초록 ▼

In accordance with the present invention, there is provided a method of forming an acoustic attenuation chambers within a honeycomb core. The honeycomb core have a plurality of honeycomb cells having interconnected side walls. A plurality of septum layers are spaced from one another within the honey

In accordance with the present invention, there is provided a method of forming an acoustic attenuation chambers within a honeycomb core. The honeycomb core have a plurality of honeycomb cells having interconnected side walls. A plurality of septum layers are spaced from one another within the honeycomb cells to define acoustic attenuation chambers between the septum layers and the side walls of the honeycomb cells. Each of the septum layers have an associated ablating wavelength and is transparent to the ablating wavelengths of the other septum layers. A laser beam having a laser wavelength is directed towards the septum layers. The laser beam is selectively absorbed by a septum layer which has an associated ablating wavelength equal to the laser wavelength to ablate apertures therethrough without ablating other septum layers.

대표청구항 ▼

[ What is claimed is:] [1.] An acoustic attenuating structure comprising:a honeycomb core having a plurality of honeycomb cells; anda plurality of septum layers spaced apart from one another disposed within the honeycomb cells, each of the septum layers having acoustic apertures formed therethrough

[ What is claimed is:] [1.] An acoustic attenuating structure comprising:a honeycomb core having a plurality of honeycomb cells; anda plurality of septum layers spaced apart from one another disposed within the honeycomb cells, each of the septum layers having acoustic apertures formed therethrough and an associated ablating wavelength and being transparent to the ablating wavelengths of the other septum layers.