Patent Application Titled "
No assignee for this patent application has been made.
Reporters obtained the following quote from the background information supplied by the inventors: "The present invention relates to the field of damping the vibrations of electronic equipment onboard aircraft, this equipment usually being referred to as 'avionics equipment.'
"Aircraft electronic equipment is generally mounted in an avionics rack module, and associated with an air duct used to cool it. This is notably the case of the electronic equipment that meets aeronautical standard ARINC600, an example of which is briefly described in document US-A-2012285665.
"Such equipment comprises a chassis, also referred to as a 'rack,' into which several electronic boards are plugged using slide rails provided on the boards and collaborating with guide rails forming a slideway with which the chassis is equipped. The latter is usually mounted on a chair in the avionics rack module, this chair supporting it mechanically and providing the electrical connection for the equipment to the aircraft electrical network.
"Such electronic equipment is exposed to the vibrations of the airplane. In order to reduce its sensitivity to vibrations, this equipment is usually stiffened, by fitting stiffeners, strengtheners or the like. For example, an electronic board may, in the peripheral part of its printed circuit, be equipped with a reinforcing surround aimed at reducing the deformations of this board under vibrational stress, notably in the critical zones which are sensitive to deformations and to relative movement between components. Such a reinforcing surround ensures that the first natural frequencies of the board are high enough to limit the sensitivity of the board to lower-frequency vibrational stresses.
"Nevertheless, there is a need to improve the vibration resistance of avionics equipment still further."
In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "In order to address this series of problems, the subject matter of the invention is an electronic board for avionics equipment, the board comprising a printed circuit, a reinforcing surround and board retention means, and further comprises vibration damping means interposed between the reinforcing surround and the retention means.
"The invention thus proposes to perform mechanical vibration damping directly at the interface between the reinforcing surround and the board retention means, the latter holding the board in the avionics equipment. In this way, the invention makes it possible significantly to reduce the accelerations/vibrations that can be transmitted to the board by the means of the equipment that support this board. As a result, the mechanical resistance of the components of the electronic board is enhanced and their reliability improved.
"For preference, the invention comprises at least one of the following optional features, considered in isolation or in combination.
"The said damping means take the form of at least one coating of vibration damping material. Alternatively, they may be mechanical means providing such a vibration damping function.
"The said vibration damping material is a polymer material.
"The said vibration damping material has a density, in the neutral state, of between 0.8 and 1.8 and is compressed between the reinforcing surround and the retention means with a compression ratio of the order of 15 to 25%.
"The said reinforcing surround comprises an outwardly projecting flange, on either side of which first and second vibration damping means are pressed.
"The said retention means comprise two mechanical components mounted one on the other and clamping the said flange and the first and second vibration damping means.
"The said retention means additionally comprise a locking piece intended to lock the board in complementary retention means belonging to the avionics equipment, the said locking piece being attached to one and/or the other of the said two mechanical components.
"The board comprises two retention means arranged respectively on two opposite sides of the reinforcing surround.
"The said retention means adopt the overall form of a rail, preferably a slide rail so that the board can be plugged into the equipment by sliding.
"The board also comprises electronic components connected to the printed circuit, and a board connector.
"Another subject of the invention is an item of avionics equipment comprising a chassis equipped with complementary retention means, the said equipment also comprising at least one electronic board as described hereinabove, the said board being housed in the chassis by collaboration between its retention means and the said complementary retention means.
"For preference, the chassis has an opening opposite a chassis backplane, the opening being delimited in part by two opposite walls each one extending as far as the chassis backplane, each electronic board having two retention means respectively collaborating with two complementary retention means provided on the two opposite walls.
"For preference, the retention means and the complementary retention means are designed to slide on one another in a plug-in direction of the board into the said chassis, the retention means preferably adopting the overall form of a slide rail, male or female, and the complementary retention means preferably adopting the form of a guide rail guiding the slide rail. Nevertheless, solutions other than rails are conceivable for plugging in the board by sliding, without departing from the scope of the invention. For example, the complementary retention means of the chassis could adopt the form of several discrete guide elements spaced apart in the plug-in direction.
"For preference, the chassis backplane is equipped with at least one connector collaborating with an electronic board of the equipment. That allows the board to be plugged into the said connector of the chassis backplane.
"Another subject of the invention is an avionics rack module comprising at least one item of electronic equipment as mentioned hereinabove, and a cooling air duct running along each item of electronic equipment, the latter preferably being mounted on a support chair.
"Finally, a subject of the invention is an aircraft comprising at least one such avionics rack module.
"Other advantages and features of the invention will become apparent from the nonlimiting detailed description below.
BRIEF DESCRIPTION OF THE DRAWINGS
"This description will be given with reference to the attached drawings among which:
"FIG. 1 depicts a schematic side view of part of an avionics rack module according to one preferred embodiment of the invention;
"FIG. 2 depicts a perspective view of the avionics rack module shown in the preceding figure, without the electronic equipment;
"FIGS. 3 and 4 depict perspective views of the avionics rack module shown in the preceding figures, from two distinct viewpoints;
"FIG. 5 depicts a perspective view of a part of the electronic equipment of the rack module depicted in the preceding figures, with just one electronic board fitted into the chassis;
"FIG. 6 is a cleaned-up view of FIG. 5, showing the electronic board in greater detail;
"FIG. 7 depicts an exploded perspective view of a part of the electronic board shown in the preceding figure, without its printed circuit;
"FIG. 8 depicts a view in cross section of the electronic board shown in FIGS. 6 and 7; and
"FIGS. 9 and 10 show views similar to that of FIG. 7, according to alternative forms of embodiment."
For more information, see this patent application: Rebeyrotte, Vincent; Carcone, Jonathan.
Keywords for this news article include: Patents.
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