膜片式流体滤波器研究

Research on Diaphragm Fluid Filter

摘要: 针对载流薄板振动式流体滤波器的不足，结合鼓式消声器的工作机理，顾及滤波器适应液压系统的高压、稳态大流量、低压缩性及耐腐蚀等工况要求，提出了一种仿生膜片式流体滤波器，分析其工作机理并建立动力学模型，初步确定膜片式流体滤波器结构参数。其后，仿真分析了其动态特性，试验验证了理论分析的正确性。结果表明，在滤波器工作基频处的插入损失接近20 dB，2倍频处的插入损失接近15 dB。同时基频在115~180 Hz范围内，压力脉动衰减达到15 dB以上，说明滤波具有一定的带宽，具有较好的工程应用价值。

Abstract: In view of the shortcomings of the current carrying thin plate vibrating fluid filter, combined with the working mechanism of the drum muffler, and taking into account the requirements of the filter to adapt to the working conditions of the hydraulic system, such as high pressure, steady state large flow, low compressibility and corrosion resistance, a bionic membrane fluid filter is proposed, its working mechanism is analyzed, and a dynamic model is established to preliminarily determine the structural parameters of the membrane fluid filter. Then, the dynamic characteristics are simulated and analyzed, and the correctness of the theoretical analysis is verified by experiments. The results show that the insertion loss at the fundamental frequency of the filter is close to 20 dB, and the in-sertion loss at the second octave is close to 15 dB. At the same time, the fundamental frequency is in the range of 115~180 Hz, and the attenuation of pressure fluctuation is more than 15 dB, indicating that the filter has a certain bandwidth and has good engineering application value.