提示
冻结道砟单轴压缩试验的离散元细观参数优化
首发时间：2024-07-05
摘要：为高效准确确定离散元细观参数，针对冻结道砟单轴压缩试验的离散元模拟，基于plackett-burman试验设计和box-behnken响应面法进行模型参数优化。以线性接触弹性模量、摩擦系数、粘结弹性模量、抗拉强度和黏聚力为试验因素，以冻结试样的宏观弹性模量和抗压强度为试验指标，采用plackett-burman试验筛选出对试验指标影响显著的试验因素，采用box-behnken响应面试验进行离散元细观参数优化并验证。优化结果表明，线性接触弹性模量、摩擦系数和粘结弹性模量是影响显著的试验因素，对应的最优参数分别为62.461 gpa、0.281和8.109 gpa。采用优化后参数计算得到的宏观弹性模量和抗压强度结果与对应物理试验结果的相对误差分别为0.97%和0.19%。该优化方法对离散元参数确定具有一定参考意义。
关键词：
for information in english, please click here
parameter optimization of discrete element model of frozen ballast uniaxial compression tests
abstract：aiming at effective and accurate determination of the discrete element parameters, plackett-burman experimental design and box-behnken response surface design were adopted to optimize discrete element model paramerters of frozen ballast uniaxial compression tests. linear elastic modulus, friction coefficient, bonding elastic modulus, tensile strength and cohesive force were chosen as experimental factors. macroscopic elastic modulus and compressive strength of frozen specimens were selected as experimental indicators. plackett-burman experimental design was employed to screen for significant factors, box-behnken response surface design was used to optimize discrete element parameters. the results show that linear contact elastic modulus, friction coefficient and bonding elastic modulus are significant factors. the corresponding optimal discrete element parameters are 62.461 gpa, 0.281 and 8.109 gpa, respectively. the relative errors of macroscopic elastic modulus and compressive strength between results obtained with optimized parameters and those from physical experiments are 0.97% and 0.19%, respectively. this optimization method may shed some light on discrete element parameters determination.
keywords：
论文图表：
引用
导出参考文献
no.****
同行评议
勘误表
冻结道砟单轴压缩试验的离散元细观参数优化
评论
全部评论