Abstract:A reactive muffler is widely used to reduce the low-frequency noise generated by internal combustion engines, but it is often difficult to obtain ideal noise attenuation performance above the upper cutoff frequency range.This paper presented a case study on a novel application of U-shaped corrugated pipes in reactive muffler, which aimed to improve the noise attenuation performance above the upper cutoff frequency range.Typical performance parameters such as the insertion loss and pressure loss were experimentally evaluated.Besides, an index (improvement coefficient η) was proposed to weigh the improvement performance of corrugated pipes in noise attenuation and pressure loss.Results demonstrate that the application of U-shaped corrugated pipes in the reactive muffler significantly improves the noise attenuation performance above the upper cutoff frequency range and successfully extents the bandwidth of noise attenuation.In addition, the application of U-shaped corrugated pipes increases the pressure loss of the reactive muffler, reducing the aerodynamic performance of the muffler to a certain extent.Moreover, the overall improvement coefficient η reaches 1.12~1.13, indicating that the corrugated pipes make more contribution in noise attenuation than in pressure loss.In conclusion, this study verified that the application of U-shaped corrugated pipes in the reactive mufflers is feasible and acceptable, and it provides a novel method in the design of reactive mufflers.
薛飞 孙蓓蓓 陈建栋. U型波纹管在抗性消声器中应用可行性的实验研究[J]. 振动与冲击, 2018, 37(20): 230-236.
XUE Fei, SUN Beibei, Chen Jiandong. A study on the feasibility of the application of the U-shaped corrugated Pipes in reactive mufflers. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(20): 230-236.
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