Equivalent Stress Evaluation of the Load Spectrum Measured on the EMU Axle Based on Damage Tolerance

Zhou, Suxia

doi:10.3901/jme.2015.08.131

Cited by 8 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The equivalent stress of the weak point of the gearbox housing is calculated through finite element analysis or the stress spectrum of the travel route [10], and the probability distribution of the equivalent stress is regarded as the stress distribution of the gearbox housing. Based on Miner's law and the S-N curve of the gearbox housing material [34], the equivalent stress at the weak point of the gearbox housing is…”

Section: Dynamic Reliability Of the Gearbox Housingmentioning

confidence: 99%

Dynamic Reliability Evaluation of High-Speed Train Gearbox Based on Copula Function

Liu

Chen

2022

IEEE Access

View full text Add to dashboard Cite

As a key component of the high-speed train transmission system, the reliability of the gearbox directly affects the reliability and driving safety of the high-speed train. Taking the key parts in the gearbox: driving gear, driven gear, gearbox housing and bearing as the research object, the dynamic reliability of the gearbox is evaluated. First, combined with classical stress-strength interference theory, the number of stochastic loads is regarded as a Poisson process, and the strength degradation is described by the Gamma process, the Gamma strength degradation parameter of each part is determined from the part material or the part's P-S-N curve, and the reliability model of each key part of the gearbox is obtained. Second, the gearbox is regarded as a series system, and the Gumbel Copula function is introduced to deal with the nonlinear correlation between different parts and between different failure modes of the same part. The nesting relationship of the Copula function is determined, the parameter values of the Gumbel Copula function are determined based on the kernel density estimation and maximum likelihood estimation method, so as to establish the dynamic reliability model of the gearbox system and realize the evaluation of the dynamic reliability of the gearbox. The evaluation results show that the method for evaluating the reliability of high-speed train gearboxes is in line with engineering practice. The evaluation method has practical significance for the reliability check, optimization design and dynamic tracking of the gearbox reliability during the service period of the high-speed train gearbox.

show abstract

Section: Dynamic Reliability Of the Gearbox Housingmentioning

confidence: 99%

Dynamic Reliability Evaluation of High-Speed Train Gearbox Based on Copula Function

Liu

Chen

2022

IEEE Access

View full text Add to dashboard Cite

show abstract

“…Zhou et al 19 conducted a stress-time test of high-speed train axles along a rebuilt railway line and the Jingjin intercity railway line. The equivalent stress along the stress spectrum was studied with the presence of notches on the axles.…”

Section: Introductionmentioning

confidence: 99%

An analysis method for fatigue life of rail vehicle axles considering rotation effect of wheelset

Guo

Liu

2022

Advances in Mechanical Engineering

View full text Add to dashboard Cite

In this paper, the discrepancy between the calculated and actual fatigue life distribution trend of the axles of railway vehicle structures is corrected. The calculations were made using the traditional fixed-axle model in which the wheelset rotation is neglected in random vibration analysis. A correction method is proposed, which is based on the original methods of fatigue life analysis of the axle structure of railway vehicles (i.e. the pseudo-excitation method and finite element model) and according to the characteristics of the symmetrical axle structure and the actual rotational operation state of the railway vehicle wheelset. Taking a locomotive system as an example, the minimum fatigue life calculated by the fixed-axle model is only 0.81 million km. In contrast, the minimum fatigue life calculated by the proposed method is 5.85 million km, which is consistent with the actual fatigue life of the axle. The position of the minimum fatigue life is also consistent with the actual position. The reliability of the proposed method for calculating the random fatigue life of the axle structure is illustrated. The influence and contribution of the prestress generated by axle press-fitting and vehicle serving weight of the railway vehicle acting on the axle on the axle fatigue life were studied. The results show that the prestress has a different influence on the fatigue life reduction of the wheelset. The minimum fatigue life reduction can reach 16.68% when all the prestresses are considered. Therefore, the influence of prestress should be considered in the design of railway vehicle axle structures. The idea of considering prestress should be proposed when revising axle standards.

show abstract

“…Axles are usually designed with infinite life, but when the surface of the axle is damaged, the actual fatigue life of the axle will decay obviously. 1 With the improvement of the running speed of trains in China, the operating environment for trains becomes more complex, 2 and the probability of axle surface damage is also increasing. According to the statistics, nearly 30% of high-speed train axles are found to have surface damage in daily maintenance, in which foreign object damage (FOD) impact defects account for more than 50% of the total surface damage of axles.…”

Section: Introductionmentioning

confidence: 99%

Theoretical model of fatigue limit of full-size axle with different impact defects

Zhou

Duan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part F:

Self Cite

View full text Add to dashboard Cite

The impact defects on the surface of the axles of high-speed trains may cause hidden dangers to the safe operation of the trains. In order to study the influence of different shape defects on axle fatigue limit, the method of combining finite element simulation and fatigue test is adopted. According to the statistics of the foreign object damage impact defect of the axle in the workshop, impact defects were prefabricated on the axle specimen surface, stress analysis of the impact defect area was carried out, and then the more dangerous defect shape was obtained. Fatigue tests were carried out on prefabricated axle specimens. The P-S-N curves of each specimen group were fitted by the approximate Owen one-side tolerance limit method. In line with the fatigue test results of samples, considering the factors such as axle surface mass coefficient, size effect coefficient and load type, to ensure the security of the train operation, fatigue strength safety factor Sσ is introduced to establish a full-size axle fatigue prediction mathematical model. The fatigue limit of full-size axle with impact defects was predicted and the accuracy of the model was proved. Finally, on the basis of the defect shape, the modified EI Haddad model was used to fit the two-parameter theoretical model of defect depth and full-size axle fatigue limit, the standards were combined for safety assessment.

show abstract

Equivalent Stress Evaluation of the Load Spectrum Measured on the EMU Axle Based on Damage Tolerance

Cited by 8 publications

References 0 publications

Dynamic Reliability Evaluation of High-Speed Train Gearbox Based on Copula Function

Dynamic Reliability Evaluation of High-Speed Train Gearbox Based on Copula Function

An analysis method for fatigue life of rail vehicle axles considering rotation effect of wheelset

Theoretical model of fatigue limit of full-size axle with different impact defects

Contact Info

Product

Resources

About