Fuel tank suitable for ground simulation test of aircraft fuel system and fixing frame of fuel tank

Abstract

The invention relates to a fuel tank suitable for a ground simulation test of an aircraft fuel system and a fixing frame of the fuel tank, the fuel tank comprises four groups of fuel tank test pieces with the same structure and capacity as the fuel tank on an aircraft, and the fuel tank comprises a first fuselage fuel tank test piece, a second fuselage fuel tank test piece and two groups of left and right flank fuel tank test pieces, the four groups of fuel tank test pieces and the test equipment are connected through a test pipeline and a communication line; the fixing frame is of a truss structure, a first fuselage fuel tank test piece installation area and a second fuselage fuel tank test piece installation area are arranged in the truss structure, left and right side wing fuel tank test piece installation areas are symmetrically arranged on the two sides of the truss structure, and connecting flanges fixedly assembled with the test bed outer frame are arranged at the front end and the rear end of the truss structure. And the fixed frame is driven by the test bed outer frame to realize pitching and overturning actions. According to the method, the test cost is reduced, the verification period is shortened, the performance parameters in the limit state can be obtained, and the reliability of the test conclusion is ensured.

Description

Technical Field

[0001] This invention relates to the field of testing and measurement technology, specifically to a fuel tank and its fixing frame suitable for ground simulation tests of aircraft fuel systems. Background Technology

[0002] The function of an aircraft fuel system is to store and continuously supply fuel to the engines and auxiliary power units. It also plays a role in controlling the aircraft's center of gravity, using fuel as a cooling source for hydraulic and air conditioning systems, emergency fuel dumping, and fire safety. Because aircraft consume a large amount of fuel during flight, the fuel tanks, when fully loaded, constitute a significant proportion of the aircraft's weight. To maintain the aircraft's balance, fuel must be distributed into tanks located in the fuselage and wings, and the fuel supply sequence to each tank must be controlled. During flight, the continuous consumption of fuel causes changes in the aircraft's center of gravity. Furthermore, the aircraft's pitching and rolling maneuvers also affect the normal operation of the fuel system. To ensure safe flight, fuel system performance tests must be conducted under different operating conditions.

[0003] Currently, the performance of the fuel system under different operating conditions of an aircraft is generally verified through ground tests. However, if airframe components are used directly for testing, it is not only difficult to obtain performance parameters under extreme conditions due to the high cost of trial and error, but also the verification cycle is extended due to the cumbersome disassembly and assembly operations. Summary of the Invention

[0004] This invention provides a fuel tank and its fixed frame suitable for ground simulation tests of aircraft fuel systems. The purpose is to use the fixed frame to support the fuel tank test piece to simulate the assembly structure of the fuel tank and the aircraft body. The fixed frame is connected to the outer frame of the test bench, and the outer frame drives the fixed frame to simulate the pitch, roll and other movements of the aircraft, so as to verify the working status of the fuel system under different operating conditions of the aircraft, thereby reducing the test cost and ensuring the reliability of the test results.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A fuel tank and its fixing frame suitable for ground simulation testing of aircraft fuel systems are disclosed. The fuel tank consists of four sets of fuel tank test pieces with the same structure and capacity as the fuel tanks on an aircraft, including a first fuselage fuel tank test piece, a second fuselage fuel tank test piece, and two sets of symmetrically arranged left and right wing fuel tank test pieces. The four sets of fuel tank test pieces and test equipment are connected by test pipelines and communication lines. The fixing frame is a truss structure, with installation areas for the first and second fuselage fuel tank test pieces inside the truss structure. Installation areas for the left and right wing fuel tank test pieces are symmetrically arranged on both sides of the truss structure. Connecting flanges for fixed assembly with the outer frame of the test bench are provided at the front and rear ends of the truss structure. The fixing frame is driven by the outer frame of the test bench to achieve pitch and roll movements.

