Analysis of Vibration Reduction Properties of Rail Damping under High-Speed Vehicle Moving Load

Abstract

Rail damping is an active and effective control method for mitigating railway vibration and noise at the source. In order to investigate the applicability of rail damping to high-speed railway, a vehicle-ballastless slab track-bridge coupling dynamic model was established and the vibration reduction effect of rail damping at bridge mid-span, bridge pier and beam gap under a high-speed vehicle moving load was analyzed. The results show that: the max vibration acceleration of ballastless track and bridge with rail damping are obviously decreased, and the duration time of structure vibration is also shortened. The vibration reduction effect of rail damping at bridge mid-span is more significant than that at bridge pier. In the working frequency range of rail damping, the acceleration vibration level of the rail can be reduced by 2–5dB, and the vibration of ballastless track slab and bridge also can be decreased in middle and high frequency range.

Vibration Isolation Performance of a Constrained Damping Base for a High-Pressure Plunger Pump

“…The parameters corresponding to a more performant vibration isolation base are also determined based on their level of influence. Please refer to the relevant literature for further detail on the parameter selection [28]. The material used in the damping layer of the constrained damping base proposed in this paper is consistent with the literature [29], and its relevant parameters are shown in Table 3.…”

“…When damping a plunger pump with a constrained damping base, if the excita frequency of the plunger pump is 𝜔 , the shear strain 𝛾 and the shear stress 𝜏 in damping layer can be expressed as [28,29]…”

“…This energy dissipation pred inantly arises due to internal molecular friction and microstructural changes within material. The size and shape of the hysteresis loop directly influence the magnitude rate of this energy dissipation, thereby impacting the material's vibration dam When damping a plunger pump with a constrained damping base, if the excitation frequency of the plunger pump is ω, the shear strain γ and the shear stress τ in the damping layer can be expressed as [28,29] γ = γ 0 sinωt (12)…”