Acoustic metasurfaces represent a cutting-edge research area in functional acoustic materials. This paper introduces the acoustic metasurface—Decorated Air-proof Window (DAW)—based on practical needs, and designs the research and development of DAW as an investigative experiment. The experiment employs theoretical derivation and finite element simulation software COMSOL Multiphysics for theoretical analysis and design of the DAW and its metal retention device. It encompasses a wide range of experimental components, including COMSOL modeling and analysis, design of the retention device, and measurement of the DAW's transmission performance. Introducing the investigative experiment on DAW into university physics lab teaching enhances the advanced nature, innovation, and challenge level of the experiment. This approach is conducive to nurturing top innovative talents in new materials and lays a solid foundation for improving students' innovative abilities.

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.

As the training quality of the undergraduates is directly determined by the course quality. To enhance the teaching quality of courses, the Physics Experiment Center of Chongqing University has transformed the teaching model of university physics experiments. The traditional flipped classroom model is not quite suitable for the domestic students considering their learn situation, and it is difficult to achieve the teaching expectation. The independent experiments are also too challenging for the students. This paper adopts a new teaching model with mixed methods of semi-flipped classroom, semi-independent design and summary report. The practice of this model shows that it can improve students' ability such as self-learning, independent innovation and teamwork collaboration. Furthermore, it benefits the continuous improvement of subsequent teaching practice.

The online and offline hybrid teaching mode has gradually emerged in recent years but without fully analyze the knowledge structure of students using the data. To improve this shortage, the teaching reform group selects online and offline education resources to obtain students' knowledge structure based on the OBE concept and in combination with the KETANGPAI online classroom management platform and reversely help teachers design the offline teaching scenarios.By teaching through this OBE oriented online and offline combined teaching mode, the crucial needs of students can be fulfilled while the learning interest mobilized and the teaching quality is improved. All the advantage mentioned above has be validated by the educational practice and the scores of students' final examination.