查询词典 percussion

The seventh chapter is conclusions and prospects, sums up the innovative ideas and research findings of the paper, puts emphasis on the new drilling tools and new technology of water-saving rotary percussion drilling, which has important environmental value, convenient, and easy to be popularized, at the same time, imperfections existed in study process of the paper were pointed out, and some suggestions were offered for further research.

第七章、结论与展望，总结了全文的主要创新与研究成果，强调了节水型回转冲击钻进新机具及其新工艺不仅简便实用、易于推广，而且具有重要的环境价值，同时也指出了课题研究过程中存在的不足之处，对进一步的研究工作提出了一些建议。

Elevator is used for hoisting drilling tool, pulling tube or percussion drilling.

升降机为提升钻具、起拔套管或进行冲击钻进用。

Compared with traditional drilling methods with turning drilling rig and percussion reverse circulation drilling rig, the mentioned drilling technology can improve drilling efficiency and quality.

较之传统的回转钻机和冲击反循环钻机钻进，旋挖钻进工艺提高了成孔效率和成孔质量，同时拓宽了旋挖钻机的应用领域。

Because of long and thin structure characteristics, and sustain high frequency impact load under erosive medium, the drill rod's serve condition is most rigorous, and drill rod is one of the most easily damage tool in the percussion drilling rock system.

由于细长的结构特征和在腐蚀性介质中承受高频冲击载荷，使钎杆成为服役条件最苛刻、在冲击式凿岩系统中最容易损坏的机件，钎杆寿命低是制约凿岩爆破技术进步的关键问题。

In this paper a finite element model with the moving heat source and mesh remove technique in software package ABAQUS is used to simulate the process of percussion drilling with ultrashort laser. The temperature profile and residual stress distributions around the laser-formed hole can be calculated by a sequentially coupled thermal-stress analysis.

本文尝试以有限元素分析软体ABAQUS，利用移动热源之观念及网格移除技术来模拟超快雷射的多脉冲钻孔加工过程，以描绘出钻孔周遭的温度分布曲线，并透过顺序偶合法分析其所造成的应力场分布情形。

percussion drilling ; rotary drilling ; jars ; performance ; parameter ; penetration rate

因此，冲击器是冲击旋转钻井中的核心工具，它的性能优劣决定了冲击旋

Gas drilling ; penetration rate ; rotary drilling ; percussion drilling ; rock breaking

气体钻井；机械钻速；旋转钻井；冲击钻井；岩石破碎

The percussion drilling method was named as "Father of Petroleum Drilling in the World" and became another great invention, next to the Four Great Inventions of Ancient China.

两千载井盐历史、八百年彩灯文化、亿万年恐龙遗迹、三百年川菜源流，展示着世界最古老的井矿盐都市、中国最厚重的盐文化遗存风彩。

New theater shows feature B-boys, who in Korea sometimes combine their syncopated hip hop beats with traditional Korean folk percussion to fuse new with old.

新的战区显示特征的B男生，他们在韩国，有时结合自身syncopated嘻哈节拍与韩国传统民俗打击乐融合新与旧。

The right lower posterior chest showed dullness on percussion with moist rales at the end of inspiration on auscultation.

证券交易所或股票交易所的信贷期通常为14天，此期结束时所有交易人必须为所购股票付钱

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。