中文摘要：

利用MATLAB软件对钻井泵阀阿道尔夫微分方程进行了数值求解，并构造了描述阀盘关闭阶段的简化模型，准确地分析了阀盘的运动特性。通过对不同阀盘锥角的锥阀进行仿真计算得出，当阀盘下底面直径一定时，随着阀盘锥角的增加，阀盘的关闭速度及关闭冲击力都相应地减小，进而可以有效改善阀盘冲击阀座形成的冲击疲劳。该结论对泵阀的优化设计及延长泵阀使用寿命有重要的指导意义。

英文摘要：

U-Adolph exact differential equation for drilling pump valve is numerically solved by MATLAB in this paper, and a simplified model for describing the closing stage of valve disk is put forward, so the motion characteristic of valve disk is analyzed truly. From the result of simulation and computation by different cone-angle of poppet valve, it ＇s found that when the diameter of the bottom surface of the valve disk is invariable, by increasing the cone-angle, the velocity and the impact force of valve disk in closing are reduced accordingly, so the impact fatigue produced by the impaction between valve disk and valve seat is reduced effectively. The conclusion is beneficial to the optimizing designing and extension of the service life for the pump valve.