Influence of Lateral Differential Settlement of Subgrade on Dynamic Performance of High-Speed Vehicle System
Publication: Journal of Engineering Mechanics
Volume 148, Issue 3
Abstract
To illustrate the influence of differential settlement along the lateral direction of subgrade on the dynamic performance of a high-speed vehicle system, based on the vehicle–track coupling dynamic theory and finite-element method, a vehicle–track–subgrade spatial coupling dynamic model considering the lateral mechanical characteristics of the vehicle system is established, and the dynamic performance of the vehicle system under different lateral differential settlement parameters (amplitude/wavelength) of subgrade on one side and both sides and the vehicle speeds are studied. The study reveals the following. The vehicle dynamic response under the lateral differential settlement of subgrade on both sides is generally greater than that under the lateral differential settlement of subgrade on one side, and the difference becomes more obvious with increases in the lateral differential settlement amplitude. However, there is little difference between the two lateral differential settlement modes on the car body lateral acceleration. The wheel/rail vertical force of the left rail (with large settlement amplitude) is greater than that of the right rail (with small settlement amplitude), while the wheel/rail lateral force of the right rail is greater than that of the left rail. The dynamic response of the vehicle system increases with increases in the lateral differential settlement amplitude; the dynamic response of the vehicle system increases noticeably when the amplitude of lateral differential settlement exceeds 25 mm. The lateral differential settlement wavelength is inversely proportional to the dynamic response of the vehicle system, and the wavelength range has the greatest impact on the dynamics of the vehicle system. The vehicle driving speed is directly proportional to the vehicle system dynamic response, and the vehicle system dynamic response increases significantly when the driving speed exceeds .
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work described in this paper was supported by the National Natural Science Foundation of China (Grant No. 5171101316).
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Published In
Journal of Engineering Mechanics
Volume 148 • Issue 3 • March 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Apr 16, 2021
Accepted: Oct 8, 2021
Published online: Jan 11, 2022
Published in print: Mar 1, 2022
Discussion open until: Jun 11, 2022
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