A high-speed space fragment generation device

Abstract

The present invention discloses a high-speed space fragment generation device, and the whole device includes: a jet generation device for generating high-speed metal jets; a fragment interception device including two adjustable-speed motors and two disks that are opposite to each other and spaced apart by a distance. The output shafts of the two adjustable-speed motors are respectively fixedly connected to the centers of the two disks for driving the rotation of the disks. Circular jet through-holes penetrate the surfaces of the disks. The central axes of the jet through-holes are parallel to the central axes of the disks, and the central axes of the jet through-holes are directly opposite to the central axis of the jet generation device. These jet through-holes are used to pass the required space fragments, and the disks are used to intercept the required space fragments from the high-speed metal jets; and a control device that is respectively circuit-connected to the jet generation device and the adjustable-speed motors of the fragment interception device for controlling detonation, timing, and controlling the machine actions. The present invention has the characteristics of being more simple and safe.

Description

Technical Field

[0001] The present invention relates to the technical fields of aerospace and ordnance science and technology, and particularly to a high-speed space fragment generating device. Background Technique

[0002] The damage to the target can be completed by high-speed space fragments. In order to study the damage effect of a space weapon warhead on the target and study the kinematic performance and damage effect of the high-speed space fragments generated after its explosion, it is necessary to generate high-speed fragments on the ground to simulate high-speed space fragments for experiments.

[0003] Generally, the ordinary fragment test method can produce fragments with a maximum speed of 2000 m / s, while the speed of space fragments is as high as 8000 - 10000 m / s. Using the existing fragments to simulate space fragments cannot meet the requirements, and metal jets can be used to simulate high-speed space fragments. The existing jet forming technology is very mature, and the speed of the jet can reach 8000 - 12000 m / s, fully meeting the requirements of high-speed space fragments. Moreover, the speed and mass of each part of the jet can be obtained through numerical simulation or formula calculation, or can be obtained through experimental testing, laying the possibility for intercepting a certain mass of high-speed jet to generate space fragments.

[0004] In summary, the method of intercepting the jet to simulate high-speed space fragments can solve the problems in this technical field and is more convenient and safe. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-speed space fragment generating device to solve the problems raised in the above background technique.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A high-speed space fragment generating device, the whole device includes: a jet generating device, which is used to generate a high-speed metal jet; a fragment intercepting device, which includes two adjustable-speed motors and two disks that are opposite to each other and spaced apart by a distance. The output shafts of the two adjustable-speed motors are respectively fixedly connected to the centers of the two disks, and are used to drive the rotation of the disks; a circular jet through-hole penetrates through the surface of the disk, the central axis of the jet through-hole is parallel to the central axis of the disk, and the central axis of the jet through-hole is directly opposite to the central axis of the jet generating device. This jet through-hole is used to pass the required space fragments, and the disk is used to intercept the required space fragments from the high-speed metal jet; and a control device, which is respectively circuit-connected to the jet generating device and the adjustable-speed motors of the fragment intercepting device, and is used to control initiation, timing, and control the machine actions; wherein, the mass of the required space fragments is denoted as m, the fragment speed is denoted as v, the length of the fragment is denoted as δ, its position is denoted as x0, and the positions of its head end and tail end are x1 and x2 respectively, and the distances of the x1 and x2 positions from x0 are equal, both being When intercepting the required spatial fragment, it is necessary to control the rotation speeds, starting positions, and starting times of the two discs in the fragment interception device; the rotation speeds of the two discs are as follows: after the end of the spatial fragment passes through the lower surface of the disc, before the upper disc completely blocks the subsequent jet, the jet displacement distance is s, and the time used is Then the linear velocity of the jet through-hole on the upper disc must be greater than The rotation speed of the upper disc The time for the required spatial fragment to completely pass through the through-hole is To ensure that the fragment is not broken when moving in the through-hole, the linear velocity of the jet through-hole on the lower disc should be less than Rotation speed In the formula, d is the diameter of the jet through-hole, d s Is the diameter of the jet tail, D is the diameter of the disc, v j Is the jet head velocity, δ is the length of the required spatial fragment, a is the thickness of the disc; the starting positions of the two discs are as follows: the starting position of the upper disc is that the through-hole is directly opposite the center of the jet generating device; the jet through-hole of the lower disc needs to be deflected by an angle of θ = 2πn’t n , Is the time used for the lower disc to block the excess jet, l1 is the distance from the center x0 of the fragment with a speed of v to the jet head; due to jet accumulation, a head with a larger diameter is formed, and this part is removed, and the length l0 of the removed head; the starting times of the two discs are as follows: the starting time of the upper disc is t1, t1 is the time when the jet at the x2 position just passes through the lower end face of the upper disc, and the starting time of the lower disc is t2 - t n , t2 is the time when the jet at the x1 position just reaches the upper end face of the lower disc; satisfying the formula (t1 - t a )v j = H1 + l0 + l1 + δ - l a , (t2 - t a )v j = H1 + H2 + l0 + l1 - l a ; In the formula, H1 is the distance from the end of the jet generating device to the surface of the upper disc where the jet first passes through; H2 is the distance between the surfaces of the upper and lower discs where the jet first passes through, (t a , l a ) is the coordinate of the jet virtual origin.

