中文摘要：

对不同工况下轴流模型泵装置各主要测点处的振动加速度信号进行动态测量和分析,获得了特定频域范围内振动加速度均方根值随流量的变化规律。实验结果表明：10～8000 Hz频域范围内振动加速度均方根值随流量的变化趋势和泵扬程随流量的变化趋势基本一致,运行工况从大流量降至小流量的过程中其装置振动水平可分为低水平区、快速增长区及高水平区;10～350 Hz频域范围内低水平区中振动最低点对应的流量和泵最优工况流量基本一致。研究结果为轴流泵多工况下的稳定运行及最优工况判定提供了一定的理论和技术基础。

英文摘要：

The vibration acceleration at different measuring points of axial-flow pump under different operating conditions were measured, and then the relationship between root mean square value of vibration acceleration within specific frequency domain and flow rate of pump were obtained. The experimental results show that the trends of root mean square value of vibration acceleration within 10-8000 Hz frequency domain with flow rate is the same as trend of head of pump with flow rate. With the decrease of flow rate, the changing process of vibration level can be divided into three stages： low-level stage, rapid increase stage and high-level stage. Within 10-350 Hz frequency domain, the flow rate according to lowest vibration level point in low-level stage is the same as flow rate of best efficiency point. The research achievements are helpful to provide some theoretical basises for axial-flow pump＇s stable operation and recognition of best efficiency point.