Aircraft interior trim panel, and aircraft fitted with such panels
A trim panel for the interior of an aircraft, the panel having a multilayer structure and including an outer layer made of material impervious to air, and which is positioned in use facing the fuselage of the aircraft; an inner layer made of trim material, and which in use defines the interior; a structural layer interposed between the inner and outer layer; and acoustic energy dissipating material, also interposed between the inner and outer layer; the inner layer being made of porous material allowing airflow towards the acoustic energy dissipating material.
1. A trim panel ( 10 ) for the interior ( 11 ) of an aircraft (E), the panel having a multilayer structure and comprising:
an outer layer ( 12 ) made of material impervious to air, and which is positioned in use facing the fuselage of said aircraft (E);
an inner layer ( 13 ) made of trim material, and which in use defines said interior ( 11 );
a structural layer ( 14 ) interposed between said inner and outer layer ( 13 , 12 ) and comprising a number of adjacent cells ( 15 ) defining respective air passages ( 16 ); and
acoustic energy dissipating material ( 17 , 21 ), also interposed between said inner ( 13 ) and outer ( 12 ) layer;
said inner layer ( 13 ) being made of porous material allowing airflow towards said acoustic energy dissipating material ( 17 , 21 );
characterized in that said cells ( 15 ) are partly filled with said acoustic energy dissipating material ( 21 ), wherein said acoustic energy dissipating material forms a further layer ( 17 ) interposed between said structural layer ( 14 ) and said inner layer ( 13 ), wherein an air gap is provided in each of said cells ( 15 ) of said structural layer ( 14 ) between said further layer ( 17 ) and said acoustic energy dissipating material ( 21 ) located in said cells ( 15 ), and wherein said panel comprises, between said structural layer ( 14 ) and said further layer ( 17 ), an intermediate layer ( 18 ), which is made of the same material as said outer layer ( 12 ) and is in the form of a grille with through openings ( 20 ), wherein said acoustic energy dissipating material ( 17 , 21 ) is foam.
2. A panel as claimed in claim 1 , wherein said acoustic energy dissipating material ( 21 ) fills each of said cells ( 15 ) two thirds full.
3. A panel as claimed in claim 1 , wherein said further layer ( 17 ) is made of open-cell foam.
4. An aircraft comprising:
an interior ( 11 ) defined by at least one trim panel ( 10 ), wherein the trim panel has a multilayer structure comprising:
an outer layer ( 12 ) made of material impervious to air, and which is positioned in use facing the fuselage of said aircraft (E);
an inner layer ( 13 ) made of trim material, and which in use defines said interior ( 11 );
a structural layer ( 14 ) interposed between said inner and outer layer ( 13 , 12 ) and comprising a number of adjacent cells ( 15 ) defining respective air passages ( 16 ); and
acoustic energy dissipating material ( 17 , 21 ), also interposed between said inner ( 13 ) and outer ( 12 ) layer;
said inner layer ( 13 ) being made of porous material allowing airflow towards said acoustic energy dissipating material ( 17 , 21 );
characterized in that said cells ( 15 ) are partly filled with said acoustic energy dissipating material ( 21 ), wherein said acoustic energy dissipating material forms a further layer ( 17 ) interposed between said structural layer ( 14 ) and said inner layer ( 13 ), wherein an air gap is provided in each of said cells ( 15 ) of said structural layer ( 14 ) between said further layer ( 17 ) and said acoustic energy dissipating material ( 21 ) located in said cells ( 15 ), and wherein said panel comprises, between said structural layer ( 14 ) and said further layer ( 17 ), an intermediate layer ( 18 ), which is made of the same material as said outer layer ( 12 ) and is in the form of a grille with through openings ( 20 ), wherein said acoustic energy dissipating material ( 17 , 21 ) is foam.