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Kai Ming Li School of Mechanical Engineering

Kai Ming Li School of Mechanical Engineering. Research in Environmental Acoustics Ray W. Herrick Laboratories. Current Research Areas. Physical Acoustics Propagation of sound waves Physical Phenomena: Diffraction, Reflection, Refraction, and Scattering

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Kai Ming Li School of Mechanical Engineering

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  1. Kai Ming LiSchool of Mechanical Engineering Research in Environmental Acoustics Ray W. Herrick Laboratories

  2. Current Research Areas • Physical Acoustics • Propagation of sound waves • Physical Phenomena: Diffraction, Reflection, Refraction, and Scattering • Propagation of sound in a complex urban and sub-urban environments • Environmental Noise • Innovation for sound absorption at low frequencies • Noise/Vibration interaction • Room Acoustics

  3. Methodologies • Analytical formulation – enhance understanding of the fundamentals • Numerical simulations • Ray tracing technique, Fast Field Program, Parabolic Equation, time-domain finite difference computations • Indoor scale model experiments • Outdoor full scale measurements

  4. No Treatment Diffuser Arrangement I Diffuser Arrangement II Selected Recent Results Comparisons of measured noise level attenuations in a “T” shape corridor with and without diffusers (QRD type). The plots show sound pressure level (SPL) reductions with referring to 1m free field levels in 1/3 octave bands of (a) 800 Hz, (b) 1000 Hz and (c) 1600 Hz.

  5. Future Directions • Detection of buried objects under outdoor ground surfaces • Optimal control of low-frequency noise by smart structures • Acoustical Characteristics of sound absorption materials • Monitoring of environmental noise • Human perception of low-frequency sound • Propagation of low-frequency sound and vibration in urban and suburban environments

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