Influence of long-wavelength track irregularities on the motion of a high-speed train

2017 ◽  
Vol 56 (1) ◽  
pp. 95-112 ◽  
Author(s):  
C. F. Hung ◽  
W. L. Hsu
Keyword(s):  
High Speed ◽  
High Speed Train ◽  
Long Wavelength ◽  
Track Irregularities

scholarly journals Random Response Analysis of Axle-Box Bearing of a High-Speed Train Excited by Crosswinds and Track Irregularities

2019 ◽  
Vol 68 (11) ◽  
pp. 10607-10617 ◽  
Author(s):  
Zhiwei Wang ◽  
Yang Song ◽  
Zhonghui Yin ◽  
Ruichen Wang ◽  
Weihua Zhang
Keyword(s):  
High Speed ◽  
Response Analysis ◽  
Random Response ◽  
High Speed Train ◽  
Track Irregularities

Vibration analysis of the axle bearings considering the combined errors for a high-speed train

2020 ◽  
Vol 234 (3) ◽  
pp. 481-497
Author(s):  
Jing Liu ◽  
Xinbin Li ◽  
Wennian Yu
Keyword(s):  
High Speed ◽  
Error Model ◽  
Manufacturing Processes ◽  
High Speed Train ◽  
The Road ◽  
Critical Elements ◽  
Proposed Model ◽  
Manufacturing Errors ◽  
High Speed Trains ◽  
Track Irregularities

Axle bearings are critical elements of high-speed trains. Although the quality and precision of axle bearings have been significantly improved, the manufacturing errors, such as the roundness and waviness errors, cannot be eliminated during their manufacturing processes. The axle bearings with the roundness and waviness errors have great influences on vibration performances of the high-speed trains. To obtain an in-depth understanding of the vibrations caused by the axle bearing with the combined errors considering both the roundness and waviness errors. This work conducts an improved analytical model for a high-speed train considering the axle bearings with the combined errors, which cannot be formulated by the previous train model considering single roundness or waviness errors. The combined errors are defined to include both the roundness and waviness errors. A new multiple cosine function is presented to model the combined errors. The time-depended force excitations produced by the combined errors are also considered in the dynamic model. A track irregularities model is utilized to formulate the road spectrum displacement excitations from the rail and roadbed. The influences of the error amplitude and order on the vibrations of high-speed train are analyzed. The results for the single roundness error model, single waviness error model, and combined errors model are compared to represent the superiority of proposed model. It depicts that this work can provide a more reasonable analytical method for understanding the vibrations of high-speed train considering the axle bearings with the combined manufacturing errors compared to the reported single error models.

Effect of track irregularities of high-speed railways on the thermal characteristics of the traction motor bearing

2020 ◽  
Vol 235 (1) ◽  
pp. 22-34
Author(s):  
Tingting Wang ◽  
Zhiwei Wang ◽  
Dongli Song ◽  
Weihua Zhang ◽  
Jiayuan Li ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Power Loss ◽  
High Speed ◽  
Operating Temperature ◽  
Thermal Characteristics ◽  
High Speed Train ◽  
Analysis Model ◽  
Traction Motor ◽  
Track Irregularities ◽  
Motor Bearing

The operating temperature plays a key role in the service reliability of ball bearings used in the traction motor of high-speed trains. Studies on the heat generation and temperature distributions of the bearing under the vehicle vibration environment are critical for designing the high-speed train traction motor bearing and to monitor its operation. In this paper, an SKF friction torque model that considers the inlet shear heating reduction and kinematic replenishment/starvation reduction was used to calculate the power loss of the bearing operating in a high-speed train. A thermal analysis model of the bearing, which takes into account the vehicle vibration due to track irregularities, was developed to study the thermal characteristics of the bearing operating in a high-speed train. Experiments were conducted on a service high-speed train (i.e. CRH380B) to validate the proposed bearing thermal analysis model. The thermal characteristics of the bearing and the influence of key factors on the operating temperature of the bearing under vehicle vibration due to track irregularities were studied with the proposed bearing thermal analysis model. The results show that the thermal failure of the bearing subassemblies most likely occurs at the balls region owing to the highest temperature in that region, compared to the inner and outer raceway of the bearing. The method of applying grease with appropriate kinematic viscosity should be adopted to reduce the power loss of bearing while meeting the lubrication requirement. The vehicle vibration due to track irregularities significantly influences the thermal characteristics of high-speed train motor bearings, which cannot be ignored in the thermal analysis of bearings operating in a high-speed train.

scholarly journals Effect of Long-Wavelength Track Irregularities on Vehicle Dynamic Responses

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Tao Xin ◽  
Pengsong Wang ◽  
Yu Ding
Keyword(s):  
High Speed ◽  
Ride Comfort ◽  
Dynamic Responses ◽  
Vehicle Dynamic ◽  
Long Wavelength ◽  
High Speed Trains ◽  
Train Speed ◽  
Coupling Dynamic ◽  
Track Irregularities

Long-wavelength track irregularities have obvious influence on ride comfort and running stability of high-speed trains. Meanwhile, it brings risk to the inspection of track irregularities since ordinary inspection equipment has difficulties in covering long wavelengths. Previous research on the effect of long-wavelength track irregularities is rare. In order to find the relationship between long-wavelength irregularities and vehicle dynamic responses, a numerical vehicle-track coupling dynamic model based on multibody dynamics and finite element theories is established by using a self-compiling program. One case study is given as an example to show the methodology of determining the sensitive long wavelength and management amplitude of track longitudinal-level irregularities in high-speed railway. The simulation results show that the sensitive long wavelength has a strong correlation with train speed and natural frequency. The simulation and field test results are in good agreement.

scholarly journals Effect of random track irregularities on selected composite bridge / track structure / high-speed train system vibrations

2013 ◽  
Vol 12 (1) ◽  
pp. 259-266
Author(s):  
Monika Podworna ◽  
Marian Klasztorny
Keyword(s):  
High Speed ◽  
Contact Stiffness ◽  
Track Structure ◽  
Computer Algorithms ◽  
High Speed Train ◽  
Approach Slabs ◽  
Composite Bridge ◽  
Random Track Irregularities ◽  
Train System ◽  
Track Irregularities

A theory of the quasi-exact physical and mathematical modelling of the composite (steel–concrete) bridge / ballasted track structure / high-speed train system (BTT) was developed, including viscoelastic suspensions of rail-vehicles on two-axle bogies, the non-linear Hertz contact stiffness and one-sided contact between the wheel sets and the rails, the viscoelastic and inertia features of the bridge, the viscoelastic track structure on and beyond the bridge, the approach slabs, and random track irregularities. Based on this theory, advanced computer algorithms for the BTT numerical modelling were written and a computer program to simulate the vertical vibrations of the BTT systems was developed. The bridge subject to the preliminary dynamic analysis and designed according to Polish standards has a 15.00 m span length. The bridge was loaded by the German ICE-3 high-speed train moving at the critical (180 and 270 km/h) and the maximum (300 km/h) operating speeds.

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