Study On Attenuation Characteristics Of Fluid Silencer Based On Resonant Corrugated Membrane

With the increasing pollution of hydraulic noise, the popularization and application of advanced hydraulic transmission technology are greatly limited. Developing a class of fluid silencers with high performances in the field of engineering becomes urgent. Based on the principle of dynamic vibration absorber, this paper proposes a fluid silencer based on resonant corrugated membrane for hydraulic system in view of the disadvantages of existing silencers. With corrugated membrane, which is characterized by its high vertical deflection sensitivity, as additional vibrator, silencers could absorb oil pressure fluctuation energy of hydraulic system so as to achieve an effective noise attenuation. Main contents and results are given as follows:Firstly, pressure fluctuation source of hydraulic system mainly contains two frequency components through the theoretical analysis of output flux of plunger pumps. The principle of structural dynamic vibration absorber is introduced and a fluid silencer based on corrugated membrane is presented, which suppresses pressure fluctuation by the resonation of corrugated membrane with fluctuation source.Secondly, finite element method is used to simulate the resonant frequency of corrugated membrane in fluid. The resonant frequency of corrugated membrane drops a lot due to the presence of fluid-structure interaction. It drops with the increase of radius and reduction of thickness, and rises with the decrease of wavelength and increase of amplitude.Thirdly, based on the theory of CFD, finite element analytical model of silencer based on corrugated membrane is built and simulation of its attenuation characteristic is also carried out with the help of software ADINA. Simulation results show that the silencer can effectively suppress the pressure fluctuation over a wide range and work best at the resonant frequency of corrugated membrane in fluid.Finally, experimental test on prototype is conducted and results reveal a nice practical effect of fluid silencer based on corrugated membrane which is generally in agreement with simulation results and a better performance compared with silencer based on circular plate.