aircraft pressure bulkhead

These relatively small aircraft might be designed to carry from four to six passengers (in addition to the air crew). A bulkhead assembly adapted to be mounted in an aircraft fuselage comprising: a relatively flat bulkhead web corresponding to a cross sectional shape of the fuselage, said bulkhead web having a first surface facing a pressurized compartment and a second surface opposite the first surface; a reinforcing structure attached to the second surface of the bulkhead web, the reinforcing structure including: primary beam members each having a beam web that interconnects a first flange and a second flange, said first flange engaging the second surface of the bulkhead web; secondary beam members intersecting the primary beam members, said secondary beam members being discontinuous and having inner secondary beam members and outer secondary beam members, each of said inner and outer secondary beam members including a beam web that interconnects a first flange and a second flange, said first flange of said inner and outer beam members engaging said bulkhead web second surface; and, a plurality of connecting elements attached to the second beam flanges. 1 A-1 B, there is shown a pressure bulkhead assembly 10 embodying the invention and adapted Increasing commercial aircraft deliveries to support rising passenger and freight traffic, introduction of fuel-efficient next-generation aircraft, and rising commercial aircraft fleet size across regions are the key factors propelling the demand for pressure bulkheads in the segment.Based on the material type, the is segmented as Metal Pressure Bulkheads and Composite Pressure Bulkheads. (See Figs. The primary beam members are relatively elongated and have first and second ends that are each attached to the fuselage skin. A method of making a bulkhead assembly for use in an aircraft fuselage, comprising the steps of: molding a fiber reinforced composite material to form a bulkhead web, primary beam members, secondary beam members, and connecting elements, attaching the primary beam members and the secondary beam members to one another with mechanical fasteners to form a subassembly, placing the bulkhead web on a first side of the subassembly and the connecting elements on a second side of the subassembly to provide a preliminary bulkhead assembly, and bonding the bulkhead web, the subassembly, and the connecting elements to one another. The method used to install the pressure bulkhead in the fuselage must be effective to seal against air leakage and to assure maximum strength. [0029] The beam web 26 of each inner beam members 16a has end portions 29 that extend outwardly past the ends of the first and second flanges 27, 28. METHOD FOR REALIZING SEAL JUNCTION BETWEEN AIRCRAFT PARTS, Aircraft having a recessed cavity in an aft pressure bulkhead wall surface and a galley moved rearwardly into the recessed cavity increasing floor space in front of the galley, Aircraft troncon comprising a pressurization partition, Pressure frame designed in particular for an aircraft, Composite structural member having an undulating web and method for forming the same, Structure of fiber-reinforced composite material and manufacturing method thereof, Monolithic structure with redundant load paths, Structural component, in particular for an aircraft and method for producing a structural component, Aircraft partition for separating a cargo portion from a cockpit or a passenger compartment, Deformable forward pressure bulkhead for an aircraft, Composite internal beam for strengthening the structure of an aircraft, Fiber-reinforced composite member and method for producing structure using same, Power stress boxes and methods to obtain them, Aircraft wing flap device and method of operating the same, Pressure bulkhead made of composite material for an aircraft, Vented cell structure and fabrication method, Frame element, aircraft air-conditioning system and method for the installation of a frame element in an aircraft, Aircraft cabin floor structures, systems and methods, Aircraft or spaceship structural component with heat-insulating foam layer, Pressure board, in particular for aircraft, Aircraft wing composed of composite and metal panels, Apparatus and methods for joining composite structures of aircrafts, Pressure bulkhead for an aerospace fuselage, Aircraft interior panel with acoustic materials, Device for spreading a bowl in an airplane pump, Pressure fuselage of an aircraft with dome-shaped pressure bulkhead, Device for fixing a lightweight panel on a support, Ep: the epo has been informed by wipo that ep was designated in this application, Wipo information: entry into national phase. Photo Credit: German Aerospace Center (DLR) â¦ The bulkhead assembly as defined in claim 3, wherein the outer secondary beam members extend between, and are attached to, the fuselage skin and one of the primary beam members. [0035] In addition to the bulkhead structure defined above, the invention provides an improved method of assembly. 