Array type energy absorption target plate

Abstract

The invention belongs to the technical field of aero-engines, and particularly relates to an array type energy absorption target plate. Comprising a support frame; the multiple knife-shaped columns are fixed to the supporting frame at intervals, and cutting edges of the knife-shaped columns face the throwing direction of an impact object; the energy absorption turning plates are hung between the adjacent knife-shaped columns in a turnover mode through rotating shafts and arranged into a multi-layer array in the vertical direction, and the energy absorption turning plates are configured to turn over when being impacted so as to allow an impacted object to pass through and absorb kinetic energy of the impacted object; the inclined back plate is obliquely arranged on the side, opposite to an impact object, of the array type energy absorption turning plate, and the projectile body collecting box is located below the inclined back plate and used for collecting the impact object penetrating through the energy absorption turning plate array.

Description

Technical Field

[0001] This application belongs to the field of aero-engine technology, and specifically relates to an array-type energy-absorbing target plate. Background Technology

[0002] According to CCAR airworthiness requirements, all-weather aircraft must pass flight tests under special weather conditions such as rain, snow, and hail. In particular, the ingestion of foreign objects such as rain, snow, ice, birds, and sand into the engine has repeatedly caused engine failures and aircraft damage. Therefore, the special engine swallowing test is a necessary component for obtaining airworthiness certification and is critically related to aircraft safety.

[0003] During the special test of engine swallowing, an air cannon throwing device is used to launch the swallowed object at a certain speed to a radial position inside the air intake to test the engine's reliability. The projectile is mainly made of bird bodies, ice hockey pucks, or simulated projectiles, and the muzzle velocity ranges from 60 to 180 m / s.

[0004] The air cannon throwing device is divided into an air cannon launching mechanism, a control system, an interception target plate, a speed measuring system, and a high-speed camera system. The energy-absorbing target plate (1) used for the whole-machine swallowing special test mentioned in this article is an important component of the air cannon throwing device, mainly used for:

[0005] Intercept pre-test projectiles to prevent them from impacting the engine during the pre-test preparation phase;

[0006] Energy-absorbing treatment is applied to projectiles to prevent hard impacts on the target plate, avoid damage to the target plate, and extend its service life.

[0007] Confirm the impact point of the projectile and adjust the direction of the gun muzzle accordingly;

[0008] Waste collection after projectile impact;

[0009] Depending on the test requirements, the swallowed object can be single or multiple, with varying muzzle velocities. Typically, a test mission requires multiple firings to correct the projectile's muzzle velocity and repeatedly adjust the muzzle direction to confirm the impact point. Once the position is determined, a target plate needs to be placed between the muzzle and the engine to intercept the projectile and prevent it from directly impacting the engine during firing. During this process, the target plate needs to be moved multiple times to coordinate with the engine's movement. Certain specific swallowed objects (such as ice hockey pucks) require multiple target plate movements within a short period.

[0010] Currently, the main material of the target plate is thick steel plate. The weight of the projectile used in conventional tests is about 500g, and the velocity is 60~180m / s.

[0011] To ensure the reliability of the interception, thick steel plates are required. The overall design weight is about 4 tons. It is supported by two pairs of heavy transport wheels and requires a tractor for towing, which makes it difficult to move quickly and affects the continuity of the test process.

[0012] The projectile has excessive kinetic energy and lacks a buffer energy absorption device. Hard interception with thick steel plates, after repeated impacts, easily causes deformation and cracks in the target plate, reducing its service life and seriously threatening engine safety.

[0013] The muzzle calibration process requires manually attaching markers to the target plate. After impact, the target plate is left with a splash-like disc pattern, making it impossible to directly confirm the impact point. Furthermore, the markers are damaged after impact, requiring multiple manual attachments, which is tedious and inefficient.

[0014] There is no projectile collection device. During real bird impact tests, the debris ejected after the bird strike can easily damage other equipment on site. The debris scattered throughout the test area is difficult to clean and, upon decomposition, can easily breed bacteria, posing a risk of disease outbreaks. Summary of the Invention

[0015] To address the aforementioned problems, this application provides an array-type energy-absorbing target plate, comprising:

[0016] Supporting framework;

[0017] Multiple blade-shaped posts are fixed to the support frame at intervals, with their cutting edges facing the direction of the impactor's throw.

[0018] Multiple energy-absorbing flaps, which are rotatably suspended between adjacent blade-shaped columns via a rotation axis and arranged in a multi-layer array in the vertical direction, are configured to flip upon impact to allow the impacting object to pass through and absorb its kinetic energy.

[0019] An inclined backplate and a projectile collection box are provided. The inclined backplate is inclinedly disposed on the side of the array of energy-absorbing flaps facing away from the impactor. The projectile collection box is located below the inclined backplate and is used to collect the impactor that passes through the array of energy-absorbing flaps.

[0020] Preferably, the energy-absorbing flap is a composite layer structure, including a soft rubber layer facing the direction of the impact and a metal plate layer facing away from the direction of the impact.

