A fuel tank fixing frame for a simulation test of an aircraft fuel system

Abstract

An airplane fuel system simulation test fuel tank fixing frame, the fuel tank is four groups of the same structure and capacity as the fuel tank on the airplane, including a first fuselage fuel tank test piece, a second fuselage fuel tank test piece and two groups of symmetrically arranged left and right wing fuel tank test pieces, the four groups of fuel tank test pieces and test equipment are connected through test pipelines and communication lines;The fixing frame is a truss structure, a first fuselage fuel tank test piece mounting area and a second fuselage fuel tank test piece mounting area are arranged in the truss structure, left and right wing fuel tank test piece mounting areas are symmetrically arranged on both sides of the truss structure, and connecting flanges for fixing and assembling with the test bench outer frame are arranged at the front and rear ends of the truss structure.The present application not only reduces the test cost and shortens the verification period, but also obtains performance parameters under the limit state, and ensures the reliability of the test conclusion.

Description

Technical Field

[0001] This utility model relates to the field of testing and measurement technology, specifically a fuel tank fixing frame for aircraft fuel system simulation testing. 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. Utility Model Content

[0004] This utility model provides a fuel tank fixing frame for simulating aircraft fuel system tests. The purpose is to support the fuel tank test piece through the fixing frame to simulate the assembly structure of the fuel tank and the aircraft body. The fixing frame is connected to the outer frame of the test bench, and the outer frame drives the fixing 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 test costs and ensuring the reliability of test results.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A fuel tank mounting frame for simulating an aircraft fuel system test is provided. 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 the test equipment are connected by test pipelines and communication lines. The mounting frame is a truss structure. The truss structure has an installation area for the first fuselage fuel tank test piece and an installation area for the second fuselage fuel tank test piece inside. The left and right wing fuel tank test piece installation areas 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.

[0006] The fuel tank fixing frame for the above-mentioned aircraft fuel system simulation test has several sets of first connecting wings on the outer wall of the first fuselage fuel tank test piece. The first fuselage fuel tank test piece is installed in the first fuselage fuel tank test piece installation area of ​​the fixing frame through the first connecting wings and bolts. A first observation window is set 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 fuel tank fixing frame for the above-mentioned aircraft fuel system simulation test has several sets of second connecting wings on the outer wall of the second fuselage fuel tank test piece. The second fuselage fuel tank test piece is installed in the second fuselage fuel tank test piece installation area of ​​the fixing frame through the second connecting wings and bolts. A second observation window is set on the side wall of the second fuselage fuel tank test piece, and a window cover made of transparent material is installed at the second observation window.

[0008] The fuel tank fixing frame for the above-mentioned aircraft fuel system simulation test includes two symmetrically arranged parts for the left and right wing fuel tank test pieces. A third connecting wing is set on the upper and lower inner edge of each part. The left and right wing fuel tank test pieces are installed on the left and right wing fuel tank test piece installation area of ​​the fixing frame through the third connecting wing and bolts. A third observation window is set on the left and right wing fuel tank test pieces, and a transparent window cover is installed at the third observation window.

[0009] The fuel tank fixing frame for the above-mentioned aircraft fuel system simulation test, 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 a set position, 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 fuel tank fixing frame for the above-mentioned aircraft fuel system simulation test is also equipped with a test instrument mounting platform. The test instrument mounting platform is located at the top of the truss structure and is arranged symmetrically from left to right.

[0011] The aforementioned fuel tank fixing frame for the aircraft fuel system simulation test is further equipped 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 fixing frame for simulating aircraft fuel system tests. 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 fixing frame supports these four sets of fuel tank test pieces to simulate the assembly structure of the fuel tanks and the aircraft fuselage. The fixing 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 fixing frame to simulate the aircraft's pitching and rolling movements, thereby achieving the experimental verification of the aircraft fuel system's technical parameters 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 this utility model; 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 an aircraft's fuel system 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 fixing frame for simulating aircraft fuel system tests. The fixing frame can support the fuel tank test piece to simulate the assembly structure of the fuel tank and the aircraft body. The fixing frame is connected to the outer frame of the test bench, and the outer frame drives the fixing frame to simulate the aircraft's pitch, roll, and other movements, providing technical support for verifying the working status of the aircraft's 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 fixing frame for the aircraft fuel system simulation test described in this utility model comprises four sets of fuel tank test pieces with the same structure and capacity as the fuel tanks 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 fixing frame 1. The four sets of fuel tank test pieces and the test equipment are connected via test pipelines and communication lines. The fixing frame 1 of this utility model adopts a large truss structure, consisting of a frame, connecting arms, support frames, tie arms, and reinforcing ribs. The test bench is composed of components, with 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 to be 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 driven by 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 this utility model, a test instrument installation platform 1-5, an operating platform 1-6, and a ladder 1-7 are also provided on its fixed frame 1. The test instrument installation 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 installation platform 1-5. The operating platform 1-6 is located on the left and right side fuel tank test piece installation areas 1-3 and is flush with the test instrument installation 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 fixing frame for the aircraft fuel system simulation test described in this utility model has a frame plate and skin structure for 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. The frame plate and skin are made of aluminum alloy, and the skin covers the frame plate to form a sealed cavity. The skin is provided with an observation window at a set position. The window cover is made of high-strength organic glass and is installed at the observation window by bolts. The operator can monitor the fuel status inside the fuel tank test piece in real time through the observation window.

