Fuel tank simulation test piece

Abstract

The utility model relates to an oil tank simulation test piece, a frame plate, stringers and a skin form a main body frame, the frame plate is accurately positioned according to a fuselage position line, a fuselage longitudinal section line center line and a waterline zero line, and the structural stability and the simulation precision are ensured. The stringers comprise the longitudinal stringers and the latticed stringers and are made of 304 stainless steel materials, and the joints of the stringers and the frame plates are reinforced through bent angle materials, so that a stable structure is formed. The skin wraps the outer side of the main body frame to enhance the overall strength. The test piece is provided with an observation window, a pipeline connecting hole and a sensor connecting hole, so that test equipment can be observed and connected conveniently. The fuel tank simulation test piece is reasonable in design, stable in structure, high in simulation precision, convenient and flexible in test, suitable for simulation test requirements of fuel tanks of different models and specifications, capable of providing powerful support for design and performance evaluation of the fuel tanks and wide in application prospect and remarkable in economic value.

Description

Technical Field

[0001] The utility model relates to the field of aviation industry, in particular to a fuel tank simulation test piece. Background Art

[0002] In the aviation industry, the design and verification of aircraft fuel tanks and piping systems are crucial, directly impacting aircraft flight safety and performance. With the continuous advancement of aviation technology, the requirements for aircraft fuel tanks and piping systems are becoming increasingly stringent. They must not only meet the basic functions of fuel storage and transportation, but also possess excellent structural strength, rigidity, and stability to ensure safe and reliable operation under various flight conditions.

[0003] To meet this need, fuel tank simulation test pieces have emerged as a crucial testing tool. By simulating the structure and operating environment of a real aircraft fuel tank and piping system, these test pieces can comprehensively and accurately test and verify their performance. However, traditional fuel tank simulation test pieces suffer from design and manufacturing challenges, such as complex structure, excessive weight, and insufficient pressure resistance. These issues limit their application and testing accuracy.

[0004] Therefore, it is necessary to develop a new type of fuel tank simulation test piece to address the problems of traditional fuel tank simulation test pieces, improve test accuracy and reliability, and provide a more effective test tool for the design and verification of aircraft fuel tanks and piping systems. It is against this background that this patent proposes a new fuel tank simulation test piece design, aiming to meet the high requirements of the aviation industry for fuel tank and piping system test tools. Utility Model Content

[0005] The utility model aims to provide a fuel tank simulation test piece to solve the problems of complex structure, excessive weight, insufficient pressure resistance and the like in the prior art.

[0006] The utility model is implemented by adopting the following technical solution: a fuel tank simulation test piece, characterized in that it includes a skin and a main frame, the main frame is composed of a plurality of parallel frame plates and a plurality of trusses arranged perpendicular to the frame plates, two adjacent frame plates are fixedly connected to form a structural entity by a group of trusses, and the skin is wrapped around the outside of the main frame.

[0007] Furthermore, the frame panels are accurately positioned according to the fuselage position line, the center line of the fuselage longitudinal section line and the waterline zero line, so that the fuselage position lines of all frame panels are correctly positioned vertically, the center lines of the fuselage longitudinal section lines of all frame panels are in the same vertical plane, the waterline zero lines of all frame panels are in the same horizontal plane, and it is ensured that the heading directions of all frame panels are the same.

[0008] Furthermore, the trusses include longitudinal trusses and grid-shaped trusses. The outer surfaces on both sides of the longitudinal trusses are flush with the outer surfaces of the frame edges of the frame plates. The connection between the longitudinal trusses and the frame edges of the frame plates is made of 50mm long bent angle materials of the same material and angle to overlap and reinforce the welds internally. The longitudinal trusses adopt 30mmX30mmx3mm multi-angle solid-web trusses, and the truss material is 304 stainless steel, the same as the frame plate material.

