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<p>When gasbag inflation is used to drive a granular bed in a confined space, the system exhibits strong nonlinearity arising from membrane deformation, particle contact, and boundary constraint. This study investigates the dynamic response and energy-transfer characteristics of a gasbag-driven confined granular bed through experiments and DEM-FEM simulations. The dispersal patterns and particle velocity distributions were recorded under different driving pressures, and a parametric numerical model was used to examine the effects of driving pressure and particle diameter. The results show that, within the tested pressure range of 0.2–3.0&#xa0;MPa, the characteristic particle velocity follows an approximately pressure-dependent increasing trend, indicating effective conversion of pressure loading into particle kinetic energy. However, as the particle diameter increases, the particle velocity decreases nonlinearly after a critical size range despite the reduction in total particle mass. This behavior is associated with enhanced particle–particle contacts, stronger particle–wall interaction, and possible Janssen-type stress redistribution in the confined bed. Therefore, the dominant response may shift from inertia-dominated dispersion to contact-constrained motion with increased wall friction.</p>

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Energy transfer and dynamic response of a gasbag-driven confined granular bed

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月2日

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  • Jinwei Wang,
  • Jingjing Hou,
  • Chunlei Jiang,
  • Ruyi Tao,
  • Hao Wang,
  • Shaona Liu

摘要

When gasbag inflation is used to drive a granular bed in a confined space, the system exhibits strong nonlinearity arising from membrane deformation, particle contact, and boundary constraint. This study investigates the dynamic response and energy-transfer characteristics of a gasbag-driven confined granular bed through experiments and DEM-FEM simulations. The dispersal patterns and particle velocity distributions were recorded under different driving pressures, and a parametric numerical model was used to examine the effects of driving pressure and particle diameter. The results show that, within the tested pressure range of 0.2–3.0 MPa, the characteristic particle velocity follows an approximately pressure-dependent increasing trend, indicating effective conversion of pressure loading into particle kinetic energy. However, as the particle diameter increases, the particle velocity decreases nonlinearly after a critical size range despite the reduction in total particle mass. This behavior is associated with enhanced particle–particle contacts, stronger particle–wall interaction, and possible Janssen-type stress redistribution in the confined bed. Therefore, the dominant response may shift from inertia-dominated dispersion to contact-constrained motion with increased wall friction.