Chapter 7 Study on Dynamic Stiffness Characteristic of Primary Suspension for High-Speed EMU Xiugang Wang, Xiaoning Cao, Ai qin Tian, Jian Su, Wei Xue, and Shen Zhan Abstract This paper made a deep research on the axle-box suspension dynamic stiffness characteristics. And testing models including vertical, transversal and longitudinal and solving method based on stepping swept sine excitation were put forward. Then, experiment was taken on a certain bogie, and curves of frequency-stiffness were obtained based on the evaluation method for the dynamic parameters. The results of this paper play a positive role to parameter matching and dynamic simulation. Keywords Dynamic · Stiffness · Primary suspension · High-speed EMU 7.1 Instruction Railway vehicle is a complexity dynamic system with multidimensional and multi-DOF. As the unique running gear of vehicle, dynamic performance of the bogie is the key to the running safety and stability. Suspension system including axlebox suspension and secondary suspension is of the main components, which is closely related to passing ability and passenger comfort. This paper made a deep research on the axle-box suspension dynamic stiffness characteristics; analysis model of axle-box suspension was also established. Meanwhile, testing models including vertical, transversal and longitudinal and solving method based on stepping swept sine excitation were put forward. Then, the experiment was taken on a certain bogie, and curves of frequency-stiffness were obtained based on the evaluation method for the dynamic parameters. The results of this paper play a positive role to parameter matching and dynamic simulation. 7.2 Analysis Model of Axle-Box Suspension Combined with structure and bearing performance of axle-box suspension, steel spring was simplified as a single degree of freedom model with the vertical stiffness, which ignored the damping characteristics of flexible rubber sheet. Vertical damper was simplified as the ideal linear viscoelasticity model. Considering the viscoelastic characteristics of Guide arm node, the spring-damped parallel model was established. Meanwhile, as Guide arm node endured the 6-dof spatial loading and torque from wheel and framework, it was simplified to a 8-dof spring–damper model. Figure 7.1 was the physical of axle-box suspension, and analysis model was shown as Fig. 7.2. During the analysis model, it could be set as follows. Ow −xwywzw was Coordinate system of axle box, Ot −xtytzt, Ot1 −xt1yt1zt1, Ot2 −xt2yt2zt2 were Coordinate system of Guide arm node. Vertical stiffness and damping coefficient was described as Kzp, Czp; Stiffness and damping coefficient of vertical, lateral and longitudinal for the Guide arm node were described as Ktzj, Ctzj, Ktyj, Ctyj, Ktxj, Ctxj; Kθtj was rotation angle of Guide arm node. X.Wang ( ) · X. Cao · A. Tian · W. Xue · S. Zhan CRRC Qingdao Sifang Co., Ltd, Qingdao City, China e-mail: wangxiugang@cqsf.com J. Su College of Transportation, Jilin University, Changchun City, China © Society for Experimental Mechanics, Inc. 2020 A. Linderholt et al., Dynamic Substructures, Volume 4, Conference Proceedings of the Society for Experimental Mechanics Series, https://doi.org/10.1007/978-3-030-12184-6_7 67
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