College of Mechanical Engineering,Liaoning Technical University

为提高防冲支架能量吸收性能以应对煤炭资源深部开采趋势下的冲击地压频发问题,提出了一种具有圆形与多边形混合截面的多胞薄壁吸能构件应用于防冲支架立柱。基于简化超折叠单元 (Simplified Super Folding Element,SSFE) 理论剖析了不同截面形状和肋板布局的多胞薄壁吸能构件能量耗散途径,构建了轴向压溃条件下吸能构件的能量吸收平衡方程,并推导出了等厚度和非等厚度 2 种吸能构件平均支反力预测公式;通过轴向压溃仿真获得了各类型多胞薄壁吸能构件吸能量曲线、支反力曲线以及屈曲变形形态,发现圆形与八边形混合截面、边延伸肋板布局的多胞薄壁吸能构件 (P8-2 类型) 具备相对吸能优势,深入考察了内嵌管截面尺寸、薄壁管壁厚和肋板厚度对其吸能效果的影响规律,即:3 种结构参数对弯曲褶皱形态和塑性铰数量影响显著,对吸能特性参数有着不同且非简单单向变化的影响趋势,同时验证了基于 SSFE 理论的平均支反力理论模型具有较高预测精度;依托均匀试验数据,拟合出了吸能特性参数关于构件结构参数的回归方程,并利用 NSGA-II 遗传算法进行优化求解,最终确定多胞薄壁吸能构件内嵌管截面尺寸为 122 mm,薄壁管壁厚度为 2.6 mm,肋板厚度为 2.7 mm;进一步通过轴向压溃仿真验证与对比分析,结果表明:经结构参数优化后的多胞薄壁吸能构件具备更好的能量吸收效果且支反力波动较小,可使让位防冲过程更加可靠,能够为防冲吸能构件设计提供有益参考。

In order to improve the energy absorption performance of the anti-impact support for coping with the frequentoccurrence of underground impact pressure under the trend of deep mining of coal resources, a multi-cell thin-walled energy-absorbing component with mixed circular and polygonal cross-section is proposed to be applied to the anti-impactsupport column. Based on the Simplified Super Folding Element (SSFE) theory, the energy dissipation paths of multi-cellthin-walled energy-absorbing components with different cross-sectional shapes and rib layouts are analyzed, the equilibrium equations for energy absorption of energy-absorbing components under axial collapse conditions are constructed, andthe prediction equations for the average support reaction force of two types of energy-absorbing components with equaland non-equal thickness are derived. The energy absorption curves, support reaction force curves and buckling deformation patterns of each type of multi-cell thin-walled energy-absorbing members are obtained through axial crush simulation.It is found that the multi-cell thin-walled energy-absorbing components with mixed circular and octagonal cross-sectionand edge-extended rib layout (type P8-2) have some relative energy absorption advantages, and the influence law of theembedded tube cross-section size, thin-walled tube wall thickness and rib thickness on its energy absorption effect is investigated in depth, namely, the three structural parameters have significant influence on the bending fold pattern andplastic hinge number, and have different and non-simple unidirectional influence on the parameters of energy absorptionchar-acteristics. The average support reaction force theoretical model based on the SSFE theory is verified to have a highprediction accuracy. Based on the uniform test data, the regression equations of energy-absorbing characteristic parameters on the structural parameters of the components are fitted, and the NSGA-II genetic algorithm is used to optimize thesolution, the cross-sectional size of the embedded tube of the multi-cell thin-walled energy-absorbing component is finallydetermined to be 122 mm, the wall thickness of the thin-walled tube is 2.6 mm, and the thickness of the rib plate is2.7 mm. Further verified by axial crush simulation and comparative analysis, the results show that the multi-cell thinwalled energy-absorbing component with optimized structural parameters has a better energy absorption effect and a lessfluctuation of the support reaction force, which can make the anti-scouring process more reliable. The study provides auseful reference for the design of anti-scouring energy-absorbing components.

国家自然科学基金面上资助项目(52174143,51874157)

田立勇,周禹鹏,孙业新,等. 防冲支架立柱多胞薄壁吸能构件能量吸收性能[J]. 煤炭学报,2023,48(5):2224−2235.

TIAN Liyong,ZHOU Yupeng,SUN Yexin,et al. Energy absorption performance of multicellular thin-walledenergy-absorbing components of anti-shock support columns[J]. Journal of China Coal Society,2023,48(5):2224−2235.