A high-accuracy single-frame 3D reconstruction method with color speckle projection for pantograph sliders

Yang, Kai; Liu, Yunxuan; Li, Xinyu; Bai, Zijian; Wan, Yingying; Xiao, Yang; Li, Jinlong

doi:10.1016/j.measurement.2024.115192

Measurement

2024

DOI: 10.1016/j.measurement.2024.115192

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A high-accuracy single-frame 3D reconstruction method with color speckle projection for pantograph sliders

Kai Yang,

Yunxuan Liu,

Xinyu Li

et al.

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2024

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Cited by 2 publications

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Research on the Uplift Characteristics of Pantographs of High-Speed Trains Under Crosswind Conditions

Zhao,

Duan,

Lan

et al. 2024

Applied Sciences

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Through the geometric relationships and force analysis of the main components of pantographs on high-speed trains, the coefficients of aerodynamic forces and lift transmission between the pantograph and main components under crosswind conditions were derived. Based on the aerodynamic forces acting on the pantograph at different crosswind speeds, wind angles, and operating speeds, the aerodynamic lift of the pantograph and main components was ultimately determined. The results indicate that the aerodynamic lift of the pantograph is mainly distributed on the bow structure, with the aerodynamic lift of the upper frame all being negative values, while the absolute value of the aerodynamic lift of the lower arm rod is the smallest. The operating speed of the pantograph and the wind angle of the crosswind have a significant impact on the aerodynamic lift of the main components, while the impact of the crosswind speed is relatively small. At the same operating speed of the pantograph, the lower the corresponding crosswind speed, the smaller the aerodynamic lift of the pantograph. The aerodynamic lift of the pantograph tends to decrease gradually with the increase in crosswind speed, and the impact of crosswind speed decreases gradually with the increase in the pantograph operating speed. A comprehensive relationship formula between the aerodynamic lift of the pantograph and the operating speed, crosswind speed, and wind angle is obtained, and the empirical formula for the contact force of the bow net and train operating speed is modified. The research results are of great significance and value for the study and application of lift forces on pantographs under crosswind conditions.

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Research on the Uplift Characteristics of Pantographs of High-Speed Trains Under Crosswind Conditions

Zhao,

Duan,

Lan

et al. 2024

Applied Sciences

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A Registration Method Based on Ordered Point Clouds for Key Components of Trains

Yang,

Deng,

Bai

et al. 2024

Sensors

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Point cloud registration is pivotal across various applications, yet traditional methods rely on unordered point clouds, leading to significant challenges in terms of computational complexity and feature richness. These methods often use k-nearest neighbors (KNN) or neighborhood ball queries to access local neighborhood information, which is not only computationally intensive but also confines the analysis within the object’s boundary, making it difficult to determine if points are precisely on the boundary using local features alone. This indicates a lack of sufficient local feature richness. In this paper, we propose a novel registration strategy utilizing ordered point clouds, which are now obtainable through advanced depth cameras, 3D sensors, and structured light-based 3D reconstruction. Our approach eliminates the need for computationally expensive KNN queries by leveraging the inherent ordering of points, significantly reducing processing time; extracts local features by utilizing 2D coordinates, providing richer features compared to traditional methods, which are constrained by object boundaries; compares feature similarity between two point clouds without keypoint extraction, enhancing efficiency and accuracy; and integrates image feature-matching techniques, leveraging the coordinate correspondence between 2D images and 3D-ordered point clouds. Experiments on both synthetic and real-world datasets, including indoor and industrial environments, demonstrate that our algorithm achieves an optimal balance between registration accuracy and efficiency, with registration times consistently under one second.

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A high-accuracy single-frame 3D reconstruction method with color speckle projection for pantograph sliders

Cited by 2 publications

References 40 publications

Research on the Uplift Characteristics of Pantographs of High-Speed Trains Under Crosswind Conditions

Research on the Uplift Characteristics of Pantographs of High-Speed Trains Under Crosswind Conditions

A Registration Method Based on Ordered Point Clouds for Key Components of Trains

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