Mechanical Engineering Commons^™

Utilization Of Empirical Models To Determine The Bulk Properties Of Compressed Sound Absorptive Materials, Ruimeng Wu

Theses and Dissertations--Mechanical Engineering

Empirical models based on flow resistivity are commonly used to determine the bulk properties of porous sound absorbing materials. The bulk properties include the complex wavenumber and complex characteristic impedance which can be used directly in simulation models. Moreover, the bulk properties can also be utilized to determine the normal incidence sound absorption and specific acoustic impedance for sound absorbing materials of any thickness and for design of layered materials. The sound absorption coefficient of sound absorbing materials is measured in an impedance tube using wave decomposition and the measured data is used to determine the flow resistivity of the …