Expansion pipe output energy evaluation method
By evaluating the energy output of the expansion tube using various simple devices, the problem of inconsistent energy evaluation of the expansion tube in the existing technology is solved, and efficient and low-cost optimization of the expansion tube configuration is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING INST OF ASTRONAUTICAL SYST ENG
- Filing Date
- 2025-11-28
- Publication Date
- 2026-04-17
AI Technical Summary
The lack of a unified method for evaluating the output energy of expansion tubes in existing technologies leads to high costs of trial and error exploration and makes it difficult to make horizontal comparisons, thus failing to efficiently obtain high-quality expansion tube configurations.
It provides a variety of simple devices for evaluating the energy of expansion tubes, including methods such as steel block movement, negative Poisson's ratio lattice structure compression, aluminum plate opening angle, and aluminum plate deflection, to accurately assess the output energy of expansion tubes and reduce test costs.
This invention provides a simple device for efficient evaluation of expansion tube energy output, enabling the acquisition of expansion tube configurations with high energy output efficiency, reducing testing costs, and facilitating flexible evaluation for different needs.
Smart Images
Figure CN121877359A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a method for evaluating the output energy of an expansion tube, belonging to the field of aerospace technology. Background Technology
[0002] The expansion tube-groove plate separation device is a commonly used linear separation device on launch vehicles. Its power source is the expansion tube, which contains an explosive cord. The explosive cord causes the expansion tube to expand outwards from its flat side, thus exerting work on the separation plate tightly attached to the expansion tube, causing it to break and achieve separation. Currently, only a single type of expansion tube is available, and there is no unified method for evaluating its work-capacity. Trial-and-error exploration using actual devices is costly, and the lack of standardized evaluation methods makes subsequent cross-sectional comparisons difficult. Summary of the Invention
[0003] The purpose of this invention is to overcome the aforementioned shortcomings and provide a method for evaluating the output energy of an expansion tube. This solves the current technical problem of lacking a method for evaluating the output energy of an expansion tube, making it impossible to obtain a superior expansion tube configuration efficiently and at low cost. This invention uses a simple device to conduct experiments on the structure of the expansion tube stage, eliminating the need to manufacture an entire separation device, thereby significantly reducing experimental costs and efficiently obtaining expansion tube configurations with high energy output efficiency.
[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution:
[0005] An evaluation method for the output energy of an expansion tube includes: a first method, a second method, a third method, or a fourth method;
[0006] The first method includes: after the expansion tube expands, it does work on the steel block, causing the steel block to move in a straight line, and the energy output of the expansion tube is obtained through the average speed of the steel block.
[0007] The second method includes: expanding the expansion tube and compressing the negative Poisson's ratio lattice structure, and obtaining the output energy of the expansion tube through the compression of the negative Poisson's ratio lattice structure;
[0008] The third method includes: after the expansion tube expands, it acts on the broken aluminum plate, and the energy output by the expansion tube is obtained by the angle of the aluminum plate opening.
[0009] The fourth method includes: the expansion tube expands and acts on the aluminum plate, and the energy output by the expansion tube is obtained through the horizontal deflection of the aluminum plate.
[0010] Furthermore, the first method is implemented using a first testing device, which includes a base, a slide rail, a target line, and a steel block;
[0011] The slide rail is mounted on the base and is a linear slide rail;
[0012] The steel block is installed on the slide rail. In the initial state, the steel block is located at one end of the slide rail, and the back of the steel block is in contact with the expansion tube. The target line is installed on the slide rail to obtain the sliding speed of the steel block.
[0013] After the expansion tube expands, it does work on the steel block, causing the steel block to move in a straight line and break the target line. The average velocity of the steel block is obtained by measuring the time it takes for the target line to break, and the output energy of the expansion tube is obtained from the average velocity of the steel block.
[0014] Furthermore, when the expansion tube is actually used for unilateral work:
[0015] The number of slide rails, target lines, and steel blocks in the first testing device is 1 each;
[0016] Expansion tube output energy
[0017] When the expansion tube is actually used for work on both sides:
[0018] The first testing device has two slide rails, two target lines, and two steel blocks. The two steel blocks have equal mass. After the expansion tube expands, it acts on the steel blocks on both sides, causing the steel blocks on both sides to move in a straight line.
