Integrated Floating Slab Dynamic Vibration Absorber Based on Tuned Liquid Particle Damping: Theory, Modeling, and Experimentation

As subway train‐induced low‐frequency vibrations continue to rise, there is an increasing need for more effective vibration control strategies. Although current low‐frequency vibration reduction methods offer some solutions, further progress is necessary. This paper introduces a novel tuned liquid particle damper‐dynamic vibration absorber (TLPD‐DVA), which merges the principles of tuned liquid dampers (TLDs) and particle dampers (PDs). By capitalizing on the low‐frequency damping capabilities of TLDs, this approach incorporates particles suspended within the liquid to create a hybrid damping device capable of effectively attenuating vibrations across a wide low‐frequency range (10 to 80 Hz). A discrete element method‐computational fluid dynamics (DEM‐CFD) model for multiphase flow is employed to explore the damping mechanism, optimize system parameters, and develop a frequency‐dependent nonlinear damping device. The TLPD‐DVA is then applied to floating slab track systems to control low‐frequency vibrations, and a dynamic interaction model involving the coupled vehicle‐TLPD‐DVA‐floating slab track‐tunnel system is established to assess the system’s response. Harmonic response analysis of a floating slab track fitted with TLPD‐DVAs, along with dynamic mass and mass ratio indices, clarifies the vibration reduction mechanism. Additionally, field tests demonstrate that the TLPD‐DVA reduces vertical acceleration on the floating slab by up to 8 dB and on the tunnel wall by up to 10 dB within the low‐frequency range, surpassing the performance of tuned DVAs. The proposed TLPD‐DVA offers significant potential for vibration control in various civil engineering applications, including transportation infrastructure, building foundations, and vibration‐sensitive facilities.