Coiled launcher re-connected cannon structure and electromagnetic performance analysis method thereof

Abstract

The invention belongs to the field of ultrahigh-speed electromagnetic launch design analysis, and particularly discloses a winding type launcher re-connected cannon structure and an electromagnetic performance analysis method of the winding type launcher re-connected cannon structure. The excitation source drives the coil structure and the emitter; the driving coil structure is connected with the excitation source and is used for generating electromagnetic force under the excitation of the excitation source so as to drive the emitter to emit; the emitter is a self-closing multilayer metal coil panel. According to the reconnection gun structure, the through-current capability of the emitter can be greatly enhanced, the electromagnetic thrust peak value generated by the reconnection gun structure and the emitting speed of the emitter are further improved, and the overall performance of the reconnection gun is improved.

Description

Technical Field

[0001] This application belongs to the field of ultra-high-speed electromagnetic launch design and analysis. More specifically, it relates to a coiled launcher reconnecting gun structure and its electromagnetic performance analysis method. Background Art

[0002] The traditional launch mode using gunpowder as the launch energy has a series of drawbacks such as low efficiency, high noise, strong vibration, and a theoretical speed limit. In this context, electromagnetic launch technology has emerged. Electromagnetic launch technology directly converts electromagnetic energy into the kinetic energy of the launcher, featuring high efficiency, low noise, high controllability, and being unrestricted by the stagnation sound speed, showing broad prospects in the field of ultra-high-speed launch.

[0003] The reconnecting gun belongs to the reconnecting type of launch. Its principle is to generate eddy currents in a metal launcher through electromagnetic induction, and the electromagnetic force generated by the interaction between the eddy currents and the magnetic field of the hollow coil disk drives the launcher to accelerate. The reconnecting gun is one of the most promising launch modes in the field of electromagnetic launch, characterized by strong pulse excitation, strong electromagnetic coupling, and high launch kinetic energy. Compared with rail launch, reconnecting launch has advantages such as no friction, no ablation, and the ability to launch large-mass payloads; compared with coil launch, it has advantages such as high thrust and high efficiency, making it the most valuable launch mode for research, especially suitable for ultra-high-speed launch.

[0004] However, in the existing reconnecting gun structures, the launcher usually uses a solid metal plate. Due to the existence of the eddy current skin effect, the eddy current distribution inside the launcher is prone to be uneven, resulting in weak current-carrying capacity of the launcher, and further leading to low thrust peak of the electromagnetic force and low exit velocity of the launcher. Therefore, the performance of the reconnecting gun needs to be improved.

[0005] Therefore, how to better design the reconnecting gun structure and improve its performance has become an urgent technical problem in the industry. Summary of the Invention

[0006] Aiming at the defects of the existing technology, the purpose of this application is to better design the reconnecting gun structure and improve its performance, aiming to solve the problems that in the existing reconnecting gun structure, the current-carrying capacity of the launcher is weak, resulting in low thrust peak of the electromagnetic force and low exit velocity of the launcher, and the performance of the reconnecting gun needs to be improved.

[0007] To achieve the above purpose, in the first aspect, this application provides a coiled launcher reconnecting gun structure, including: An excitation source, a driving coil structure, and a launcher; The driving coil structure is connected to the excitation source and is used to generate electromagnetic force under the excitation of the excitation source to drive the launcher to launch; the launcher is a self-closed multi-layer metal coil disk.

[0008] Optionally, the driving coil structure includes two coaxially arranged hollow coil discs in series or parallel; the multi-layer metal coil discs are arranged in parallel between the two hollow coil discs.

[0009] Optionally, the two hollow coil discs have the same shape, size and number of turns.

[0010] Optionally, the driving coil structure is a copper coil structure, and the metal coil disc is an aluminum coil disc.

[0011] In a second aspect, the present application provides an electromagnetic performance analysis method applied to the reconnection gun structure of any one of the foregoing winding type emitters, including: Determine the equivalent circuit equations of the reconnection gun structure at each discharge stage of the excitation source; Analyze each of the equivalent circuit equations to obtain the current data model and thrust data model of the reconnection gun structure at each discharge stage.

[0012] Optionally, the excitation source is a first excitation source including a first capacitor discharge stage, a first diode branch commutation stage and a diode branch freewheeling stage; each of the equivalent circuit equations includes a first equivalent circuit equation for the first capacitor discharge stage, a second equivalent circuit equation for the first diode branch commutation stage and a third equivalent circuit equation for the diode branch freewheeling stage; Correspondingly, the analyzing each of the equivalent circuit equations to obtain the current data model and thrust data model of the reconnection gun structure at each discharge stage includes: Using the mutual inductance between the driving coil structure and the emitter, the self-inductance of the driving coil structure, the self-inductance of the emitter, the initial charging voltage and capacitance value of the capacitor in the first excitation source, analyze the first equivalent circuit equation to obtain the current data model and thrust data model of the reconnection gun structure in the first capacitor discharge stage; Using the mutual inductance between the driving coil structure and the emitter, the self-inductance of the driving coil structure, the self-inductance of the emitter, as well as the freewheeling resistance, the initial charging voltage and capacitance value of the capacitor in the first excitation source, respectively analyze the second equivalent circuit equation and the third equivalent circuit equation to obtain the current data model and thrust data model of the reconnection gun structure in the first diode branch commutation stage and the diode branch freewheeling stage.

