Abstract
In his life-long career pursuing, Prof. Dah-You Maa contributed greatly in many areas of acoustics, not only in acoustical research and development, but also in the promotion of acoustical education, application and legislation. Prof. Maa presented a simplified method for calculation of normal modes for room acoustics, invented micro-perforated panel absorbers and micro-perforation jet mufflers, gave a formula of jet noise power via air pressure, and acoustically designed the first and biggest Congress Hall, built the first set of acoustical laboratories, established the acoustical standard system in China. He also supervised tens of postgraduate students working in environmental acoustics, building acoustics, speech signal processing, nonlinear acoustics, and active noise control. In this paper, the main contribution of Prof. Maa is introduced. Several of his typical research works, such as normal mode distribution in room acoustics and micro-perforated panel absorbers, are explained in detail, from which we can well appreciate the physical insights and theoretical skills of Prof. Maa.
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