[0021] Preferably, the metal plate layer of the upper energy-absorbing flap extends downward and overlaps the lower energy-absorbing flap, so that when the first energy-absorbing flap is impacted and moves, it can drive the energy-absorbing flap above it to move together.

[0022] Preferably, the blade-shaped column is made of high-strength steel, and its cutting edge is configured to cut impactors.

[0023] Preferably, the support frame is a lightweight mobile platform made of hollow square steel.

[0024] Preferably, the inclined back plate is a high-strength steel inclined back plate with reinforcing ribs.

[0025] Preferably, the main body of the energy-absorbing flap is a metal plate layer, the length of which is greater than the length of the soft rubber layer.

[0026] An impact testing method, employing the aforementioned array-type energy-absorbing target plate, characterized in that the method comprises:

[0027] Adjust the throwing direction of the impactor so that it strikes a specific layer of the energy-absorbing flap array;

[0028] After the impacting object interacts with the energy-absorbing flap and the inclined back plate in sequence, it falls into the projectile collection box.

[0029] The impact effect is evaluated by analyzing the impact location information left on the energy-absorbing flap and the collected impact material.

[0030] This application has the following effects:

[0031] (1) Weight reduction through structural design enables rapid movement of the target plate;

[0032] (2) In the original design, there was no energy-absorbing structure, and the projectile made hard contact with the target plate, resulting in a large amount of energy and making it easy to crack or deform. This design uses a suspended array of flaps to absorb and buffer the energy of the projectile, which can effectively reduce the energy generated when the projectile collides with the target plate and increase its service life.

[0033] (3) In the original scheme, the muzzle calibration process was difficult, cumbersome, and inefficient. This scheme can effectively solve the problem of repeated calibration, improve work efficiency, and reduce workload.

[0034] (4) This solution can reduce the splashing after the projectile impact. By using the bottom projectile collection device, it can be cleaned up and buried in a unified manner, which can prevent the occurrence of plagues and diseases. Attached Figure Description

[0035] Figure 1 This is a model diagram of an array-type energy-absorbing target plate;

[0036] Figure 2 It is a knife-shaped column;

[0037] Figure 3 It is an energy-absorbing flap;

[0038] Figure 4 This is a diagram illustrating a bird impact.

[0039] Figure 5 That is the location of the impact.

[0040] Figure 6 This is a schematic diagram of a two-layer flap structure consisting of metal and soft rubber.

[0041] Figure 7 Inclined back panel and collection device. Detailed Implementation

[0042] To make the purpose, technical solution and advantages of this application clearer, the technical solution of the implementation of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The described implementation is a part of the implementation of this application, but not all of the implementation. The implementation described below with reference to the accompanying drawings is exemplary and intended to explain this application, and should not be construed as a limitation of this application. All other implementations obtained by those skilled in the art based on the implementation of this application without creative effort are within the scope of protection of this application. The implementation of this application will be described in detail below with reference to the accompanying drawings. The energy-absorbing target plate is mainly composed of: an array-type energy-absorbing flap (1); a knife-shaped column; an anti-impact tilting back plate (4); a projectile collection device; and a lightweight mobile platform (3). It realizes the projectile interception function and rapid movement capability, and improves the accurate positioning of the muzzle strike position. The structure of the array-type energy-absorbing target plate is shown in the figure. Figure 1 .

[0043] Taking bird strike tests as an example, the aim is to reduce the degree of damage to the bird's body by designing different structures, thereby making it easier to collect the bird's carcass. At the same time, by using some energy-absorbing and energy-reducing structures, the impact energy of the bird on the target plate can be reduced, thereby better maintaining the structural integrity of the target plate.

[0044] According to the energy balance equation, the energy of the thrown bird acting on the target can be divided into three parts:

[0045] Formula (1)

[0046] In the formula, It is the bird's body mass. It is the speed of the bird's body before it comes into contact with the flap. It is the energy consumed when the bird's body impacts the flapping board. It is the remaining speed of the bird's body after interacting with the flap. It is the quality of each flip panel, It is the speed generated by each flap when it impacts the bird's body.

[0047] According to formula (1), in order to reduce It can be increased Speed ​​and increase Starting from this aspect.

[0048] Increasing In terms of speed, the present invention has two designs: a knife-shaped column (2) and a flap structure.

[0049] Knife-shaped column (2): Made of high-strength steel, with the cutting edge facing the direction of the air cannon's throw. Its main function is to cut the projectile and suspend the energy-absorbing flap (1). It protects the overall integrity and reliability of the array-type energy-absorbing flap (1) assembly while reducing the overall weight; see knife-shaped column (2). Figure 2 .

[0050] The function of the flap structure is to allow the bird to pass through by flipping when it interacts with the bird's body, thereby reducing the bird's speed loss.

[0051] The main body of the array-type energy-absorbing flap (1) component is a 40*80CM square thin steel plate, which is suspended between blade-shaped columns (2) by a rotating shaft (11). When it flips, the soft rubber layer can also absorb some of the energy impact. See the energy-absorbing flap (1). Figure 3 .

