Abstract: To better understand the pulsation characteristics of the conjugated straight-line internal gear pumps output flows, the secondary source method was deduced, the error parameters which might be introduced from each stages were analyzed, and the effects of each parameter on the accuracies of test results were also evaluated. Then, the calculation methods of impedance fitting and flow pulsation were derived in detail, and the visual data processing software was compiled. Finally, a test platform was built to test the output flow pulsations of the pumps. Compared with theoretical values, the test results show that the flow pulsation data processing method is accurate and feasible. The output flow pulsations of conjugated straight-line internal gear pumps are dominated by first-order line spectrum, and decrease first and then increase with the increases of rotation speeds.

Key words: internal gear pump, flow pulsation, secondary source method, impedance fitting, weighting coefficient method

摘要： 为准确掌握直线共轭内啮合齿轮泵的输出流量脉动特性，推导分析了“二次源”流量脉动测试方法，分析了各阶段可能引入的误差参数，评价了各参数对测试结果准确度的影响；详细推导了阻抗拟合和流量脉动的计算方法，并编译了可视化数据处理软件；最后搭建测试平台，实测直线共轭内啮合齿轮泵的输出流量脉动曲线，与理论曲线进行了对比。测试结果表明：采取的流量脉动数据处理方法准确可行；该直线共轭内啮合齿轮泵输出流量脉动以一阶线谱为主，且随转速的增大先减小后增大。

关键词: 内啮合齿轮泵, 流量脉动, 二次源法, 阻抗拟合, 加权系数法