[0006] The above-mentioned fuel tank and its fixed frame suitable for ground simulation test of aircraft fuel system, wherein the outer wall of the first fuselage fuel tank test piece is provided with several sets of first connecting wings, the first fuselage fuel tank test piece is installed in the first fuselage fuel tank test piece installation area of ​​the fixed frame through the first connecting wings and bolts, a first observation window is provided on the side wall of the first fuselage fuel tank test piece, and a window cover plate of transparent material is installed at the first observation window.

[0007] The above-mentioned fuel tank and its fixed frame are suitable for ground simulation tests of aircraft fuel systems. The outer wall of the second fuselage fuel tank test piece is provided with several sets of second connecting wings. The second fuselage fuel tank test piece is installed in the installation area of ​​the second fuselage fuel tank test piece on the fixed frame through the second connecting wings and bolts. A second observation window is provided on the side wall of the second fuselage fuel tank test piece, and a window cover plate of transparent material is installed at the second observation window.

[0008] The aforementioned fuel tank and its fixed frame suitable for ground simulation tests of aircraft fuel systems, wherein the left and right wing fuel tank test pieces comprise two symmetrically arranged parts, with a third connecting wing set above and below the inner edge of each part, the left and right wing fuel tank test pieces are mounted on the left and right wing fuel tank test piece mounting area of ​​the fixed frame via the third connecting wing and bolts, a third observation window is provided on the left and right wing fuel tank test pieces, and a transparent window cover is installed at the third observation window.

[0009] The aforementioned fuel tanks and their fixing frames suitable for ground simulation tests of aircraft fuel systems, including the first fuselage fuel tank test piece, the second fuselage fuel tank test piece, and the left and right wing fuel tank test pieces, are all frame plates and skin mating structures; the frame plates and skins are all made of aluminum alloy, and the skins cover the frame plates to form a sealed cavity; the skins are provided with observation windows at set positions, and the window covers are made of high-strength organic glass, and the window covers are installed at the observation windows by bolts.

[0010] The aforementioned fuel tank and its fixed frame are suitable for ground simulation tests of aircraft fuel systems. The fixed frame is also equipped with a test instrument mounting platform, which is located at the top of the truss structure and is arranged symmetrically from left to right.

[0011] The aforementioned fuel tank and its fixed frame, suitable for ground simulation testing of aircraft fuel systems, are provided with an operating platform and a ladder. The operating platform is located above the fuel tank test piece installation area on the left and right wings, and is flush with the test instrument installation platform at the top of the truss structure. A ladder is installed between the operating platform and the bottom of the truss structure.

[0012] This invention provides a fuel tank and its mounting frame suitable for ground simulation testing of aircraft fuel systems. It replaces four sets of fuel tanks on an aircraft with a first fuselage fuel tank test piece, a second fuselage fuel tank test piece, and left and right wing fuel tank test pieces. The mounting frame supports the four sets of fuel tank test pieces to simulate the assembly structure of the fuel tanks and the aircraft fuselage. The mounting frame is connected to the outer frame of the test bench via flanges at both ends. The outer frame of the test bench drives the mounting frame to simulate the aircraft's pitching, rolling, and other maneuvers, thereby achieving the experimental verification of the technical parameters of the aircraft fuel system through ground simulation. This invention, through the above technical means, not only reduces testing costs and shortens the verification cycle but also obtains performance parameters under extreme conditions, ensuring the reliability of the test conclusions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of a fixed frame structure; Figure 3 This is a schematic diagram of the assembly structure of the fixed frame and the outer frame of the test bench; Figure 4 This is a schematic diagram of the structure of the first fuselage fuel tank test piece; Figure 5 This is a schematic diagram of the second fuselage fuel tank test piece. Figure 6 This is a schematic diagram of the structure of the left and right wing fuel tank test pieces (taking the right wing fuel tank test piece as an example).