[0009] Furthermore, the grid-like girder is formed by welding transverse girder on longitudinal girder, and priority is given to ensuring the overall continuity of the longitudinal girder during connection, which may be interrupted due to the arrangement of the process opening of the fuel tank simulation test piece; the outer contour plane or curved surface of the fuel tank simulation test piece forms a grid-like transverse or longitudinal girder distribution structure with a spacing of 200mm~300mm.

[0010] Furthermore, the frame plate is provided with a plurality of reinforcing ribs, and the longitudinal girders are arranged and connected to the frame plate reinforcing ribs as much as possible in the same position.

[0011] Furthermore, it also includes an observation window, a pipe connection hole and a sensor connection hole. The observation window is set at a corresponding position on the main frame. The layout of the observation window interrupts the grid-like beams in the main frame structure of the fuel tank simulation test piece. The interrupted grid-like beams here are fully welded to the edge of the welding port frame of the observation window; the pipe connection holes and the sensor connection holes are opened at corresponding positions on the skin.

[0012] Furthermore, the observation window also includes a relatively large manhole in the oil tank simulation test piece which has a large internal volume, ample space, a complex internal system, and is difficult for personnel to operate from the outside, and the manhole allows personnel to pass through.

[0013] The fuel tank simulation test piece described in the utility model has the following beneficial effects:

[0014] The main frame consists of frame plates and stringers, and is wrapped in a skin, which ensures the stability and strength of the structure while improving the accuracy of the simulation. The frame plates are accurately positioned according to specific lines, enhancing the stability and consistency of the structure. The arrangement of grid-like stringers and stiffeners, as well as the welding of longitudinal and transverse stringers, further improves the accuracy of the simulated stress distribution and deformation inside the fuel tank. The design of the observation window, pipe connection holes, and sensor connection holes makes the test more convenient and flexible. In addition, the use of 304 stainless steel improves the corrosion resistance and strength of the fuel tank simulation test piece. The design also has a wide range of applicability and can flexibly adapt to the geometric shapes and stress characteristics of different fuel tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of a fuel tank simulation test piece;

[0017] Figure 2 This is a schematic diagram of the internal structure of a fuel tank simulation test piece;

[0018] In the figure, 1-skin; 2-frame plate; 3-beam; 4-reinforcement rib; 5-observation window; 6-pipe connection hole; 7-sensor connection hole. DETAILED DESCRIPTION

[0019] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0021] like Figure 1-2 As shown, a fuel tank simulation test piece includes a main frame composed of frame plates 2 and beams 3 and a skin 1 wrapped around the outside of the main frame. The main frame includes a plurality of parallel frame plates 2 and a plurality of beams 3 arranged perpendicular to the frame plates 2. Two adjacent frame plates 2 are fixedly connected to form a structural entity by a group of beams 3.

[0022] When assembling the main frame, the frame panels 2 are accurately positioned according to the fuselage station line (STA), the fuselage longitudinal section line centerline (BLO) and the waterline zero line (WLO), so that the fuselage station line (STA) of all frame panels 2 is correctly positioned vertically, the fuselage longitudinal section line centerlines (BLO) of all frame panels 2 are in the same vertical plane, the waterline zero lines (WLO) of all frame panels 2 are in the same horizontal plane, and it is ensured that all frame panels 2 have the same heading direction.

[0023] The girder 3 includes longitudinal girder and grid-like girder. The outer surfaces on both sides of the longitudinal girder should be flush with the outer surface of the frame edge of the frame plate 2. The longitudinal girder and the frame edge of the frame plate 2 are connected with the frame edge with a 50mm length of bent angle material of the same material and angle to overlap and reinforce the weld inside. The longitudinal girder adopts 30mmX30mmx3mm multi-angle solid-web girder, and the girder material is 304 stainless steel, which is the same as the material of the frame plate 2. The grid-like girder is formed by welding transverse girder on the longitudinal girder. When connecting, the overall continuity of the longitudinal girder is prioritized. It can be interrupted due to the arrangement of the process opening of the fuel tank simulation test piece. The outer contour plane or curved surface of the fuel tank simulation test piece forms a grid-like transverse or longitudinal girder distribution structure with a spacing of 200mm~300mm. A number of reinforcing ribs 4 are provided on the frame plate 2. The longitudinal girder is arranged and connected to the reinforcing ribs 4 of the frame plate 2 as much as possible.

