In designing a hydraulic pulsation attenuator (HPA), the size and effective frequency band are two factors needing to be compromised. To improve the performance of HPA under a given volume, this paper proposes a compound HPA (CHPA), which works by string-fluid resonance and attenuation of the expansion chamber. The numerical model of the CHPA is derived using the method of electric-hydraulic analogy and evaluated by simulation and experiments. The experiment results show that the average relative error of the frequency position is within 5 Hz. Finally, a numerical comparison study is demonstrated, indicating that the attenuation strength of the CHPA at given periodic pulsation frequency is higher than ECA, SBHR, STPA and BCA by 82.3 %, 71.2 %, 257.1 % and 65.1 %, respectively.

在设计液压脉动衰减器（HPA）时，尺寸和有效频带是需要折衷的两个因素。为了提高给定体积下HPA的性能，本文提出了一种复合HPA（CHPA），它通过串流共振和膨胀室衰减来工作。CHPA的数值模型是采用电动液压模拟方法推导的，并通过仿真和实验进行了评估。实验结果表明，频率位置的平均相对误差在5 Hz以内。最后，通过数值比较研究表明，在给定的周期性脉动频率下，CHPA的衰减强度分别比ECA，SBHR，STPA和BCA高82.3％，71.2％，257.1％和65.1％。