Detection of Performance Deterioration of High-speed Train Wheels Based on Bayesian Dynamic Model

2017 ◽  
Author(s):  
Y. W. WANG ◽  
Y. Q. NI ◽  
X. WANG
Keyword(s):  
Dynamic Model ◽  
High Speed ◽  
High Speed Train ◽  
Performance Deterioration ◽  
Bayesian Dynamic Model

Failure Effects of Anti-Hunting Damper on High-Speed Train

2013 ◽  
Vol 694-697 ◽  
pp. 90-94 ◽  
Author(s):  
Ji Min Zhang ◽  
Li Wen Man
Keyword(s):  
Dynamic Model ◽  
High Speed ◽  
Critical Speed ◽  
Dynamic Performance ◽  
High Speed Train ◽  
Multi Body ◽  
Body Dynamic

The multi-body dynamic model of the high-speed train is established in order to study the failure effects of anti-hunting damper. Four kinds of failure case of the anti-hunting damper are compared, specifically including: one anti-hunting damper of the front bogie is broken; two anti-hunting dampers of the front bogie are broken; three anti-hunting dampers of the front bogie are broken; all four anti-hunting dampers of the front bogie are broken. The results have shown: when only one anti-hunting damper is broken, the influence to the dynamic performance of the high speed train is small, but once two anti-hunting dampers or more out of work, the critical speed of the vehicle decreases much more and the curve-passing performance also become worse.

Active Control of a High-Speed Pantograph

1997 ◽  
Vol 119 (1) ◽  
pp. 1-4 ◽  
Author(s):  
D. N. O’Connor ◽  
S. D. Eppinger ◽  
W. P. Seering ◽  
D. N. Wormley
Keyword(s):  
Dynamic Model ◽  
Active Control ◽  
Contact Force ◽  
High Speed ◽  
High Speed Train ◽  
Single Measurement ◽  
Force Variation ◽  
Catenary System ◽  
And Performance ◽  
And Control

The design and performance of an active controller for a pantograph which collects current for a high-speed train are considered. A dynamic model of the pantograph/catenary system is described and control objectives are established. A design which incorporates a frame-actuated controller and requires only a single measurement is described. Over an array of train speeds, the contact force variation with the actively controlled pantograph is 50 percent less than for the equivalent passive pantograph system.

Influence of a flexible wheelset on the dynamic responses of a high-speed railway car due to a wheel flat

2017 ◽  
Vol 232 (4) ◽  
pp. 1033-1048 ◽  
Author(s):  
Xingwen Wu ◽  
Subhash Rakheja ◽  
AKW Ahmed ◽  
Maoru Chi
Keyword(s):  
Dynamic Response ◽  
Dynamic Model ◽  
High Speed ◽  
Dynamic Responses ◽  
Vertical Acceleration ◽  
High Speed Train ◽  
Multibody Dynamic ◽  
Flexible Track ◽  
Wheel Flat ◽  
Track Slab

Large magnitude impact loads caused by wheel flats may excite various vibration modes of wheelsets employed in high-speed trains and thereby contribute considerably to the dynamic response of vehicles. In this study, the wheelset is modeled as a flexible body using the modal approach, which is integrated to a multibody dynamic model of the high-speed train coupled with a flexible track slab model. The multibody dynamic model is formulated for a typical high-speed train consisting of a car body, two bogie frames, and four wheelsets. The track is modeled considering the rail as a Timoshenko beam discretely supported on a flexible track slab. The effects of the wheelset flexibility on the dynamic response are illustrated through comparisons with those obtained with a rigid wheelset considering different vehicle speeds and sizes of the wheel flat. Subsequently, the effects of wheel flats on the vehicle–track system are evaluated in terms of the wheel–rail impact forces, axle-box vertical acceleration, and dynamic stress developed in the wheelset due to a haversine wheel flat. The results suggest that the wheelset flexibility can lead to significantly higher axle-box vibration and wheelset axle stress compared to a rigid wheelset in the presence of a wheel flat.

scholarly journals Dynamic Analysis of Historic Railway Bridges in Poland in the Context of Adjusting Them to Pendolino Trains

