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Cross Laminated Timber (CLT) panels typically consist of several glued layers of wooden boards with orthogonally alternating directions. This cross-laminating process allows CLT panels to be used as load-bearing plate elements similar to concrete slabs. However, they are very sound-reflective, which can lead to concerns about acoustics. Growing interest in applications of CLT panels as building materials in North America has initiated much current research on their acoustical properties. This project is aimed at investigating ways to improve the sound-absorption characteristics of the panels by integrating arrays of Helmholtz-resonator (HR) absorbers into the panels and establishing design guidelines for CLT-HR absorber panels for various room-acoustical applications. To design the new prototype panels, several efforts have been made to measure and analyze the sound-absorption characteristics of the exposed CLT surfaces in multiple buildings in British Columbia, investigate suitable methods and locations to measure both normal and random incidence sound absorption characteristics, study the current manufacturing method of CLT panels, create acoustic models of CLT-HR absorber panels with various shapes and dimensions, and evaluate the sound absorption performance of prototype panels. This paper will report progress on this work.

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During his more than 20 years of career as a professor at University of British Columbia, Murray Hodgson has inspired many of his previous students to pursue their career in various fields of acoustics, both in academia and industry. His undergraduate engineering course Acoustics and Noise Control was the first exposure to the vast world of acoustics for many of his former students. Furthermore, Murray has also supervised many students through their graduate studies. This paper will highlight Murray’s indirect contribution as a mentor by summarizing the current whereabouts of his former students who are now an active member of the acoustical community in North America and around the world.

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