[0024] The fuel tank simulation test piece is also equipped with an observation window 5, pipe connection holes 6, and sensor connection holes 7. The observation window 5 is located at a corresponding position on the main frame. The placement of the observation window 5 inevitably interrupts the grid-like stringers in the main frame structure of the fuel tank simulation test piece. The interrupted grid-like stringers must be fully welded to the edge of the welded opening frame of the observation window 5. The pipe connection holes 6 and sensor connection holes 7 are opened at corresponding positions on the skin 1. For fuel tank simulation test pieces with large internal volumes, ample space, and complex internal systems that are difficult for personnel to operate from the outside, larger manholes are designed at appropriate locations.

[0025] The above embodiments describe the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Without departing from the spirit and scope of the present invention, modifications and variations made by those skilled in the art without departing from the spirit and scope of the present invention should be within the scope of protection of the appended claims.

Claims

1. A fuel tank simulation test piece, characterized in that: The invention comprises a skin (1) and a main frame, wherein the main frame is composed of a plurality of parallel frame plates (2) and a plurality of beams (3) arranged perpendicular to the frame plates (2), two adjacent frame plates (2) are fixedly connected to form a structural whole by a group of beams (3), and the skin (1) is wrapped around the outside of the main frame.

2. The fuel tank simulation test piece according to claim 1, characterized in that: The frame panels (2) are accurately positioned according to the fuselage position line, the fuselage longitudinal section line center line and the waterline zero line, so that the fuselage position lines of all frame panels (2) are correctly positioned vertically, the fuselage longitudinal section line center lines of all frame panels (2) are in the same vertical plane, the waterline zero lines of all frame panels (2) are in the same horizontal plane, and it is ensured that all frame panels (2) have the same heading direction.

3. The fuel tank simulation test piece according to claim 1, characterized in that: The trusses (3) include longitudinal trusses and grid-shaped trusses. The outer surfaces on both sides of the longitudinal trusses are flush with the outer surfaces of the frame edges of the frame plate (2). The connection between the longitudinal trusses and the frame edges of the frame plate (2) is made of 50mm long bent angle materials of the same material and angle to overlap and reinforce the welds inside. The longitudinal trusses are 30mmX30mmx3mm multi-angle solid-web trusses, and the truss material is 304 stainless steel, the same as the material of the frame plate (2).

4. The fuel tank simulation test piece according to claim 3, characterized in that: The grid-like girders are formed by welding transverse girders onto longitudinal girders. Priority is given to ensuring the overall continuity of the longitudinal girders during connection, and they may be interrupted due to the arrangement of the process openings of the fuel tank simulation test piece. The outer contour plane or curved surface of the fuel tank simulation test piece forms a grid-like transverse or longitudinal girders distribution structure with a spacing of 200mm to 300mm.

5. The fuel tank simulation test piece according to claim 1, characterized in that: A plurality of reinforcing ribs (4) are provided on the frame plate (2), and the longitudinal girders are arranged and connected to the reinforcing ribs (4) of the frame plate (2) as much as possible in the same position.

6. The fuel tank simulation test piece according to claim 1, characterized in that: It also includes an observation window (5), a pipe connection hole (6) and a sensor connection hole (7), wherein the observation window (5) is arranged at a corresponding position on the main frame, and the arrangement of the observation window (5) interrupts the grid-shaped beams in the main frame structure of the fuel tank simulation test piece, and the interrupted grid-shaped beams are fully welded to the edge of the welding opening frame of the observation window (5); the pipe connection hole (6) and the sensor connection hole (7) are opened at corresponding positions on the skin (1).

7. The fuel tank simulation test piece according to claim 6, characterized in that: The observation window (5) further includes a manhole in an oil tank simulation test piece having a large internal volume, ample space, a complex internal system, and being difficult for personnel to operate externally, wherein the manhole enables personnel to pass through.

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