Honeycomb structure, particularly for absorbing sound and its production process
AssigneeHispano Suiza Aerostructures
InventorsPatrick Gonidec, Jean Adam Roger Treger
Life of this patent
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Abstract
A conventional honeycomb structure is strengthened by intermediate membranes (13), which compartmentalize the cells (5) in the height-wise direction. Such a structure more particularly has an increased mechanical strength and high damping properties for Helmholtz resonators intended to trap sound waves arriving on the structure by a perforated face (1).
Claims41
A process for making a honeycomb structure including membranes dividing cells of the structure, comprising the steps of:
- a) superimposing main sheets for defining the cells and superimposing lengthwise folded intermediate sheets with said main sheets;
- b) adhesively joining each of said main sheets to two adjacent ones of said main sheets at joining portions that are to become straight edges of the cells, and which are separated by free portions that are to become oblique edges of the cells, and adhesively joining portions of said intermediate sheets to straight edges of two adjacent ones of said main sheets with said joining portions separated by free portions;
- and
- c) opening the structure by pulling the main sheets apart, and creating the cells of the structure divided by said membranes by unfolding said free portions of said intermediate sheets.
A process for making a structure configured to dampen sound waves, including membranes dividing cells of the structure, comprising the steps of:
- a) inserting a folded intermediate sheet having two lip portions separated by a fold between two main sheets used to define the cells, the main sheets each comprising at least four connected faces including a first face connected to a second face connected to a third face connected to a fourth face;
- b) adhesively joining the first faces of the main sheets to two adjoining lip portions of the intermediate sheet;
- c) adhesively joining the third faces of the main sheets to corresponding faces of the intermediate sheet;
- and
- d) separating the third faces main sheets from each other and creating the cells by at least partially unfolding portions of the intermediate sheet extending into the cells forming the membranes.
A structure configured to dampen sound waves, comprising:
- a plurality of main sheets, the main sheets comprising at least four connected faces including a first face connected to a second face connected to a third face connected to a fourth face, the first faces of two of the main sheets being adhesively joined;
- at least one intermediate sheet disposed between said two main sheets and being adhesively connected to the first and third faces of the main sheets, the at least one intermediate sheet extending into a cell formed by the main sheets, and forming a broken fold membrane sub-dividing the cell into multiple compartments.
A structure configured to dampen sound waves, comprising:
- a plurality of main sheets, the main sheets comprising at least four connected faces including a first face connected to a second face connected to a third face connected to a fourth face, the first faces of two of the main sheets being adhesively joined, and the third faces of the two of the main sheets being separated from each other, at least the second, third, and fourth faces of the two of the main sheets forming a cell;
- at least one intermediate sheet between the two of the main sheets, each intermediate sheet comprising two sections, each of the two sections comprising a trapezium portion having a large base and a small base, and a rectangle portion, the two sections being joined at the large bases of each trapezium, and the rectangle of each section being joined to the small base of each of the trapezium, the at least one intermediate sheet extending into the cell and at least one of the rectangles of the at least one intermediate sheet adhesively joined to the first faces of the two of the main sheets.
Dependencies are inferred from the claim text.