[0013] Optionally, the excitation source is a second excitation source including a second capacitor discharge stage and a second diode branch commutation stage; each of the equivalent circuit equations includes a fourth equivalent circuit equation for the second capacitor discharge stage and a fifth equivalent circuit equation for the second diode branch commutation stage; Correspondingly, parsing each of the equivalent circuit equations to obtain the current data model and the thrust data model of the reconnecting gun structure in each discharge stage, including: Parsing the fourth equivalent circuit equation by using the mutual inductance between the drive coil structure and the emitter, the self-inductance of the drive coil structure, the self-inductance of the emitter, the initial charging voltage and capacitance value of the capacitor in the second excitation source, to obtain the current data model and the thrust data model of the reconnecting gun structure in the second capacitor discharge stage; Parsing the fifth equivalent circuit equation by using the mutual inductance between the drive coil structure and the emitter, the self-inductance of the drive coil structure, the self-inductance of the emitter, as well as the freewheeling resistance, the initial charging voltage and capacitance value of the capacitor in the second excitation source, to obtain the current data model and the thrust data model of the reconnecting gun structure in the second diode branch commutation stage.

[0014] Optionally, the drive coil structure is two coaxially arranged in series hollow coil discs, and the self-inductance of the drive coil structure is determined based on the self-inductance of each hollow coil disc and the mutual inductance between the two hollow coil discs; the mutual inductance between the drive coil structure and the emitter is determined based on the mutual inductance between each hollow coil disc and the emitter.

[0015] Optionally, the drive coil structure is two coaxially arranged in parallel hollow coil discs, and the shapes, sizes and turns of the two hollow coil discs are all the same; the self-inductance of the drive coil structure is determined based on the self-inductance of any one of the hollow coil discs and the mutual inductance between the two hollow coil discs; the mutual inductance between the drive coil structure and the emitter is determined based on the mutual inductance between each hollow coil disc and the emitter.

[0016] Optionally, after parsing each of the equivalent circuit equations to obtain the current data model and the thrust data model of the reconnecting gun structure in each discharge stage, the method further includes: Performing thrust peak analysis according to the thrust data model of the reconnecting gun structure in each discharge stage to determine the electromagnetic coupling information corresponding to the highest thrust peak; Performing type selection analysis on the capacitor in the excitation source according to the electromagnetic coupling information to determine the optimal capacitance value configuration model of the capacitor.

[0017] In a third aspect, the present application provides an electronic device, including: at least one memory for storing a program; at least one processor for executing the program stored in the memory, and when the program stored in the memory is executed, the processor is used to execute the method described in the first aspect or any one of the possible implementation manners of the first aspect.

[0018] In a fourth aspect, the present application provides a computer-readable storage medium storing a computer program, which, when running on a processor, causes the processor to execute the method described in the first aspect or any possible implementation of the first aspect.

[0019] In a fifth aspect, the present application provides a computer program product, which, when running on a processor, causes the processor to execute the method described in the first aspect or any possible implementation of the first aspect.

