridges are limited. In this research, the fragility curve is plotted for two high-speed railway bridges with different pier heights. Due to the differences in the height of these bridges, a comparison of the performance of these structures is also shown. The model of the high-speed railway bridge was created for each model separately in the SeismoStruct software. The soil-structure interaction is also modeled as springs, and its effects are considered. Nonlinear models are also used to model concrete and steel materials. Then, the incremental dynamic analysis was performed under different ground motion records. By using the obtained data from the analysis, appropriate damage states were selected, and finally, the fragility curves were plotted for different performance limit states. The results showed that with increasing pier height, the damage index was raised and for a constant probability of exceedance, the taller pier is demanded a lower spectral acceleration to achieve a performance level.

scholarly journals Optimization of High-Speed Railway Line Planning Considering Extra-Long Distance Transportation

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Ying Wang ◽  
Qi-Yuan Peng ◽  
Ling Liu ◽  
Jia-Kang Wang
Keyword(s):  
High Speed ◽  
Direct Method ◽  
Long Distance ◽  
Line Planning ◽  
High Speed Railway ◽  
Railway Line ◽  
Market Competitiveness ◽  
Network Operation ◽  
Transfer Method ◽  
Optimizing Model

Network line planning optimal considering extra-long distance transportation can adapt to high-speed railway (HSR) network operation environment and meet the demand of extra-long distance travel. First, the distance of 1500 km or more is defined as extra-long transportation distance based on market competitiveness. The difficulties of direct or transfer transportation for extra-long distance transportation are analyzed. Direct method of extra-long distance is determined according to direct passenger volume and the number of important nodes while transfer method is represented considering transfer times, organization forms, varieties of schemes, and comfort. Then, ideas of optimizing line plan based on riding scheme is put forward. Network optimizing line plan model with riding scheme is developed considering extra-long distance transportation. The model which minimizes traveling cost and train running expense optimizes train frequency and train stop plan with riding scheme. Last, the method and optimizing model is verified by the network which took Baoji–Lanzhou HSR as the core. The optimal result is a benefit to improve operation efficiency and market competitiveness of HSR.

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