[0014] Explanation of each label in the diagram: 1 is a fixed frame; 1-1 is the installation area for the first fuselage fuel tank test piece; 1-2 is the installation area for the second fuselage fuel tank test piece; 1-3 is the installation area for the left and right wing fuel tank test pieces; 1-4 is a connecting flange; 1-5 is a test instrument installation platform; 1-6 is an operating platform; 1-7 is a step ladder. 2 is the first fuselage fuel tank test piece, 2-1 is the first connecting fin, and 2-2 is the first observation window; 3 is the second fuselage fuel tank test piece, 3-1 is the second connecting fin, and 3-2 is the second observation window; 4 represents the test pieces for the left and right side wing fuel tanks; 4-1 represents the third connecting wing; and 4-2 represents the third observation window. 5 represents the outer frame of the test bench, 5-1 represents the tilt drive shaft, 5-2 represents the pitch drive shaft, and 5-3 represents the flange of the outer frame of the test bench. Detailed Implementation

[0015] Currently, the performance of aircraft fuel systems under different operating conditions is generally verified through ground tests. To reduce testing costs and shorten the verification cycle, this invention provides a fuel tank and its fixed frame suitable for ground simulation testing of aircraft fuel systems. The fixed frame can support the fuel tank test piece to simulate the assembly structure of the fuel tank and the aircraft body. The fixed frame is connected to the outer frame of the test bench, and the outer frame drives the fixed frame to simulate the pitch, roll and other movements of the aircraft, providing technical support for verifying the working status of the aircraft fuel system under different operating conditions.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] See Figure 1. Figure 2 , Figure 3 The fuel tank and its fixed frame suitable for ground simulation testing of aircraft fuel systems, as described in this invention, consist of four sets of fuel tank test pieces with the same structure and capacity as those on an aircraft. These include a first fuselage fuel tank test piece 2, a second fuselage fuel tank test piece 3, and two sets of symmetrically arranged left and right wing fuel tank test pieces 4. The first fuselage fuel tank test piece 2, the second fuselage fuel tank test piece 3, and the left and right wing fuel tank test pieces 4 are respectively installed in corresponding installation areas on the fixed frame 1. The four sets of fuel tank test pieces and the test equipment are connected via test pipelines and communication lines. The fixed frame 1 of this invention adopts a large truss structure, consisting of a frame, connecting arms, support frames, tie arms, and reinforcing ribs, etc. The components consist of a first fuselage fuel tank test piece installation area 1-1 and a second fuselage fuel tank test piece installation area 1-2 inside the truss structure, and left and right wing fuel tank test piece installation areas 1-3 symmetrically arranged on both sides of the truss structure; connecting flanges 1-4 are set at the front and rear ends of the truss structure and are fixedly assembled with the outer frame flange 5-3 of the test bench. Therefore, the fixed frame 1 can be driven by the flip drive shaft 5-1 of the outer frame 5 of the test bench (the flip drive shaft 5-1 is connected to the power source of the test equipment) to achieve the flipping action, and the pitch drive shaft 5-2 of the outer frame 5 of the test bench (the pitch drive shaft 5-2 is connected to the power source of the test equipment) to achieve the pitching action.

[0018] See Figure 2In a preferred embodiment of the present invention, a test instrument mounting platform 1-5, an operating platform 1-6, and a ladder 1-7 are also provided on its fixed frame 1. The test instrument mounting platform 1-5 is located at the top of the truss structure and is arranged symmetrically on both sides. Test equipment, testing equipment, wiring harness assemblies, high-voltage and low-voltage cables, fuel line accessories, simulated supporting pipelines, etc. can be installed on the test instrument mounting platform 1-5. The operating platform 1-6 is located on the left and right side fuel tank test piece mounting areas 1-3 and is flush with the test instrument mounting platform 1-5 at the top of the truss structure. A ladder 1-7 is installed between the operating platform 1-6 and the bottom of the truss structure. Operators can climb the ladder 1-7 to the operating platform 1-6 to install and debug the test instruments and equipment.

