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<p>This study presents the design, experimental validation, and analysis of a compact vibro-impact capsule in millimeter scale, addressing challenges in miniaturization and nonlinear dynamics. The prototype, measuring 11&#xa0;mm in diameter and 22.23&#xa0;mm in length, integrates an actuator, control circuit, and battery, achieving significant size reduction. A mathematical model, experimentally validated, was nondimensionalized to extend applicability across diverse systems. Using bifurcation techniques, including direct integration and continuation methods, the effects of excitation frequency, duty cycle, and mass ratio on progression direction, period-doubling, and grazing states were analyzed. The fastest progression was observed during period-1 motion, highlighting its relevance to efficient operation and providing a foundation for future optimization studies. This research offers promising directions for active capsule development, with applications in biomedical fields such as non-invasive diagnostics and autonomous navigation. Insights into bifurcation dynamics contribute to micro-robotics, energy-efficient actuators, and advanced locomotion systems, paving the way for further studies in intestinal simulations and complex environments.</p>

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A vibro-impact capsule in millimeter scale: size reduction and nonlinear dynamics

  • 期刊论文

  • 发表日期：

    2025年7月12日

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  • Ngoc-Tuan La,
  • Duc-An Luong,
  • Huy-Tai Nguyen,
  • Ky-Thanh Ho,
  • Quoc-Huy Ngo,
  • Ngoc-Hung Chu,
  • Khac-Tuan Nguyen,
  • Van-Du Nguyen

摘要

This study presents the design, experimental validation, and analysis of a compact vibro-impact capsule in millimeter scale, addressing challenges in miniaturization and nonlinear dynamics. The prototype, measuring 11 mm in diameter and 22.23 mm in length, integrates an actuator, control circuit, and battery, achieving significant size reduction. A mathematical model, experimentally validated, was nondimensionalized to extend applicability across diverse systems. Using bifurcation techniques, including direct integration and continuation methods, the effects of excitation frequency, duty cycle, and mass ratio on progression direction, period-doubling, and grazing states were analyzed. The fastest progression was observed during period-1 motion, highlighting its relevance to efficient operation and providing a foundation for future optimization studies. This research offers promising directions for active capsule development, with applications in biomedical fields such as non-invasive diagnostics and autonomous navigation. Insights into bifurcation dynamics contribute to micro-robotics, energy-efficient actuators, and advanced locomotion systems, paving the way for further studies in intestinal simulations and complex environments.