[0020] Generally speaking, compared with the prior art, the above technical solution conceived by the present application has the following beneficial effects: A coiled emitter reconnection gun structure and its electromagnetic performance analysis method provided by the present application, by deeply considering the relationship between the emitter structure and the eddy current skin effect generated by it, cleverly designs the emitter into a self-closed multi-layer metal coil disk structure. Since the radius of the metal coil in the coiled coil emitter is always smaller than the eddy current skin depth generated by it, the eddy current skin effect of the emitter can be ignored, and the internal eddy current distribution and current density of the emitter will become uniform. As a result, the current-carrying capacity of the emitter can be greatly enhanced, thereby increasing the peak value of the electromagnetic force thrust generated by the reconnection gun structure and the exit velocity of the emitter, and improving the overall performance of the reconnection gun. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of a coiled emitter reconnection gun structure provided by an embodiment of the present application; Figure 2 is a schematic diagram of a structural simulation model of a coiled emitter and a drive coil structure in a reconnection gun structure provided by an embodiment of the present application; Figure 3 is a schematic diagram of a structural simulation model of an existing solid plate emitter reconnection gun provided by an embodiment of the present application; Figure 4 is a schematic diagram of a simulation result of the internal current density distribution of the emitter of an existing solid plate emitter reconnection gun provided by an embodiment of the present application; Figure 5 is a schematic diagram of a simulation result of the internal current density distribution of the emitter of a coiled emitter reconnection gun structure provided by an embodiment of the present application; Figure 6 is a schematic diagram for comparing the thrust curves of a coiled emitter reconnection gun and a solid emitter reconnection gun provided by an embodiment of the present application; Figure 7 is a schematic diagram for comparing the acceleration curves of a single-stage coiled emitter reconnection gun and a single-stage solid emitter reconnection gun provided by an embodiment of the present application; Figure 8It is a schematic flowchart of the electromagnetic performance analysis method for the reconnection gun structure of the wound launcher provided by the embodiment of the present application; Figure 9 It is a schematic circuit structure diagram of the reconnection gun structure of the wound launcher under the series connection of hollow coil disks; Figure 10 It is a schematic curve diagram of the induced voltage and Ohm voltage of the launcher loop in the reconnection gun structure of the wound launcher provided by the embodiment of the present application; Figure 11 It is a schematic curve diagram of the equivalent relationship of the launcher loop in the reconnection gun structure of the wound launcher provided by the embodiment of the present application; Figure 12 It is a schematic curve diagram of the induced voltage and Ohm voltage of the launcher loop of the existing solid plate reconnection gun provided by the embodiment of the present application; Figure 13 It is a schematic curve diagram of the mismatch of the equivalent relationship of the launcher loop of the existing solid plate reconnection gun provided by the embodiment of the present application; Figure 14 It is a schematic equivalent circuit diagram of the reconnection gun structure of the wound launcher under the series connection of hollow coil disks; Figure 15 It is a schematic comparison curve diagram of the actual external voltage and the derived voltage of the reconnection gun structure of the wound launcher under the series connection of hollow coil disks; Figure 16 It is a schematic circuit structure diagram of the reconnection gun structure of the wound launcher under the parallel connection of hollow coil disks; Figure 17 It is a schematic equivalent circuit diagram of the reconnection gun structure of the wound launcher under the parallel connection of hollow coil disks; Figure 18 It is a schematic comparison curve diagram of the actual external voltage and the derived voltage of the reconnection gun structure of the wound launcher under the parallel connection of hollow coil disks; Figure 19 It is a schematic diagram of the pulse circuit topology structure of the type-I PFN excitation source provided by the embodiment of the present application; Figure 20 It is a schematic equivalent circuit diagram of the reconnection gun of the wound launcher during the capacitor discharge stage of the type-I PFN excitation source; Figure 21 It is a schematic diagram of the result of the current depression existing in the reconnection gun of the wound launcher provided by the embodiment of the present application; Figure 22 It is a schematic diagram of the result of the current depression compensation for the reconnection gun of the wound launcher provided by the embodiment of the present application; Figure 23It is a schematic diagram of the equivalent circuit of the coiled launcher reconnecting gun provided by the embodiment of the present application during the commutation stage of the diode branch of the type-I PFN excitation source; Figure 24 It is a schematic diagram of the equivalent circuit of the coiled launcher reconnecting gun provided by the embodiment of the present application during the freewheeling stage of the diode branch of the type-I PFN excitation source; Figure 25 It is one of the schematic diagrams of the comparison curves between the actual current data and the three-stage analytical current data in the coiled launcher reconnecting gun under different initial velocity conditions with the type-I PFN excitation source; Figure 26 It is one of the schematic diagrams of the comparison curves between the actual thrust data and the three-stage analytical thrust data in the coiled launcher reconnecting gun under different initial velocity conditions with the type-I PFN excitation source; Figure 27 It is the second of the schematic diagrams of the comparison curves between the actual current data and the three-stage analytical current data in the coiled launcher reconnecting gun under different initial velocity conditions with the type-I PFN excitation source; Figure 28 It is the second of the schematic diagrams of the comparison curves between the actual thrust data and the three-stage analytical thrust data in the coiled launcher reconnecting gun under different initial velocity conditions with the type-I PFN excitation source; Figure 29 It is a schematic diagram of the pulse circuit topology of the type-II PFN excitation source provided by the embodiment of the present application; Figure 30 It is a schematic diagram of the equivalent circuit of the coiled launcher reconnecting gun during the capacitor discharge stage of the type-II PFN excitation source provided by the embodiment of the present application; Figure 31 It is a schematic diagram of the equivalent circuit of the coiled launcher reconnecting gun during the commutation stage of the diode branch of the type-II PFN excitation source provided by the embodiment of the present application; Figure 32 It is one of the schematic diagrams of the comparison curves between the actual current data and the two-stage analytical current data in the coiled launcher reconnecting gun under different initial velocity conditions with the type-II PFN excitation source; Figure 33 It is one of the schematic diagrams of the comparison curves between the actual thrust data and the two-stage analytical thrust data in the coiled launcher reconnecting gun under different initial velocity conditions with the type-II PFN excitation source; Figure 34 It is the second of the schematic diagrams of the comparison curves between the actual current data and the two-stage analytical current data in the coiled launcher reconnecting gun under different initial velocity conditions with the type-II PFN excitation source; Figure 35It is the second schematic diagram of the comparison curve between the real thrust data and the two-stage analytical thrust data in the coiling launcher in the type-II PFN excitation source provided by the embodiments of the present application and under different initial velocity conditions; Figure 36 It is the schematic diagram of the simulation result in the reaction force interval provided by the embodiments of the present application; Figure 37 It is the schematic diagram of the equivalent circuit of the coiling launcher coil gun provided by the embodiments of the present application; Figure 38 It is the schematic diagram of the comparison curve between the real external voltage and the derived voltage of the coiling launcher coil gun provided by the embodiments of the present application; Figure 39 It is the schematic diagram of the analytical result of the optimal electromagnetic coupling point position of the launcher in the coiling launcher reconnecting gun provided by the embodiments of the present application; Figure 40 It is the schematic diagram of the simulation result of the capacitor discharge time in the excitation source under different initial velocity conditions provided by the embodiments of the present application; Figure 41 It is the curve schematic diagram of the thrust data generated in the coiling launcher reconnecting gun under different capacitance value conditions provided by the embodiments of the present application. Detailed implementation manners

[0022] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application.

[0023] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish different objects, rather than to describe a specific order of the objects. For example, the first capacitor discharge stage and the second capacitor discharge stage are used to distinguish the capacitor discharge stages under different excitation sources, rather than to describe the specific order of the capacitor discharge stages.

[0024] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0025] In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple turns" refers to two turns or more. For example, a self-closed multi-layer metal coil disk refers to a metal coil with two turns or more.

[0026] The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

[0027] Figure 1 is a schematic structural diagram of a coiling type reconnection gun structure provided by an embodiment of the present application. As Figure 1 shown, it includes: an excitation source 1, a drive coil structure 2, and a projectile 3; The drive coil structure 2 is connected to the excitation source 1 and is used to generate an electromagnetic force under the excitation of the excitation source 1 to drive the projectile 3 to be launched; the projectile 3 is a self-closed multi-layer metal coil disk.

