关键词: 液压脉动衰减器, 扩张室, 格林函数法, 一维解析法

Abstract: The Green's function method in the design theory of gas muffler was extended to calculate and analyze the filtering characteristics of the expansion chamber hydraulic pulsation attenuators with rectangular and square cross sections. In the range of plane wave cut-off frequency, the theoretical results of the insertion loss (IL) of these two types of pulsation attenuators might be well matched with the experimental measurements, which proved that this method might also be used to calculate the filtering characteristics of expansion chamber pressure dampers with rectangular and square sections. Besides, for the expansion chamber hydraulic attenuators with circular sections, in order to avoid the troubles caused by the coordinate system transformation, the one-dimensional analytical method was introduced, which was the most commonly used in the study of the acoustic characteristics of the muffles, and the calculation results were also in good agreement with the experimental measurements. By comparing the ID of these three different cross-section expansion chamber pulsation attenuators, it could be concluded that under the premise of controlling the circumference of the cavity of the expansion chambers, the circular section has the best filtering characteristics in the 2 kHz test band, the square section is the second, and the rectangular section has the worst pulsation attenuation performance.

Key words: hydraulic pulsation attenuator, expansion chamber, Green's function method, one-dimensional analytical approach