Pressure ripple attenuation performance of a pressurized gas bladder-type hydraulic noise attenuator during charging and discharging processes

Abstract

Inaccurate precharge pressure is the fundamental reason of poor pressure ripple attenuation performance of a pressurized gas bladder-type hydraulic noise attenuator (bladder attenuator). To tackle this issue, this paper proposed changing the initial volume of the bladder (V _a0 ) through charging and discharging the bladder for improving the attenuation performance of the bladder attenuator (APBA). Consequently, a mathematical model is established to investigate APBA when the bladder is charged and discharged. The results are shown as follows. Firstly, the APBA can be improved obviously when V _a0 is greater than 6.2 × 10⁻⁵ m³. Secondly, if the system pressure is smaller than the air pressure within the bladder, the bladder attenuator will lose its attenuation performance completely. Finally, the response time of the pneumatic system should be greater than 0.01 s when the bladder is charged, and less than 0.08 s when the bladder is discharged, which can avoid the poor APBA.