Citation: | ZHOU Ning, WANG Jundong, LIU Yueping, YANG Xuan, LI Yan, WU Zaixin, ZHANG Weihua. Image Processing Based Method for Measuring Contact Force in Pantograph-Catenary System[J]. Journal of Southwest Jiaotong University, 2023, 58(1): 1-8, 57. doi: 10.3969/j.issn.0258-2724.20210509 |
Catenary and pantograph are important parts in the power supply system for electrified railways. The dynamic contact between the pantograph and the catenary is pivotal to ensure that the electric locomotives acquire good electricity. Therefore, good dynamic contact between the pantograph and the catenary is a key in the design of the railway power supply system. Given that the contact detection method is common for pantograph catenary contact force at present, and there are few research methods for non-contact detection, a new method based on the image processing algorithm is proposed for detecting pantograph catenary contact force. First, the structure of the pantograph head is simplified, the relationship between the pantograph dynamic contact force and the pantograph head displacement is analyzed, and a new model for calculating the contact force is developed. Next, the ground validation test is conducted on the pantograph-catenary hybrid simulation platform. In tests, the image processing module is used for target tracking and feature extraction of marked points in the collected image. Then, the displacement information is further analyzed by the data processing module to obtain the pantograph head acceleration and other information, and the acceleration signal is corrected. Finally, the contact force results corrected by inertia force and damping force are analyzed. The test results show that the maximum error of the pantograph head displacement detected by image processing is 1.3 mm, showing a high accuracy. Meanwhile, the maximum relative errors of the maximum, average and standard deviation of the dynamic pantograph-catenary contact force are only 5.46%, 5.15% and 4.58%, demonstrating that the measurement error is small. Thus, this method is feasible in detecting the pantograph-catenary contact force and its detection accuracy meets the requirements.
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