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<p>To address the issues of high energy consumption and component collisions caused by intense nonlinear vibrations during the drilling process of hydraulic rock drills, this paper proposes a modeling and optimization method based on wake oscillator theory. By establishing a fluid–structure interaction drilling dynamics model that incorporates axial and longitudinal vibration impacts, combined with rock contact theory, the study systematically reveals the influence patterns of impact frequency and pressure on the system’s dynamic characteristics and energy utilization efficiency. As the impact frequency increases, the system undergoes period-doubling bifurcation and saddle-node bifurcation, accompanied by a decline in energy utilization efficiency. Within the chaotic regime induced by bifurcation, energy utilization shows a slight recovery; however, the increased longitudinal amplitude tends to exceed the design clearance, leading to collisions. Reducing the impact pressure compromises system stability, making it more sensitive to fluctuations in the backflow backpressure, while the impact pressure exhibits a positive correlation with the longitudinal amplitude. Experiments validated the bifurcation behavior predicted by the theoretical model, confirming “impact number 1, cycle number 1” as the optimal drilling mode. Furthermore, a collaborative optimization of key structural parameters using Six Sigma closed-loop optimization and backpropagation (BP) neural networks demonstrated that increasing the inner diameter of the impact piston’s rear end effectively reduces longitudinal vibrations. This study provides a theoretical basis and design guidance for preventing collision phenomena under high-frequency and high-pressure conditions and enhancing energy utilization efficiency.</p>

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Energy transfer and parameter optimization in a hydraulic rock drill with a fluid–structure interaction model

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Siyuan Chang,
  • Yelin Li,
  • Wei Ma,
  • Jiale Zhang,
  • Min Ye,
  • Xiang Tian,
  • Joseph Páez Chávez,
  • Yuchuan Ma

摘要

To address the issues of high energy consumption and component collisions caused by intense nonlinear vibrations during the drilling process of hydraulic rock drills, this paper proposes a modeling and optimization method based on wake oscillator theory. By establishing a fluid–structure interaction drilling dynamics model that incorporates axial and longitudinal vibration impacts, combined with rock contact theory, the study systematically reveals the influence patterns of impact frequency and pressure on the system’s dynamic characteristics and energy utilization efficiency. As the impact frequency increases, the system undergoes period-doubling bifurcation and saddle-node bifurcation, accompanied by a decline in energy utilization efficiency. Within the chaotic regime induced by bifurcation, energy utilization shows a slight recovery; however, the increased longitudinal amplitude tends to exceed the design clearance, leading to collisions. Reducing the impact pressure compromises system stability, making it more sensitive to fluctuations in the backflow backpressure, while the impact pressure exhibits a positive correlation with the longitudinal amplitude. Experiments validated the bifurcation behavior predicted by the theoretical model, confirming “impact number 1, cycle number 1” as the optimal drilling mode. Furthermore, a collaborative optimization of key structural parameters using Six Sigma closed-loop optimization and backpropagation (BP) neural networks demonstrated that increasing the inner diameter of the impact piston’s rear end effectively reduces longitudinal vibrations. This study provides a theoretical basis and design guidance for preventing collision phenomena under high-frequency and high-pressure conditions and enhancing energy utilization efficiency.