[0007] According to the above technical solution, the jet generating device includes: a charge, a liner, and a detonator, and their central axes coincide. Among them, the liner and the charge are made into a whole, both the charge and the liner are rotating bodies, the detonator is placed on the charge, and the control device is electrically connected to the detonator for controlling the detonation; the material of the liner includes any one of copper, aluminum, and titanium.

[0008] According to the above technical solution, the two adjustable-speed motors are located between the two disks, and the output shafts of the adjustable-speed motors are fixedly connected to the disks by keys.

[0009] According to the above technical solution, the materials of the two disks are both steel.

[0010] According to the above technical solution, the thickness of the disk can ensure that it will not be penetrated by the jet while blocking the jet; since the jet will penetrate the steel disk, the disk thickness should at least ensure that it will not be penetrated, so the disk thickness can be estimated by the penetration depth formula of the jet penetrating the target plate; among them, the depth of the jet penetrating the target plate is approximately calculated by the one-dimensional hydrodynamic penetration model as:

[0011]

[0012] In the formula, P is the penetration depth of the jet, l is the length of the jet, which can be obtained by X-ray photography, ρ j and ρ t are the density of the jet liner and the density of the disk material, respectively.

[0013] According to the above technical solution, the shape of the charge is cylindrical.

[0014] According to the above technical solution, the control device includes a detonator, a timer and a controller; the controller is electrically connected to the two adjustable-speed motors, and the detonator is electrically connected to the detonator for controlling the detonation.

[0015] According to the above technical solution, the controller is a single-chip microcomputer of the stm32 series.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are: in the embodiment of the present invention, when the charge is detonated by the detonator, the timer starts timing. The explosion energy crushes the liner to form a high-speed metal jet. After the jet passes through the jet through-hole of the upper disk, the controller controls the disk to rotate, cuts off the rear part of the jet, and then when the jet where the required fragment is located is about to pass through the lower jet hole, the controller controls the adjustable-speed motor to rotate the lower disk so that the head jet cannot pass through; in this way, by presetting the starting positions of the two turntables, the starting time and rotation speed of the disks, any section of the jet can be intercepted as the test object. This high-speed space fragment generation device has a simple structure, is efficient and accurate, and solves the problem of difficult simulation of space fragments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0018] Figure 1is the front view structural schematic diagram of the present invention;

[0019] Figure 2 is the top view structural schematic diagram of the disc of the present invention;

[0020] Figure 3 is the schematic diagram of the specific implementation manner of the present invention;

[0021] Figure 4 is the test layout diagram of the pull - off method used in the jet test of the present invention;

[0022] In the figure: 1. Jet generating device; 2. Fragment intercepting device; 3. Control device; 1 - 1. Charge; 1 - 2. Liner; 1 - 3. Detonator; 2 - 1. Adjustable - speed motor; 2 - 2. Disc; 3 - 1. Initiator; 3 - 2. Timer; 3 - 3. Controller. Specific implementation manner

