Analysis of the service life of railway hydraulic dampers considering temperature and loading

Abstract

Hydraulic dampers are mainly used to maintain high-speed trains in a stable state when running at high speed. In this paper, an equivalent method for the lifetime of dampers is proposed to establish the relationship between the long-term loading test and the mileage in service condition. The performance degradation of the damper at different temperatures is calculated using the long-term loading test carried out under the corresponding temperature conditions. Arrhenius model is applied to convert the degradation under different temperatures, and the sensitive parameter is selected for the conversion of the damper’s performance degradation under different temperatures. An energy method is proposed to solve the problem of the damper lifetime under different loads, so as to achieve the equivalent of the damper between the long-term load test and the mileage in service condition. Finally, taking the anti-yaw damper of a certain type of high-speed train in China as the research object, the lifetime equivalent method proposed in this paper is applied and the result showed that the anti-yaw damper had remaining service life after 2.4 million kilometers of service.

Theory and practice for assessing structural integrity and dynamical integrity of high-speed trains

“…Subsequently, the remaining useful life of the tested dampers under equivalent operational conditions can be obtained. Some key methods are briefly outlined below, while more details can be found in Zeng, Song, Zhang, Hu, and Chang (2021) and Hu, Song, Zeng, and Zhang (2021).Nonlinear damping model in vehicle dynamics simulations: Dampers, especially yaw dampers, can exhibit significantly nonlinear damping characteristics. It is important to include such nonlinearity in the vehicle dynamics model, such as using piecewise linear damping (Zeng, Song, Zhang, Hu et al.…”

“…Equivalence between experimental loads and operational loads: Vehicle dynamics simulation is used for not only determining the loading conditions for the laboratory tests but also estimating the equivalent remaining useful life from the experimental loads. A novel method is proposed to build up such equivalence that takes into account both the dynamic loads in terms of total energy and the temperature effect in terms of a scaling coefficient (Hu et al. , 2021).…”

“…(2) Degradation model of damping characteristics: Modeling the degradation of damping characteristics requires the extraction of sensitive features. Such features can be nonparametric, such as directly from damping characteristics measurements(Hu et al, 2021), parametric, such as from a damping model or probabilistic, such as from statistics(Zeng, Song, Zhang, Hu et al, 2021;Zeng, Song, Zhang, Zhou, Xie, & Qi, 2021;Zeng, Song, Zhang, Zhou, Xie, & Tang, 2021).…”

Equivalent method for assessment of bearings at operational types of loadings

“…[1][2][3][4][5][6][7] Addressing the dynamic coupling effect of the radial force, axial force components, and bending moment of the bearing, Zhao et al 8 proposed a prediction method for the service life of the hub bearing under multi-axis loading conditions. Hu et al 9 introduced an energy method to solve address shock absorber lifespan concerns under different types of loading, with test results correlating with actual service mileage. Lang et al 10 established a coupling analysis model for the thermal effect of sliding bearing and accurately determined the equivalent temperature of the bearing's flow field.…”

Dynamics Modeling and Simulation Analysis of a Gas-hydraulic Buffer Based on AMESim

“…A physical parameter model considering the damper structure, including the orifice, damping valve, rubber joint, and the relationship between the hydraulic oil temperature and viscosity was developed [35], and based on the established mathematical model, Wu et al analysed the influence of the accumulator volume, accumulator precharge pressure, hydraulic pipeline length and inner diameter on shock absorber characteristics [36]. Hu et al found that temperature and load have an impact on the life of the damper [37]. Wang et al established a mathematical model of the CRH 380 high-speed rail hydraulic damper to study the influence of rubber connection stiffness and fluid conditions on the dynamic characteristics of the damper, as well as the influence of the damper structural parameters on the vehicle system dynamics.…”