1) pull-back
回拖
1.
Pipe sticking phenomenon appears sometimes during pull-back stage of pipeline crossing with horizontally directional drilling, which results in crossing failure and great economic loss.
在水平定向钻穿越管道回拖环节中,容易出现卡管现象,导致穿越失败,造成巨大的经济损失。
2) trailing echoes
拖尾回波
1.
Based on the analysis of the experiment results via variable diameter buffer rod,it can be seen that,the variable diameter buffer rod can restrain the trailing echoes in some extent.
首先,对圆柱杆中导波的传播和频散特性进行了分析;然后,通过实验,对利用超声缓冲杆获取物料特征信号的可行性进行了验证;最后,文中通过变直径缓冲杆的实验分析发现,变直径缓冲杆可以在一定程度上抑制拖尾回波的出现,同时,在缓冲杆外部增加包覆层也会对特征信号的信噪比产生一定的影响。
3) back dragging force
回拖拉力
1.
Calculation of back dragging force of horizontal directional drilling machine;
应用水平定向钻安装管道时回拖拉力的计算方法
4) borehole enlargement by drawing back
回拖扩孔
5) pull-back force
回拖力
1.
Because of the complicated operation conditions, the pull-back force of pipeline crossing by horizontal directional drilling depends on the combined actions of various factors.
因为实际工况比较复杂,水平定向钻穿越的回拖力是各种因素共同作用的结果,所以,很难建立起与实际工况非常吻合的、具有普遍适用性的力学模型。
6) pipeline back-dragging
管道回拖
1.
Computer simulation can overcome many difficulties such as the lack of ground and money,too many parameters,and time span when simulating the pipeline back-dragging in directional drilling with ANSYS and APDL.
采用ANSYS并结合APDL语言对定向钻的管道回拖过程进行仿真,对回拖管道的应力和变形以及回拖力进行了分析,得出了管道应力沿中性轴径向对称分布,且距离中性轴越远值越大的规律。
补充资料：拖后腿
1.比喻牵制﹑阻挠别人或事物使不得前进。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条