Railway Wheel Out-of-Roundness and Its Effects on Vehicle–Track Dynamics: A Review

2019 ◽  
pp. 41-64
Author(s):  
Xiao-Zhou Liu
Keyword(s):  
Railway Wheel ◽  
Track Dynamics

scholarly journals Cyclonic and anticyclonic contributions to atmospheric energetics

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Satoru Okajima ◽  
Hisashi Nakamura ◽  
Yohai Kaspi
Keyword(s):  
Storm Track ◽  
Mean Flow ◽  
Weather Variability ◽  
Jet Streams ◽  
Near Surface ◽  
Westerly Jet ◽  
Track Dynamics ◽  
New Findings ◽  
Atmospheric Energetics ◽  
Thermally Driven

AbstractMigratory cyclones and anticyclones account for most of the day-to-day weather variability in the extratropics. These transient eddies act to maintain the midlatitude jet streams by systematically transporting westerly momentum and heat. Yet, little is known about the separate contributions of cyclones and anticyclones to their interaction with the westerlies. Here, using a novel methodology for identifying cyclonic and anticyclonic vortices based on curvature, we quantify their separate contributions to atmospheric energetics and their feedback on the westerly jet streams as represented in Eulerian statistics. We show that climatological westerly acceleration by cyclonic vortices acts to dominantly reinforce the wintertime eddy-driven near-surface westerlies and associated cyclonic shear. Though less baroclinic and energetic, anticyclones still play an important role in transporting westerly momentum toward midlatitudes from the upper-tropospheric thermally driven jet core and carrying eddy energy downstream. These new findings have uncovered essential characteristics of atmospheric energetics, storm track dynamics and eddy-mean flow interaction.

Production of High-Quality Wheel Steel. Part 1. Production Aspects of Continuously-Cast Billet Quality for Railway Wheel Manufacture

Metallurgist ◽  
2021 ◽  
Author(s):  
D. A. Pumpyanskiy ◽  
S. V. Tyutyunik ◽  
E. A. Kolokolov ◽  
A. A. Mescheryachenko ◽  
I. S. Murzin ◽  
...  
Keyword(s):  
Steel Part ◽  
Wheel Steel ◽  
Cast Billet ◽  
High Quality ◽  
Railway Wheel ◽  
Billet Quality ◽  
Continuously Cast Billet ◽  
Continuously Cast

A two-level adaptive chirp mode decomposition method for the railway wheel flat detection under variable-speed conditions

2021 ◽  
Vol 498 ◽  
pp. 115963
Author(s):  
Shiqian Chen ◽  
Kaiyun Wang ◽  
Chao Chang ◽  
Bo Xie ◽  
Wanming Zhai
Keyword(s):  
Decomposition Method ◽  
Variable Speed ◽  
Railway Wheel ◽  
Mode Decomposition ◽  
Wheel Flat

Characteristics of Wheel Tread for Property Improvement of Railway Wheel

2006 ◽  
Vol 326-328 ◽  
pp. 1075-1078
Author(s):  
Seok Jin Kwon ◽  
Jung Won Seo ◽  
Hyun Mu Hur ◽  
Sung Tae Kwon
Keyword(s):  
Fracture Toughness ◽  
Low Temperature ◽  
Impact Energy ◽  
Low Cycle Fatigue ◽  
Maintenance Cost ◽  
Railway Vehicle ◽  
Cycle Fatigue ◽  
Railway Wheel ◽  
Mechanics Characteristics ◽  
Wheel Material

Despite of improvement of wheel material for railway vehicle, the damages of railway wheel have been occurred in service running. Because of wheel damage with spalling, shelling and thermal crack, the maintenance cost for the railway wheel has increased. The railway wheel had standardized but the chemical composition, the mechanical property and the hardness with respect to railway wheel is merely established. In order to reduce wheel damage, it is necessary to reinforce the standard of railway wheel. In present study, the fracture mechanics characteristics of railway wheel such as low cycle fatigue, fracture toughness, impact energy depended on low temperature and so on have tested. The result shows that the standard of railway wheel has to supplement fracture toughness and impact energy depended on low temperature etc.

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