scholarly journals Analysis of the Vibration Characteristics of a High-Speed Train using a Scale Model

2013 ◽  
Vol 16 (1) ◽  
pp. 7-13 ◽  
Author(s):  
Jae Hyun Han ◽  
Tae Min Kim ◽  
Jeung Tae Kim
Keyword(s):  
High Speed ◽  
Vibration Characteristics ◽  
Scale Model ◽  
High Speed Train

Investigation of speech privacy in high-speed train cabins using a 1:10 scale model

2014 ◽  
Vol 135 (4) ◽  
pp. 2365-2365
Author(s):  
Hansol Lim ◽  
Hyung Suk Jang ◽  
Jin Yong Jeon
Keyword(s):  
High Speed ◽  
Scale Model ◽  
High Speed Train

Passenger Train Slipstream Characterization Using a Rotating Rail Rig

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
N. Gil ◽  
C. J. Baker ◽  
C. Roberts ◽  
A. Quinn
Keyword(s):  
Boundary Layer ◽  
Turbulence Intensity ◽  
High Speed ◽  
Scale Model ◽  
High Speed Train ◽  
Measuring Time ◽  
Displacement Thickness ◽  
Time Histories ◽  
Attached Flow ◽  
Good Agreement

This paper presents the results of a new experimental technique to determine the structure of train slipstreams. The highly turbulent, nonstationary nature of the slipstreams make their measurement difficult and time consuming as in order to identify the trends of behavior several passings of the train have to be made. This new technique has been developed in order to minimize considerably the measuring time. It consists of a rotating rail rig to which a 1/50 scale model of a four car high speed train is attached. Flow velocities were measured using two multihole Cobra probes, positioned close to the model sides and top. Tests were carried out at different model speeds, although if the results were suitably normalized, the effect of model speed was not significant. Velocity time histories for each configuration were obtained from ensemble averages of the results of a large number of runs (of the order of 80). From these it was possible to define velocity and turbulence intensity contours along the train, as well as the displacement thickness of the boundary layer, allowing a more detailed analysis of the flow. Also, wavelet analysis was carried out on different runs to reveal details of the unsteady flow structure around the vehicle. It is concluded that, although this methodology introduces some problems, the results obtained with this technique are in good agreement with previous model and full scale measurements.

Aerodynamics of a scale model of a high-speed train on a streamlined deck in cross winds

2019 ◽  
Vol 91 ◽  
pp. 102717 ◽  
Author(s):  
Huan Li ◽  
Xuhui He ◽  
Hanfeng Wang ◽  
Ahsan Kareem
Keyword(s):  
High Speed ◽  
Scale Model ◽  
High Speed Train

Aerodynamic and Vibration Analysis of the Morphing Wings of a Hypersonic Vehicle

2020 ◽  
Author(s):  
Mohammad Khairul Habib Pulok ◽  
Uttam K. Chakravarty
Keyword(s):  
Vibration Analysis ◽  
High Speed ◽  
Thermal Loading ◽  
Hypersonic Vehicle ◽  
Vibration Characteristics ◽  
Scale Model ◽  
Small Scale ◽  
Hypersonic Vehicles ◽  
Morphing Wings ◽  
Wing Morphing

Abstract Hypersonic vehicles are receiving great attention in recent years due to their high speed and long-range capabilities. The shock waves come into consideration as a propagating disturbance for any aircraft when it exceeds the speed of sound. Complex environment and flight requirements of the hypersonic vehicles are leading the researchers to focus on several design considerations. Adaptive shape deformation is one of the prospective areas among them which has an impact on thermal loading, global and local load factors, vehicle acceleration, total energy dissipation, and fuel consumption. The wings play a key role in the aerodynamic performances of a flying machine; therefore, the overall performance of the hypersonic vehicle can be improved by applying morphing technologies on the wing. Morphing can help with reducing wave drag, increasing lift-to-drag ratio as well as enhancing flight endurance, and extending the range for a hypersonic vehicle. In this study, the telescopic wing morphing profile is considered for the aerodynamics and vibration analysis. The experimental validations of the aerodynamics and vibration characteristics are conducted by a wind-tunnel experiment and a vibration-testing arrangement, respectively, using a small-scale model of the wing. The computational analysis of the aerodynamics and vibration characteristics of the morphing wings are conducted and compared. Thus, a comprehensive study including the comparison between morphing modes can establish a standard to choose the appropriate morphing technique for the hypersonic vehicles.

scholarly journals Experimental Study and Numerical Analysis on the Vibration Characteristics of a Terraced Slope along an Embankment Section of a High-Speed Railway

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Wujian Yan ◽  
Haizhong Zheng ◽  
Zhijian Wu ◽  
Tong Wan ◽  
Xinxin Tian
Keyword(s):  
Elastic Modulus ◽  
High Speed ◽  
Field Experiments ◽  
Time History ◽  
Vibration Characteristics ◽  
High Speed Train ◽  
Ground Acceleration ◽  
Foundation Soil ◽  
The Time Domain ◽  
Terrace Level

The characteristics of the vibrations induced by the passage of a high-speed train do not only depend on the train speed, axle load, and track irregularity but also depend on the properties of the foundation soil and the surrounding topography. Estimating the vibration characteristics in different terrains is therefore essential. This study investigates the characteristics of propagation and attenuation of the vibrations induced by high-speed trains in loess-terraced slopes. The influence of the soil mechanical properties on the propagation of vibrations is analyzed through a numerical simulation. Field experiments are conducted to measure the vibration induced by a high-speed train at a loess-terraced slope site in Qin’an, Gansu, China. The measured acceleration time history is analyzed in the time domain and frequency domain. The results show that, at the edge of each terrace level, the vibration in the Y direction is the strongest, followed by those in the X and Z directions. The peak ground acceleration values are amplified in all three directions at the fourth terrace level. A model describing the vehicle-roadbed-foundation-terraced slope system is established to study the influence of the elastic modulus of the soil on the vibration characteristics. A change in the elastic modulus of the foundation soil is found to have an evident influence on the horizontal and vertical vibrations in each terrace level. However, a change in the elastic modulus of the soil in a terrace only affects the vibration in that terrace and in the adjacent ones, whereas it has no effect on the vibrations in terraces located farther away. This study can provide some reference values for slope reinforcement along railways.

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