[0028] Specifically, in the embodiments of the present application, a coiling type reconnection gun structure is constructed by adopting an excitation source, a drive coil structure, and a projectile, and the projectile is a self-closed multi-layer metal coil disk. Here, the drive coil structure is connected to the excitation source, and the excitation source is used to provide a high-power pulse signal to excite electromagnetic coupling between the drive coil structure and the projectile, thereby generating an electromagnetic force to drive the projectile to be launched.

[0029] Among them, the self-closed multi-layer metal coil disk refers to a disk-shaped structure formed by a multi-layer of closely arranged coils wound spirally by a single metal wire, and the head and tail of the metal wire are connected to form a closed loop so that the coil can form a closed circuit.

[0030] Among them, the drive coil structure can adopt upper and lower arranged hollow coil disks, and each hollow coil disk is formed by a multi-layer of closely arranged hollow multi-turn coils.

[0031] Among them, the excitation source can adopt a Pulse Forming Network (PFN) circuit, including a type I PFN pulse circuit or a type II PFN pulse circuit. The PFN circuit is generally composed of multiple capacitors and inductors (or transmission lines). The capacitors are charged by a high-voltage power supply to store electrical energy in the electric field; the capacitors and inductors of the PFN are connected in a specific manner (such as a ladder network) to output the discharge current according to a predetermined time waveform (such as a rectangular wave), thereby forming the required pulse excitation signal.

[0032] Based on the content of the above embodiments, as an alternative embodiment, the drive coil structure is a copper coil structure, and the metal coil is an aluminum coil.

[0033] Specifically, since the characteristic of the reconnection type launch system is a strong magnetic field pulse and strong current excitation, and the order of magnitude of the current is in the kA to MA level. Ferromagnetic devices will be deeply saturated in this environment. Therefore, the projectile of the reconnection gun is usually made of non-ferromagnetic electromagnetic materials such as aluminum and copper. The projectile is a multi-turn winding structure to ensure that sufficient induced current can be generated when moving in the magnetic field, so as to obtain the electromagnetic force required for acceleration.

[0034] After analysis, the drive coil structure needs to withstand the impact of high-frequency and high-current, so materials with high electrical conductivity are required to reduce Joule heat loss. Copper has high electrical conductivity and is suitable as the material for the drive coil structure. At the same time, due to the high price of copper, if it is used for both the emitter and the hollow coil disc, the system cost will increase significantly.

[0035] Therefore, the emitter is suitable for using materials with low material density and high strength. Since the density of aluminum is relatively small, higher speeds can be achieved with a lighter mass. Aluminum or aluminum alloy materials can be preferably used for the emitter.

[0036] More specifically, as Figure 2 shown, in the embodiment of the present application, the drive coil structure specifically adopts a copper coil structure, and the emitter is a self-closed multi-layer metal coil disc, which can specifically adopt a self-closed coil structure wound by multiple turns of aluminum wire. In this way, the optimal balance of the performance, cost, and efficiency of the reconnection gun structure can be achieved.

[0037] Furthermore, as Figure 3 shown, in the embodiment of the present application, in order to simulate the current cross-section and simulate the eddy current situation inside the emitter, a small hole can be dug in the center of the emitter. When the hole is small enough, it can be considered that the hole has no influence on the internal induced eddy current.

[0038] To further illustrate the difference between the wound emitter reconnection gun provided by the present application and the traditional solid aluminum plate emitter reconnection gun, the following simulation result schematic diagrams are provided. As Figure 3 shown, it is a solid aluminum emitter reconnection gun; as Figure 4 shown, it is the eddy current density situation inside the emitter of the solid aluminum emitter reconnection gun. It can be seen that due to its eddy current skin effect, the internal eddy current distribution is uneven. As Figure 5 shown, it is the eddy current density situation inside the emitter of the wound emitter reconnection gun provided by the present application. It can be seen that since each turn of the coil is in a series structure, when the wire diameter is small enough, the eddy current skin effect can be ignored and the eddy current density distribution is uniform.

[0039] Furthermore, Figure 6 is a schematic diagram comparing the thrust curves of the wound emitter reconnection gun and the solid emitter reconnection gun provided by the embodiment of the present application. As Figure 6 shown, since the eddy current skin effect of the wound emitter reconnection gun (which can also be described as a wound mover reconnection gun) can be ignored, the current-carrying capacity can be greatly enhanced. Under the same external circuit excitation and the same size conditions, the peak thrust is increased by 23% compared to the solid emitter reconnection gun (which can also be described as a solid mover reconnection gun).

[0040] Figure 7It is a schematic diagram comparing the acceleration curves of a single-stage wound launcher reconnecting gun and a single-stage solid launcher reconnecting gun provided by an embodiment of the present application. As Figure 7 shown, since the thrust peak of the wound launcher reconnecting gun is higher, under the same external circuit excitation and the same size conditions, when the incident initial velocity is 100 m / s, the velocity increase effect can be increased by 15% compared with the solid launcher reconnecting gun.

[0041] For the wound launcher reconnecting gun structure of the embodiment of the present application, by deeply considering the connection between the launcher structure and the eddy current skin effect generated by it, the launcher is ingeniously designed into a self-closed multi-layer metal coil disk structure form. Since the radius of the metal coil in the wound coil launcher is always smaller than the eddy current skin depth generated by it, the eddy current skin effect of the launcher can be negligible, and the internal eddy current distribution and current density of the launcher will become uniform. Thus, the current-carrying capacity of the launcher can be greatly enhanced, and then the electromagnetic force thrust peak generated by the reconnecting gun structure and the exit velocity of the launcher can be improved, enhancing the overall performance of the reconnecting gun.