[0019] See Figure 1. Figure 2 The fuel tank and its fixing frame suitable for ground simulation testing of aircraft fuel systems according to the present invention, wherein the first fuselage fuel tank test piece 2, the second fuselage fuel tank test piece 3, and the left and right wing fuel tank test pieces 4 are all frame plates and skin mating structures; the frame plates and skins are all made of aluminum alloy, and the skins cover the frame plates to form a sealed cavity; the skins are provided with observation windows at a set position, and the window covers are made of high-strength organic glass. The window covers are installed at the observation windows by bolts, and the operators can monitor the fuel status inside the fuel tank test pieces in real time through the observation windows.

[0020] See Figure 1 , Figure 4 The fuel tank and its fixing frame suitable for ground simulation testing of aircraft fuel systems according to the present invention have a first connecting fin 2-1 on the outer wall of the first fuselage fuel tank test piece 2, as shown in the attached figure. Figure 4 As shown, the first connecting wing 2-1 includes eight sets symmetrically arranged on the top, left and right sides and bottom of the first fuselage fuel tank test piece 2. The first fuselage fuel tank test piece 2 is installed in the first fuselage fuel tank test piece installation area 1-1 of the fixed frame 1 through the above-mentioned eight sets of first connecting wings 2-1 and bolts. A first observation window 2-2 is provided on the side wall of the first fuselage fuel tank test piece 2, and a window cover made of high-strength organic glass is installed at the first observation window 2-2. The first observation window 2-2 is arranged on the left and right sides and the rear end face of the first fuselage fuel tank test piece 2.

[0021] See Figure 1 , Figure 5 The fuel tank and its fixing frame suitable for ground simulation testing of aircraft fuel systems described in this invention have a second connecting fin 3-1 on the outer wall of the second fuselage fuel tank test piece 3, as shown in the attached figure. Figure 5As shown, the second connecting wing 3-1 includes twelve sets symmetrically arranged on the top, left and right sides and bottom of the second fuselage fuel tank test piece 2. The second fuselage fuel tank test piece 3 is installed in the second fuselage fuel tank test piece installation area 1-2 of the fixed frame 1 through the above twelve sets of second connecting wings 3-1 and bolts. A second observation window 3-2 is provided on the side wall of the second fuselage fuel tank test piece 3, and a window cover made of high-strength organic glass is installed at the second observation window 3-2.

[0022] See Figure 1 , Figure 6 The fuel tank and its fixed frame suitable for ground simulation test of aircraft fuel system according to the present invention, the left and right wing fuel tank test piece 4 includes two parts arranged symmetrically on the left and right sides. A third connecting wing 4-1 is provided on the inner edge of each part. The left and right wing fuel tank test piece 4 is installed on the left and right wing fuel tank test piece installation area 1-3 of the fixed frame 1 through the third connecting wing 4-1 and bolts. A third observation window 4-2 is provided on the left and right wing fuel tank test piece 4, and a window cover made of high-strength organic glass is installed at the third observation window 4-2.

[0023] See Figures 1 to 6 This invention provides a fuel tank and its fixing frame suitable for ground simulation testing of aircraft fuel systems. It can replace the four sets of fuel tanks on the aircraft with the first fuselage fuel tank test piece 2, the second fuselage fuel tank test piece 3, and the left and right wing fuel tank test pieces 4, avoiding damage to the original fuel tanks under extreme conditions during the test. The invention uses the fixing frame 1 to support the four sets of fuel tank test pieces to simulate the assembly structure of the fuel tank and the aircraft fuselage. The fixing frame 1 is connected to the outer frame flange 5-3 of the test bench through the connecting flanges 1-4 at the front and rear ends of the fixing frame 1. The rotating drive shaft 5-1 on the outer frame 5 of the test bench can drive the fixing frame 1 to simulate the aircraft's rolling and other actions, and the pitch drive shaft 5-2 on the outer frame 5 of the test bench can drive the fixing frame 1 to simulate the aircraft's pitch and other actions, thereby realizing the test verification of the technical parameters of the fuel system under different operating conditions of the aircraft.

