Low frequency broadband sound insulation performance of an acoustic metamaterial panel supported on two sides
ZHANG Songyang1, CHEN Yongyong2, WANG Guangzhou1, WANG Leilei1, WANG Xiaopeng2
1.State Grid Henan Electric Power Company, Electric Power Research Institute, Zhengzhou 450052, China;
2.School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Abstract:Uner the background of the low-frequency sound insulation of power transformers, a kind of simple and lightweight local resonant acoustic metamaterial panel was proposed, which was made by closely bonding high-polymer sheets on the two sides of supporting frames, with a superior low frequency sound insulation capability compared with four-side supported metamaterial panels.Under the normal incident sound wave, the sound insulation performance was studied by finite element analysis (FEA).The results show that there is obvious sound transmission loss (STL) with a peak of 31 dB at 248 Hz.To broaden the STL low-frequency band, mass blocks were arranged on the metamaterial panel.The FEA results show that there are three STL peaks in the range of 152-560 Hz, with the highest STL of 26 dB, thus achieving broadband sound insulation effect to some extent.At the same time, a STL peak of 18 dB appears at 120 Hz.Finally, a sound insulation experiment platform based on small box was built, and it can be found that the experimental test results are in good agreement with the FEA results, which verifies the excellent low-frequency broadband sound insulation ability of the lightweight acoustic metamaterial panel, indicating the acoustic metamaterial panel supported on two sides has broad engineering application prospects.
张嵩阳1,陈勇勇2,王广周1,王磊磊1,王小鹏2. 两边支撑声学超材料板的低频宽带隔声性能研究[J]. 振动与冲击, 2020, 39(9): 254-259.
ZHANG Songyang1, CHEN Yongyong2, WANG Guangzhou1, WANG Leilei1, WANG Xiaopeng2. Low frequency broadband sound insulation performance of an acoustic metamaterial panel supported on two sides. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(9): 254-259.
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