[0019] Expansion tube output energy E o2 =mv 2 ;
[0020] Where m is the mass of the steel block and v is the average velocity of the steel block.
[0021] Furthermore, when the amount of explosive charge used for the expansion tube is 2-3 g / m, the weight of the steel block is 15-20 kg;
[0022] When the amount of explosive charge used in the expansion tube is 1-2 g / m, the weight of the steel block is 8-12 kg.
[0023] Furthermore, the second method is implemented using a second testing device, which includes a base, a negative Poisson's ratio lattice structure, and a steel block;
[0024] A negative Poisson's ratio lattice structure is installed inside the base;
[0025] In the initial state, the steel block is located at one end of the negative Poisson's ratio lattice structure, and the back of the steel block is in contact with the expansion tube;
[0026] After the expansion tube expands, it compresses the negative Poisson's ratio lattice structure through a steel block.
[0027] Furthermore, when the expansion tube is actually used for unilateral work:
[0028] The second test device contains one negative Poisson's ratio lattice structure and one steel block.
[0029] Expansion tube output energy Eo3 =E s abl;
[0030] When the expansion tube is actually used for work on both sides:
[0031] The second testing device has two negative Poisson's ratio lattice structures and two steel blocks of equal mass. After the expansion tube expands, it compresses the negative Poisson's ratio lattice structures on both sides through the steel blocks on both sides.
[0032] Expansion tube output energy E o4 =2E s abl;
[0033] Where E s Let be the plateau stress of the negative Poisson's ratio lattice structure, l be the compression of a single-sided lattice, b be the length of the expansion tube, and a be the height of the negative Poisson's ratio lattice structure.
[0034] Furthermore, when the explosive charge used for the expansion tube is 2-3 g / m, the plateau stress of the negative Poisson's ratio lattice structure is 8-12 kN; when the explosive charge used for the expansion tube is 1-2 g / m, the plateau stress of the negative Poisson's ratio lattice structure is 3-7 kN.
[0035] Furthermore, the third method is implemented using a third testing device, which includes a test board; the test board is a broken aluminum plate.
[0036] When the expansion tube is actually used to do work on one side, the test plate is set on one side of the expansion tube.
[0037] Expansion tube output energy
[0038] When the expansion tube is actually used to perform work on both sides, the test plate is set on both sides of the expansion tube;
[0039] Expansion tube output energy E o6 =bt 2 σ y θ;
[0040] Where t is the thickness of the test plate, σ y Let θ be the yield stress of the test plate, θ be the angle at which the test plate opens, and b be the length of the expansion tube.
[0041] Furthermore, the fourth method is implemented using a fourth testing device, which includes a test board; the test board is an aluminum plate.
[0042] When the expansion tube is actually used to do work on one side, the test plate is set on one side of the expansion tube.
[0043] Expansion tube output energy
[0044] When the expansion tube is actually used to perform work on both sides, the test plate is set on both sides of the expansion tube;
[0045] Expansion tube output energy
[0046] Where b is the length of the expansion tube, t is the thickness of the test plate, and σ y Let ω0 be the yield stress of the test plate, ω0 be the deflection at the center of the test plate, and h be the height of the deformable region of the test plate. Figure 7 and Figure 8 The distance between the two second fastening bolts 12 located on the same side.
[0047] Furthermore, when the amount of explosive charge used in the expansion tube is 2-3 g / m, the fourth method is used to evaluate the output energy of the expansion tube; when the amount of explosive charge used in the expansion tube is 1-2 g / m, the third method is used to evaluate the output energy of the expansion tube.
[0048] Compared with the prior art, the present invention has at least one of the following advantages:
[0049] (1) This invention creatively proposes an expansion tube output energy evaluation method, which is suitable for evaluating the work capacity of expansion tubes. The structure of the expansion tube stage can be tested through a simple device without the need to produce a complete set of separation devices, thereby greatly reducing the test cost and efficiently obtaining expansion tube configurations with high energy output efficiency.
