By drilling down to the column statistics in the table descriptor, you can discover that the six elements in the in list predicate happen to be the bottom six values in the frequency statistics.
通过深入在表描述符上的列统计信息，您可以发现在IN清单上的6个元素恰好是频率统计信息上的最后6个值。
All of these provide a reference date for the applications of vibration drilling with low frequency torsional vibration.
为低频扭振型的振动切削应用于生产实践提供了参考数据。
The article introduced methods of drilling shaker dynamic measurement based on IVC, taking damping coefficient, natural frequency and vibration model as examples.
并以振动筛阻尼系数、固有频率和振型为例，介绍了基于智能控件化虚拟仪器技术的钻井振动筛动态特性检测方法。
The finite model of the derrick and drilling platform connecting unit is built and the natural vibration frequency and the corresponding vibration mode of it are given here.
建立了该钻机井架与钻台结合体固有振动特性理论分析的有限元模型并给出了其固有振动频率结果和相应的主振型。
Through compaction hardness and analog shear rock failure test to drilling core, the paper discusses the possibility of discriminating downhole rock type by using rock acoustic emission frequency.
通过对钻井取心岩样压入硬度及模拟剪切的破岩试验，探寻利用岩石的声发射频率来判别井下岩石类型的可能性。
The system consists of microcomputer and transient wave converter etc For the measurement of working parameters of drilling machine such as impact energy or frequency, stroke and pressure.
本研究系采用微型计算机、波形存贮器等技术装备组成了凿岩机械冲击能、冲击频率、行程、压力等工作参数的微机测试系统。
The speed of main motor can be adjusted in variable frequency so as to adapt different cutting force and drilling speed.
主电机可变频调速，以适应不同的切削力和钻孔速度。
Geometrical optics approach can only calculate the high frequency approach solution of drilling bit vibration source wave equation in non caustic area but it become invalid in caustic area.
由于几何光学法求解钻头震源波动方程的高频近似解有局限性，即在焦散区失效，故只能计算非焦散区的高频近似解。
According to the problems of blocked chips and hole qualities in the drilling of small caliber gun barrel, a installation of low-frequency vibration drilling is designed.
针对小口径火炮身管钻削加工时存在的切屑堵塞和内膛质量问题，设计了一套低频振动装置。
The rule of lateral vibration under axial load was studied in theory, the inherent frequency of drilling string was obtained.
从理论上分析了轴向载荷存在的情况下钻柱横向自由振动的规律，获得了钻柱横向振动固有频率。
Low penetration as well as drilling incidents of high frequency resulted from problems caused by leakage, gas migration, collapsing sticking, well kick, blowout and so forth.
且常发生井漏、气侵、坍塌性卡钻、井涌与井喷等井下复杂问题，导致机械钻速低与钻井事故频发。
The effect of the detuning of the stiffness of drilling spindle on the frequency of double spindle drilling machine is discussed by using Perturbation theory of nearly equal frequencies.
运用近频摄动理论分析了双轴钻床钻轴刚度失谐后对钻轴系统固有振动频率的影响。
And we have CNC, CJK, Punch press, high-frequency heating machine, argon arc welding machine , drilling machine….
拥有数控车床，冲床，仪表车，锯床，高频电热机。脉冲氩弧焊机，电焊机，钻床等设备。
Crack size, hammer stroke frequency and rotary speed influence the drilling string fatigue life involve, in which the crack size and stroke frequency were two major factors.
影响钻柱疲劳寿命的因素包括钻柱裂纹尺寸、空气锤冲击频率、转盘转速等，而空气锤冲击频率与裂纹尺寸是影响钻柱疲劳寿命的两大主要因素。
Based on the study of ac frequency conversion power system, research is made on how to control and reduce drilling accidents in working procedure. An effective new way to safe drilling is provided.
摘要在对钻机交流变频调速动力系统的研究基础上，对该动力系统在钻探过程中如何控制和减少钻探事故的发生方面做了些探索，为安全钻探提供了一条有效的新途径。
Based on the study of ac frequency conversion power system, research is made on how to control and reduce drilling accidents in working procedure. An effective new way to safe drilling is provided.
摘要在对钻机交流变频调速动力系统的研究基础上，对该动力系统在钻探过程中如何控制和减少钻探事故的发生方面做了些探索，为安全钻探提供了一条有效的新途径。
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