Design and parameters influence analysis of dynamic vibration absorber for fastener clips in high-speed railway

Abstract

The fracture phenomenon of fastener clips occurs frequently in the sections with serious rail corrugation of high-speed railway, which brings huge potential safety hazards to track service and driving safety. In order to prevent the vibration fatigue fracture of fastener clips in high-speed railway, a dynamic vibration absorber (DVA) for clips is proposed in this paper to suppress the primary sensitive frequency of the corresponding resonant of clips. Firstly, based on the optimal design theory of DVA, a parameters design method of ring-shaped DVA suitable for clips is proposed. Secondly, the vibration characteristics of the high-speed railway fastener system are investigated, and the main reason for the fastener clips fracture is analyzed by simulation analysis combined with filed test. Then, focusing on the primary resonant frequency of clips, the vibration reduction effect of the ring-shaped DVA is analyzed. The results show that the ring-shaped DVA can change the natural frequency of the clip system, reduce the vibration response in the range of the original resonant frequency, and avoid the resonance phenomenon. Finally, the influences of mass ratio, frequency ratio, and damping ratio on the vibration reduction effect are analyzed, and the effectiveness of the parameters design method of ring-shaped DVA proposed in this paper is further proved. The research results can provide methodological support for the anti-breakage design of high-speed railway fastener clips.

Research on the Influence of Rub-impact Buffer Stroke on the Dynamic Response of Two-section Rotor

“…2. If the buffer stroke is 0.5 mm, the stability threshold of the parameters of the auxiliary subcritical device is narrow, and its radial stiffness must be within 3×10 4 N/m so the auxiliary rotor can safely and quickly pass the critical speed.…”

“…Wang designed dynamic vibration absorbers for double-span rotors and three-span rotors and studied the vibration control law of Zhou when he passed the critical speed [3]. Zhang designed a kind of annular dynamic vibration absorber, which can reduce the vibration of the rotor's over-critical vibration, and analyzed the influence of the installation position and quantity on the vibration reduction effect [4]. Zeng carried out a MATLAB simulation on the dry friction dynamic vibration absorber to obtain the response curves under different system parameters and optimized the vibration absorber based on the acceleration dynamic amplification coefficient [5].…”