强电流滑动电接触下最佳法向载荷

Optimal Normal Load of Sliding Electrical Contacts Under High Current

在弓网受流系统中,反映其性能的参数主要有磨耗率、载流效率和载流稳定性,均与受电弓滑板和接触网导线之间的法向载荷有着密切关系。适当的法向载荷能使磨耗率最小,亦能维持较高的载流效率及载流稳定性。论文通过对铜基粉末冶金滑板与铜锡导线的对磨实验,得到了滑板磨耗率、载流效率和载流稳定性随工况变化的规律。随后采用支持向量机(SVM)建立了以磨耗率、载流效率和载流稳定性作为因变量,以法向载荷、滑动速度和接触电流为自变量的回归模型,并通过差分进化-分布估计(DE-EDA)算法确定特定工况条件下的基于滑板磨耗率最低、载流效率和稳定性最高的最佳法向载荷及其对应的Pareto最优解。

In the pantograph current collection system, the major parameters, such as wear loss rate, current-carrying efficiency and stability, reflect the quality of the pantograph-catenary system. There is a close relationship between those parameters and the normal load between the pantograph slide and the contact wire. Appropriate normal load minimizes the wear rate and maintains high performance of current-carrying efficiency and stability. The variation law of wear loss, current-carrying efficiency and stability of current-carrying is obtained under various operating conditions through Cu-base powder metallurgy strip rubbing against the Cu-Sn wire. Then the support vector machine（SVM） is used to establish the regress model with the dependent variables of wear loss rate, current-carrying efficiency and stability, normal load, velocity and current as the independent variables. The optimal normal load and Pareto optimal solutions under the condition of the specific velocity and current are acquired through differential evolution-estimation of distribution algorithm（DE-EDA）.