Numerical study on a compound hydraulic pulsation attenuator based on string-fluid resonance

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.