▎ 摘　　要

NOVELTY - An active responsive multi-scale sound absorbing material comprises a shape memory polymer panel comprising open cells, porous polymer foam located inside the open cell and bond to the cell wall of the open cell, and a nanofiber mat layer located on one surface of the panel and bond to each of the panel and the polymer foam. USE - Active responsive multi-scale sound absorbing material used in machine e.g. engine and turbine of vehicle and heavy construction equipment. ADVANTAGE - The active responsive multi-scale sound absorbing material has improved sound absorption performance in a wide frequency and actively adjusting the sound absorption frequency. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of the active responsive multi-scale sound absorbing material, which involves (a) preparing the shape memory polymer panel including open cells, (b) giving a variable shape to the panel, (c) filling porous polymer foam inside the open cells, and (d) forming the nanofiber mat layer on one surface of the panel filled with the polymer foam.