Microperforated panel (MPP) absorbers are one of the most promising alternatives to porous
sound absorbing materials. However, these structures cannot achieve high and broadband …

This paper is concerned with the use of a perforated panel with extended tubes (PPET) to
improve the sound absorption confined to low frequencies. In comparison with a micro …

Based on multi-layer Helmholtz resonators with extended necks (HREN), a compact sound-
absorbing structure is developed for extra-broadband sound absorption. The structure of …

Conventional polyurethane foam has non-tunable sound absorption properties. Here, a
magneto-induced foam, called magnetorheological (MR) foam, was fabricated with the …

The diffuse sound absorption was investigated theoretically and experimentally for a
periodically arranged sound absorber composed of perforated plates with extended tubes …

Представлена математическая модель настройки многослойных звукопоглощающих
конструкций (ЗПК) на заданные частоты поглощения на основе опытных данных …

The paper considers a developed mathematical model of adjusting multi-layer sound-
absorbing structures in order to get the set absorption frequencies based on experimental …

This manuscript focuses on the acoustical behaviors and surface morphology of seashell
waste filler reinforced polyester (SFRP) coverings Anadara granosa Linn, Perna viridis Linn …

The intensity of sound in most industries and processes is a disturbing factor. Sound
absorbers are a means of reducing noise. There are various types of sound absorbers with …

This study focused on the use of coupled multi-degree of freedom Helmholtz resonator
inclusion for improving sound absorption of wooden sound diffuser element. Tubular shaped …