On the basis of many experiments, the mechanics model for the interaction of roller cone bit and rock was established.
在大量单元实验的基础上，建立了牙轮钻头与岩石相互作用力学模型。
On the system dynamics, the dynamics model for roller cone bit under the interaction of drilling string and rock was established.
从系统动力学的角度出发，建立了基于钻柱、岩石相互作用下的牙轮钻头动力学模型。
The dynamics of roller cone bit under the interaction of drilling string, bit and rock during the drilling process was investigated.
研究了钻井过程中钻柱、钻头、岩石相互作用下的牙轮钻头动力学特性。
The failure mechanism of journal bearing of roller cone bit is analyzed, the failure type is adhesive wear, and main factors affecting the adhesive wear are analyzed.
分析了牙轮钻头滑动轴承失效的机理，论证了牙轮钻头滑动轴承失效形式主要为粘着磨损，分析了影响轴承粘着磨损失效的主要因素。
In the present SWD survey, roller-cone bit is widely used because of its advantages in signals recording and processing.
由于牙轮钻头在信号采集、处理等方面的优势，现阶段随钻地震测量主要采用的是牙轮钻头。
In the present SWD survey, roller-cone bit is widely used because of its advantages in signals recording and processing.
由于牙轮钻头在信号采集、处理等方面的优势，现阶段随钻地震测量主要采用的是牙轮钻头。
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