Design and Simulation of Acoustic Metamaterials for Noise Reduction in Open- Flow Systems

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dc.contributor.authorJi, Chenya
dc.contributor.authorReddy, Prajwal Sunil
dc.contributor.departmentChalmers tekniska högskola / Institutionen för mekanik och maritima vetenskapersv
dc.contributor.departmentChalmers University of Technology / Department of Mechanics and Maritime Sciencesen
dc.contributor.examinerYao, Huadong
dc.contributor.supervisorYao, Huadong
dc.contributor.supervisorNa, Wei
dc.contributor.supervisorKeulemans Westlin, Christina
dc.date.accessioned2024-11-18T13:25:12Z
dc.date.available2024-11-18T13:25:12Z
dc.date.issued2024
dc.date.submitted
dc.description.abstractThe growing demand for larger and more efficient cooling systems in heavy-duty trucks has led to increased noise levels, particularly from cooling fans, which poses challenges to both environmental standards and user comfort. Conventional techniques for sound absorption typically restrict particle motion, which will also impede flow and increase temperature in a situation when fans are present. Acoustic metamaterial (AMM) solutions have been explored to address these problems. A systematic methodology for designing a single metamaterial cell is presented, encompassing four stages: specification of geometrical parameters, parametrization, parametric design, and optimization. Noise characterization of a vehicle’s cooling fan, based on Lu’s study[20], revealed broadband noise and tonal harmonics centred on the blade passing frequency (BPF). In response, a double-layer micro-perforated panel (DLMPP) structure was designed to reduce noise over a broad frequency range; a space-coiling structure was created to target specific tonal noise. Theoretical calculations show that both structures have excellent noise absorption performance. Simulations of the space-coiling cell with a flow field were then conducted. Although the absorption coefficients show slight deviations from theoretical calculations, the results remain promising for this study and warrant further investigation. A simulation of an under-cab environment was also studied by applying the acoustic impedance of DLMPP on target surfaces under conditions with and without flow. The results demonstrate that the present AMMs can significantly reduce cooling fan noise while maintaining thermal management efficiency.
dc.identifier.coursecodeMMSX30
dc.identifier.urihttp://hdl.handle.net/20.500.12380/308994
dc.language.isoeng
dc.setspec.uppsokTechnology
dc.subjectcooling fan noise
dc.subjectacoustic metamaterial design
dc.subjectacoustics metamaterial simulation
dc.subjectbroadband noise reduction
dc.subjecttonal noise reduction
dc.subjectcomputational fluid dynamics
dc.subjectpassive noise control
dc.subjectaeroacoustics
dc.subjectmicro-perforated panel
dc.subjectspace-coiling structure
dc.titleDesign and Simulation of Acoustic Metamaterials for Noise Reduction in Open- Flow Systems
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster's Thesisen
dc.type.uppsokH
local.programmeApplied mechanics (MPAME), MSc
local.programmeSound and vibration (MPSOV), MSc
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