Method for repairing a sound attenuation panel
A technology of sound attenuating plate and sound resistance, applied in aircraft maintenance, sound-producing equipment, thin plate connection, etc., can solve the problems of loss of sound absorption, difficult assembly or repair operation, and affecting surface characteristics.
Inactive Publication Date: 2013-10-16
AIRCELLE
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- Application Information
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Problems solved by technology
[0015] This approach is costly
[0016] In addition, the associated assembly or repair operations are not particularly easy, since there is a risk that the acoustic and structural quality of the panel will be affected by these operations, such as a reduction in the mechanical strength of the sandwich panel or even loss of the panel Sound-absorbing function
[0017] At the same time, assembly and repair operations such as welding or brazing have an influence on the metallurgical properties of the plate being processed and thus on its surface properties
[0018] Thus, repair operations may lead to defects such as oxidation or cracks
[0019] Difficult to eliminate when these defects are located on the inside of the board
Method used
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[0052] from figure 1 As can be seen in the figure, the sound attenuating panel 100 is suitable for repair using the method of the present invention and, on the side opposite to the acoustic excitation source, the sound attenuating panel 100 includes a structural skin 120 formed of sheet metal.
[0053] Added to said structural skin 120 is a cellular structure 130 of the honeycomb type, known as a sound-absorbing material.
[0054] An acoustically resistive layer 110 formed of perforated sheet metal or wire mesh, or a combination of these two elements, may be attached to the honeycomb structure 130 to encapsulate the honeycomb structure 130 between the acoustically resistive layer and the structural skin 120 between.
[0055] In one non-limiting example, the perforations have an inner diameter of less than 1.5 mm.
[0056] The honeycomb structure 130 may be fixed to the structural skin 120 and the acoustic resistance layer 110 using a brazing or welding process.
[0057] Thi...
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A gas shielding device used during a welding step in a controlled atmosphere of a sound attenuation panel includes an inert gas injector to inject inert gas onto the panel and a housing to receive a welding torch. The inert gas injector comprises an inert gas diffuser mounted on the periphery of the housing for receiving the welding torch.
Description
technical field [0001] The invention relates to a method of manufacturing sound-attenuating panels, especially for aeronautics, and to a device for carrying out said method. Background technique [0002] The use of sound attenuating panels, for example in aircraft nacelles and nacelle components equipped with said panels, to reduce the noise emitted from turbojet engines is well known in the art. [0003] Such sound attenuating panels generally have a sandwich structure comprising a structural skin, a cell structure in the form of a honeycomb, and an acoustically resistive layer, usually formed by a perforated acoustic skin. [0004] In some cases, the sound-attenuating panels must be designed to be installed in the hot zone of the nacelle of an aircraft turbojet engine, in particular in the downstream part of the nacelle, through which the temperature of the exhaust gases exiting is usually higher than 600°C. [0005] The use of sound-attenuating panels in this exhaust are...
Claims
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IPC IPC(8): B23P6/00B64F5/00B29C73/06B23K9/16B32B43/00
CPCB23K35/38B23P6/005B23K2201/006B23K9/325B29L2024/00B32B43/00B23P6/00B23K2201/02G10K11/16B23K26/20B29L2031/608F16B5/01Y02T50/672B29C73/06B23K9/164B32B7/08B23K2203/08B32B2307/102B64D7/02F01D5/005B23K26/147B32B2311/00B29L2031/3082B64D29/00B23K35/383B23K9/16B64F5/0081B23K2203/14F05B2230/80F16B5/08F02C7/045B23K26/123F02C7/24B32B2305/024B32B15/04B32B2250/40B32B2605/18B23K26/21B64F5/40B23K2103/26Y10T29/4957Y10T29/49618Y10T29/49718B23K2101/02B23K2101/006B23K2103/08B23K2103/14Y02T50/60
Inventor 皮埃尔·科蒙尼古拉斯·赫尔夫让-克劳德·里沃阿尔
Owner AIRCELLE