2A, 2B, and 4. As such, the connecting strips interconnect inner and outer beam members of one of the secondary beam members, and serve as a supplemental flange structure to help strengthen the secondary beam members. © 2021 GlobeNewswire, Inc. All Rights Reserved. But now, composites are also gaining the traction in the forward location.Based on the shape type, the market is segmented as Flat-shaped Bulkheads and Curved-Shaped bulkheads. However, tier players also produce front pressure bulkheads. The bulkheads must have sufficient strength and rigidity to resist the pressure differential load at altitude. As a result of this invention, more cabin space has been made available. At the same time, the bulkhead assembly 10 has a low height with respect to its dimension along the axis of the fuselage 11. The multiple beams, which serve as a reinforcing structure, are attached to the second surface of the flat web. [0004] The shape of a fuselage is generally tubular with a cross section that may be circular or oval, for example. 3. than the similar-sized metallic bulkheads. Ref document number: 5. Then, the inner secondary beam members 16a are attached to adjacent primary beam members 15 and For one particular size of fuselage, the height dimension of the bulkhead assembly 10 is about 100 mm, The bulkhead web has a first side facing the pressurized compartment and a second side opposite the first side. [0033] With the aforementioned structure, the bulkhead assembly 10 has excellent beam strength in both the direction of the primary beam members 15 and the secondary beam members 16. 1A - 4 are replaced with a single component. Low cost is another key countable factor for its preference over composite pressure bulkheads.Composite pressure bulkhead is projected to remain the faster-growing segment during the forecast period. It helps maintain pressure when stratocruising and protects the aircraft from bursting due to the higher internal pressure. A rear pressure bulkhead with all stiffening members is considered in this analysis. Similarly, mounting flanges at the outer ends of the outer secondary beam members 16b and the free ends of the primary beam members 15 may be attached to the fuselage skin 11 by adhesive bonding and/or mechanical fasteners. The market has experienced a remarkable transition over a period of time, especially in terms of design, material, and size among which composite pressure bulkhead is in limelight. As is known to those skilled in the art, the bulkhead web rim 12a may be attached to the fuselage inner wall by adhesive bonding and/or mechanical fasteners. [0034] An alternate form of the invention is shown in Figs. Frames and bulkhead are located inside the fuselage. The distance between the flanges 22, 23 should be as small as possible but yet sufficient to provide adequate beam strength. The method is best described with respect to Fig. The full-scale demonstrator of a pressure bulkhead for an A320 aircraft, exhibited at the ILA, consisted of eight segments of equal size. The main aim is to reduce the reduce the weight of the bulkhead. The height of the aft bulkhead is especially important in the case of small aircraft wherein cabin space is at a premium. [0025] The bulkhead assembly 10 includes a relatively thin bulkhead web or skin. t Double ended receptacles t Cabin junction with: - Wing - Rear aft pressure bulkhead - Landing gear bay Between Aircraft compartments Vehicle junctions For use with MIL-DTL-38999 Sill Plugs Extensive range Benefits Pressure delta up to 1 bar Thermoplastic insulator Features Aluminium or stainless steel housing Male â¦ The reinforcing structure 13 includes a plurality of beams 15, 16, and a series of connecting strips 35. Pressure bulkhead of an aircraft is an essential component that covers the front and rear end of a fuselage. 1 B, 2A, 2B, and 4). AVIC SAC Commercial Aircraft Company Ltd. 2A, which shows the primary components of the bulkhead in an unassembled form. In addition, in order to maximize the usable space in the cabin compartment, the height of the bulkhead assembly should be minimized. A pressure bulkhead assembly adapted for installation in an aircraft fuselage includes a bulkhead web and a reinforcing structure. The bulkhead web 12 may be initially attached to the reinforcing structure 13 by cleco fasteners, and may be subsequently permanently attached with adhesive bonding (i.e., thermal or heat bonding) and permanent mechanical fasteners (e.g., Hi-Lite fasteners) to form the bulkhead assembly 10. 