Design of Spider Web Bio-inspired Membrane Acoustic Metamaterials for Aircraft Cabin Walls
The internal noise in an aircraft cabin poses a significant threat to passengers as well as flight control and communication.Membrane Acoustic Metamaterials(MAM)exhibit excellent noise reduction properties while fulfilling lightweight requirements,meeting the aviation industry's dual requirements of noise reduction and weight control.Inspired by the spider web,this paper proposed a bio-inspired MAM design,which integrates a membrane,frame,and set of resonators.Computational and experimental results show that the bio-inspired model reduces the resonator mass by 19%and expands the noise reduction bandwidth by 61%.Furthermore,this paper investigated the influence of three design parameters(membrane shape,resonator position,and model size)on the structure's noise reduction performance and analyze its multi-level anti-resonance modes.The results suggest that the round model outperforms the other two square models in noise reduction performance.When the resonator position has a radius ratio of 0.54,it yields the best noise reduction performance.While the model maintains a considerable noise reduction effect when reduced in size,it may fail when the size increases.The free frame contributes to the formation of anti-resonance modes in the 2×2 array model,but has an opposite effect in the 3×3 array model.By adjusting the design parameters according to different frequency requirements,our design can adapt to the complex and changeable noise environment inside the aircraft.
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