Combining the optimization and FEM technology,crashworthiness of aluminum extrusions was studied for an automobile safety plan.The effects of longitudinal stiffeners on the crushing of stiffened square columns were st...Combining the optimization and FEM technology,crashworthiness of aluminum extrusions was studied for an automobile safety plan.The effects of longitudinal stiffeners on the crushing of stiffened square columns were studied considering the damage evolution.The numerical analysis was carried out by ABAQUS software.Subsequently,the collapse behavior of aluminum extrusion damage was validated by comparing against solution published in literature.Finally,in order to find more efficient and lighter crush absorber and achieving minimum peak crushing force,response surface methodology(RSM) has been applied for optimizing the aluminum extrusion tube.展开更多
文摘本文提出一种拓展窗口喷泉码EWF(Expanding Window Fountain)的改进方法,该方法可在无反馈与重传机制的情况下,为数据提供不等差错保护UEP(Unequal Error Protection),适用于轨道交通中车-地无线信息传输的差错保护。该编码方案中所有的窗口都选用相同的度分布,将度数值作为窗口选择的影响因素,按照度的取值确定可选的窗口。本文阐述了新方法的思想,通过在无损信道下的仿真验证该方法的性能。仿真结果表明,与EWF算法相比,新方法在不影响重要信息比特MIB(More Important Bits)保护性能的前提下,降低了次要信息比特LIB(Less Important Bits)的误比特率。采用此方法,可以有效提高车-地无线信息传输的差错保护性能。
文摘Combining the optimization and FEM technology,crashworthiness of aluminum extrusions was studied for an automobile safety plan.The effects of longitudinal stiffeners on the crushing of stiffened square columns were studied considering the damage evolution.The numerical analysis was carried out by ABAQUS software.Subsequently,the collapse behavior of aluminum extrusion damage was validated by comparing against solution published in literature.Finally,in order to find more efficient and lighter crush absorber and achieving minimum peak crushing force,response surface methodology(RSM) has been applied for optimizing the aluminum extrusion tube.