2015 ◽  
Vol 20 (2) ◽  
pp. 283-297 ◽  
Author(s):  
K. Grębowski ◽  
M. Zielińska
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Model ◽  
High Speed ◽  
Experimental Studies ◽  
Rolling Stock ◽  
Railway Bridge ◽  
High Speed Train ◽  
Railway Bridges ◽  
High Speed Trains ◽  
Identical Type

Abstract The article presents the dynamic analysis of the historic railway bridge in Tczew as an example of the usefulness of such type of bridge for high-speed trains. The model of the bridge and the simulation of rolling stock passage was performed in SOFISTIK program. The scope of work includes experimental studies, the solution of the problem concerning the correct solution features of the dynamic model which takes into account the dependencies between the bridge, track and rolling - stock (RBT). The verification of the model was performed by comparing the results obtained on site during the passage of ET-22 locomotive and twenty (20) open goods wagons with the results obtained in the program for the identical type of rolling stock used to the simulation Pendolino train. Then, after the verification, the simulation of high-speed train passage was performed. The speed of the train passage varied from 150 [km/h] to the max. possible speed of 250 [km/h] which PENDOLINO train, approved for the simulation, may reach. Under the analysis of obtained results it was possible to define the conditions for adjusting the historic bridge to high-speed train passage.

Analysis of the influence of magnetic stiffness on running stability in a high-speed train propelled by a superconducting linear synchronous motor

2018 ◽  
Vol 233 (2) ◽  
pp. 170-186 ◽  
Author(s):  
Jin-Ho Lee ◽  
Chang-Young Lee ◽  
Jeong-Min Jo ◽  
Jungyoul Lim ◽  
Jaeheon Choe ◽  
...  
Keyword(s):  
Dynamic Model ◽  
High Speed ◽  
Synchronous Motor ◽  
High Speed Train ◽  
Traction Motor ◽  
Magnetic Stiffness ◽  
Linear Synchronous Motor ◽  
The Stability

There are two major obstacles that prevent a conventional train from achieving high speed: the limitation of wheel–rail adhesion and the increase of instability in the wheel–rail running dynamics. To overcome these problems, a new hybrid train model is introduced in this study. This train utilizes a superconducting linear synchronous motor (SC-LSM), instead of a traction motor, for propulsion; therefore, this train does not have the limitation of adhesion between the wheel and the rail. Using an SC-LSM also improves the stability of the train during high-speed operations. The magnetic stiffness between the train and the guideway is additionally generated by using the SC-LSM, which is favorable for the running stability at a high speed. This study focuses on the magnetic stiffness and its effect on the running stability in the proposed hybrid train model. First, the magnetic stiffness in the SC-LSM is investigated both theoretically and experimentally. Then, a train dynamic model including the magnetic stiffness is developed and the effect of magnetic stiffness on the running stability is analyzed through various simulations.

scholarly journals Establishment of Dynamic Model of axle Box Bearing of high-speed Train under Variable Speed Conditions

2021 ◽  
Author(s):  
Yongqiang Liu ◽  
Baosen Wang ◽  
Bin Zhang ◽  
Shaopu Yang
Keyword(s):  
Dynamic Model ◽  
High Speed ◽  
Vibration Signal ◽  
Operating Conditions ◽  
Single Frequency ◽  
Variable Speed ◽  
High Speed Train ◽  
Ring Fault ◽  
Mass Eccentricity ◽  
Simulation Results

Abstract This paper establishes a dynamic model of the bearing rotor system of a high-speed train under variable speed conditions. Different from previous works, the proposed model simplifies the contact stress and considers the compensation balance excitation caused by the rotor mass eccentricity. The angle iteration method is used to solve the challenging problem that the roller space position cannot be determined in bearing rotation. The simulation results show that the model accurately describes the dynamics of bearing under varying speed profiles that contain acceleration, deceleration and speed oscillation stages. The order ratio spectrum of the bearing vibration signal indicates that both single frequency and multiple frequency in simulation results are consistent with that in theoretical results. Experiments of bearing with outer ring fault and inner ring fault under various operating conditions are presented to verify the developed model.

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