钻取式自动采样机构螺旋钻杆结构参数的多目标优化

Multi-Objective Optimization of Drill Stem's Motion Parameter of Lunar Automatic Drill Sampling Mechanism

分析了螺旋钻杆的输出月壤原理和输出月壤阻力(阻力矩)以及综合考虑了螺旋槽内月壤对钻杆驱动力矩的影响、螺旋升角的取值范围和钻杆的轴向钻进功率后建立了钻杆驱动力矩、轴向加载力及功耗的模型。利用该模型分析了钻杆外径、螺旋槽深、槽宽比及螺旋升角等结构参数对钻杆驱动力矩和轴向加载力的影响,获得了钻杆结构参数对钻杆驱动力矩和轴向加载力的影响规律。以钻杆质量和功耗最小为双优化目标,以钻杆外径、螺旋槽深、槽宽比及螺旋升角等结构参数为设计变量,基于遗传算法对钻杆结构参数进行了优化,优化后的功耗较优化前降低了31.8%,钻杆质量减小了23.3%。总体减少了钻探风险,可为钻取式自动采样机构的设计提供理论依据。

Based on the analysis of the output of lunar soil principle and the （resistance moment） output of lunar soil resistance of spiral drill stem, the impact of lunar soil in the spiral groove regolith on drill stem driving torque, the valued field of helix angle and axial drilling power drill stem are considered, and models of drill stem driving torque, axial loading force and power consumption model are established, then effects of structural parameters such as the outer diameter of drill stem, the depth of spiral groove, groove width ratio and helix angle on the driving torque and the axially loading force of drill stem are analyzed by using the above models, and the rule of effect of structure parameters on the driving torque and the loading axially force of drill stem is obtained. Both mass and power consumption of drill stem are selected to be two- objective optimization, outer diameter of drill stem, depth of spiral groove, groove width ratio, helix angle and other parameters are taken as design variables, and the structure parameters of drill stem are optimized by using genetic algorithm. The power consumption is reduced by 31. 8% and the mass of drill stem is reduced by 23. 3% after optimizations, thus reducing the risk of drilling and providing a theory basis for the design of automatic drill sampling mechanism.