Aiming at the abnormal strata behavior in the advance entry of 1303 fully - mechanized working face in xinglongzhuang coal mine , the movement rule , characteristic , step distance of fracturing , position and mode of fracturing of the overlying strata in mining process is analyzed by using the key strata theory 摘要针对兴隆庄煤矿采区1303综放工作面超前平巷发生奇异压力的现象，采用关键层理论对在采动过程中的上覆岩层运动规律进行了详细的力学分析，研究了它们的运动特征、破断步距、断裂位置、断裂方式以及对工作面及其超前平巷的来压规律，对比分析了该工作面矿压实测数据与理论研究成果。
In accordance with the occurrence behavior of roof strata and the fracture characteristics of key stratum in shallow seam longwall mining , studied post - buckling behavior of roof key stratum in the process of mining by using initial post - buckling theory , which derived a critical load and a breaking span of the main roof during the first weighting , determined the final subsidence and the maximum rotation angle for broken key stratum , and presented an application with the example of daliuta 1203 face 摘要根据浅埋煤层顶板岩层的赋存特点和长壁开采时关键层的变形破断特征，应用初始后屈曲理论探讨了开采过程中顶板关键层的后屈曲性态，得出了老顶初次来压时顶板的临界载荷和破断步距，确定了顶板破断后的极限下沉量和回转角，并以神东矿区大柳塔1203工作面为例给出了工程实例。
By the advantage of high precision , strong anti - interference ability , long lifespan , etc , grating scale is the chief sensor in displacement measurement . however , as is restricted by the beam path structure , the scan frequency of the scaning circuit , etc , the maximum available measuring speed has a inverse proportion relationship to the measuring pace of a single grating scale 光栅尺具有精度高、抗干扰能力强、寿命长等优点,成为微纳米位移测量的主要工具,但由于受光路结构及信号检测电路扫描频率等因素的限制,单个光栅尺测量的最大允许移动速度与其测量步距成反比。
In the solution , the 0 - 1 integer and real number mixed encoding technique was employed to describe an artificial fish ; behaviors of a fish were dispatched by its body energy status ; the following behavior was described by the greedy method where moving step is direct ratio to a fish ' s hungry degree ; the lowest survival body energy controlling technique was used to realize escaping policy from locally optimum positions ; the maximum iterating times and the changing degree of the optimum solutions during iterating were used to control the terminating time 在解算过程中，人工鱼个体采用0 - 1整数和实数混合编码方法描述；用人工鱼体能累计和消耗程度来调度其行为；采用与饥饿程度成正比的移动步距的贪婪法描述个体追尾行为；采用最低生存体能控制来实现局部最优解逃逸策略；采用最大迭代次数和迭代过程中最优解平均值变化程度来控制迭代终止时机。
This paper proposes a new method to obtain any wanted stepping angle with adjustable and even subdivision . with the method , the stepping angle is n ' t restricted with different phase number and tooth number any longer . so the product arrangement of stepping motors and drives can be simplified 提出了通过任意均匀细分来实现任意步距角的新方法，从而打破步进电动机相数和齿数对步距角的限制，简化步进电动机及驱动器的生产格局，充分发挥机电一体化的系统效果。
In this paper , the drive theory of the large ratio friction transmission is studied ; a new type elliptical cam wave generator is designed ; the large ratio friction transmission prototype is designed and manufactured ; based on the ansys finite element method software , structure of the elliptical cam is analyzed ; precision index of the manufactured large ratio friction transmission prototype , such as transmission accuracy , least step , stability of the least step , load capacity is measured by the absolute rotary encoder . by analyzing the measurement data and research content , it is think that the new elliptical cam wave generator could overcome a good many problems brought by processing errors , facilitate size precision adjustments , input moment can be achieved in the form of a pure force couple importing ; through this study , " the large ratio friction transmission prototype " could apply in practical engineering basically 本文研究了大速比摩擦传动的传动理论;设计了新型椭圆凸轮波发生器,设计制作了大速比摩擦传动样机;用软件ansys对所设计的椭圆凸轮结构进行了有限元分析;用19位绝对式编码器测试了大速比摩擦传动机构的传动精度、最小步距、最小步距的稳定性以及带负载能力等各项精度指标;对测量数据和研究内容进行了归纳和整理,认为新型椭圆凸轮波发生器克服了加工误差带来的诸多问题,新型椭圆凸轮波发生器可以进行尺寸精度调整,能够达到输入力矩以纯力偶的形式输入;通过本项研究,基本可以使“大速比摩擦传动机构”在工程中得以应用。
The ground base of the newly added chute in 4 tailings reservoir at dexing copper mine is characterised by thick weathered layer , loose structure , fractured zone and landslip mass accumulation . as a result , the ground has a great subsidence and inefficient carrying capacity . in view of this , the grouting technology was adopted to reinforce the chute ground base . the on - site testing shows that the subsidence of the chute has been efficiently controlled and the carrying capacity of the ground base improved so that the stability requirement has been met 针对金山店铁矿余华寺采区的开采条件:拥有独立的开拓系统、产量不大、装备水平不高、矿岩松软破碎、地压大等,进行了无底柱分段崩落法采场结构参数的优化研究.通过室内物理、数值模拟和现场工业试验,探索出合理的分段高度、进路间距、放矿步距等参数,以求达到技术上可行经济上最优.该研究成果在矿山的应用中取得了可观的经济效益,为其它类似的中小型冶金矿山探索出一条提高经济效益的途径
Several mode of the subdividing drive are integrated in one system . so the control become multiplex . the displacement can be divided to whole step part and microstep part . microstep part is used to satisfy the precision of position , while whole step part is used to satisfy the speed of position 实现多重细分和变细分调速，提高了细分驱动的灵活性和可选择性；根据整步位移无控制误差，将点位行程拆分为整步位移部分和满足定位精度的微步距位移部分，分别以不同的细分数运行同时满足点位控制的速度与精度要求。
