Abstract: In order to solve the problem of vibration and noise caused by the pressure fluctuation in hydraulic system, the principle of elastic thin plate hydraulic pulsation attenuator is proposed. The mass of structural vibration muffler is replaced by elastic thin plate, so the fluid of static equilibrium orifice and the balanced cavity constitutes a Helmholtz resonator, and the thin elastic plate and the fluid constitute a forced coupled vibration system. The structural vibration resonation and fluid resonation are combined in one attenuator, so the shortcoming of bulkiness of traditional pulsation attenuator is also overcome successfully. Based on the dynamic characteristics of the pipeline, and combined with the specific dynamic load, the transfer matrix model of the pulsation attenuator is derived, and the pulsation attenuation function is simulated. The relationship between main structural parameters and the dynamic attenuation characteristics of the pulsation attenuator is analyzed. According to the results of simulation, the prototype of thin plate hydraulic pulsation attenuator is fabricated and the experimental study is carried out. The theoretical and experimental results are compared and analyzed, which indicate that the attenuator is very effective in hydraulic pulsation attenuation with broad frequency band.

Key words: Hydraulic pulsation attenuator, Pressure pulsation, Thin elastic plate, Transfer matrix