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Abstract

In order to solve the problem of low frequency noise of engine, based on the principle of dual port asymmetric sound absorber, a kind of gradually changing size sound absorbing metasurface is designed to reduce the noise of engine acoustic liner. Firstly, the theoretical analysis model and simulation analysis model of the asymmetric resonance sound absorber are established, the noise reduction mechanism is revealed, and the influencing factors of the noise reduction effect are analyzed. Then an acoustic metasurface acoustic liner is designed based on the asymmetric resonance sound absorber. The noise reduction effect of the acoustic liner is analyzed in depth by using three methods: full model theoretical calculation, equivalent impedance theoretical calculation and COMSOL finite element simulation. Then, the parameters of this structure are optimized, and the influence of flow velocity on the noise reduction effect is considered by using the full model theoretical calculation and equivalent impedance theoretical calculation. The research results show that the acoustic metasurface acoustic liner designed based on asymmetric sound absorber can achieve noise reduction effect of more than 3 dB in a frequency band range from 252 to 692 Hz when the thickness is only 2.5 cm (only 1/54 of the corresponding wavelength of 252 Hz), which provides a new idea for designing engine noise reduction.

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Authors and contacts

Corresponding author:Yu Dian-Long,dianlongyu@vip.sina.com

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 11872371), the Major Program of the National Natural Science Foundation of China (Grant No. 11991032), and the Hunan Provincial Science and Technology Innovation Program, China (Grant No. 2020RC4022).

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Cited By

DownLoad: Full-Size Img PowerPoint

	l/mm	a/mm		l/mm	a/mm		l/mm	a/mm
1	1.1	22	12	4.4	27	23	10.8	31
2	1.5	22	13	5.5	26	24	11.2	33
3	1.1	24	14	6.0	28	25	13.8	34
4	1.5	24	15	7.1	26	26	14.2	36
5	1.9	24	16	7.6	28	27	13.8	34
6	2.3	24	17	8.5	28	28	14.2	36
7	1.8	28	18	9.0	28	29	17.0	40
8	2.3	28	19	8.5	28	30	19.7	40
9	2.8	28	20	9.0	28	31	17.0	40
10	3.1	28	21	10.8	31	32	19.7	40
11	4.4	25	22	11.2	33	33	23	42
						34	23	42

DownLoad: CSV

非对称共振吸声器	f_cr	非对称共振吸声器	f_cr	非对称共振吸声器	f_cr
1	770	7	490	13	300
2	740	8	450	14	300
3	690	9	400	15	250
4	640	10	400	16	250
5	590	11	350	17	210
6	530	12	350

DownLoad: CSV

	l/mm	a/mm		l/mm	a/mm		l/mm	a/mm
1	2.4	22	12	6	27	23	14	31
2	2.5	22	13	7.5	26	24	13.5	33
3	2.7	24	14	7	28	25	14.8	34
4	2.8	24	15	9	26	26	14.5	36
5	3.5	24	16	8.5	28	27	17.5	34
6	3.6	24	17	9.7	28	28	17	36
7	3.45	28	18	10.2	28	29	17.1	40
8	3.65	28	19	11.5	28	30	17.6	40
9	4.45	28	20	12	28	31	20	40
10	4.65	28	21	12	31	32	21	40
11	6.6	25	22	11.5	33	33	23	41
						34	23	42

DownLoad: CSV

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Vol. 72, Issue 5 - 2023-03-05

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