采用单输入多输出 (SIMO)方法对螺杆泵驱动头进行实际测试 ,经过相干函数检验后 ,得到了真实的传递函数 ,采用基于传递函数的分量分析法求出了螺杆泵驱动头的模态参数 .该方法获得的参数和结论与实际情况相吻合 ,为进一步的理论研究提供了依据 The SIMO method was used to test the driving head of the screw pump. After the coherence function test, the real transfer function was obtained. The modal parameters of the driving head of the screw pump were obtained by using the component analysis method based on the transfer function The parameters and conclusions obtained by this method are consistent with the actual situation and provide the basis for further theoretical research