Abstract
The pressure ripple attenuation performance (PRAP) of a pressurised bladder-type hydraulic noise attenuator (bladder attenuator) is investigated in this study based on mathematical model using the transfer matrix method and equations of state for an ideal gas and liquid. Transmission loss (TL) was selected as the metric for evaluating the PRAP of the bladder attenuator. The study investigated the impact of the ratio of the precharge gas pressure to the system pressure, bulk modulus and kinematic viscosity of the hydraulic oil, and structural dimensions of the perforated tube on the PRAP. The key findings are summarised as follows: First, the applicability of the mathematical model was validated using previously published methods and experimental data. Second, the ratio of the precharge gas pressure to the system pressure emerged as a crucial factor influencing the PRAP, particularly when the precharge gas pressure was lower than the system pressure. Finally, the bulk modulus and kinematic viscosity of the hydraulic oil demonstrated minimal effects on the PRAP, whereas increasing the inner radius and number of through-holes in the perforated tube was found to effectively enhance the PRAP.
Published Version
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