Parameter Optimization And Simulation Research Of Multi-cell Thin-walled Energy-absorbing Components For Anti-impact Hydraulic Support Columns

Energy absorption component is the core component to make the anti-impact support effectively play the role of displacement and impact arrest.Under the trend of deep mining of coal resources,the problem of disasters caused by frequent occurrence of rock burst is becoming more and more serious.Therefore,it is of great scientific significance to carry out innovative design and performance research on energy absorption component of anti-impact support to obtain excellent energy absorption characteristics.Multi-cell thin-walled energy absorption components have the advantages of stability and effectiveness in energy absorption,which are widely used in automobile,artillery,ship and aerospace fields.In this paper,multi-cell thin-walled energy absorption components are applied to anti-scaffolding,and the theoretical analysis and simulation research of multi-cell thin-walled energy absorption components are carried out.Firstly,according to the principle of the energy-absorbing components of the anti-scaffolding bracket,the design requirements of the energy-absorbing components are clarified,and the evaluation parameters of the energy-absorbing characteristics of the energy-absorbing components such as the peak value of the initial reaction force,the energy absorption,the average reaction force and the standard deviation of the reaction force are determined.Combined with the structural size of the energy-absorbing component of the ZQ3300 anti-scaffold,the geometric parameters and cross-section shape of the multi-cell thin-walled energy-absorbing component were designed,and the multi-cell thin-walled energy-absorbing component of the anti-scaffold column with circular and polygon mixed cross-section was obtained.Secondly,based on the simplified super-folding element(SSFE)theory,the energy dissipation paths of different types of multi-cell thin-walled energy-absorbing components are analyzed,and five basic deformation elements,such as circular,Y-shaped and T-shaped,are divided.The equilibrium equation of energy absorption of multi-cell thin-walled energy-absorbing components under axial crushing is constructed,and the prediction models of average support reaction force of two kinds of energy-absorbing components with equal thickness and non-equal thickness are deduced,which provides a theoretical basis for simulation.Thirdly,according to the simplified model and material constitutive relation,the finite element model of the energy-absorbing component of the anti-scaffold column is established by ABAQUS explicit dynamic module.The axial crushing simulation of the energy-absorbing component is carried out,and the energy absorption and reaction force curves and buckling deformation forms of different types of multi-cell thin-walled energy-absorbing components are obtained.According to the simulation results,the multi-cell thin-walled component(P8-2 type)with the mixed cross-section shape of circular and octagonal and the layout of extended ribs with relative energy absorption advantages was selected as the energy absorption component of the column of the anti-impact bracket,and the influence of the cross-section size of the embedded tube,the thickness of the thin-walled tube wall and the thickness of the ribs on the energy absorption effect of the P8-2 energy absorption component was investigated.The simulation and theoretical results are compared and analyzed,which verifies that the average reaction force prediction model based on SSFE theory has high reliability.Finally,referring to the working conditions of ZQ3300 anti-scour support and relying on the uniform test data,the multivariate nonlinear regression equation is fitted to characterize the functional relationship between structural parameters and energy absorption characteristics parameters.Based on the regression equation,the NSGA-II genetic algorithm was used to optimize the solution,and finally the multi-cell thin-walled energy-absorbing member with the cross section size of 122 mm,the wall thickness of 2.6 mm and the rib thickness of 2.7 mm was selected.Through the verification and comparative analysis of the crushing simulation,the results show that the optimized multi-cell thin-walled energy absorption component has better energy absorption effect and smaller support reaction force fluctuation,which can make the displacement and impact prevention process more reliable and has high engineering application value.