露井联采区综放开采采动垂直应力分布规律研究

 为了评价露井联采区特厚煤层综放开采顶煤的冒放性以及为采场围岩控制提供依据，采用FLAC-3D数值模拟方法研究了平朔安家岭2#井工矿B902工作面条件下，露天矿边坡、排土场等因素对露井联采区综放开采采动垂直应力分布的影响。模拟结果表明，露井联采条件下，边坡周边岩体由三向应力状态转为二向应力状态；受边坡及排土场的影响，工作面前方6 m处的垂直应力最大值出现在远离边坡侧，偏离工作面几何中心的距离占工作面面长的5.3%，井工开采区和采空区区域沿工作面倾向剖面上垂直应力呈不对称分布；与工作面远离边坡侧的未开挖区域相比，邻近边坡侧的未开采区煤岩层中的垂直应力值和应力集中影响范围较小。

Fuzzy neural network control on valve-controlled motor speed servo system

A speed control method for the hydraulic valve-controlled motor system is presented based on the fuzzy-neural network control which introduces the fuzzy control into neural network. The simulation results show the self adaptive ability and controlling performance of the hydraulic valve-controlled motor system is improved.