Based on the research on rock burst phenomenon induced by the breakage of thick and hard roof around roadways and working faces in coal mines, a criterion of rock burst induced by roof breakage （RBRB） was proposed a...Based on the research on rock burst phenomenon induced by the breakage of thick and hard roof around roadways and working faces in coal mines, a criterion of rock burst induced by roof breakage （RBRB） was proposed and the model was built. Through the model, a method calculating the varied stresses induced by roof breakage in support objects and coal body was proposed and a unified formula was derived for the calculation of stress increment on support objects and coal body under different breaking forms of roof. Whilst the formula for calculating dynamic load was derived by introducing dynamic index Kd. The formula was verified in Huating Mine by stress measurement. According to the formula for stress increment calculating, the sensitivities of dynamic load parameters were further studied. The results show that the thickness and breaking depth of roof, width of support objeet are the sensitive factors. Based on the discussion of the model, six associated effective methods for rock burst prevention are obtained.展开更多
为了探讨元素之间的夹角对增量聚类算法的影响,受基于角度的异常点检测算法的启发,论文建立了一种基于角度度量的(Incremental Clustering Algorithm Based on Angle)动态增量聚类算法模型,利用元素之间的夹角对增加的数据进行合理的分...为了探讨元素之间的夹角对增量聚类算法的影响,受基于角度的异常点检测算法的启发,论文建立了一种基于角度度量的(Incremental Clustering Algorithm Based on Angle)动态增量聚类算法模型,利用元素之间的夹角对增加的数据进行合理的分配。针对KFCM(Kernal Fuzzy Cluster Method)算法随机获取聚类中心的缺陷,论文利用平均距离对算法做出改进,使KFCM算法能自动获取聚类中心。由于核函数对聚类结果有很大影响,对于如何选择核函数文中做了进一步的研究。实验结果表明针对不断增加的数据,本算法能够有效的处理各种数据集。展开更多
针对差分进化算法种群的多样性和收敛速度的矛盾问题,提出一种增强全局搜索能力的差分进化算法(简称MP-WDE)。首先,在种群初始化阶段将种群划分为多个子种群,分别采用不同的变异策略来提高种群的多样性。同时,利用动态递增的交叉概率因...针对差分进化算法种群的多样性和收敛速度的矛盾问题,提出一种增强全局搜索能力的差分进化算法(简称MP-WDE)。首先,在种群初始化阶段将种群划分为多个子种群,分别采用不同的变异策略来提高种群的多样性。同时,利用动态递增的交叉概率因子来提高进化过程种群多样性。最后,通过引入策略加权机制,将变异策略"DE/current-to-best/2"改进为加权变异策略"DE/current-to-best/2 or DE/current-to-rbest/2",以提高算法的收敛速度。通过与其他经典的改进差分进化算法在CEC2005的对比实验,该算法具有良好的寻优效果。无论在解的精度还是收敛速度方面都有所提高,因此MPWDE算法可以执行。展开更多
基金Project(2010CB226805) supported by the National Basic Research Program of ChinaProjects(30370412,30670558) supported by the National Natural Science Foundation of ChinaProject(SKLCRSM10X05) supported by the Self-research Program of the Key Laboratory of Coal Resources and Safe Mining,China
文摘Based on the research on rock burst phenomenon induced by the breakage of thick and hard roof around roadways and working faces in coal mines, a criterion of rock burst induced by roof breakage （RBRB） was proposed and the model was built. Through the model, a method calculating the varied stresses induced by roof breakage in support objects and coal body was proposed and a unified formula was derived for the calculation of stress increment on support objects and coal body under different breaking forms of roof. Whilst the formula for calculating dynamic load was derived by introducing dynamic index Kd. The formula was verified in Huating Mine by stress measurement. According to the formula for stress increment calculating, the sensitivities of dynamic load parameters were further studied. The results show that the thickness and breaking depth of roof, width of support objeet are the sensitive factors. Based on the discussion of the model, six associated effective methods for rock burst prevention are obtained.
文摘为了探讨元素之间的夹角对增量聚类算法的影响,受基于角度的异常点检测算法的启发,论文建立了一种基于角度度量的(Incremental Clustering Algorithm Based on Angle)动态增量聚类算法模型,利用元素之间的夹角对增加的数据进行合理的分配。针对KFCM(Kernal Fuzzy Cluster Method)算法随机获取聚类中心的缺陷,论文利用平均距离对算法做出改进,使KFCM算法能自动获取聚类中心。由于核函数对聚类结果有很大影响,对于如何选择核函数文中做了进一步的研究。实验结果表明针对不断增加的数据,本算法能够有效的处理各种数据集。
文摘针对差分进化算法种群的多样性和收敛速度的矛盾问题,提出一种增强全局搜索能力的差分进化算法(简称MP-WDE)。首先,在种群初始化阶段将种群划分为多个子种群,分别采用不同的变异策略来提高种群的多样性。同时,利用动态递增的交叉概率因子来提高进化过程种群多样性。最后,通过引入策略加权机制,将变异策略"DE/current-to-best/2"改进为加权变异策略"DE/current-to-best/2 or DE/current-to-rbest/2",以提高算法的收敛速度。通过与其他经典的改进差分进化算法在CEC2005的对比实验,该算法具有良好的寻优效果。无论在解的精度还是收敛速度方面都有所提高,因此MPWDE算法可以执行。
