As a new efficient rock-breaking technology, harmonic impact drilling technology has received great attention, but the research on its rock-breaking mechanism is insufficient, which limits its development. Based on the theory of vibration, a simplified model of high-frequency harmonic vibration impact system is established in this paper. The numerical model was solved by Matlab and the motion equations of drill bit and rock at different stages of motion are obtained, respectively. Based on the factor analysis of the mathematical model, the dynamic characteristics of the impact system under harmonic excitation are studied. Finally, numerical simulations are carried out to further analyze the drilling effect of harmonic impact drilling and verify the correctness of the simplified model. The results show that when the excitation frequency equals the resonance frequency of rock, the vibration displacement of rock reaches the peak value. The drilling speed is greatly increased by harmonic impact drilling compared with conventional drilling.

中文翻译：

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谐波冲击下冲击钻系统的动力学分析

谐波冲击钻井技术作为一种新型高效破岩技术受到了广泛关注，但对其破岩机理的研究不足，限制了其发展。本文基于振动理论，建立了高频谐波振动冲击系统的简化模型。利用Matlab对数值模型进行求解，分别得到钻头和岩石在不同运动阶段的运动方程。在对数学模型进行因子分析的基础上，研究了谐波激励下冲击系统的动态特性。最后，通过数值模拟进一步分析谐波冲击钻井的钻井效果，验证简化模型的正确性。结果表明，当激振频率等于岩石的共振频率时，岩石的振动位移达到峰值。与常规钻孔相比，谐波冲击钻孔大大提高了钻孔速度。