[0042] Based on the content of the above embodiment, as an optional embodiment, the drive coil structure includes two coaxially arranged upper and lower hollow coil disks connected in series or in parallel; the self-closed multi-layer metal coil disk is arranged parallel between the two hollow coil disks.

[0043] Specifically, in the embodiment of the present application, the drive coil structure includes two coaxially arranged upper and lower hollow coil disks connected in series or in parallel, and the self-closed multi-layer metal coil disk is arranged parallel between the two hollow coil disks. In this way, through the coaxial arrangement of the drive coil structure, it can be ensured that the repulsive forces received by the launcher cancel each other out, and the launcher is in force balance, so that the launcher can move more stably on the middle launch track of the drive coil structure, improving the launch performance of the reconnecting gun.

[0044] Among them, the structures of the two hollow coil disks can adopt hollow coil disk structures such as rectangular, square, circular, etc., and the present application does not make specific limitations on this.

[0045] Here, it should be noted that the series or parallel connection method refers to the connection method of the two hollow coil disks connected to the excitation source circuit. When the series connection of forward connection is selected, the same-name ends and different-name ends of the winding of the two hollow coil disks are connected in series and then connected to the excitation source circuit; when the parallel connection of forward connection is selected, the same-name ends of the winding of the two hollow coil disks are connected in parallel and then connected to the excitation source circuit.

[0046] Furthermore, the two coaxially arranged upper and lower hollow coil disks can adopt a series or parallel connection method according to actual design requirements, which can meet more application requirements of the reconnecting gun.

[0047] Based on the content of the above embodiments, as an alternative embodiment, the shapes, sizes, and number of turns of the two hollow coil discs are all kept the same.

[0048] Specifically, when the coils are in parallel, the excitations received by the two hollow coil discs are the same. If the shapes, sizes, and number of turns of the two hollow coil discs are different, it will cause the magnetic field intensities generated by the two hollow coil discs to be inconsistent, resulting in the repulsive force received by the emitter not being able to reach a balanced state, and it is difficult to achieve the emitter emitting in the middle of the hollow coil discs.

[0049] When the coils are in series, it is also possible to set the shapes, sizes, and number of turns of the two hollow coil discs to be the same to ensure that the emitter emits in the middle of the two hollow coil discs. Therefore, by designing the shapes, sizes, and number of turns of the two hollow coil discs to be the same, it can ensure that the emitter moves stably on the middle emission track of the two hollow coil discs, thereby improving the emission performance of the reconnection gun.

[0050] In the existing reconnection electromagnetic launch, the emitter structure usually uses a solid aluminum plate. The reconnection electromagnetic launch generates eddy currents in the aluminum plate through electromagnetic induction, and the eddy currents and the stator magnetic field generate electromagnetic forces to push the aluminum plate to accelerate. However, due to the uneven distribution of eddy currents, with the current electromagnetic field analysis method, it is difficult to analyze the current density at each point in the aluminum plate during the electromagnetic performance analysis of the reconnection gun structure, so the mathematical and physical essence of the reconnection electromagnetic launch cannot be obtained. Therefore, it is urgent to propose a new reconnection structure to improve the convenience and effectiveness of the electromagnetic performance analysis of the reconnection gun structure, so as to reveal the mathematical and physical essence of the reconnection launch, obtain the design principles of the reconnection electromagnetic system, and thus more scientifically guide the design of a high-performance reconnection electromagnetic launch system.

[0051] For this reason, the embodiments of the present application provide a method for analyzing the electromagnetic performance of a wound emitter reconnection gun structure to solve the above-mentioned defects of the prior art.

[0052] The method for analyzing the electromagnetic performance of the wound emitter reconnection gun structure provided by the present application is described below. The method for analyzing the electromagnetic performance of the wound emitter reconnection gun structure described below can be mutually corresponding and referred to the wound emitter reconnection gun structure described above.

[0053] Figure 8 is a schematic flow chart of the method for analyzing the electromagnetic performance of the wound emitter reconnection gun structure provided by the embodiments of the present application. It can be understood that it can be applied to any of the above-mentioned wound emitter reconnection gun structures, such as Figure 8 shown, the method includes: Step S1, determining the equivalent circuit equation of the reconnection gun structure at each discharge stage of the excitation source; Step S2: Analyze each equivalent circuit equation to obtain the current data model and thrust data model of the reconnecting gun structure in each discharge stage.

[0054] Specifically, in the embodiment of the present application, continue to refer to Figure 5 , which shows the eddy current density inside the wound-type launcher reconnecting gun provided in the present application. The eddy current skin effect inside it can be ignored, and the eddy current density is evenly distributed, which can greatly reduce the analysis difficulty of the electromagnetic system.

[0055] In the embodiment of the present application, in step S1, first, it is necessary to determine the equivalent circuit equation of the reconnecting gun structure in each discharge stage of the excitation source, and its specific implementation method is as follows.

[0056] Based on the content of the above embodiment, as an alternative embodiment, the driving coil structure is two coaxially arranged in series hollow coil disks. The self-inductance of the driving coil structure is determined based on the self-inductance of each hollow coil disk and the mutual inductance between the two hollow coil disks; the mutual inductance between the driving coil structure and the emitter is determined based on the mutual inductance between each hollow coil disk and the emitter.