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0024] Please refer to Figures 1-4 , the present invention provides a technical solution: A high - speed space fragment generating device, the overall device includes: a jet generating device 1, a fragment intercepting device 2, and a control device 3; the jet generating device is used to generate high - speed metal jets; the fragment intercepting device 2 includes two adjustable - speed motors 2 - 1 and two discs 2 - 2 that are opposite to each other and spaced apart by a certain distance. The output shafts of the two adjustable - speed motors 2 - 1 are fixedly connected to the centers of the two discs 2 - 2 respectively, and are used to drive the rotation of the discs 2 - 2; the surface of the disc 2 - 2 is penetrated with a circular jet through - hole, the central axis of the jet through - hole is parallel to the central axis of the disc 2 - 2, and the central axis of the jet through - hole is directly opposite to the central axis of the jet generating device 1. This jet through - hole is used to pass the required space fragments, and the disc 2 - 2 is used to intercept the required space fragments from the high - speed metal jets; the control device 3 is electrically connected to the jet generating device 1 and the fragment intercepting device 2 respectively, and is used to control initiation, timing, and control the machine action; the jet generating device 1 and the fragment intercepting device 2 have parallel central axes; the control device 3 is electrically connected to the jet generating device 1 and the adjustable - speed motor 2 - 1 of the fragment intercepting device 2 respectively, and is used to control initiation, timing, and control the machine action; among them, the mass of the required space fragment is denoted as m, the fragment speed is denoted as v, the length of the fragment is denoted as δ, its position is denoted as x0, and the positions of its head and tail are x1 and x2 respectively, and the distances from the positions x1 and x2 to x0 are equal, both being When intercepting the required spatial fragments, it is necessary to control the rotational speed, starting position, and starting time of the two discs 2-2 in the fragment interception device 2; the rotational speeds of the two discs 2-2 are as follows: after the end of the spatial fragment passes through the lower surface of the disc 2-2, before the upper disc 2-2 completely blocks the subsequent jet, the displacement distance of the jet is s, and the time taken is Then the linear velocity of the jet through-hole on the upper disc 2-2 must be greater than The rotational speed of the upper disc 2-2 The time for the required spatial fragment to completely pass through the through-hole is To ensure that the fragment is not broken when moving in the through-hole, the linear velocity of the jet through-hole on the lower disc 2-2 should be less than Rotational speed In the formula, d is the diameter of the jet through-hole, d s Is the diameter of the jet tail, D is the diameter of the disc 2-2, v j Is the velocity of the jet head, δ is the length of the required spatial fragment, a is the thickness of the disc 2-2; the starting positions of the two discs 2-2 are as follows: the starting position of the upper disc 2-2 is that the through-hole is directly opposite the center of the jet generating device 1; the jet through-hole of the lower disc 2-2 needs to be deflected by an angle θ = 2πn’t n , Is the time used for the lower disc 2-2 to block the excess jet, l1 is the distance from the center x0 of the fragment with a velocity of v to the jet head; due to jet accumulation, a head with a larger diameter is formed, and this part is removed, and the length l0 of the removed head; the starting times of the two discs 2-2 are as follows: the starting time of the upper disc 2-2 is t1, t1 is the time when the jet at the x2 position just passes through the lower end face of the upper disc 2-2, and the starting time of the lower disc 2-2 is t2 - t n , t2 is the time when the jet at the x1 position just reaches the upper end face of the lower disc 2-2; satisfying the formula (t1 - t a )v j = H1 + l0 + l1 + δ - l a , (t2 - t a )v j = H1 + H2 + l0 + l1 - l a ; In the formula, H1 is the distance from the end of the jet generating device 1 to the surface where the jet first passes through on the upper disc 2-2; H2 is the distance between the surfaces where the jet first passes through on the upper and lower discs 2-2, (t a , l a ) is the coordinate of the jet virtual origin.

[0025] The jet generating device 1 includes: a charge 1-1, a liner 1-2, and a detonator 1-3. The central axes of the three coincide. Among them, the liner 1-2 and the charge 1-1 are made into an integral body. Both the charge 1-1 and the liner 1-2 are of rotational symmetry. The detonator 1-3 is placed on the charge 1-1. The control device 3 is electrically connected to the detonator 1-3 for controlling the initiation; the material of the liner 1-2 includes any one of copper, aluminum, and titanium.

[0026] Two variable-speed motors 2-1 are located between two disks 2-2. The output shaft of the variable-speed motor 2-1 is fixedly connected to the disk 2-2 by a key.

[0027] Both disks 2-2 are made of steel.

