Unsteady Aerodynamic Loads of High-speed Trains under Stochastic Winds

2012 ◽  
Vol 48 (20) ◽  
pp. 113 ◽  
Author(s):  
Mengge YU
Keyword(s):  
High Speed ◽  
Aerodynamic Loads ◽  
Unsteady Aerodynamic ◽  
High Speed Trains

Vehicle dynamics of a high-speed passenger car due to aerodynamics inside tunnels

2007 ◽  
Vol 221 (4) ◽  
pp. 527-545 ◽  
Author(s):  
B Diedrichs ◽  
M Berg ◽  
S Stichel ◽  
S Krajnović
Keyword(s):  
Vehicle Dynamics ◽  
High Speed ◽  
Ride Comfort ◽  
Sensitivity Study ◽  
Response Analysis ◽  
Vehicle Dynamic ◽  
Aerodynamic Loads ◽  
Car Body ◽  
Unsteady Aerodynamic ◽  
Multi Body

High train speeds inside narrow double-track tunnels using light car bodies can reduce the ride comfort of trains as a consequence of the unsteadiness of the aerodynamics. This fact was substantiated in Japan with the introduction of the series 300 Shinkansen trains more than a decade ago, where the train speed is very high also in relatively narrow tunnels on the Sanyo line. The current work considers the resulting effects of vehicle dynamics and ride comfort with multi-body dynamics using a model of the end car of the German high-speed train ICE 2. The present efforts are different from traditional vehicle dynamic studies, where disturbances are introduced through the track only. Here disturbances are also applied to the car body, which conventional suspension systems are not designed to cope with. Vehicle dynamic implications of unsteady aerodynamic loads from a previous study are examined. These loads were obtained with large eddy simulations based on the geometry of the ICE 2 and Shinkansen 300 trains. A sensitivity study of some relevant vehicle parameters is carried out with frequency response analysis (FRA) and time domain simulations. A comparison of these two approaches shows that results which are obtained with the much swifter FRA technique are accurate also for sizable unsteady aerodynamic loads. FRA is, therefore, shown to be a useful tool to predict ride comfort in the current context. The car body mass is found to be a key parameter for car body vibrations, where loads are applied directly to the car body. For the current vehicle model, a mass reduction of the car body is predicted to be most momentous in the vicinity of 2 Hz.

Condition diagnostics of Russian railways infrastructure constructions under aerodynamic loads from high-speed trains

2014 ◽  
Vol 75 (3) ◽  
pp. 580-586
Author(s):  
S. M. Kaplunov ◽  
N. G. Valles ◽  
V. Yu. Fursov ◽  
A. M. Belostotskii ◽  
S. I. Dubinskii
Keyword(s):  
High Speed ◽  
Aerodynamic Loads ◽  
High Speed Trains

scholarly journals Sudden Variation Effect of Aerodynamic Loads and Safety Analysis of Running Trains When Entering Tunnel Under Crosswind

2020 ◽  
Vol 10 (4) ◽  
pp. 1445 ◽  
Author(s):  
Weichao Yang ◽  
E Deng ◽  
Zhihui Zhu ◽  
Mingfeng Lei ◽  
Chenghua Shi ◽  
...  
Keyword(s):  
High Speed ◽  
Coupling Effect ◽  
Reduction Rate ◽  
Interaction Model ◽  
Train Track ◽  
Wheel Load ◽  
Safety Risk ◽  
Aerodynamic Loads ◽  
Track System ◽  
High Speed Trains

Sudden variation of aerodynamic loads is a potential source of safety accidents of high-speed trains (HSTs). As a follow-up investigation on the aerodynamic response of a HST that enters a tunnel under crosswind environment, this paper focuses on the transient response of a HST’s safety indices based on the train–track coupling interaction model. Firstly, a wind–train–track coupling dynamic model is proposed by introducing transient aerodynamic loads into the vehicle–track system. Secondly, the temporal evolution of safety coefficients indicates that the train’s safety risk increases during tunnel entry with crosswind. Results show that the derailment coefficients and wheel load reduction rate during tunnel entry are not only larger than those in open air, but also those inside the tunnel are due to the sudden disappearance of wind excitation at the tunnel entrance. In addition, the characteristic wind curve, which is the wind velocity against the train speed, is presented for application based on the current specification of the safety criteria threshold. The investigation will be useful in assessing the safety risk of a running train subjected to other aerodynamic attacks, such as the coupling effect of an infrastructure scenario and crosswind in a windy area.

Sign in / Sign up

Export Citation Format

Share Document