INNOVATIVE EXPERIMENTS ON A VENTILATED SOUND-ABSORBING META-MATERIAL BASED ON HELMHOLTZ RESONATOR

The college physics experiment educational campaigns can surround the research solutions on ventilated sound-absorbing meta-materials, which are in the spotlight of ventilation and noise-reduction issue recently. The research plan uses the finite element simulation software COMSOL Multiphysics for theoretical modeling and calculation, and optimizes the design of ventilating and sound-absorbing metamaterials based on imperfect Helmholtz resonators. By adjusting the structural parameters, the meta-material can achieve broadband absorption within low-frequency noise. The metamaterial structures are printed using 3D printing technology, and the acoustic performance of the metamaterials is quantitatively measured using an experimental setup that breaks through the “black box” approach. Integrating cutting-edge and hot topics into university physics experimental teaching, simulating and recreating the scientific research process, enhances the higher-order nature, innovation, and challenge of the experiments. The teaching model of “group independent exploration-defense report” is adopted to comprehensively enhance students’ “5C” core competencies.