Claims

1. A fuel tank and its fixing frame suitable for ground simulation test of an aircraft fuel system, characterized in that: The oil tank is four groups of tank test pieces with the same structure and capacity as the oil tank on the aircraft, including a first fuselage tank test piece (2), a second fuselage tank test piece (3) and two groups of left and right wing tank test pieces (4) symmetrically arranged, the four groups of tank test pieces and test equipment are connected through test pipelines and communication lines; the fixed frame (1) is a truss structure, a first fuselage tank test piece mounting area (1-1) and a second fuselage tank test piece mounting area (1-2) are arranged in the truss structure, left and right wing tank test piece mounting areas (1-3) are symmetrically arranged on both sides of the truss structure, and connecting flanges (1-4) are arranged at the front and rear ends of the truss structure and fixedly assembled with the test bench outer frame (5), the fixed frame (1) is driven by the test bench outer frame (5) to realize the up-down and overturning actions.

2. Tank and its fixing frame suitable for ground simulation test of aircraft fuel system according to claim 1, characterized in that: A plurality of first connecting fins (2-1) are arranged on the outer wall of the first fuselage tank test piece (2), the first fuselage tank test piece (2) is mounted in the first fuselage tank test piece mounting area (1-1) of the fixed frame (1) through the first connecting fins (2-1) and bolts, a first observation window (2-2) is arranged on the side wall of the first fuselage tank test piece (2), and a window cover plate made of transparent material is mounted at the first observation window (2-2).

3. The tank and its fixing frame suitable for ground simulation test of aircraft fuel system according to claim 2, characterized in that: A plurality of second connecting fins (3-1) are arranged on the outer wall of the second fuselage tank test piece (3), the second fuselage tank test piece (3) is mounted in the second fuselage tank test piece mounting area (1-2) of the fixed frame (1) through the second connecting fins (3-1) and bolts, a second observation window (3-2) is arranged on the side wall of the second fuselage tank test piece (3), and a window cover plate made of transparent material is mounted at the second observation window (3-2).

4. The tank and its fixing frame suitable for ground simulation test of aircraft fuel system according to claim 3, characterized in that: The left and right wing tank test pieces (4) include two parts symmetrically arranged, third connecting fins (4-1) are arranged on the inner side edge portions of each part, the left and right wing tank test pieces (4) are mounted in the left and right wing tank test piece mounting areas (1-3) of the fixed frame (1) through the third connecting fins (4-1) and bolts, third observation windows (4-2) are arranged on the left and right wing tank test pieces (4), and window cover plates made of transparent material are mounted at the third observation windows (4-2).

5. The tank and its fixing frame suitable for ground simulation test of aircraft fuel system according to claim 4, characterized in that: The first fuselage tank test piece (2), the second fuselage tank test piece (3) and the left and right wing tank test pieces (4) are all frame plate and skin cooperation structures; the frame plate and the skin are both made of aluminum alloy material, the skin covers the frame plate to form a sealed cavity; the skin is provided with observation windows at the set positions, the window cover plates are made of high-strength organic glass material, and the window cover plates are mounted at the observation windows through bolts.

6. Tank and its fixing frame suitable for ground simulation test of aircraft fuel system, according to any of claims 1 to 5, characterized in that: The fixed frame (1) is further provided with a test instrument mounting platform (1-5), the test instrument mounting platform (1-5) is located at the top of the truss structure and is arranged in a left-right symmetric structure.

7. The tank and its fixing frame suitable for ground simulation test of aircraft fuel system according to claim 6, characterized in that: The fixed frame (1) is further provided with an operation platform (1-6) and a step ladder (1-7); the operation platform (1-6) is located above the left and right side wing oil tank test piece installation area (1-3) and is flush with the test instrument installation platform (1-5) at the top of the truss structure, and the step ladder (1-7) is installed between the operation platform (1-6) and the bottom of the truss structure.

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