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Research on the Dynamic Characteristics of Pantographs Based on Cartesian Coordinates

Author(s)

Jie Yu1, Qingjun Li2, Jinfa Guan3,*, Junqing Chen3, Shuai Jiang4

Affiliation(s)

1Yangtze River Coastal Railway Group Sichuan Co., Ltd., Chengdu, Sichuan, China 2China Railway First Survey and Design Institute Group Co., Ltd., Xi’an, Shaanxi, China 3Southwest Jiaotong University, Chengdu, Sichuan, China 4Safety Technology Center, National Railway Administration, Beijing, China *Corresponding Author

Abstract

This paper establishes a kinematic model of the pantograph based on Cartesian coordinates. On this basis, the dynamic model of the pantograph is derived using the first-kind Lagrange equations. Combined with the derived constraint equations, the dynamic characteristic equations of the pantograph are solved by numerical analysis. The derived kinematic and dynamic characteristic equations are applied to the structural analysis and optimization of pantographs for trunk railways and urban rail transit, providing theoretical support for pantograph design. Taking a typical metro pantograph as an example, the dynamic characteristic equations are solved, yielding the following conclusions: the motion trajectory of the panhead follows an "S" shape distribution; formulas for the lifting force, panhead displacement, and static contact force are obtained; significant vibration occurs between the panhead and the upper frame during the lifting and lowering process; and the natural frequency of the pantograph is 7.6 Hz.

Keywords

Pantograph; Kinematics; Dynamics; Cartesian Coordinates

References

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