[0057] Specifically, in the embodiment of the present application, as shown in Figure 9 , the driving coil structure is two coaxially arranged in series hollow coil disks, where and respectively represent the upper and lower hollow coil disks, is the wound aluminum coil of the emitter, and the black marks represent the same-name terminals. Furthermore, the equivalent circuit equation of the hollow coil disk can be determined, which can be expressed as: ; where is the external voltage of the hollow coil disk, is the current of the hollow coil disk, is the induced current of the emitter coil, is the ohmic resistance of the two hollow coil disks.

[0058] In this embodiment, the two hollow coil disks are connected in series in the same direction to enhance the magnetic field intensity. Among them, is the self-inductance of the driving coil structure, which can be expressed as: .

[0059] where , , are the self-inductance of the upper hollow coil disk, the self-inductance of the lower hollow coil disk, and the mutual inductance between the upper and lower hollow coil disks respectively.

[0060] is the mutual inductance of two hollow coil disks with respect to the emitter coil, .

[0061] Wherein, , are respectively the mutual inductance between the upper hollow coil disk and the emitter coil, and the mutual inductance between the lower hollow coil disk and the emitter coil.

[0062] Furthermore, in the embodiments of the present application, when the drive coil structure is two series-connected hollow coil disks arranged coaxially up and down, the equivalent circuit equation of the emitter structure can be expressed as: ; Wherein, is the self-inductance of the emitter coil, is the ohmic resistance of the emitter coil, is the derivative symbol.

[0063] As Figure 10 shown, since aluminum metal is a good conductor, the ohmic voltage drop can be ignored, and the above circuit equation can be rewritten as: .

[0064] Specifically, in the embodiments of the present application, when the capacitor in the excitation source starts to discharge, the initial values of the hollow coil disk current and the emitter current are both 0. Taking the integral of the above circuit equation simultaneously, we can obtain: ; As Figure 11 shown, it can be seen that due to the uniform internal eddy current distribution of the wound emitter reconnecting gun provided in the embodiments of the present application, within the engineering error, the following equality relationship is satisfied: .

[0065] However, compared with the solid emitter reconnecting gun structure, as Figure 12 shown, it can be seen that due to the non-uniform eddy current distribution inside the solid emitter reconnecting gun, it will lead to complex changes in the time-varying inductance, obvious eddy current skin effect, increased ohmic resistance, and the ohmic voltage drop cannot be ignored.

[0066] At the same time, as Figure 13 shown, it can be seen that due to the non-uniform eddy current distribution inside the solid emitter reconnecting gun, it leads to complex changes in the time-varying inductance, obvious eddy current skin effect, increased ohmic resistance, and does not satisfy the above equality relationship, that is: .

[0067] Further, specifically, in the embodiments of the present application, substituting the above equation relationship into the equivalent circuit equation of the air-core coil disk, the following can be obtained: ; Wherein, is the external voltage of the air-core coil disk, is the self-inductance of the air-core coil disk, is the ohmic resistance of the air-core coil disk.

[0068] Furthermore, it can be obtained that: ; In the embodiments of the present application, in order to ensure the conservation of input energy power, the emitter ohmic loss term of the equivalent circuit is included, and the equivalent circuit equation of the reconnection gun electromagnetic system after adjustment is: .

[0069] Thus, the equivalent circuit of the wound reconnection gun electromagnetic system in the series structure of two air-core coil disks can be effectively obtained, as shown in Figure 14 .

[0070] As shown in Figure 15 , combining the above loop equation, the left side of the equation is the real voltage, and the right side is the derived voltage. It can be seen that the derived voltage is consistent with the real voltage, which verifies the correctness of the above equivalent circuit.

[0071] Wherein, the term represents the demagnetization effect of the emitter eddy current on the air-gap magnetic field, and can be defined as the equivalent inductance; the term represents the energy consumption for generating thrust and can be defined as the active resistance; the term can be defined as the Joule loss resistance of the air-core coil disk and the emitter coil.

[0072] Based on the content of the above embodiments, as an alternative embodiment, the driving coil structure is two parallel air-core coil disks arranged coaxially up and down. The shapes, sizes, and number of turns of the two air-core coil disks are the same; the self-inductance of the driving coil structure is determined based on the self-inductance of any one air-core coil disk and the mutual inductance between the two air-core coil disks; the mutual inductance between the driving coil structure and the emitter is determined based on the mutual inductance between each air-core coil disk and the emitter.

[0073] Specifically, in the embodiments of the present application, as shown in Figure 16 , the driving coil structure is two parallel air-core coil disks arranged coaxially up and down. The two air-core coil disks are connected in parallel in the same direction to enhance the magnetic field intensity. Wherein, and respectively represent the upper and lower air-core coil disks, The wound aluminum coil serves as the emitter, and the black marks indicate the corresponding ends.

[0074] Similarly, the equivalent circuit equations of the two hollow coil discs 、 are respectively:

[0075] Among them, 、 、 are respectively the self-inductance of the upper stator coil, the self-inductance of the lower stator coil, and the mutual inductance between the upper and lower stator coils. 、 are respectively the mutual inductance between the upper hollow coil disc and the emitter coil, and the mutual inductance between the lower hollow coil disc and the emitter coil. is the voltage across the stator coil. 、 are respectively the currents in the branches of the two hollow coil discs. 、 are respectively the ohmic resistances of the two hollow coil discs.