5 is a plan view according to another exemplary embodiment showing a connecting member according to another exemplary embodiment of the invention; and. Bulkhead Feedthrough Connectors are the perfect solution for ensuring electrical performance is maintained, especially in high pressure environments where sealing requirements are paramount. Sign up today for your free Reader Account! [0036] As a first step, the bulkhead web 12, primary beam members 15, inner and outer secondary beam members 16a, 16b, and the connecting strip 35 are formed in respective molds to produce fiber reinforced composite components. to be attached to the inner wall surface of the fuselage skin 11 of an aircraft. tsb-bst.gc.ca. EP, Kind code of ref document: extensive post-crash fire destroyed the remaining aircraft structure [...] forward of the aft pressure bulkhead (see Photo 1). It seals the passenger section, where the air pressure is far higher than outside, off from the tail section. Our inventory contains more than 2 billion new and after-market parts applicable within the aerospace and defense industries. Metal pressure bulkheads, generally aluminum, have an excellent strength-to-weight ratio and are easy to repair as compared to composite ones. Each secondary beam To accomplish this, the pressurized compartments normally have forward and aft bulkheads that separate the pressurized compartment from non-pressurized spaces. [0027] The depicted reinforcing structure 13 includes a series of primary beam members 15, a series of secondary beam members 16, and a series of connecting elements or strips 35. The â¦ Aircraft Spruce supplies components for a wide variety of homebuilt aircraft and discount pilot supplies. Narrow-body aircraft is expected to remain the largest segment of the global aerospace pressure bulkheads market during the forecast period of 2019 to 2024, whereas wide-body aircraft is expected to experience the highest growth during the same period. The USA would remain the growth engine of the North American market. This system that DLR initially developed for an A320 rear pressure bulkhead has now also been demonstrated for a fuselage panel and is designed to be flexible for a variety of large aerostructures, based on their digital design files, without re-teaching the robots. The bulkhead web 12 has a circular shape corresponding to the cross section of the fuselage skin 11 , and has a first surface facing toward the pressurized compartment, and a second surface opposite the first surface. These are connected to each other using state-of-the-art welding technology. It is appreciated that the bulkhead assembly 10 is used to separate a pressurized compartment, such as the cabin compartment, from a non-pressurized region or compartment, and may be used in other places in the aircraft, such as a forward bulkhead or the like. [0015] These and further features of the invention will be apparent with reference to the following description and drawings, wherein: [0016] Fig. I. [0010] In further accordance with the present invention, the bulkhead assembly includes a relatively flat plate or bulkhead web corresponding in shape and size to the cross section of the fuselage, and a relatively low height, grid-shaped reinforcing structure attached to the bulkhead web. The pressure bulkheads market for the aerospace industry is estimated to grow at an above industry growth rate over the next five years to reach an estimated value of US$ 505.5 million in 2024. 2A-2B. US20100243806A1 US12/607,597 US60759709A US2010243806A1 US 20100243806 A1 US20100243806 A1 US 20100243806A1 US 60759709 A US60759709 A US 60759709A US 2010243806 A1 US2010243806 A1 US 2010243806A1 Authority US United States Prior art keywords frame pressure bulkhead fuselage assembly bulkhead â¦ Each connecting strip 35 spans across, but is preferably not attached to, the second flange of the primary beam members 15. 11. not to be limited in scope and effect to the specific device herein shown and described nor in any other way that is inconsistent with the spirit and scope of the invention. The bulkhead web has a first side facing the pressurized compartment and a second side opposite the first side. The connecting strip 35 is attached to the exposed outer surface of the second flanges 28 of each of the inner and outer secondary beam members 16a, 16b, as shown best in Figs. The particular fuselage shown has a circular cross section, but could be oval or any other suitable shape. Media in category "Rear pressure bulkheads (aircraft fuselages)" The following 10 files are in this category, out of 10 total. 