Structural galloping suppression with high-frequency flutter

International Journal of Mechanical Sciences, Год журнала: 2025, Номер unknown, С. 109928 - 109928

Опубликована: Янв. 1, 2025

Язык: Английский

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Syndiotactic chiral metastructure with local resonance for low-frequency vibration isolation

International Journal of Mechanical Sciences, Год журнала: 2024, Номер 281, С. 109564 - 109564

Опубликована: Июль 20, 2024

Язык: Английский

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Vibro-acoustic suppression in metamaterial sandwich plate using compressional-torsional coupling resonator

International Journal of Mechanical Sciences, Год журнала: 2025, Номер 288, С. 110039 - 110039

Опубликована: Фев. 1, 2025

Язык: Английский

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“Borrow-force-attack-force” by multi-scale elastic metamaterial with nonlinear damping

Composites Part B Engineering, Год журнала: 2024, Номер unknown, С. 111884 - 111884

Опубликована: Окт. 1, 2024

Язык: Английский

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Structural Vibration Comfort: A Review of Recent Developments

Buildings, Год журнала: 2024, Номер 14(6), С. 1592 - 1592

Опубликована: Май 31, 2024

With continuous improvements in the social economy and living standards of individuals, vibration comfort building structures has gradually been emphasized by academic engineering communities, such as vehicle-induced vibrations buildings near traffic, human-induced large-span structures, wind-induced super-high-rise buildings, machinery-induced structural vibrations. Comfort-based analysis is distinct from traditional safety-based analysis, its theoretical systems unified guidelines have not yet established. This paper reviews recent research on comfort, including major load categories their impacts, comfort-based evaluation methods, vibration-mitigation measures. By presenting shortcomings existing research, potential topics for future study are suggested.

Язык: Английский

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Mechanisms of low-frequency bandgap formation and energy absorption of three-dimensional nested hybrid lattice structures

Composites Part B Engineering, Год журнала: 2024, Номер unknown, С. 112045 - 112045

Опубликована: Ноя. 1, 2024

Язык: Английский

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Dynamic analysis of water-rich heavy haul railway tunnels considering basement defects evolution and train effects

Railway Engineering Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 10, 2025

Abstract With the rapid development of heavy haul railway transportation technology, tunnel foundation defects and their effects on structural performance have attracted wide attention. This paper systematically investigates evolution mechanism in tunnels impact stiffness degradation through experiments numerical simulations. A train–ballasted track–tunnel basement–surround rock dynamic interaction model (TTTR model) is constructed. Firstly, study reveals four-stage process initial basement under complex environmental conditions. Experiments were conducted to measure load-bearing capacity structure different defect states. It found that defects, especially coupling loose fill with water-rich environment surrounding rock, significantly reduce bottom increase risk damage. Then, based refined simulation wheel–rail multi-scale coupled modeling TTTR was successfully constructed, its validity proven validation. time-varying technique constrained boundary substructures (CBS technique) adopted, improving computational efficiency while ensuring calculation accuracy. The also analyzes degrees void behavior train characteristics structure. finds a significant train’s operational state, track vibration displacement, stress lining structure, effect voids environment, which has greatest impact. research results this provide theoretical basis technical support for maintenance reinforcement structures.

Язык: Английский

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An improved chord measurement method for determining track irregularity thresholds on long-span high-speed railway bridges

Mechanical Systems and Signal Processing, Год журнала: 2025, Номер 229, С. 112510 - 112510

Опубликована: Фев. 27, 2025

Язык: Английский

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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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