- مبلغ: ۸۶,۰۰۰ تومان
- مبلغ: ۹۱,۰۰۰ تومان
The interaction between the catenary and pantograph is one of the most crucial factors that determine the train operation in high-speed railway. The bad state of catenary is able to directly influence the power supply safety of traction power system. In this paper, four aspects on the catenary research of high-speed railway are reviewed in detail, namely the solution methods for catenary equilibrium state, the dynamic modeling methods of catenary, non-contact detection methods of catenary, and the static and dynamic evaluation methods of catenary. In addition, their recent advances are described. For the low solution accuracy of the initial equilibrium state of catenary, the structure finding method with multi-objective constraint and nonlinear finite element procedure are introduced to solve the problem. For the catenary’s dynamic modeling, considering the influence of environmental wind on the catenary, environmental wind simulations and wind tunnel tests are used to obtain the aerodynamic coefficients and build the wind field along the catenary for analysis of its wind vibration characteristics. In order to improve the detection accuracy of non-contact detection for the catenary, the deep learning theory and real-time detection algorithms should be adopted in the future. In view of the lack of dynamic assessment method for the catenary, the modern spectrum evaluation, time– frequency analysis, big data technology and their combinations will be the important means for future catenary evaluation.
6.3 Prospects on study of technical standard
The technical standards on high-speed pantograph–catenary current collection quality and service performance are necessary to be improved. Standards for current practice adopt the statistical minimal value to evaluate the contact loss, which, however, is very simple and cannot consider the complex circumstances. Hence in the future, various dimensions of data should be analyzed according to the characteristics of catenary. A improved standard should be proposed to evaluate the current collection quality and service performance, which should include the following three aspects:
1. Wave propagation along catenary: The highest wave propagation speed is a critical index to determine the highest driving speed of a train. Because the maximum wave propagation speed is very close to the driving speed of trains, improving the utilization rate of wave speed for existing railways is imperative. Therefore, the wave propagation should be studied considering the effect of different components and different working conditions. The reflection and transmission coefficients in the dropper/registration points should be standardized for the optimization of the existing railway catenary.
2. The prediction of the fatigue and wear of contact wire: The previous studies mainly predict the fatigue of contact wire to evaluate the service performance of catenary, but the prediction accuracy of fatigue has not been verified. Therefore, the spectrum of catenary load should be studied in detail; the predictions of fatigue and wear should be standardized according to the real characteristics of catenary.
3. Standard of evaluating current collection quality: Referring to EN 50318, higher speed level and more complex circumstances should be considered for new evaluation standard of the current collection quality. Time–frequency analysis method should be adopted to reveal the factors influencing the separation between the pantograph and the catenary. The new standard should be proposed from multiple perspectives.