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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
Kai Ming LiSchool of Mechanical Engineering

Research in Environmental Acoustics

Ray W. Herrick Laboratories


Current research areas
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


Methodologies
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


Selected recent results

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.


Future directions
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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