基于人工神经网络的共振吸声超材料声学性能快速预测及结构优化设计
doi: 10.21656/1000-0887.450170
Acoustic Performance Rapid Prediction and Structural Optimization for Resonant Sound-Absorbing Metamaterials Based on Artificial Neural Networks
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摘要: 针对共振吸声超材料声学性能快速预测及结构优化设计需求,提出了一种基于人工神经网络的共振吸声超材料性能预测方法. 首先, 建立了由微穿孔板和Helmholtz共振腔组成的多层穿孔型共振吸声超材料的理论模型,并通过仿真与实验验证其正确性;随后,通过理论模型生成数据集,并以此为基础,采用BP(back propagation)神经网络原理,搭建了结构特征参量与声学性能的人工神经网络模型;之后,将训练后的人工神经网络模型与遗传算法相结合,对共振吸声超材料进行声学性能最优化设计. 结果表明:训练后的人工神经网络模型可以对目标结构的吸声性能进行准确预测,并且预测效率相较理论模型提高50%以上;人工神经网络模型与优化算法的结合不仅能提高优化效率,优化后的结构也具有良好的低频宽带吸声性能. 人工神经网络为大规模结构性能预测计算提供了便利,在超材料等结构设计及优化领域具有广阔的应用前景.Abstract: A sound performance prediction method based on the artificial neural network (ANN) was proposed to meet the requirements of rapid prediction and optimization design of resonant sound-absorbing metamaterials. Firstly, a theoretical model was established for multilayer perforated resonant sound-absorbing metamaterials (MPRSMs) composed of microperforated panels and Helmholtz resonators, which was then verified through simulation and experiments; subsequently, a dataset was generated with the theoretical model, and in turn an ANN model was constructed by means of the back propagation (BP) neural network to build the mapping relationship between structural parameters and acoustic performances; afterwards, the trained ANN model was combined with the genetic algorithm to optimize the acoustic performance of the MPRSMs. The results show that, the trained ANN model can accurately predict the sound absorption performance of the MPRSMs, and the prediction efficiency improves by more than 50% compared to the theoretical model; the combination of the ANN model and the optimization algorithm can not only improve the optimization efficiency, but bring good low-frequency broadband sound absorption performance of the optimized structure. The ANN provides convenience for large-scale structural performance prediction calculations and has broad application prospects in structural design and optimization of metamaterials.
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Key words:
- resonant sound-absorbing metamaterial /
- artificial neural network /
- sound absorption coefficient /
- BP neural network /
- genetic algorithm
edited-byedited-by1) (我刊青年编委孟晗来稿) -
表 1 MPRSM结构模型几何参数
Table 1. Geometric parameters of the MPRSM structural model
geometric parameter value the 1st perforated plate thickness t1/mm 1.1 the 1st perforated plate hole diameter d1/mm 1.2 the 1st perforated plate back cavity thickness h1/mm 35 Helmholtz resonator back cavity thickness dc/mm 8 Helmholtz resonance cavity neck length dn/mm 2 Helmholtz resonant cavity neck radius rn/mm 1 the 2nd perforated plate thickness t2/mm 2.9 the 2nd perforated plate hole diameter d2/mm 1 the 2nd perforated plate back cavity thickness h2/mm 25 the 1st perforated plate perforation rate p1 0.024 7 the 2nd perforated plate perforation rate p2 0.020 4 structural unit cell length L/mm 31 表 2 用于人工神经网络模型训练的MPRSM结构参数取值范围
Table 2. MPRSM structural parameter values for the artificial neural network (ANN) model training
geometric parameter value range the 1st perforated plate thickness t1/mm 0.5~2 the 1st perforated plate hole diameter d1/mm 0.3~1 the 1st perforated plate back cavity thickness h1/mm 5~30 Helmholtz resonator back cavity thickness dc/mm 5~30 Helmholtz resonance cavity neck length dn/mm 1~5 Helmholtz resonant cavity neck radius rn/mm 0.5~2 the 2nd perforated plate thickness t2/mm 0.5~2 the 2nd perforated plate hole diameter d2/mm 0.3~1 the 2nd perforated plate back cavity thickness h2/mm 5~30 表 3 验证人工神经网络模型预测能力的四组结构参数
Table 3. Four sets of structural parameters for verifying the predictive ability of the ANN model
optimization parameter set 1 set 2 set 3 set 4 the 1st perforated plate thickness t1/mm 0.51 1.60 1.41 0.70 the 1st perforated plate hole diameter d1/mm 0.50 0.81 0.90 0.71 the 1st perforated plate back cavity thickness h1/mm 13.89 16.80 25.11 13.20 Helmholtz resonator back cavity thickness dc/mm 28.20 8.21 17.90 25.10 Helmholtz resonance cavity neck length dn/mm 4.10 3.10 3.50 3.70 Helmholtz resonant cavity neck radius rn/mm 0.50 1.21 0.80 0.90 the 2nd perforated plate thickness t2/mm 0.80 1.01 1.50 1.50 the 2nd perforated plate hole diameter d2/mm 0.40 0.80 0.70 0.60 the 2nd perforated plate back cavity thickness h2/mm 24.80 14.19 10.30 28.10 表 4 MPRSM结构优化参数取值范围以及优化结果
Table 4. Range of MPRSM structural optimization parameters and optimization results
optimization parameter value range optimization result the 1st perforated plate thickness t1/mm 0.5~2 0.51 the 1st perforated plate hole diameter d1/mm 0.3~1 0.89 the 1st perforated plate back cavity thickness h1/mm 5~30 27.90 Helmholtz resonator back cavity thickness dc/mm 5~30 29.90 Helmholtz resonance cavity neck length dn/mm 1~5 4.81 Helmholtz resonant cavity neck radius rn/mm 0.5~2 0.50 the 2nd perforated plate thickness t2/mm 0.5~2 0.50 the 2nd perforated plate hole diameter d2/mm 0.3~1 0.41 the 2nd perforated plate back cavity thickness h2/mm 5~30 15.88 -
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