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Linear Multimodal Model for a Pressurized Gas Bladder Style Hydraulic Noise Suppressor

Abstract Pressurized bladder style in-line hydraulic noise suppressors are commonly used in industry for broadband pressure ripple reduction, but predictive models for these suppressors are not available in the literature. To address this shortcoming, a linear acoustic model is developed for a commercially available suppressor, in which the acoustic field is analyzed through expansion into multiple radial modes. Bladder mass, perforate layer impedance, and inlet/outlet extensions are included in the model, and transmission loss predictions are validated against experimental data. The presented theoretical model has been shown to correspond well to experimental data at frequencies below about 1300 to 2300 Hz, depending on system and precharge pressures. In addition, simulations show that small variations in bladder precharge temperature or rubber bladder mass do not significantly affect transmission loss. While inclusion of the perforate layer significantly affects modeling results, it is observed that better perforate layer models or experimental data are needed for accurate system modeling.