[0076] Here, the equivalent circuit equation of the emitter coil can be expressed as: ; Among them, is the self-inductance of the emitter. Ignoring the ohmic resistance, the equivalent relationship of the emitter coil circuit is obtained, that is: ; When the sizes, shapes, and number of turns of the upper and lower hollow coil discs are exactly the same, and the emitter coil emits in the middle of the two hollow coil discs, there are: ; , ; Among them, the mutual inductance between the drive coil structure and the emitter is determined based on the mutual inductance between each hollow coil disc and the emitter, and it can be specifically defined as: = ; And there are: ; In this way, adding the circuit equations of the two hollow coil discs gives: ; Furthermore, by substituting the above equivalent relationships, the equivalent circuit equation of the parallel structure wound emitter electromagnetic gun system is obtained as:

[0077] Among them, the self-inductance of the drive coil structure is determined based on the self-inductance of any hollow coil disk and the mutual inductance between two hollow coil disks, and can be specifically defined as: .

[0078] Thus, the equivalent circuit of the reconnecting gun electromagnetic system in the parallel structure of two hollow coil disks can be effectively obtained, as Figure 17 shown.

[0079] As Figure 18 shown, similarly, by combining the above loop equations, it can be seen that the derived voltage is consistent with the true voltage, which verifies the correctness of the above equivalent circuit.

[0080] Furthermore, in the embodiments of the present application, in step S1, based on the above equivalent loop equations, combined with the discharge stage characteristics of different excitation sources, such as when the excitation source is a type I PFN excitation source or a type II PFN excitation source, the equivalent loop equations of the wound reconnecting gun structure under the series-parallel connection of the hollow coil disks can be respectively determined at each discharge stage of the excitation source.

[0081] Even further, in step S2, each equivalent loop equation can be used as a system differential equation, and these system differential equations can be analyzed with the current quantity and voltage quantity as the main variables, so as to analyze the current data model and thrust data model of the reconnecting gun structure at each discharge stage. According to these current data models and thrust data models, the reaction force essence of the reconnecting gun electromagnetic system can be revealed, which can provide an important basis for the circuit parameter selection and structural design of induction electromagnetic gun systems such as the wound launcher reconnecting gun and the wound launcher coil gun.

[0082] The electromagnetic performance analysis method of the wound launcher reconnecting gun structure in the embodiments of the present application, by deeply considering the connection between the launcher structure and the eddy current skin effect generated by it, cleverly designs the launcher into the structural form of a self-closed multi-layer metal coil disk. Since the radius of the metal coil in the wound coil launcher is always smaller than the eddy current skin depth generated by it, the eddy current skin effect of the launcher can be ignored, and the internal eddy current distribution and current density of the launcher will become uniform, which can achieve a higher thrust peak and can also greatly reduce the analysis difficulty of the reconnecting gun electromagnetic system; at the same time, by analyzing the equivalent loop equations of the reconnecting gun structure at each discharge stage of the excitation source, the current data model and thrust data model of the reconnecting gun structure are analyzed, which can reveal the mathematical and physical essence of the wound launcher reconnecting gun electromagnetic system and provide an important basis for the design principle and parameter selection of this electromagnetic system.

[0083] It should be noted that, for the convenience of describing the analytical process of the equivalent circuit equations of the reconnecting gun structure in each discharge stage of the excitation source, the following describes the analytical method under the condition that the upper and lower hollow coil discs in the drive coil structure are connected in series. This method is also applicable to the condition that the upper and lower hollow coil discs in the drive coil structure are connected in parallel. Therefore, the analytical derivation process under the condition of parallel connection of the upper and lower hollow coil discs can be obtained by referring to the same principle.

[0084] Based on the content of the above embodiments, as an optional embodiment, the excitation source is a first excitation source including a first capacitor discharge stage, a first diode branch commutation stage, and a diode branch freewheeling stage; each equivalent circuit equation includes a first equivalent circuit equation in the first capacitor discharge stage, a second equivalent circuit equation in the first diode branch commutation stage, and a third equivalent circuit equation in the diode branch freewheeling stage; Correspondingly, in step S2, each equivalent circuit equation is analyzed to obtain the current data model and the thrust data model of the reconnecting gun structure in each discharge stage, including: Using the mutual inductance between the drive coil structure and the emitter, the self-inductance of the drive coil structure, the self-inductance of the emitter, the initial charging voltage and capacitance value of the capacitor in the first excitation source, the first equivalent circuit equation is analyzed to obtain the current data model and the thrust data model of the reconnecting gun structure in the first capacitor discharge stage; Using the mutual inductance between the drive coil structure and the emitter, the self-inductance of the drive coil structure, the self-inductance of the emitter, as well as the freewheeling resistance, the initial charging voltage and capacitance value of the capacitor in the first excitation source, the second equivalent circuit equation and the third equivalent circuit equation are respectively analyzed to obtain the current data model and the thrust data model of the reconnecting gun structure in the first diode branch commutation stage and the diode branch freewheeling stage.

[0085] Specifically, in the embodiments of the present application, the first excitation source is a type-I PFN excitation source, and its circuit structure is as Figure 19 shown. The excitation source 1 is a type-I PFN excitation source, which consists of a capacitor C , a diode D , a resistor R and a thyristor TH and its discharge stage includes a capacitor discharge stage, a diode branch commutation stage, and a diode branch freewheeling stage.