152-Druckschott.JPG 1,536 × â¦ This has resulted in an increased demand for composite pressure bulkheads. [0014] The connecting strips are attached to exposed surfaces of the second flanges of the secondary beam members, and extend across the intersection with the primary beam members. The pressure bulkhead of an aircraft is a sensitive component. 9. Both the bulkhead web 12 and the The bulkhead assembly as defined in claim 1 , wherein the connecting elements are included in a grid-like plate a plurality of intersecting strip portions. Accordingly, the plate 36 may be attached to the second flanges 23, 28 of the primary beam members 15 and the inner and outer secondary beam members 16a, 16b at the same time to provide a continuous supplemental flange structure. [0006] In most cases, pressure bulkheads for small airplanes consist of a flat web and multiple beams. Alternatively, the plate may be attached to only the second flanges 23, 28 of some of the primary and secondary beam members 15, 16. 13. The first flange 22 is disposed adjacent to the bulkhead web 12, and is preferably attached to the bulkhead web second surface by adhesive bonding and/or mechanical fasteners. The improved pressure bulkhead in the aircraft according to claim 4, wherein said pressure bulkhead essentially consists of said fiber-reinforced â¦ Thus, mechanical fasteners 33 may be inserted through the holes 31 in one beam member end portion bracket 30, through the aligned holes 32 in the primary beam member web 21 , and through holes 31 in another beam member end portion bracket 30 to attach the components to one another. whereas a conventional bulkhead height for the same size fuselage is about 250 mm. It maintains the pressure required for the cabin of an aircraft; hence, it is considered very important for the safety of passengers and crew members. The bulkhead assembly as defined in claim 4, wherein the inner secondary beam members extend between, and are attached to, adjacent primary beam members. 5 and 6. [0030] Mounting brackets 30 are provided at each end of the inner and outer secondary beam members 16a, 16b, and at each end of the primary beam member 15. [0008] The present invention is directed toward an improved design for a pressure bulkhead assembly that has a reduced height dimension and thereby helps to maximize the space available for use as the pressurized compartment in an aircraft. The CFK multi-axial layer carpets are draped to a pressure dome, stitched and then â¦ reinforcing structure 13 might be formed from suitable fiber reinforced composite materials. More particularly, this embodiment uses a single flat grid-like plate 36 that corresponds in shape to the pattern defined by the second flanges of the primary and secondary beam members 15, 16. Aircraft bulkheads in general are walls constructed of sheet metal that provide pressure, fire, or noise sealing from one compartment to the next within the airframe. Accordingly, the patent is The secondary beam member first flanges are generally co- planar with the primary beam member first flanges and engage the second side of the bulkhead web. The aircraft was involved in a tailstrike incident at Osaka International Airport seven years earlier as JAL 115, which damaged the aircraft's aft pressure bulkhead. The telescope sits in the aft portion of the aircraft and is separated from the rest of the aircraft by a pressure bulkhead . The strip 35 serves as a continuous supplemental flange structure along the entire length of each of the secondary beam members 16. Aircraft / Avionics Orders: (800) 447-3408 Radio Control Orders: (877) 219-4489 Products/Services for Aircraft Pressure Bulkhead Connector Pipe Fittings - (1900 companies) Pipe fittings are parts that connect pipe sections together or to other components in in-line, offset, multi-port, or mounting configurations. tsb-bst.gc.ca. 3; [0022] Fig. In this regard, bulkhead assembly height is the physical dimension of the bulkhead assembly extending from the pressurized compartment to the non-pressurized compartment, and for the aft bulkhead, generally extends in the forward-to-aft direction. Fasteners sold under the name "Hi-Lite" are suitable for this application. The successful roll-out of the rear pressure bulkhead prototype in mid October has further validated the engineering design