[0052] Increasing In terms of the structure, the interconnected structure of each flap allows the flap structure above it to move when one flap structure moves, thus increasing the overall kinetic energy of the flap structure.

[0053] like Figure 4 As shown, when the bird strikes the fifth layer of flaps, it will cause the fourth, third, second, and first layer flaps to move as well, at which point n=5. Similarly, if the bird strikes the third layer of flaps, the flaps that move will be the second and first layer flaps above it, at which point n=3.

[0054] The bird's body passes through the arrayed energy-absorbing flaps (1) at a certain speed, leaving impact position information on the flaps. The position is then adjusted by the muzzle to achieve radial full-range impact on the engine. The impact position is as follows: Figure 5 As shown.

[0055] at the same time, The impact performance on the flapper is affected not only by the total impact energy but also by the impact duration. That is, the greater the total energy, the more pronounced the effect on the flapper; and the shorter the impact duration, the more pronounced the effect. To reduce... Regarding the effectiveness of the flap, this patent employs a two-layer flap structure of metal and soft rubber, such as... Figure 5 As shown, soft rubber has better elastic deformation capacity than metal plates, which prolongs the contact time between the flap structure and the bird's body, reduces the average pressure, and can more effectively protect the flap structure.

[0056] To better collect bird carcasses, a tilting backplate (4) and a collection device were added to the target plate model.

[0057] The anti-impact tilting backplate (4) is made of high-strength steel and equipped with reinforcing ribs (6) to intercept the target projectile. The tilting design of the tilting backplate (4) lowers the overall center of gravity, making the target interception safer and more reliable; the lightweight moving platform (3) uses hollow square steel as the main material, ensuring strength while reducing the overall weight, enabling the target to move quickly; after the projectile is intercepted by the tilting backplate (4), it falls into the projectile collection device. The tilting backplate (4) and the projectile collection device are shown in the figure. Figure 6 .

[0058] This application reduces weight through structural design, enabling rapid movement of the target plate;

[0059] The original design lacked an energy-absorbing structure, resulting in rigid contact between the projectile and the target plate, leading to high energy levels and a tendency for cracks or deformation. This new design utilizes a suspended array of flaps to absorb and buffer the energy generated during the collision, effectively reducing the energy generated and increasing the projectile's service life.

[0060] The original method involved difficult, cumbersome, and inefficient muzzle calibration. This new method effectively solves the problem of repetitive calibration, improves work efficiency, and reduces workload.

[0061] This solution can reduce the splashing after the projectile impact. By using a projectile collection device at the bottom for unified cleaning and centralized burial, it can prevent the occurrence of epidemics and diseases.

[0062] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An array-type energy-absorbing target plate, characterized in that, include: Supporting framework; Multiple blade-shaped columns (2) are fixed at intervals to the support frame, with their cutting edges facing the direction of the impactor being thrown; Multiple energy-absorbing flaps (1), which are rotatably suspended between adjacent blade-shaped columns (2) via a rotation axis (11) and arranged in a multi-layer array in the vertical direction, are configured to flip upon impact to allow the impacting object to pass through and absorb its kinetic energy. An inclined back plate (4) and a projectile collection box (1) are provided. The inclined back plate (4) is inclinedly disposed on the side of the array of energy-absorbing flaps (1) facing away from the impactor. The projectile collection box (1) is located below the inclined back plate (4) and is used to collect impactors that pass through the array of energy-absorbing flaps (1).

2. The array-type energy-absorbing target plate according to claim 1, characterized in that, The energy-absorbing flap (1) is a composite layer structure, including a soft rubber layer (12) facing the direction of the impact and a metal plate layer (13) facing away from the direction of the impact.

3. The array-type energy-absorbing target plate according to claim 2, characterized in that, The metal plate layer (13) of the upper energy-absorbing flap (1) extends downward and overlaps the lower energy-absorbing flap (1), so that when the first energy-absorbing flap (1) is hit by an impacting object and moves, it can drive the energy-absorbing flap (1) above it to move together.

4. The array-type energy-absorbing target plate according to claim 1, characterized in that, The blade-shaped column (2) is made of high-strength steel and its cutting edge is configured to cut impactors.

5. The array-type energy-absorbing target plate according to claim 1, characterized in that, The supporting frame is a lightweight mobile platform (3) made of hollow square steel.

6. The array-type energy-absorbing target plate according to claim 1, characterized in that, The inclined back plate (4) is a high-strength steel inclined back plate (4) with reinforcing ribs (6).

7. The array-type energy-absorbing target plate according to claim 2, characterized in that, The main body of the energy-absorbing flap (1) is a metal plate layer (13), the length of which is greater than the length of the soft rubber layer (12).

8. An impact testing method, employing an array-type energy-absorbing target plate as described in any one of claims 1 to 7, characterized in that, The method includes: Adjust the throwing direction of the impactor so that it hits a specific layer of the energy-absorbing flap (1) array; After the impacting object interacts with the energy-absorbing flap (1) and the inclined back plate (4) in sequence, it falls into the projectile collection box (1). The impact effect is evaluated by analyzing the impact position information left on the energy-absorbing flap (1) and the collected impact material.

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