Seminar

Abstract: Low-frequency and broadband noise control remains a persistent and critical technological challenge in major engineering systems, including large-scale wind tunnels and aero-engine facilities. Under the combined constraints of lightweight design and high-performance requirements, achieving stable and efficient noise suppression through structural innovation has become a key frontier in both fundamental acoustics and advanced engineering applications. In recent years, acoustic metamaterials have attracted growing interest in noise control owing to their exceptional design flexibility and their capability to precisely tailor the phase and amplitude of acoustic waves. Building on more than a decade of systematic research efforts by our group, this report presents the design principles and regulation strategies of ultra-broadband acoustic metamaterial absorbers, with an emphasis on the underlying physical mechanisms and methodological approaches for extending the effective absorption bandwidth. Furthermore, experimental validations under complex and realistic environmental conditions are introduced, together with explorations of representative application scenarios relevant to large-scale engineering noise control. Biography: Professor Yong Li is a tenured Professor at Tongji University, where he serves as Deputy Director of the Institute of Acoustics, Associate Editor of the Journal of the Acoustical Society of America (JASA), and a member of the Editorial Advisory Board of APS Open Science. He received his PhD in Acoustics from Nanjing University in 2013 and subsequently conducted postdoctoral research at the Hong Kong University of Science and Technology and Université de Lorraine, France, before joining the Institute of Acoustics at Tongji University in late 2016. His research focuses on the theory of acoustic metamaterials and the development of metamaterial-enabled noise control systems for large-scale engineering equipment. As (co-)first or corresponding author, he has published more than 110 papers in leading international journals, including Physical Review Letters, National Science Review, Science Advances, and Nature Communications, receiving over 13,000 citations with an H-index of 52. He has been repeatedly recognized as a Highly Cited Chinese Researcher and listed among the world’s top 2% scientists based on career-long impact. His honors include the First Prize of the Ministry of Education Natural Science Award and the Wei Mo’an Acoustics Award of the Acoustical Society of Shanghai. Patents on acoustic metamaterial absorbers developed by his group have been successfully transferred to industry and implemented in national large-scale wind tunnel compressor noise reduction systems, contributing to the low-noise operation of major engineering facilities. ALL INTERESTED ARE WELCOME