[0028] The thickness of the disk 2-2 can ensure that it will not be penetrated by the jet while blocking the jet; since the jet will penetrate the steel disk, the disk thickness should at least ensure that it will not be penetrated. Therefore, the disk thickness can be estimated by the penetration depth formula of the jet penetrating the target plate; among them, the depth of the jet penetrating the target plate is approximately calculated using a one-dimensional hydrodynamic penetration model as:

[0029]

[0030] In the formula, P is the penetration depth of the jet, l is the length of the jet, which can be obtained by X-ray photography, ρ j and ρ t are the density of the jet liner and the density of the disk material, respectively.

[0031] The shape of the charge 1-1 is cylindrical.

[0032] The control device 3 includes a detonator 3-1, a timer 3-2, and a controller 3-3; the controller 3-3 is electrically connected to the two variable-speed motors 2-1, and the detonator 3-1 is electrically connected to the detonator 1-3 for controlling the initiation; the function of the detonator 3-1 is to transmit an electrical signal to the detonator to detonate the charge after the entire system is started. The function of the timer 3-2 is to time. The functions of the controller 3-3 are as follows: ① allowing the user to preset the start time and stop time of the two variable-speed motors; ② allowing the user to set the rotation speed and change form of the variable-speed motors; ③ when the timer reaches the preset time, the controller controls the variable-speed motors to rotate through an electrical connection. The three components of the control device 3 are electronic components, and there is no specific positional relationship between them. The connection method between the three is electrical connection, and they can be integrated.

[0033] The controller 3-3 is a single-chip microcomputer of the stm32 series.

[0034] The following gives a method of using this device to illustrate its feasibility:

[0035] When using the examples of the present invention, it is necessary to preset the starting position, starting speed, and rotation time of the turntable. These parameters need to be calculated based on the explosive, liner, the height from the mouth of the liner to the first disc (stand-off distance H1), the height from the upper surface of the second disc to the upper surface of the first disc, and the mass and speed of the required intercepted fragments, etc. These processes will be reflected in the following steps. The specific implementation steps of this invention patent are as follows:

[0036] Step 1: Determine the liner, charge material, and size parameters used in the experiment (the sizes of the charge and the liner are determined by the user according to needs, and it is necessary to refer to the design manual of shaped charges to design the caliber, length, cone angle, etc. of the shaped charge). Using X-ray photography velocity measurement technology, measure the jet distribution law V j = ez + c of the jet generation device used in the experiment, and thus obtain the head velocity v j and the tail velocity v s of the jet. According to the jet characteristics on the X-ray film and characteristics such as the image magnification factor, calculate the diameter d s of the tail. Since the jet accumulates to form a head with a larger diameter, this part is removed, and calculate the head diameter d j of the remaining part of the jet, as well as the length l0 of the removed head (the calculation method of length: measure the jet length on the X-ray negative film and divide by the magnification factor to obtain the actual length. The calculation method of diameter: based on the assumption that the jet cross-section is circular, measure the jet diameter on the X-ray negative film and divide by the magnification factor to obtain the actual diameter of the jet) and the total length l of the jet. See Appendix Figure 3 .

[0037] The following gives the specific method of X-ray testing used in the examples of the present invention:

[0038] In this example, the testing method is the pull-off method. The pull-off method uses a pulsed X-ray camera to photograph the state of the jet after being pulled off (at least two groups for each shot), find the corresponding fractured jet particles and measure their positions z1, z2, z3, …, and according to the distance difference Δ z and the time difference Δ t , the velocity value V j of each particle can be obtained, so as to obtain a method of the velocity distribution curve at a certain moment in the coordinate system V j -z. The schematic diagram of the experiment is shown in Appendix Figure 4 . To ensure that the image is not distorted, the central axis of the charge itself should be coaxial with the shooting central axis, the film cassette should have good parallelism with the central axis of the charge, and the two films should be arranged staggeredly according to the delay time, so as to make the film receive all the jet particles as much as possible. Before shooting, accurately measure the actual distance z b from the upper end of the film to the mouth of the liner. Shoot three fractured jets for each group. Then perform data processing.

[0039] (1) Measure the image magnification factor K. Accurately measure the distance L1 from the film cassette to the X-ray tube and the distance L2 from the projectile axis to the X-ray tube, then

[0040]

[0041] Or take a pre-shot, accurately measure the characteristic dimension L of the scale image taken, and measure its actual dimension L0. Then

[0042]

[0043] (2) Particle numbering. Find the corresponding fractured jet particles on two films taken at different times with the same propelling charge, and number them one by one starting from the head particle on both films.

