流体激励诱发轴流泵结构振动计算方法

摘要

Abastract:The pressure pulsation of unsteady fluid flow in pumps can induce structural vibration. So, its calculation method is worth studying. In this paper, the structural vibration response induced by fluid pressure pulsation in an axial flow pump was simulated through the finite element analysis software, and the calculation data was processed and compared with the test results. The accuracy and feasibility of the method was analyzed. The results show that the calculation method can be used for forecasting blade-pass frequency vibration, and the ability of this method for high-order harmonic-frequency recog-nition can be improved by increasing the number of sampling points.%泵内非定常压力脉动会引发泵体的结构振动，而由压力脉动引发结构振动的计算方法是一个值得研究的问题。通过有限元分析软件对某台立式轴流泵内流体压力脉动引发的结构振动响应进行了仿真计算。将数据处理后与试验值进行了对比，并对该方法准确性和可行性进行了分析。结果表明：该计算方法可以用于已知压力脉动情况下叶频振动加速度的预估，若增加采样点个数，采样频率提高，可以提高叶频高次谐波频率的识别能力。