Design to hydraulic system for micro directional drilling machine 微型定向钻液压系统的设计
Application of matlab to directional drilling crossing engineering 在定向钻穿越优化设计中的应用
The effect of horizontal directional drilling in soft soil on the near environment during installing pipes 软土地区水平定向钻施工对周围环境的影响
With concrete measures adopted , the pipeline crossing with directional drilling technique in rocky stratum of middle reaches of yangtse river succeeded for the first time 通过具体实施,在长江中游岩石层中首次采用水平定向钻技术穿越原油管道获得成功。
In combination with a project schedule management case of pipe horizontal direction drill project , the author analyzes its network program with monte carlo simulation technique , and then comes to the conclusion that the stochastic network program can give more substantial schedule information to the project manager than ordinary network program 结合管道水平定向钻穿越工程进度管理实例,在其网络计划中应用蒙特卡洛仿真技术进行分析,以概率形式确定关键工作和施工工期,为项目经理进行进度管理提供更多更充实信息。
In order to generally analyze the performance of the horizontal directional drill ( hdd ) , several subsystem models , e . g . mechanical subsystem model , hydraulic subsystem model , strength model and control subsystem model are built and integrated into a whole virtual hdd model through parameter associations 摘要为了全面分析水平定向钻的性能,针对不同领域,分别建立了机械、液压、强度和控制等子系统模型,通过参数关联形成了一个完整一致的水平定向钻整机虚拟样机模型。