[0044] (3) Measure the spatial position z of the particles. Measure the distances y1, y2, y3,... from the front end of each particle to the marking line on the two films respectively, fill them into the calculation table according to the particle order, calculate the actual distance y / K from the front end of the particle to the marking line, and calculate the actual distance from the front end of each particle to the liner mouth according to the following formula:

[0045]

[0046] (4) Calculate the particle velocity V j . According to the actual distances z1, z2, z3,... from the corresponding particles on different films measured previously to the liner mouth, and according to the time difference Δt between the exposure times t1 and t2 of different films, find the velocity of each particle (assuming that each microelement of the jet and the fractured jet particles move at a constant speed and are not affected by air resistance during movement)

[0047]

[0048] (5) Find the positions of the particles at a specific time T. According to the assumption that the velocity of the jet particles remains unchanged, find the position z of the particles captured in the experiment at the specific time T T . This specific time is generally selected as an integer value near the average value of the shooting times.

[0049] z T = z - V j (t - T)

[0050] (6) Plot the V j -z T curve and find the velocity equation. The origin of the coordinate system is the position of the liner mouth of the shaped charge. Mark the positions of the points of each particle in the figure, and fit them into a straight line by the graphical method or the least squares method to find the velocity distribution equation of the jet

[0051] V j = ez + c

[0052] In the formula, e is the slope of the straight line, c is the intercept of the straight line on the V j axis, and z is the position of a point on the jet (i.e., the actual distance from this point to the mouth of the liner).

[0053] (7) Obtain the head velocity and tail velocity of the projectile. Respectively obtain the average head velocity and tail velocity of the three projectiles, and draw the effective range of the determined curve on the coordinate graph.

[0054] The virtual origin coordinates (t a , z a ) of the jet can be obtained by using the pull-off method and are determined by the following two formulas:

[0055]

[0056]

[0057] Step 2: Process the jet. According to the PER theory, the velocity of the jet always decreases monotonically from the head to the tail, and the mass of the jet (excluding the head) always increases monotonically. Therefore, the jet after removing the head is processed into a frustum of a cone with a linearly increasing diameter and a linearly decreasing velocity. The density of the jet can be considered equal to the density ρ of the liner, see Figure 3 .

[0058] Step 3: According to the fragment mass m and fragment velocity v selected as needed, calculate the position x0 of the fragment (x0 is the position of the selected fragment segment (see attachment Figure 3 ), and similarly x1 and x2 also represent positions). The formula for calculating the fragment velocity is where l is the total length of the jet, and l1 is the distance from the center x0 of the fragment with velocity v to the head of the jet; the formula for calculating the length δ of the fragment is r2 are the radii of the jet at x1 and x2 respectively, and the positions x1 and x2 are equidistant from x0, both being From this, δ can be calculated.

[0059] Step 4: Use the virtual origin method to calculate the movement time of the jet: Assume that the virtual origin coordinates of the jet are (t a , l a ) (in the theory of the quasi-constant length of the shaped charge jet, it is considered that a virtual origin can be assumed, which is the point source from which all jets are emitted, and the jet velocity at this position is 0. In the calculation, it is considered that the head of the jet starts from the virtual source point and moves at a constant speed, and the displacement and time lead from the virtual source point of the jet need to be considered when calculating the time). t1 is the time when the jet at the x2 position just passes through the lower end face of the upper disk and satisfies the formula (t1 - t a )v j = H1 + l0 + l1 + δ - l a (l in this formulaa is the virtual coordinate of the jet. t2 is the time when the jet at the x1 position just reaches the upper end face of the lower disk, and it satisfies the formula: (t2 - t a )v j = H1 + H2 + l0 + l1 - l a , in the above two formulas, H2 is the distance between the same positions of the upper and lower disks (see attachment Figure 1 ).

[0060] Step Five: Set the rotation speed of the disk. Theoretically, the rotation speed of the upper disk should be such that the remaining jets are blocked immediately after the x2 position passes, and subsequent jets are no longer allowed to pass. This is obviously impossible. According to the allowable error requirements, it is set that after x2 passes through the lower surface of the upper disk and before the upper disk completely blocks the subsequent jets, the jet displacement distance is s, and the time used is The linear velocity of the jet through-hole on the turntable must be greater than The rotation speed is greater than In the formula, D is the diameter of the disk. Based on this, the disk rotation speed is set. After the fragment passes through, it is necessary for the upper disk to decelerate in a very short time to prevent the jet from passing through a second time.

