An ultra-low-frequency sound absorber and its application in noise reduction in ducts
Source abstract
Abstract
We demonstrate, both numerically and experimentally, an ultra-low-frequency sound absorber and its application in silenced ducts. The absorber comprises an array of resonant dual-spiral channel units (with a thickness of λ/47) backed by a wall, achieving near-perfect sound absorption with a fractional bandwidth of 18.3% around 73 Hz—a hallmark of ultra-low-frequency sound absorption. This characteristic arises from its effective near-zero modulus, with the absorbed energy dissipated through viscous losses in the unit channels. Furthermore, we explore the application of this ultra-low-frequency absorber in silenced ducts. By designing a composite absorber of five units with different parameters, we experimentally demonstrate efficient sound absorption in a duct with an enhanced fractional bandwidth of 60.6%. The average absorptance approaches 0.87. This designed absorber offers the advantages of deep-subwavelength thickness, ultra-low-frequency sound absorption, and broad bandwidth, opening up new possibilities for metamaterial-based absorbers in practical applications.
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Research context
OpenAlex topics: Acoustic Wave Phenomena Research · Noise Effects and Management · Aerodynamics and Acoustics in Jet Flows
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Research Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University 1 , Zhenjiang 212013, China
State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences 2 , Beijing 100190, China
National Laboratory of Solid State Microstructures, Department of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University 3 , Nanjing 210093, China
Funding
National Natural Science Foundation of China · National Key Research and Development Program of China · Research Project of State Key Laboratory of Mechanical System and Vibration
References (51)
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