Fatigue damage and reliability assessment of subway train bogie frames under operating conditions

Wang, Binjie; Sun, Shouguang; Ma, Shuang; Wang, Xi

doi:10.1177/1687814020903590

Cited by 9 publications

(3 citation statements)

References 17 publications

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“…The value of m in the S-N curve is 3.5 and a fatigue limit of 70 MPa with the corresponding number of cycles N = 2 3 10 6 cycles is suggested which is widely used for bogie frame in this paper. 50 As shown in Table 4, the damage calculated from the RFC method in different sections which are corresponding to Figure 18(a) and (b) is lower than that from the Dirlik method and the deviations are within 22%.…”

Section: Fatigue Stress Estimation and Damage Evaluationmentioning

confidence: 85%

Fatigue stress estimation of metro bogie frame through frequency response functions by using limited sensors

Sun

Lai

et al. 2023

Structural Health Monitoring

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In this paper, the fatigue state estimation of the metro bogie frame is discussed based on limited sensors through frequency domain methods. The middle-frequency and high-frequency vibration fatigue damage cases of one metro bogie frame is discussed. The main excitations come from the wheel/rail interactions including wheel out-of-roundness and rail irregularities. The most common modal vibration of the bogie frame, where the transom bending deformation is dominant, is taken as the research object to study the possibilities of fatigue failure monitoring on concerned points of the bogie frame transom focusing on specific transfer paths. To eliminate unnecessary input signals which are not closely related to the occurrence of large stress amplitudes, the coherence analysis of different loads including the transmission load, carbody load and wheel-rail impact load is conducted through various methods including the short-time Fourier transform spectrum analysis, the magnitude-squared coherence analysis and the partial directed coherence analysis. Then the power spectral densities (PSDs) of the measured accelerations and cross power spectral densities (CPSDs) are calculated to obtain the transfer functions, whose output is the Y-axis stress at the concerned point. The stress PSDs are obtained using the instantly measured input accelerations and the prepared transfer function. Then the spectral moments and the stress amplitudes distribution functions are calculated through the frequency domain method to overcome the computational burden. The stress reconstructions based on inverse fast Fourier transform are analyzed and the fatigue damage results show good consistency with the experimental ones.

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Section: Fatigue Stress Estimation and Damage Evaluationmentioning

confidence: 85%

Fatigue stress estimation of metro bogie frame through frequency response functions by using limited sensors

Sun

Lai

et al. 2023

Structural Health Monitoring

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show abstract

“…The S-N curve in power exponent form is shown in equation (8). The value of m in the S-N curve is 3.5 and a fatigue limit of 70 MPa is suggested (Wang et al, 2020). The equivalent stress for concerning points can be obtained from the stress-spectrum block by applying Miner’s law as follows:where σ−1,a,i and ni are the normal stress range and numbers of cycles of stress-spectrum block i .…”

Section: 5 Discussionmentioning

confidence: 99%

Influence of rail weld irregularity on dynamic stress of bogie frame based on vehicle-track rigid-flexible coupled model

Sun

Lai

Dai

et al. 2022

Journal of Vibration and Control

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To examine the effects of rail weld irregularity on the dynamic stress of the bogie frame, a numerical model which considers the bogie frame flexibility is established. Field measurements were conducted to validate the reliability of the proposed model and the bogie frame’s modal vibration including the bending deformation of cross beams at 50 Hz can be observed. A comparison between the flexible bogie frame model and the traditional multi-body dynamics model is conducted to investigate the influences of the bogie frame’s flexibility on wheel-rail interactions. Then the numerical model of the rail weld joint is proposed to study the P2 resonance performance and the dynamic stress patterns of the bogie frame. A comparison of influences with different rail weld irregularities and parameter studies are conducted. Then the effects of fastener stiffness on P2 resonance frequencies are discussed. The results show that it is necessary to consider the bogie frame’s flexibility in simulations which will aggravate the wheel-rail vibrations. The short wavelengths in combination with a certain speed could induce the bogie frame’s modal vibration and large track supporting stiffness will threaten the running safety of the vehicle which may also contribute to the formation of wheel out-of-roundness. Besides, the limit values of the rail weld irregularities are discussed to provide a reference for rail surface grinding from different aspects.

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“…The assumed damage index needs to be determined by experiments, which is complex and time‐consuming. Wang 32 predicted the reliable mileage of subway train bogie frames and ignored the randomness of the fatigue life of welded joints. To sum up, the reliability model based on fatigue damage needs further study.…”

Section: Introductionmentioning

confidence: 99%

Research on fatigue reliability prediction model and structural improvement of welded drive axle housing based on master S‐N Curve method

Tan

Wang

Xie

et al. 2022

Quality & Reliability Eng

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Fatigue reliability prediction of welded structures is mainly based on nominal stress or hot spot stress method, but there are some problems such as grid sensitivity and joint geometry dependence. The Master S-N curve method can solve these problems well, but the corresponding reliability model needs to be studied. In this paper, the fatigue reliability model of welded structures based on the Master S-N curve method is studied. Considering the randomness of life and the correlation of failure, a reliability model is proposed, which reduces the computational burden by establishing a median damage-random threshold rule. Taking the welded drive axle housing as an object, the system reliability is analyzed under the bench test condition, and verified by the experimental data. After the verification, this method is used to predict the reliability of the axle housing under variable amplitude loading collected in the test field, and the results are verified by Monte Carlo (MC) method. When the P-S-N curves are parallel, the model is accurate, which is the characteristic of the Master S-N curve method. This method only needs to input the median damage value of the weak part, which is easy to be applied. This method can speed up the reliability prediction cycle of welded structures, which is beneficial to product innovation and optimal design. Finally, an improved design scheme is proposed for the weak parts of welding, and the effects of welding leg width, welding depth, and closed weld on fatigue life are revealed.

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Fatigue damage and reliability assessment of subway train bogie frames under operating conditions

Cited by 9 publications

References 17 publications

Fatigue stress estimation of metro bogie frame through frequency response functions by using limited sensors

Fatigue stress estimation of metro bogie frame through frequency response functions by using limited sensors

Influence of rail weld irregularity on dynamic stress of bogie frame based on vehicle-track rigid-flexible coupled model

Research on fatigue reliability prediction model and structural improvement of welded drive axle housing based on master S‐N Curve method

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