and manufacturing process; it also guarantees the smooth development process of other composite parts on the aircraft. Each of the beam members has a beam web interconnecting first and second flanges. The secondary beam members mounting portions 30 may be attached to the primary beam member beam webs 21 by mechanical fasteners extending through the aligned openings 31 , 32, as described hereinbefore. The pressure bulkhead of a passenger aircraft ruptured when the aircraft was cruising at a height of 28,000 ft. Because of the sudden rupture, the rear toilets disintegrated and things like toilet rolls, tissue papers, towels, were sucked into the stabilizer compartment, where the entire tail control system was located. level atmospheric pressure inside the fuselage cabin. Flat pressure bulkhead is projected to remain the most dominant segment of the market over the next five years. [0032] The illustrated strip 35 is preferably flat and is attached to the outer surfaces of the second flanges 28 by adhesive bonding and/or mechanical fasteners. However, bulkhead connectors should not be the automatic choice when wires need to pass through a pressure or vacuum wall. A1, Ref document number: One of the repairs made was to add a splice plate on the aft pressure bulkhead. 5. 09726882, Country of ref document: [0013] The secondary beam members are discontinuous and include one or more inner beam members and a plurality of outer beam members that are generally aligned with one another. 2B is similar to Fig. The aft pressure bulkhead just closes off the back end of the tube. 2. 4. In such a situation, such a continuous connecting plate could extend all the way to the fuselage, although this is not entirely necessary. 2009726882. The flat web has a first surface facing toward the inside of the pressurized compartment and a second, opposite surface facing toward the non- pressurized compartment. Although access to the interior of the bulkhead assembly 10 from the non-pressurized side is desirable, especially adjacent the fuselage, it is also contemplated that the connecting plate 36 could be continuous and, in this regard, similar to the bulkhead web 12. In this regard, it is considered apparent that the outer surface of the mounting bracket 30 on the outer beam member 16a and the primary beam member 15 that attaches to the fuselage skin may be curved to correspond to the inner peripheral shape of the fuselage skin. In this embodiment the connecting strips 35 used in the bulkhead assembly of Figs. Pressure bulkhead of an aircraft is an essential component that covers the front and rear end of a fuselage. The bulkhead assembly as defined in claim 4, wherein the outer secondary beam members extend between, and are attached to, the fuselage skin and one of the primary beam members. The improved pressure bulkhead in the aircraft according to claim 4, wherein said circumferential support frame has a greater wall thickness than does said cupped disk. Thereafter, the connecting strips 35 are attached to the second flanges of the secondary beam members 16 by adhesive bonding and/or mechanical fasteners. More specifically, each bracket 30 has series of holes 31 formed therein that match corresponding holes 32 in the primary beam web 21 , as shown in Figs. [0012] The reinforcing structure is attached to the second side of the bulkhead web, and includes a series of primary beam members, secondary beam members, and a plurality of connecting strips. the outer secondary beam members 16b are attached to the outermost ones of the primary beam members 15. Keywordsâ Transport aircraft, Fuselage, Pressure bulkhead, Internal pressurization, Finite element method, stress analysis, Fatigue life, Crack initiation. The outer portion of the bulkhead, where it mates with the fuselage, may form a structural rib that provides structural integrity to the airframe to react pressure â¦ Archaeological evidence of bulkhead â¦ [0005] When the cockpit and cabin compartment of the aircraft is pressurized, the pressure force tends to deform the bulkhead outwardly and as a result, the bulkhead must be reinforced to provide adequate strength and stiffness to resist the force. The failure index values were less than 1 for the various regions of the bulkhead, thus showing the adequacy of design from the strength point of view. SUMMARY. Rear pressure bulkheads of aircraft are more often made with composites compared to the forward ones. A pressure bulkhead assembly adapted for installation in an aircraft fuselage includes a bulkhead web and a reinforcing structure.

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