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将微穿孔板吸声结构应用到外加旁支管路的管道卢源特性测量方法中,分析和仿真了单层及双层微穿孔板及其后腔结构采用不同参数(板厚、微孔直径、穿孔率、后腔深度等)时改变管道负载声阻抗的作用和影响。研究结果表明:改变板厚、微孔直径、穿孔率、管道横截面积比等参数,可以有效地改变负载声阻;改变后腔深度及微穿孔板与主体管道之间距离,可以有效地改变负载声抗;结合使用单层和双层微穿孔板结构,可以有效实现声抗在宽频带上的变化。通过有流和无流情况下的实验,验证了该方法的正确性和微穿孔板吸声结构在测量中的有效表现。给出了该测量方法实际应用中设计和应用微穿孔板吸卢结构的意见。
The micro-perforated plate sound-absorbing structure is applied to the pipeline with additional bypass pipeline Luyuan characteristic measurement method, the single-layer and double-layer micro-perforated plate and its back cavity structure are analyzed and simulated with different parameters (thickness, pore diameter, Perforation rate, back cavity depth, etc.) to change the role of pipe acoustic impedance and influence. The results show that changing the parameters such as plate thickness, pore diameter, perforation rate and pipe cross-sectional area ratio can effectively change the load acoustic impedance. Changing the depth of the back cavity and the distance between the micro-perforated plate and the main pipe can be effectively changed Load acoustic impedance; combined with single-layer and double-layer micro-perforated plate structure, can effectively achieve the acoustic impedance in the broadband changes. Through the experiments with and without flow, the correctness of the method and the effective performance of micro-perforated plate sound-absorbing structure in the measurement were verified. The design and application of micro-perforated plate suction structure in practical application are given.