[0050] (2) This invention provides a variety of test methods for evaluating the energy of expansion tubes. Each test method can accurately evaluate the output energy of the expansion tube and can be flexibly selected according to actual needs, with broad application prospects. Attached Figure Description
[0051] Figure 1 This is the first test device of the present invention for actual use of unilateral work conditions;
[0052] Figure 2 This is the first test device of the present invention for actual use of bilateral work conditions;
[0053] Figure 3 This is the second test device of the present invention for actual use of unilateral work conditions;
[0054] Figure 4 This is the second test device of the present invention for actual use of double-sided work conditions;
[0055] Figure 5 This is the third testing device of the present invention for actual use of unilateral work; the left figure shows the work before work is performed, and the right figure shows the work after work is performed;
[0056] Figure 6This is the third testing device of the present invention for actual use of double-sided work; the left figure shows the situation before work is performed, and the right figure shows the situation after work is performed;
[0057] Figure 7 This is the fourth testing device of the present invention for actual use of unilateral work; the left figure shows the work before work is performed, and the right figure shows the work after work is performed;
[0058] Figure 8 This is the fourth test device of the present invention for actual use of double-sided work; the left figure is before work is performed, and the right figure is after work is performed. Detailed Implementation
[0059] The features and advantages of the present invention will become clearer and more apparent from the following detailed description.
[0060] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.
[0061] This invention provides a method for evaluating the output energy of an expansion tube, suitable for assessing the work capacity of an expansion tube. It allows for testing of the expansion tube structure using a simple device, eliminating the need to manufacture an entire separation device, thereby significantly reducing testing costs and efficiently obtaining expansion tube configurations with high energy output efficiency.
[0062] This invention provides a method for evaluating the output energy of an expansion tube, comprising:
[0063] 1) Place the expansion tube in the center of the groove of the first testing device. For actual use where work is performed on one or both sides, the structure of the first testing device is as follows: Figure 1 and Figure 2As shown. The first test device includes a first base 1 for fixing the entire device. When the explosive cord inside works, the expansion tube 5 expands outward along its short axis, causing the expansion tube to expand into a circle and do work on the first steel block 4. The steel block generates a certain speed and slides on the slide rail 2. By testing the time it takes for the target line 3 to break, the average speed of the first steel block 4 is obtained, and then the energy output by the expansion tube is calculated. Sufficient grease should be applied between the first steel block 4 and the slide rail 2 to prevent excessive energy loss due to friction. When the amount of explosive cord acting on the expansion tube by the first test device is 2-3 g / m, the recommended weight of the first steel block 4 is between 15-20 kg. The initial speed of the steel block is about 40 m / s. The mass of the steel block can be appropriately increased or decreased according to the test sensitivity of the target line and the amount of explosive cord. The first test device evaluates the energy output of the expansion tube as shown in equations (1) and (2). Equations (1) and (2) correspond to the cases of single-sided work and double-sided work, respectively, where m is the mass of the steel block and v is the average speed of the sliding steel block.
[0064]
[0065] E o2 =mv 2 (2)
[0066] 2) Another energy testing method is achieved by compressing the negative Poisson's ratio lattice structure in the second testing device. During compression, the negative Poisson's ratio lattice structure does not compress in the other direction, maximizing the conversion of energy output from the expansion tube into plastic deformation energy. Lubricant needs to be applied to the lower end face of the negative Poisson's ratio lattice structure 7 and the second base 6 to reduce energy consumption due to friction. A certain gap is left between the upper end face and the second base 6. The second steel block 8 moves to compress the negative Poisson's ratio lattice structure. For actual use involving single-sided or double-sided work, the structure of the second testing device is as follows: Figure 3 and Figure 4 As shown. When the explosive charge applied to the expansion tube is 2-3 g / m, the plateau stress of the negative Poisson's ratio lattice is required to be around 10 kN. When the explosive charge is 1-2 g / m, the plateau stress of the negative Poisson's ratio lattice is required to be around 5 kN. The second test device evaluates the energy output of the expansion tube as shown in equations (3) and (4). Equations (3) and (4) correspond to the cases of single-sided work and double-sided work, respectively, where E s Let be the platform stress of the lattice structure, l be the compression of a single-sided lattice, a be the height of the negative Poisson's ratio lattice structure, and b be the length of the expansion tube.