[0061] When Disk 2 starts, it blocks the head jet. When x1 just arrives, the jet is exactly aligned with the jet through-hole. Therefore, the starting speed should not be too large to prevent the jet from passing through multiple times, and it should not be too small otherwise it is very difficult to set the initial position of the lower disk. The time for the fragment to completely pass through the through-hole is To ensure that the fragment is not broken when moving in the through-hole, the through-hole linear velocity should be at least less than The rotation speed should not be greater than

[0062] Step Six: Set the starting position of the disk: The starting position of the upper disk is that the through-hole is directly opposite the center of the liner. The through-hole of the lower disk needs to be deflected by an angle of θ = 2πn't, where n' is the rotation speed of the lower disk set in Step Six, is the time used to block the excess jets.

[0063] Step Seven: Calculate the starting times of the upper and lower disks: The starting time of the upper disk is t1, and the starting time of the lower disk is t2 - t n .

[0064] Step Eight: Input the starting times, rotation speeds and their change modes of the upper and lower disks into the controller of the device.

[0065] Step Nine: Install the jet generating device, connect the initiator to the detonator, connect the two adjustable-speed motors to the controller respectively, and start timing when the detonator explodes. Detonate the detonator to obtain the required spatial fragments.

[0066] In the embodiment of the present invention, while the detonator 1-3 is connected to the detonator 3-1 to detonate the charge 1-1, the timer 3-2 starts timing. The explosive energy crushes the liner 1-2 to form a high-speed metal jet. After the jet segment where the required fragments are located just passes through the upper disk 2-2, the controller 3-3 controls the adjustable-speed motor 2-1 to which the upper disk 2-2 belongs to rotate the upper disk 2-2, so that the jet above the required fragments is blocked; then when the remaining jet is about to reach the lower disk 2-2, the controller 3-3 controls the adjustable-speed motor 2-1 to which the lower disk 2-2 belongs to rotate the lower disk 2-2 to block the front segment of the jet and just pass through the required fragments; this enables the user to control the intercepted spatial fragments according to their own needs. This high-speed spatial fragment generating device has a simple structure, is efficient and accurate, and solves the problem of difficult testing of spatial fragments.

[0067] It should be noted that in the application examples given above, since the upper and lower disks 2-2 are respectively controlled by adjustable-speed motors, the user can set the starting position, starting time and rotation speed of the adjustable-speed motor according to their own needs and obtain the expected spatial fragments. Similarly, the user can use the upper disk 2-2 to block the first half of the jet and the lower disk 2-2 to block the second half of the jet, so that the usage of the present invention is diverse and not limited to the examples provided in this specification.

[0068] It should also be noted that the user can calculate the test jet by numerical simulation to further accurately determine each parameter required, thereby improving the speed accuracy and quality accuracy of the intercepted fragments.

