Sensitivity analysis and non linear parameters estimation of porous materials from normal sound coefficient absorption measurements

Rapid estimation of sunflower leaf area from linear measurements

on the effect of linear & non-linear texts on students comprehension and recalling

چکیده ندارد.

Design and Compare Sound Absorption Coefficient Nanocomposites Containing Tea Waste and Polypropylene With and Without Nanoclay

Introduction: In recent years tend to use of natural fibers has increased in making sound absorbers. Fiber-based natural materials have low density, low production costs, and are biodegradable. Material and Methods: In this study, the effect of nanoclay and the behavior of the nanocomposite specimens containing tea waste, polypropylene, and nanoclay in the sound absorption coefficient are inve...

An alternative coefficient for sound absorption

The acoustic absorption coefficient is a number that indicates which fraction of the incident acoustic power impinging on a surface is being absorbed. The incident acoustic power is obtained by spatial integration of the incident intensity, which is (classically) defined as the time-averaged intensity associated with the incident sound field. The measurement of the effective, in situ, sound abs...

Measurement of the absorption coefficient of sound absorbing materials under a synthesized diffuse acoustic field.

This letter proposes an experimental method to estimate the absorption coefficient of sound absorbing materials under a synthesized diffuse acoustic field in free-field conditions. Comparisons are made between experiments conducted with this approach, the standard reverberant room method, and numerical simulations using the transfer matrix method. With a simple experimental setup and smaller sa...