钻柱在内外钻井液流共同作用下的横向振动

利用固液耦联振动理论的较新研究成果，在建立考虑内外钻井液液动压力的钻柱横向振动数学模型基础上，给出了求解其固有频率和振型函数的方法和步骤，并就钻柱在内外始并液流共同作用下的钻柱横向振动问题进行了机理分析。

Lateral vibration of drillstring under Joint action of inside and outside drill fluid flow.

By using the new achievement of the research on solid-liquid coupled vibration,and on the basis of the mathematic model for the lateral vibration of the drillstring considering the inside and outside fluid-dynamic pressure,the method and procedure for solving the functions of its natural frequency and vibration mode was presented,and the mechanism of the lateral vibration of the drillstring under the joint action of the inside and outside drill fluid now was analyzed.