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

Wang, Tingting; Wang, Zhiwei; Song, Dongli; Zhang, Weihua; Li, Jiayuan; Chen, De

doi:10.1177/0954409720902359

Cited by 19 publications

(11 citation statements)

References 18 publications

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“…The single−stage spur gear transmission is widely employed in gear transmissions in locomotives [8][9][10][11][12]21,22,27]. The traction torque generated from the traction motor is transmitted to the wheel-rail interface via the flexible teeth deformation of the gear pair along the line of action which is represented by a spring-damper element (K m , C m ).…”

Section: Mesh Forces Of Gear Transmissionmentioning

confidence: 99%

“…Chen et al [8] further considered the power transmission path of the locomotive and developed a locomotive−track coupled dynamics model with gear transmissions to research the dynamic responses of the gear transmissions and the influence of the tooth root crack on the whole coupled system. Liu et al [9][10][11] and Wang et al [12], respectively, analyzed the dynamic and thermal characteristics of the motor bearings in the vibration environment of a locomotive or a high−speed train.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Influence of Wheel Flat on Fatigue Life of the Traction Motor Bearing in Vibration Environment of a Locomotive

et al. 2021

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Wheel flat can cause a large impact between the wheel and rail and excites a forced vibration in the locomotive and track structure systems. The working conditions and fatigue life of the motor bearings are significantly affected by the intensified wheel–rail interaction via the transmission path of the gear mesh. In this study, a fatigue life prediction method of the traction motor bearings in a locomotive is proposed. Based on the L−P theory or ISO 281 combined with the Miner linear damage theory and vehicle–track coupled dynamics, the irregular loads induced by the track random irregularity and gear mesh are considered in this proposed method. It can greatly increase the accuracy of predictions compared with the traditional prediction models of a rolling bearing life whose bearing loads are assumed to be constant. The results indicate that the periodic impact forces and larger mesh forces caused by the wheel flat will reduce the fatigue life of the motor bearings, especially when the flat length is larger than 30 mm. Using this method, the effects of the flat length and relatively constant velocity of the locomotive are analyzed. The proposed method can provide a theoretical basis to guarantee safe and reliable working for motor bearings.

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Section: Mesh Forces Of Gear Transmissionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Influence of Wheel Flat on Fatigue Life of the Traction Motor Bearing in Vibration Environment of a Locomotive

et al. 2021

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“…The radial force on cylindrical roller bearings of traction motor caused by track irregularities using the vehicle dynamics model established in the SIMPACK software (Wang et al, 2020) is shown in Figure 5.…”

Section: Bearing Load Due To Vehicle Environmentmentioning

confidence: 99%

“…Ge (2016) and Wang et al (2019) analyze the influence of the track irregularity impacts on the dynamical behavior of axle bearing. Wang et al (2020) studied the effect of the track irregularity on the thermal characteristics of traction motor bearing. In this paper, we mainly consider the influence of the track irregularity on the bearing load, and then the thermal characteristics.…”

Section: Introductionmentioning

confidence: 99%

Effect of unbalanced magnetic pull on the thermal characteristics of traction motor bearing

Wang¹,

Song²,

Zhang³

et al. 2021

ILT

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Purpose The purpose of this paper is to analyze the unbalanced magnetic pull (UMP) of the rotor of traction motor and the influence of the UMP on thermal characteristics of traction motor bearing. Design/methodology/approach The unbalanced magnetic pull on the rotor with different eccentricity was calculated by Fourier series expansion method. A bearing thermal analysis finite element model considering both the vibration of high-speed train caused by track irregularity and the UMP of traction motor rotor was established. The validity of the model is verified by experimental data obtained from a service high-speed train. Findings The results show that thermal failure of bearing subassemblies most likely occurs at contact area between the inner ring and rollers. The UMP of rotor of traction motor has a significant effect on the temperature of the inner ring and roller of the bearing. When the eccentricity is 10%, the temperature can even be increased by about 12°C. Therefore, the UMP of rotor of traction motor must be considered in thermal analysis of traction motor bearing. Originality/value In the thermal analysis of the bearing of the traction motor of high-speed train, the UMP of the rotor of the traction motor is considered for the first time

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“…Xu et al [17] focused on the effect of the system spatial variability on the vehicle-track coupled system using the method of statistics. Huang et al [18] and Wang et al [19], respectively, investigated the dynamic characteristics of the vehicle and the thermal characteristics of the motor bearing using SIMPACK. Based on the typical vehicle-track coupled dynamics model and a calculation method for the time-varying gear mesh stiffness, Chen et al [20] and Liu et al [21] proposed a planar locomotive-track coupled dynamics model considering the detailed traction power transmission path.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of traction motor in a locomotive considering surface waviness on races of a motor bearing

Liu

Chen

et al. 2021

Rail. Eng. Science

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The traction motor is the power source of the locomotive. If the surface waviness occurs on the races of the motor bearing, it will cause abnormal vibration and noise, accelerate fatigue and wear, and seriously affect the stability and safety of the traction power transmission. In this paper, an excitation model coupling the time-varying displacement and contact stiffness excitations is adopted to investigate the effect of the surface waviness of the motor bearing on the traction motor under the excitation from the locomotive-track coupled system. The detailed mechanical power transmission path and the internal/external excitations (e.g., wheel–rail interaction, gear mesh, and internal interactions of the rolling bearing) of the locomotive are comprehensively considered to provide accurate dynamic loads for the traction motor. Effects of the wavenumber and amplitude of the surface waviness on the traction motor and its neighbor components of the locomotive are investigated. The results indicate that controlling the amplitude of the waviness and avoiding the wavenumber being an integer multiple of the number of the rollers are helpful for reducing the abnormal vibration and noise of the traction motor.

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

Cited by 19 publications

References 18 publications

Dynamic Influence of Wheel Flat on Fatigue Life of the Traction Motor Bearing in Vibration Environment of a Locomotive

Dynamic Influence of Wheel Flat on Fatigue Life of the Traction Motor Bearing in Vibration Environment of a Locomotive

Effect of unbalanced magnetic pull on the thermal characteristics of traction motor bearing

Dynamic analysis of traction motor in a locomotive considering surface waviness on races of a motor bearing

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