Comparative analysis of rail pad lateral dynamic performance in metro systems

Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail and Rapid Transit, Год журнала: 2025, Номер unknown

Опубликована: Март 11, 2025

The lateral stiffness and damping of rail pads significantly influence train performance on curves, yet their effects are not well understood. This study investigates the dynamics three pad structures: groove (GRP), mesh-type (MTRP), with high (MTHDRP), impact curve performance. Results from loading tests indicate that MTHDRP exhibit highest static stiffness, dynamic ratio, while GRP have lowest, highlighting significant disparities. Finite element analysis reveals substantial deformations in under loads, leading to increased stress levels. Strategies increase across these types involve structural parameter adjustment integration harder materials, detailed further conclusions. Multibody simulations suggest decreasing increasing only increases safety curves but also reduces track system vibration. Under varying conditions speed, radius, slope, superelevation, consistently demonstrates favorable performance, underscoring importance design, manufacturing, testing, optimize vehicle curves.

Язык: Английский

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Vibration and noise reduction of axial piston pump based on negative capacitance piezoelectric phononic crystal structure

Physics of Fluids, Год журнала: 2025, Номер 37(4)

Опубликована: Апрель 1, 2025

Currently, the primary methods for reducing noise of piston pumps are to optimize shell structure pump and increase damping. However, with a change in frequency pump, these cannot control reduction real-time, leading development existing engineering applications. In this study, vibration method piezoelectric phononic crystals (PPCs) plate laid on is proposed. First, dynamic model crystal (PPC) was established, new PPCs designed. The effects circuit parameters bandgap transmission spectrum characteristics were analyzed using finite element method. It determined that series negative capacitance shunting can adjust low-frequency broadband gap attenuation plate. Subsequently, mechanical liquid coupling axial its accuracy verified experimentally. laying not plates compared. results showed has obvious range 50–1000 Hz. comparing average total sound pressure level external field radiation two, amplitude reduced by 4.76 dB (A), main frequencies significantly reduced.

Язык: Английский

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Robust Design Optimization of Chiral Rainbow Metamaterials Under Additive Manufacturing Defects

Опубликована: Янв. 1, 2025

Язык: Английский

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Dissipation mechanism and spatial vibration behavior of floating slab track with particle damping phononic crystal isolator under falling wheel impacts

Journal of Vibration and Control, Год журнала: 2025, Номер unknown

Опубликована: Апрель 27, 2025

The urban high-speed rail transit system generates excessive environmental vibrations, causing discomfort and damage to contact elements. This study introduces a novel non-obstructive particle damping phononic crystal vibration isolator (NOPD-PCVI) for floating slab track system. A full-scale falling wheel impact test compared the reduction performance of NOPD-PCVI that traditional steel spring (SSVI), with accelerometers strain gauges capturing responses. Numerical simulations experiments revealed was most effective within 50–160 Hz bandgap, reducing vertical base acceleration by 19.7 dB 10 mm drop height 22 20 height. Structural intensity analysis further confirmed NOPD-PCVI’s efficiency in limiting energy transfer. offers viable solution reduction, supporting sustainable development systems.

Язык: Английский

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One-way transmission of elastic waves in phononic beams

International Journal of Mechanical Sciences, Год журнала: 2025, Номер unknown, С. 110377 - 110377

Опубликована: Май 1, 2025

Язык: Английский

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Syndiotactic chiral metamaterial absorber for low-frequency broadband vibration reduction

International Journal of Mechanical Sciences, Год журнала: 2025, Номер unknown, С. 110435 - 110435

Опубликована: Май 1, 2025

Язык: Английский

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Efficient predictive model for high-frequency fatigue life of high-speed railway fastening clips using particle swarm optimization algorithm

Mechanical Systems and Signal Processing, Год журнала: 2025, Номер 235, С. 112884 - 112884

Опубликована: Май 28, 2025

Язык: Английский

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Design of quasi-zero-stiffness metamaterials with ultra-wideband vibration isolation performance

International Journal of Mechanical Sciences, Год журнала: 2025, Номер unknown, С. 110440 - 110440

Опубликована: Май 1, 2025

Язык: Английский

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A novel nested compression-torsion metamaterial with independently customized mechanical properties

Engineering Structures, Год журнала: 2024, Номер 322, С. 119246 - 119246

Опубликована: Окт. 31, 2024

Язык: Английский

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Floating slab track integrated with quasi-zero stiffness mechanism and dynamic vibration absorber for suppressing low-frequency vibration

Vehicle System Dynamics, Год журнала: 2024, Номер unknown, С. 1 - 25

Опубликована: Июль 25, 2024

Vibration amplification at the natural frequency of floating slab track (FST) remains a significant concern. This study integrates quasi-zero stiffness mechanisms combined with dynamic vibration absorbers (QZSDVA) into FST, resulting in novel formulation reduction (QZSDVA-based FST) to effectively suppress low-frequency vibrations. The analytical expression for response two-degree-of-freedom QZSDVA system is derived and subsequently validated through numerical approaches. Building on this, vehicle-QZSDVA-based FST model established optimal parameters DVA are identified guided by H∞ optimisation. Further exploration highlights capability QZSDVA-based significantly suppressing vibrations reducing support force structure, without compromising running safety subway train. Results emphasise that optimally tuned enable reduce effectively, even minimal mass. In comparison alternative tracks, proposed outperforms within range 6.3–16 Hz. research offers an innovative solution mitigate environmental induced urban rail transit.

Язык: Английский

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