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Based on controllability of lαβ domain to color and embedding strategy of image bit plane,l,α,β component images are changed according to proposed Combination Bit Plane rule.

利用lαβ域对颜色的控制力和图像位平面的嵌入策略特点，按照提出的组合位平面规则l、α、β分量图进行改变。

Cone bit ; bit bearing ; stress analysis ; finite element analysis

牙轮钻头；钻头轴承；应力分析；有限元法

The bit has a cone rotatably mounted to a bearing pin of the bit body.

钻头具有可旋转地安装至钻头体牙轮轴(19)的锥体(29)。

To enhance the reliability of bearing seal of cone bit, this paper plans to adopt face-radial combination sealing structures; that is to say, end-face and radial seal are arranged in one bit simultaneously. The nonlinear finite element method is applied to analyze and optimize the design of sealing structures.

为了提高牙轮钻头轴承密封的可靠性，本文设计采用端面-径向组合密封结构，即在一只钻头中同时布置端面和径向密封，采用非线性有限元方法对密封结构进行分析和优化。

Making the full use of the theoretical knowledge of FEA,contact mechanics and friction wear,and integrating with the research of other domestic and international scholar. Starting with analyzing working characteristics of journal bearing of roller cone bit, we finished the contact FEA of the journal bearing and the thrust bearing, using ANSYS software. The tolerance ranges of journal bearing of a roller cone bit are specially studied.

本文利用有限元、接触力学和摩擦学理论知识，同时结合国内外其它学者的研究，从分析牙轮钻头滑动轴承的工作特性入手，利用软件ANSYS完成了牙轮钻头中大、小轴承及止推轴承的接触有限元分析工作，对牙轮钻头滑动轴承的尺寸公差的取值，进行了专门的研究和探讨。

In this paper,the situation and data in the test on testing table are presented,which are compared with those of three cone bit,obtaining an important result in applying this kind of bit.

文中介绍了在试验台上的试验情况和数据，并与三牙轮钻头进行了比较，得出了应用该钻头的重要结论。

In this paper, the vibration characters of the Roller Cone Rock Bit which are caused by interaction bit/formation and elastic deformation are analyzed and studied deeply and in detail.

本文对在钻井过程中由于牙轮钻头与岩石互作用及钻柱的弹性变形导致牙轮钻头和钻柱在钻井过程的振动问题进行了深入地分析研究。

In this paper, using the method of computer simulation, on the basis of the cone bit geometry and inematics models and the interaction model of bit and rock, the established models are solved through the MATALB programming.

利用计算机仿真方法，在已建立的牙轮钻头几何学、运动学模型和钻头与岩石互作用模型的基础上，通过MATLAB 编程，求解所建立的各模型。

The dynamics of roller cone bit under the interaction of drilling string,bit and rock during the drilling process was investigated.

摘要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 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。

Objective:To compare the response control and attention of Schizophrenic patients with that of the healthy controls by Integrated Visual and Auditorycontinuous performance test. To quantitate the impairment of cognitive function in patients, and to explore the relationship between cognitive function and the severity of the disorder.

目的：探讨精神分裂症病人在IVA持续操作测试中的反应控制能力、注意力等，并与健康人进行比较，从而量化精神分裂症病人的认知功能损害，并进一步探讨其认知功能与疾病严重程度的关系。

Main effective factors including subcooling degree, mechanical vibration, gas hydrate reformation, environment temperature, noncondensing gas and surfactant are analyzed.

指出过冷度、机械振动、重复生成水合物、环境温度、不凝性气体、添加剂是影响气体水合物生成的主要因素，还对R152a水合物的放冷进行了实验研究。