[0067] E o3 =E s abl (3)
[0068] E o4 =2E s abl (4)
[0069] 3) The third energy testing method involves applying an expansion tube to a disconnected aluminum plate in the third testing device. The energy output of the expansion tube is evaluated by the angle at which the aluminum plate opens and the horizontal distance it extends. This device is suitable for situations where the explosive charge is between 1-2 g / m and the energy output is relatively small. For practical applications involving single-sided or double-sided operation, the structure of the third testing device is as follows: Figure 5 and Figure 6 As shown, the first test plate 9 is fixed with the first fastening bolt 10. The third test device evaluates the energy output of the expansion tube as shown in equations (5) and (6), where equations (5) and (6) correspond to the cases of single-sided work and double-sided work, respectively, where b is the length of the expansion tube, t is the thickness of the test plate, and σ y Let θ be the yield stress of the test plate, and θ be the angle at which the test plate bends.
[0070]
[0071] E o6 =bt 2 σ y θ (6)
[0072] 4) The fourth energy testing method involves applying an expansion tube from the fourth testing device to a test plate (aluminum plate), and evaluating the energy output of the expansion tube by measuring the horizontal deflection of the aluminum plate. This device is suitable for explosive charge amounts between 2-3 g / m and slightly higher energy outputs. For practical applications involving single-sided or double-sided operation, the structure of the fourth testing device is as follows: Figure 7 and Figure 8 As shown, the second test plate 11 is fixed by the second fastening bolt 12. The fourth test device evaluates the energy output of the expansion tube as shown in equations (7) and (8), where equations (7) and (8) correspond to the cases of single-sided work and double-sided work, respectively, where b is the length of the expansion tube, t is the thickness of the test plate, and σ is the energy output of the expansion tube. y ω is the yield stress of the test plate, and ω0 is the deflection at the center of the test plate.
[0073]
[0074] This invention provides a variety of testing methods for evaluating the energy of expansion tubes. Its work capacity can be quantitatively evaluated using a simple device. After obtaining the optimal expansion tube configuration, actual device testing can be carried out, which can greatly reduce the difficulty of testing and save time and money.
[0075] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.
[0076] The contents not described in detail in this specification are common knowledge to those skilled in the art.
Claims
1. A method for evaluating the output energy of an expansion tube, characterized in that, include: The first method, the second method, the third method, or the fourth method; The first method includes: after the expansion tube expands, it does work on the steel block, causing the steel block to move in a straight line, and the energy output of the expansion tube is obtained through the average speed of the steel block. The second method includes: expanding the expansion tube and compressing the negative Poisson's ratio lattice structure, and obtaining the output energy of the expansion tube through the compression of the negative Poisson's ratio lattice structure; The third method includes: after the expansion tube expands, it acts on the broken aluminum plate, and the energy output by the expansion tube is obtained by the angle of the aluminum plate opening. The fourth method includes: the expansion tube expands and acts on the aluminum plate, and the energy output by the expansion tube is obtained through the horizontal deflection of the aluminum plate.
2. The method for evaluating the output energy of an expansion tube according to claim 1, characterized in that, The first method is implemented using a first testing device, which includes a base, a slide rail, a target line, and a steel block. The slide rail is mounted on the base and is a linear slide rail; The steel block is installed on the slide rail. In the initial state, the steel block is located at one end of the slide rail, and the back of the steel block is in contact with the expansion tube. The target line is installed on the slide rail to obtain the sliding speed of the steel block. After the expansion tube expands, it does work on the steel block, causing the steel block to move in a straight line and break the target line. The average velocity of the steel block is obtained by measuring the time it takes for the target line to break, and the output energy of the expansion tube is obtained from the average velocity of the steel block.
