关键词: 吸能液压支架, 负泊松比材料, 吸能结构, 优化设计

Abstract: In order to improve the energy absorption and supporting characteristics of energy absorption hydraulic supports, an energy absorption structure of lattice material with negative Poisson ratio was designed. Specific energy absorption performance and support force per unit mass performance of straight-edged concave star-shaped cells and concave hexagonal cells with circular cross section and rectangular cross section were investigated using simulation analysis methods. It was determined that the comprehensive performance of the cells with rectangular cross-section stepped edge concave stars  was the best. Using Workbench software based on parametric analysis, the influence rules of cell body height, cell body width, cell body thickness and cell body shrinkage of materials with negative Poisson ratio on energy absorption and support characteristics of the energy absorption structure were studied, and the neural network prediction model of energy absorption and support forces was established. The multi-objective parameter optimization mathematical model of energy absorption structures was established. The optimization mathematical model of energy absorption structures was solved based on fmincon function, and three local optimal solutions were determined. Through comparison and verification analyses, the optimal structural parameters of energy absorption structures were determined as follows. The height of the cell body is as 40 mm, the width of the cell body ia as 9.2 mm, the thickness of the cell body is as 10 mm, and the shrinkage of the cell body is as 5.2 mm.The maximum absorption energy of the optimal parameter energy absorption structures is as 1083.36 kJ, the average supporting force is as 2162.56 kN, and the supporting force fluctuation coefficient is as 1.123,the standard deviation of supporting force is as 28.58 kN. The support size is moderate and the supporting force is stable.

Key words: energy absorption hydraulic support, negative Poisson ratio material, energy absorbing structure, optimal design