Analysis of Low-Frequency Sound Absorption Performance and Optimization of Structural Parameters for Acoustic Metamaterials for Spatial Double Helix Resonators

• Published in: Crystals (Basel) Vol. 14; no. 10; p. 887
• Main Authors: Luo, Yuanqing, Yu, Tao, Kang, Shuang, Zhang, Dacheng, Liu, Shiyue, Tian, Xueyong, Sun, Feng
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.10.2024
• Subjects: Absorbers (materials); Absorptivity; Acoustic absorption; acoustic metamaterials; Acoustic properties; Acoustic resonance; Acoustics; Back propagation; Composite materials; Design; Frequency analysis; Frequency variation; Impedance; LF noise; Mathematical analysis; Metamaterials; Noise control; Numerical analysis; Numerical models; Optimization algorithms; Optimization models; parameter optimization; Parameters; Reactance; Resonance; Resonators; Simulation methods; sound absorption; Sound propagation; Sound transmission; Sound waves; spatial double helix resonator
• ISSN: 2073-4352; 2073-4352
• DOI: 10.3390/cryst14100887

Low-frequency noise absorbers often require large structural dimensions, constraining their development in practical applications. In order to improve space utilization, an acoustic metamaterial with a spatial double helix, called a spatial double helix resonator (SDHR), is proposed in this paper. An analytical model of the spatial double-helix resonator is established and verified by numerical simulations and impedance tube experiments. By comparing the acoustic absorption coefficients of the spatial double-helix resonator, it is shown that the results of the analytical model, the numerical model, and the experiments are in good agreement, proving the accuracy of the theoretical model. The effects of different structural parameters on the peak sound absorption coefficient and resonance frequency are quantitatively revealed. The impedance variation law of the model is obtained, and the resistance and reactance distributions at the resonance frequency are analyzed. In the optimization model, the Back Propagation (BP) network is used to construct the mapping between the structural parameters and the resonance frequency and sound absorption coefficient, and this is used as the constraints of the equation, which is combined with Wild Horse Optimization (WHO) to establish the BP-WHO optimization model to minimize the volume of the spatial double helix resonator. The results show that, for a given noise frequency, the optimized structural parameters enhance the space utilization without affecting the performance of the space double helix resonator.