In the whole lunar surface drilling and sampling task, it is critical to make the operation of the drilling and sampling impact system efficient and reliable. This paper focuses on how to improve the impact stress obtained at the cutting edge of the drill bit. Firstly, with the objective of maximizing the output impact energy, the design parameters of the percussive mechanism are optimally selected; based on the one-dimensional stress wave transfer theory, the collision input model and transfer models of impact stress in the drilling tool are established. Secondly, in order to verify the above design parameters and theoretical models, the percussive drive characteristics’ test and the transfer characteristics’ tests of impact stress in the drill stem and drilling tool joints are carried out in turn. The experimental results are consistent with the theoretical analysis, which clarifies the transfer characteristics of the impact stress at the various stages of generation, incidence, and transfer to the cutting edge. It was finally found that increasing the percussive frequency and impact energy of the percussive mechanism as well as the contact stiffness of the collision surface can increase the incident impact stress of the drilling tool, while reducing the length of the screw connection between the drill bit and the drill stem can reduce the impact stress loss. This provides a theoretical reference for the design of the percussive mechanism and drilling tools in lunar surface drilling and sampling tasks.

中文翻译：

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月球取心钻冲击应力传递特性研究

在整个月面钻孔采样任务中，使钻孔采样冲击系统的运行高效可靠至关重要。本文重点研究如何提高钻头切削刃处获得的冲击应力。首先，以输出冲击能量最大化为目标，优化选择冲击机构的设计参数；基于一维应力波传递理论，建立了钻具冲击应力的碰撞输入模型和传递模型。其次，为了验证上述设计参数和理论模型，依次进行了钻杆和钻具接头冲击应力的冲击驱动特性试验和传递特性试验。实验结果与理论分析一致，阐明了冲击应力在产生、入射和传递到切削刃的各个阶段的传递特性。最终发现，增加冲击机构的冲击频率和冲击能量以及碰撞面的接触刚度，可以增加钻具的入射冲击应力，同时减少钻头与钻具之间的螺纹连接长度。钻杆可减少冲击应力损失。这为月球表面钻探和采样任务中的冲击机构和钻具的设计提供了理论参考。并转移到最前沿。最终发现，增加冲击机构的冲击频率和冲击能量以及碰撞面的接触刚度，可以增加钻具的入射冲击应力，同时减少钻头与钻具之间的螺纹连接长度。钻杆可减少冲击应力损失。这为月球表面钻探和采样任务中的冲击机构和钻具的设计提供了理论参考。并转移到最前沿。最终发现，增加冲击机构的冲击频率和冲击能量以及碰撞面的接触刚度，可以增加钻具的入射冲击应力，同时减少钻头与钻具之间的螺纹连接长度。钻杆可减少冲击应力损失。这为月球表面钻探和采样任务中的冲击机构和钻具的设计提供了理论参考。同时减少钻头与钻杆的螺纹连接长度可以减少冲击应力损失。这为月球表面钻探和采样任务中的冲击机构和钻具的设计提供了理论参考。同时减少钻头与钻杆的螺纹连接长度可以减少冲击应力损失。这为月球表面钻探和采样任务中的冲击机构和钻具的设计提供了理论参考。