Abstract
The dry friction structure is a commonly used vibration-damping method for railway vehicles. Insufficient vibration damping performance will cause excessive vibration of the vehicle, which is not conducive to the safety of the vehicle. However, the mechanism of vibration damping and the cause of clamping stagnation have not been well resolved. This paper uses the analytical method, numerical method, and finite element method to analyze the vertical dynamic characteristics of the simple suspension system with dry friction and demonstrates that the numerical method is an effective method to study the dry model. The conditions for the system to produce sticking events were analyzed by the numerical method. The analysis shows that the system's excitation is too small, which causes clamping stagnation to the system. The reduction of the wedge angle and the friction coefficient are conducive to eliminating sticking. A negative side frame angle is conducive to reducing the high-frequency energy of the excitation. Decreasing spring stiffness or increasing system mass to reduce system frequency can reduce sticking events. The mutual verification of different methods confirms the correctness of the analysis method and analyzes the cause of sticking or clamping stagnation from the mechanism, which provides a new idea for the design and improvement of the dry friction damping system of railway vehicle bogies.
Highlights
Academic Editor: Marcos Silveira e dry friction structure is a commonly used vibration-damping method for railway vehicles
The mechanism of vibration damping and the cause of clamping stagnation have not been well resolved. is paper uses the analytical method, numerical method, and finite element method to analyze the vertical dynamic characteristics of the simple suspension system with dry friction and demonstrates that the numerical method is an effective method to study the dry model. e conditions for the system to produce sticking events were analyzed by the numerical method. e analysis shows that the system’s excitation is too small, which causes clamping stagnation to the system. e reduction of the wedge angle and the friction coefficient are conducive to eliminating sticking
Decreasing spring stiffness or increasing system mass to reduce system frequency can reduce sticking events. e mutual verification of different methods confirms the correctness of the analysis method and analyzes the cause of sticking or clamping stagnation from the mechanism, which provides a new idea for the design and improvement of the dry friction damping system of railway vehicle bogies
Summary
Received 2 September 2020; Revised October 2020; Accepted 9 January 2021; Published January 2021. E dry friction structure is a commonly used vibration-damping method for railway vehicles. E mutual verification of different methods confirms the correctness of the analysis method and analyzes the cause of sticking or clamping stagnation from the mechanism, which provides a new idea for the design and improvement of the dry friction damping system of railway vehicle bogies. E vibration energy from track disturbances translates to wagons via the wheelsets, side frames, and the bolster. It dissipates primarily through dry friction damper. E friction wedges in three-piece bogies play a controlling role in the vertical and lateral dynamics, as well as the lateral stability of wagons. E characteristic of dry friction plays a significant role in the dynamic system. e modeling of the friction force in the system depends on several environmental factors including sliding speed, temperature, and normal load [3]. e magnitude of the friction force decreases when the relative velocity |x_| of the contact surface of two solids increases if |x_|
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