| 摘要 |
<p>A noise attenuation panel (10) comprises a cellular component (12) which has wall portions which provide bounding surfaces for a multiplicity of cells (15) which extend from the front face to the rear face of the component (12). In each cell (15) in a region where the wall portions are continuous a cell dividing septum element (14) is provided which extends across the cell (15) and which is secured at a predetermined position in the cell (15) to the wall portions of the cell (15) to divide the cell into two subcells (151, 152). The panel is manufactured by forming the cellular component (12) without the cell dividing septum elements, bringing a septum sheet into engagement with the cellular component (12) such that the edges of the wall portions at a face of the cellular component cut through the septum sheet to form a multiplicity of cell dividing septum elements (14) and causing each cell dividing septum element (14) to advance in the cell to a position at which it is secured to the wall portions of the cell.</p> |
