seismic thumper

Dynamic mathematical model for valve-controlled MWD hydraulic signal generator;

随钻测量阀控式液压信号发生器动态数学模型

This paper deals with the problem of optimize valve-hole design of hydraulic pulse generator,and give out the design formular.

本文讨论了用于液压振动系统的强制配流液压脉冲发生器阀口开口最佳设计问题 ,并给出了计算公