[0020] See Figure 1 , Figure 4 The fuel tank fixing frame for the aircraft fuel system simulation test of this utility model has a first connecting wing 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 fixing frame for the aircraft fuel system simulation test of this utility model has 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 fixing frame for the aircraft fuel system simulation test described in this utility model includes two symmetrically arranged parts 4 for the left and right wing fuel tank test pieces 4. A third connecting wing 4-1 is provided on the upper and lower inner edges of each part. The left and right wing fuel tank test pieces 4 are installed in the left and right wing fuel tank test piece installation areas 1-3 of the fixing 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 pieces 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 fixing frame for simulating aircraft fuel system tests. 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. This 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 fixing frame for aircraft fuel system simulation testing, characterized in that: The fuel tank consists of four sets of fuel tank test pieces with the same structure and capacity as the fuel tanks on the aircraft, including a first fuselage fuel tank test piece (2), a second fuselage fuel tank test piece (3), and two sets of left and right wing fuel tank test pieces (4) arranged symmetrically. The four sets of fuel tank test pieces and test equipment are connected by test pipelines and communication lines. The fixed frame (1) is a truss structure. The first fuselage fuel tank test piece installation area (1-1) and the second fuselage fuel tank test piece installation area (1-2) are provided inside the truss structure. The left and right wing fuel tank test piece installation areas (1-3) are symmetrically arranged on both sides of the truss structure. The connecting flanges (1-4) that are fixedly assembled with the outer frame (5) of the test bench are provided at the front and rear ends of the truss structure.

2. The fuel tank fixing frame for aircraft fuel system simulation test according to claim 1, characterized in that: The first fuselage fuel tank test piece (2) has several sets of first connecting wings (2-1) on its outer wall. 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 first connecting wings (2-1) and bolts. A first observation window (2-2) is set on the side wall of the first fuselage fuel tank test piece (2), and a window cover plate of transparent material is installed at the first observation window (2-2).

3. The fuel tank fixing frame for aircraft fuel system simulation test according to claim 2, characterized in that: The second fuselage fuel tank test piece (3) has several sets of second connecting wings (3-1) on its outer wall. 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 second connecting wings (3-1) and bolts. A second observation window (3-2) is set on the side wall of the second fuselage fuel tank test piece (3), and a window cover plate of transparent material is installed at the second observation window (3-2).

4. The fuel tank fixing frame for aircraft fuel system simulation test according to claim 3, characterized in that: The left and right side wing fuel tank test piece (4) includes two parts arranged symmetrically on the left and right. A third connecting wing (4-1) is set on the upper and lower inner edge of each part. The left and right side wing fuel tank test piece (4) is installed on the left and right side 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 set on the left and right side wing fuel tank test piece (4), and a window cover plate of transparent material is installed at the third observation window (4-2).

5. The fuel tank fixing frame for aircraft fuel system simulation test according to claim 4, characterized in that: The first fuselage fuel tank test piece (2), the second fuselage fuel tank test piece (3), and the left and right side wing fuel tank test pieces (4) are all frame plates and skin-fitting 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, and the window covers are installed at the observation windows by bolts.

6. The fuel tank fixing frame for aircraft fuel system simulation testing according to any one of claims 1 to 5, characterized in that: The fixed frame (1) is also provided with a test instrument installation platform (1-5), which is located at the top of the truss structure and is arranged in a symmetrical manner.

7. The fuel tank fixing frame for aircraft fuel system simulation test according to claim 6, characterized in that: The fixed frame (1) is also provided with an operating platform (1-6) and a ladder (1-7); the operating platform (1-6) is located on 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 ladder (1-7) is installed between the operating platform (1-6) and the bottom of the truss structure.

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