3. The method for evaluating the output energy of an expansion tube according to claim 2, characterized in that, When the expansion tube is actually used for unilateral work: The number of slide rails, target lines, and steel blocks in the first testing device is 1 each; Expansion tube output energy When the expansion tube is actually used for work on both sides: The first testing device has two slide rails, two target lines, and two steel blocks. The two steel blocks have equal mass. After the expansion tube expands, it acts on the steel blocks on both sides, causing the steel blocks on both sides to move in a straight line. Expansion tube output energy E o2 =mv 2 ; Where m is the mass of the steel block and v is the average velocity of the steel block.
4. The method for evaluating the output energy of an expansion tube according to claim 3, characterized in that, When the amount of explosive charge used in the expansion tube is 2-3 g / m, the weight of the steel block is 15-20 kg; When the amount of explosive charge used in the expansion tube is 1-2 g / m, the weight of the steel block is 8-12 kg.
5. The method for evaluating the output energy of an expansion tube according to claim 1, characterized in that, The second method is implemented using a second testing device, which includes a base, a negative Poisson's ratio lattice structure, and a steel block. A negative Poisson's ratio lattice structure is installed inside the base; In the initial state, the steel block is located at one end of the negative Poisson's ratio lattice structure, and the back of the steel block is in contact with the expansion tube; After the expansion tube expands, it compresses the negative Poisson's ratio lattice structure through a steel block.
6. The method for evaluating the output energy of an expansion tube according to claim 5, characterized in that, When the expansion tube is actually used for unilateral work: The second test device contains one negative Poisson's ratio lattice structure and one steel block. Expansion tube output energy E o3 =E s abl; When the expansion tube is actually used for work on both sides: The second testing device has two negative Poisson's ratio lattice structures and two steel blocks of equal mass. After the expansion tube expands, it compresses the negative Poisson's ratio lattice structures on both sides through the steel blocks on both sides. Expansion tube output energy E o4 =2E s abl; Where E s Let be the plateau stress of the negative Poisson's ratio lattice structure, l be the compression of a single-sided lattice, b be the length of the expansion tube, and a be the height of the negative Poisson's ratio lattice structure.
7. The method for evaluating the output energy of an expansion tube according to claim 6, characterized in that, When the explosive charge used in the expansion tube is 2-3 g / m, the plateau stress of the negative Poisson's ratio lattice structure is 8-12 kN; when the explosive charge used in the expansion tube is 1-2 g / m, the plateau stress of the negative Poisson's ratio lattice structure is 3-7 kN.
8. The method for evaluating the output energy of an expansion tube according to claim 1, characterized in that, The third method is implemented using a third testing device, which includes a test board; the test board is a broken aluminum plate. When the expansion tube is actually used to do work on one side, the test plate is set on one side of the expansion tube. Expansion tube output energy When the expansion tube is actually used to perform work on both sides, the test plate is set on both sides of the expansion tube; Expansion tube output energy E o6 =bt 2 σ y θ; Where t is the thickness of the test plate, σ y Let θ be the yield stress of the test plate, θ be the angle at which the test plate opens, and b be the length of the expansion tube.
9. The method for evaluating the output energy of an expansion tube according to claim 1, characterized in that, The fourth method is implemented using a fourth testing device, which includes a test board; the test board is an aluminum plate. When the expansion tube is actually used to do work on one side, the test plate is set on one side of the expansion tube. Expansion tube output energy When the expansion tube is actually used to perform work on both sides, the test plate is set on both sides of the expansion tube; Expansion tube output energy Where b is the length of the expansion tube, t is the thickness of the test plate, and σ y ω is the yield stress of the test plate, ω0 is the deflection at the center of the test plate, and h is the height of the deformable region of the test plate.
10. The method for evaluating the output energy of an expansion tube according to claim 1, characterized in that, When the amount of explosive charge used in the expansion tube is 2-3 g / m, the fourth method is used to evaluate the output energy of the expansion tube; when the amount of explosive charge used in the expansion tube is 1-2 g / m, the third method is used to evaluate the output energy of the expansion tube.