Abstract:

To ensure the effective contact between the contact line and the pantograph in electrified railways and thereby guarantee the safety and stability of train operation, the ideas and methods for conducting a systematic study on the frictional contact characteristics of the contact line and the pantograph under current-carrying conditions were proposed. Firstly, based on the sliding electrical contact test platform, experiments on the sliding electrical contact friction force between the pantograph and the contact line were conducted under different working conditions (covering pressure fluctuation amplitude, pressure fluctuation frequency, contact current, and sliding speed). Then, based on the experimental data, single-factor mathematical models that could respectively represent the influence of pressure fluctuation amplitude, contact current, and sliding speed were selected. The model construction method adopted curve estimation, and it had a relatively high fitting accuracy. Finally, through multiple regression analysis, a prediction model for contract line-pantograph friction force that comprehensively considered the combined effect of pressure fluctuation loads and contact current was established. The reliability and applicability of the model were verified through comparative test data. The test results show that the sliding friction force between the pantograph and the contact line decreases as the contact current increases, while the increase in pressure fluctuation amplitude and sliding speed will lead to an increase in friction force. In contrast, the influence of pressure fluctuation frequency on the contract line-pantograph friction force is relatively weak.

Key words: pressure fluctuation, contact current, curve estimation, multiple regression, contract line-pantograph friction force