Determining damping characteristics of railway-overhead-wire system for finite-element analysis

Zou, Dong; Zhang, Wei Hua; Li, Rui Ping; Zhou, Ning; Mei, Guiming

doi:10.1080/00423114.2016.1172715

Cited by 27 publications

(14 citation statements)

References 19 publications

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“…The previous research on OCL damping [41] indicates that the OCL is a lightly damped system and its damping ratio is normally within 0.0005-0.002. The damping ratio is set as 0.001 in this analysis to investigate the buffeting behaviour.…”

Section: B Buffeting Analysismentioning

confidence: 99%

A Response Spectrum Analysis of Wind Deflection in Railway Overhead Contact Lines Using Pseudo-Excitation Method

Song

Zhang

Wang

2021

IEEE Trans. Veh. Technol.

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The wind deflection of overhead contact lines (OCLs) challenges the stable and safe operation of electrified railways. The steady wind causes the static deflection of the contact line, while the fluctuating wind leads to the OCL buffeting. This paper performs a response spectrum analysis of the wind deflection caused by the combined effects of steady and fluctuating winds. Considering the initial configuration of OCL, an absolute nodal coordinate formulation method is employed to model the OCL. A spatial wind field including the fluctuating wind in three directions is constructed and the aerodynamic forces on the OCL are derived. A nonlinear solution procedure is proposed to include the geometrical nonlinearity and dropper slackness in the evaluation of static wind deflection. The pseudo-excitation method is utilised to evaluate the buffeting response of the OCL with stochastic wind load. The analysis results indicate that the dropper slackness has a significant effect on the vertical static deflection. Under an extreme wind speed of 40 m/s, the contact line is always within the safe working range of pantograph head when only the steady wind load is considered. However, the stochastic wind load causes non-negligible fluctuation of OCL, and the contact line may be outside of the pantograph working range under the same wind speed. Sensitivity analyses on the effects of some key parameters to the OCL buffeting suggest that the increases of damping ratio and the tension class are effective measures to improve the wind-resistance capability of OCL.

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Section: B Buffeting Analysismentioning

confidence: 99%

A Response Spectrum Analysis of Wind Deflection in Railway Overhead Contact Lines Using Pseudo-Excitation Method

Song

Zhang

Wang

2021

IEEE Trans. Veh. Technol.

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“…Apart from the measure to adjust the pantographs interval, the inclusion of damping components is another normal measure to reduce the negative influence of the mechanical wave on the trailing pantograph. Previous researches only discuss the structural damping of the catenary system [13], [14]. In this section, the damper is added to the steady arm (as shown in Fig.…”

Section: B Verification With Reference Model In Benchmarkmentioning

confidence: 99%

“…The importance of damping to improve to structural performance has been widely acknowledged [12]. The damping properties are identified by covariance-driven stochastic subspace identification (Cov-SSI) method [13] and the noncontact measurement technique [14]. Normally the pantograph-catenary interaction is affected by the disturbance from both of the external environment and the system itself.…”

Section: Introductionmentioning

confidence: 99%

Effective Measures to Improve Current Collection Quality for Double Pantographs and Catenary Based on Wave Propagation Analysis

Zhao

Song

Liu

2020

IEEE Trans. Veh. Technol.

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The pantograph installed on the train roof is responsible for collecting the electrical energy via the sliding contact with the catenary constructed along the railroad. To enhance the carrying capacity of the high-speed train, multiple pantographs are normally mounted on the EMU (Electrical Multiple Unit train) to interact simultaneously with the catenary. Especially in China, the double pantographs-catenary interaction is gradually becoming the mainstream in the newly built highspeed network. The biggest challenge of double-pantograph operation is the deterioration of the current collection quality of the trailing pantograph. The mechanical wave excited by the leading pantograph propagates along the contact wire and disturbs the trailing pantograph. This paper attempts to propose effective measures to improve the current collection quality of the trailing pantograph. To improve the understanding of the wave propagation in the contact wire excited by two pantographs, the double pantographs-catenary model is established using a FEM (Finite Element Method) approach. Through the analysis of the contact wire uplift response excited by a single moving force, the optimal interval of double pantographs is discussed. The results indicate that the bad interval appears at the velocity peak of the contact wire uplift, whereas, the good interval appears at the valley value of the contact wire uplift velocity. Based on this idea, the formula of optimal interval of double pantographs is proposed, and its validity is verified using the parameters of the European and China high-speed networks. Then the damper is introduced to the steady arm to reduce the wave intensity. The simulation results show that the slight steady arm damping has a positive effect on the performance of the double pantographs-catenary interaction.

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“…The image-based technique has also been adopted in catenary vibration measurement in the literature. Zou et al [ 29 ] proposed a set of photogrammetric devices in their work to obtain the displacement histories of a catenary wire in the laboratory. The non-contact inspection approach has been proven to be effective in catenary vibration identification.…”

Section: Introductionmentioning

confidence: 99%

A Siamese Network-Based Non-Contact Measurement Method for Railway Catenary Uplift Trained in a Free Vibration Test

Duan

Liu

Zhai

et al. 2020

Sensors

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The vibration of the catenary that is initiated by the passing pantograph has a direct influence on the pantograph–catenary contact performance. Monitoring the dynamic uplift of the catenary can help inspectors to evaluate the railway operation conditions and investigate the mechanism of pantograph–catenary interaction further. In this paper, a non-contact measurement method based on the deep leaning method is proposed to monitor the real-time vibration of the catenary. The field test for the catenary free vibration is designed to validate the method’s performance. The measurement method is developed based on the fully convolutional Siamese neural network, and the contact wire is taken as the tracking target. To reduce the recognition errors caused by the changes in the shape and grayscale of the moving contact wire in images, the class-agnostic binary segmentation mask is adopted. A developed down-sampling block is used in the neural network to reduce the image feature loss, which effectively enhances the recognition effect for the catenary vibration under variable lighting conditions. To validate the performance of the proposed measurement method, a series of field tests of catenary free vibration were conducted under various lighting conditions and different excitations, and the recognition results were compared with traditional target tracking methods. The results show that the proposed method performs well for catenary vibration identification in the field test. Additionally, the uplift data extracted from the identified images agree with the numerical results, and also help to further investigate the wave propagation and damping characteristics in the catenary structure.

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Determining damping characteristics of railway-overhead-wire system for finite-element analysis

Cited by 27 publications

References 19 publications

A Response Spectrum Analysis of Wind Deflection in Railway Overhead Contact Lines Using Pseudo-Excitation Method

A Response Spectrum Analysis of Wind Deflection in Railway Overhead Contact Lines Using Pseudo-Excitation Method

Effective Measures to Improve Current Collection Quality for Double Pantographs and Catenary Based on Wave Propagation Analysis

A Siamese Network-Based Non-Contact Measurement Method for Railway Catenary Uplift Trained in a Free Vibration Test

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