Stability of a Flexible Wheelset for High Speed Rail Vehicles With Constant and Varying Parameters

1998 ◽  
Vol 120 (4) ◽  
pp. 997-1002 ◽  
Author(s):  
J. Lieh ◽  
J. Yin
Keyword(s):  
High Speed ◽  
State Transition ◽  
Time Varying ◽  
Vehicle Dynamic ◽  
High Speed Rail ◽  
Rail Vehicles ◽  
Flexible Wheelset ◽  
The Stability ◽  
Time Varying Models ◽  
Stability Concept

The stability of an elastic wheelset coupled with torsional spring and damper is studied in this paper. With flexible elements between two wheels, the advantages of both rigid and independently rotating wheel systems may be obtained. Previous investigations indicated that axle flexibility will affect the vehicle dynamic behavior and an optimal design may improve the system performance. Those studies were limited to constant wheel/rail geometry as the wheelset rolls along the track. In this paper, it is intended to determine the critical speed regions for both constant and time-varying models. The variation in conicity is assumed to be periodic thus the Floquet stability concept may be employed. The computation of the state-transition matrix is based on a Runge-Kutta algorithm.

scholarly journals Field Measurements of Vibration on the Car Body-Suspended Equipment for High-Speed Rail Vehicles

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Jinying Guo ◽  
Huailong Shi ◽  
Fansong Li ◽  
Pingbo Wu
Keyword(s):  
High Speed ◽  
Field Measurements ◽  
Railway Vehicle ◽  
Elastic Suspension ◽  
High Speed Rail ◽  
Test Configuration ◽  
Car Body ◽  
Rail Vehicles ◽  
Frequency Domains ◽  
Low Pass

The vibrations in the flexible car bodies of the high-speed electric multiple units (EMUs) and their coupling effects with the bogies and other types of equipment vibrating have lead issues for railway operators and gained interest for researchers. Other than a numerical investigation, field measurements on the vibrating characteristics of the car body (CB) and its suspended equipment (CBSE) for a high-speed railway vehicle were performed to elaborate the vibrating characteristics on the CB and its CBSE. In this long-term tracking test, the running stability of vehicle and wheel-rail interaction were also examined with the increase of operation distance (OD), a total of 2,400,000 km. The test configuration and arrangements are introduced first, followed by the data analysis in time and frequency domains. It is seen that the wheelset conicity increases 0.008 per 10,000 km, which increases approximately linearly with the OD from 0.10 to 0.40. Two types of wheel treads, S1002CN and LMB10, have different ranges in conicity and reprofiling cycles. The lateral accelerations on CB in a downward-running case (0.5 g) are much greater than that in upward-running case (0.2 g) corresponding to the vehicle stability differences. The 15 Hz low-pass filtered acceleration on CB experiences a maximum of 0.10 g and an averaged amplitude around 0.05 g, whereas the frequency spectrum has peaks of 0.01 g on CB and 0.1 g on CBSE. It states that an elastic suspension between the CBSE and the CB prevents the high-frequency vibration from the CB.

scholarly journals Application of the Flame-Retardant Magnesium Alloy to High Speed Rail Vehicles

Materia Japan ◽  
2013 ◽  
Vol 52 (10) ◽  
pp. 484-490 ◽  
Author(s):  
Hisashi Mori ◽  
Kenji Fujino ◽  
Ken Kurita ◽  
Yasumasa Chino ◽  
Naobumi Saito ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Flame Retardant ◽  
High Speed ◽  
High Speed Rail ◽  
Rail Vehicles
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