[0069] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0070] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-speed space fragment generation device, characterized in that: The overall device includes: A jet generating device (1) for generating a high-speed metal jet; A fragment interception device (2) including two adjustable-speed motors (2-1) and two disks (2-2) that are opposite to each other and spaced apart by a distance. The output shafts of the two adjustable-speed motors (2-1) are respectively fixedly connected to the centers of the two disks (2-2) to drive the rotation of the disks (2-2). Circular jet through-holes penetrate the surfaces of the disks (2-2). The central axis of the jet through-hole is parallel to the central axis of the disk (2-2), and the central axis of the jet through-hole is directly opposite to the central axis of the jet generating device (1). This jet through-hole is used to pass the required spatial fragments, and the disks (2-2) are used to intercept the required spatial fragments from the high-speed metal jet; and A control device (3) that is respectively circuit-connected to the jet generating device (1) and the adjustable-speed motors (2-1) of the fragment interception device (2) for controlling initiation, timing, and controlling the machine operation; Among them, the mass of the required space fragment is denoted as m, the fragment velocity is denoted as v, the length of the fragment is denoted as δ, its position is denoted as x0, the positions of its head and tail ends are x1 and x2 respectively, and the distances of the positions x1 and x2 from x0 are equal, both being When intercepting the required space fragment, it is necessary to control the rotational speeds, starting positions, and starting times of the two discs (2-2) in the fragment intercepting device (2); The rotational speeds of the two disks (2-2) are: After the end of the space-breaking tail passes through the lower surface of the disc (2-2), the displacement distance of the jet before the upper disc (2-2) completely blocks the subsequent jet is s, and the time taken is Then the linear velocity of the jet through-hole on the upper disc (2-2) must be greater than The rotational speed of the upper disc (2-2) The time for the required spatial fragment to completely pass through the through-hole is To ensure that the fragment is not broken when moving in the through-hole, the linear velocity of the jet through-hole on the lower disk (2-2) should be less than Rotational speed In the formula, d is the diameter of the jet through-hole, d s is the diameter of the jet tail, D is the diameter of the disk (2-2), v j is the velocity of the jet head, δ is the length of the required spatial fragment, and a is the thickness of the disk (2-2); The starting positions of the two disks (2-2) are: The starting rotation position of the upper disk (2-2) is where the through hole is aligned with the center of the jet generating device (1); the jet through hole of the lower disk (2-2) needs to be deflected by an angle of θ = 2πn’t n , is the time used for the lower disk (2-2) to block the excess jet, l1 is the distance from the center x0 of the fragment with a speed of v to the head of the jet; due to the jet accumulation, a head with a larger diameter is formed, and this part is removed, and the length of the removed head is l0; The starting times of the two disks (2-2) are: The starting rotation time of the upper disk (2-2) is t1, where t1 is the time when the position of the jet x2 just passes through the lower end face of the upper disk (2-2), and the starting rotation time of the lower disk (2-2) is t2 - t n , where t2 is the time when the position of the jet x1 just reaches the upper end face of the lower disk (2-2); Satisfy the formula (t1 - t a )v j = H1 + l0 + l1 + δ - l a , (t2 - t a )v j = H1 + H2 + l0 + l1 - l a ; where, H1 is the distance from the end of the jet generating device (1) to the surface on the upper disk (2 - 2) where the jet first passes through; H2 is the distance between the surfaces on the upper and lower disks (2 - 2) where the jet first passes through, (t a , l a ) are the coordinates of the virtual origin of the jet.

2. The high-speed space fragment generating device according to claim 1, wherein: The jet generating device (1) includes: a charge (1-1), a liner (1-2), and a detonator (1-3). Their central axes coincide. Among them, the liner (1-2) and the charge (1-1) are made into an integral body. The charge (1-1) and the liner (1-2) are both of rotational symmetry. The detonator (1-3) is placed on the charge (1-1). The control device (3) is electrically connected to the detonator (1-3) for controlling initiation. The material of the liner (1-2) includes any one of copper, aluminum, and titanium.

3. A high-speed spatial fragment generation device according to claim 1, characterized in that: The two adjustable-speed motors (2-1) are located between the two disks (2-2). The output shafts of the adjustable-speed motors (2-1) are fixedly connected to the disks (2-2) through keys.

4. A high-speed space fragment generating device according to claim 1, characterized in that: The materials of the two disks (2-2) are both steel.

5. The high-speed spatial fragment generation device according to claim 1, characterized in that: The thickness of the disk (2-2) can ensure that it will not be penetrated by the jet while blocking the jet. Since the jet will penetrate the steel disk, the disk thickness should at least ensure that it will not be penetrated. Therefore, the disk thickness can be estimated by the penetration depth formula of the jet penetrating the target plate. Among them, the depth of the jet penetrating the target plate is approximately calculated using a one-dimensional hydrodynamic penetration model as: Wherein, P is the penetration depth of the jet, l is the length of the jet, which can be obtained by X-ray photography, ρ j and ρ t are the density of the jet liner and the density of the disc material, respectively.

6. The high-speed spatial fragment generating device according to claim 2, characterized in that: The shape of the charge (1-1) is cylindrical.

7. The high-speed spatial fragment generating device according to claim 2, characterized in that: The control device (3) includes a detonator (3-1), a timer (3-2), and a controller (3-3). The controller (3-3) is electrically connected to the two adjustable-speed motors (2-1). The detonator (3-1) is electrically connected to the detonator (1-3) for controlling initiation.

8. A high-speed space fragment generation device according to claim 7, characterized in that: The controller (3-3) is a single-chip microcomputer of the stm32 series.

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