[0086] In the embodiments of the present application, the first capacitor discharge stage is the capacitor discharge stage of the type-I PFN excitation source, and the first diode branch commutation stage is the diode branch commutation stage of the type-I PFN excitation source. More specifically, in the embodiments of the present application, when the reconnecting gun structure is in the first capacitor discharge stage, as Figure 20As shown in the figure, it is the equivalent circuit diagram of the discharge stage. By combining the equivalent circuit equations under the conditions of the upper and lower hollow coil disks connected in series, the first equivalent circuit equation can be obtained, namely: ; in, is the initial charging voltage of the capacitor, is the initial moment of the capacitor discharge phase.

[0087] It can be concluded that:

[0088] ; Furthermore, the mutual inductance between the driving coil structure and the emitter is utilized. , the self-inductance of the drive coil structure , the self-inductance of the emitter , the initial charging voltage of the capacitor in the first excitation source and capacitance value C By analyzing the above first equivalent loop equation, we can obtain the current data model and thrust data model of the reconnection gun structure in the first capacitor discharge stage.

[0089] Specifically, in this differential equation, there are two time-varying variables, the air-core coil current and and the mutual inductance between the air-core coil disk and the emitter coil A single differential equation cannot simultaneously resolve two variables. Because reconnection transmitter systems are characterized by currents ranging from kA to MA, ferromagnetic devices will experience deep saturation in these environments. Therefore, reconnection transmitters are made of aluminum and copper. The mutual inductance between the air-core coil disk and the transmitter coil is in the uH range.

[0090] Since the orders of magnitude of current and mutual inductance are very different, the speed at which they change over time is very different. The speed at which current changes over time is much faster than the speed at which inductance changes over time.

[0091] Therefore, the current can be defined as the "primary variable" and the inductance as the "secondary variable". Therefore, in this differential equation, the "secondary variable" is approximately regarded as a quantity that does not change with time, that is, this equation is analyzed as a differential equation with constant coefficients, and the solution can be obtained: ; in, and It is an intermediate algebraic variable and has no actual physical meaning.

[0092] Here, the mutual inductance in the above-derived analytical formula is not a fixed value, and the mutual inductance is a real-time quantity, that is, it changes with the operating position of the reconnecting gun. The form of this formula is too complex to be directly applied. After optimizing and retaining the order of magnitude of the formula parameters, since the engineering parameters are much smaller than 1, the parameters with higher order of magnitude are ignored and the parameters with lower order of magnitude are retained, and we can solve: ; As Figure 21 shown, there is a current depression in this analytical formula under high-speed conditions. The essential reason is that the mutual inductance-related terms are analyzed as constants, while the actual mutual inductance-related terms change with time.

[0093] In addition, the essence of analyzing the differential equation is to integrate the differential terms. Since the mutual inductance-related quantities are regarded as constants during the analysis process, that is, the mutual inductance-related terms are not integrated. To compensate for this depression, we can further directly perform an indefinite integral on the term in the above current formula, that is directly replace , and thus we can obtain: ; As Figure 22 shown, it is a schematic diagram of the current data obtained from the analytical formula after compensation changing with time. Further optimizing the order of magnitude of the current formula, we can solve the current data model , that is: ; After solving the current data model, from: ; where represents the mutual inductance gradient.

[0094] We can further solve the thrust data model , that is: .

[0095] That is, the current data model and the thrust data model of the reconnecting gun structure in the first capacitor discharge stage are: ; where is the mutual inductance between the emitter coil and the hollow coil disk at the end of the first capacitor discharge stage, s is the time of the first capacitor discharge stage, represents the moment of the first capacitor discharge stage.

[0096] Furthermore, specifically, when the reconnecting gun structure is in the commutation stage of the first diode branch, as Figure 23As shown, it is the equivalent circuit diagram of the commutation stage. By combining the equivalent circuit equations under the aforementioned conditions of series connection of hollow coil disks, the second equivalent circuit equation can be obtained, namely: ; in, is the capacitor branch current, is the diode branch current, is the current passing through the hollow coil disk, is the freewheeling resistor value, is the initial moment of the diode commutation phase.

[0097] Further analysis can be obtained: ; By using the mutual inductance between the driving coil structure and the emitter, the self-inductance of the driving coil structure, the self-inductance of the emitter, as well as the freewheeling resistance in the first excitation source, the initial charging voltage and capacitance value of the capacitor, the second equivalent circuit equation is analyzed to obtain the current data model and thrust data model of the reconnection gun structure in the commutation stage of the first diode branch.

[0098] Specifically, since the speed at which voltage changes with time is much greater than the speed at which inductance changes with time, the inductance is approximated as a time-invariant quantity in this differential equation. That is, this equation is analyzed as a differential equation with constant coefficients, and the analytical results are optimized by orders of magnitude. In the context of actual engineering, it is necessary to classify and discuss the discriminant of the second-order differential equation, namely: when The current data model and thrust data model of the reconnection gun structure in the first diode branch commutation stage can be analyzed, that is: ; in, represents the moment of the first diode commutation phase, Represents the time of the first diode commutation stage.

[0099] when When , the current data model and thrust data model of the reconnection gun structure in the commutation stage of the first diode branch can be analyzed, that is: ; Furthermore, in the embodiment of the present application, when the reconnection gun structure is in the diode branch freewheeling stage, as shown in FIG. Figure 24 As shown, it is the equivalent circuit diagram of the freewheeling stage. By combining the equivalent circuit equations, we can get the third equivalent circuit equation, that is: when When: ; Furthermore, by using the mutual inductance between the drive coil structure and the emitter, the self-inductance of the drive coil structure, the self-inductance of the emitter, as well as the freewheeling resistance, the initial charging voltage, and the capacitance value of the capacitor in the first excitation source, the above third equivalent circuit equation is analyzed. At this time, the current data model and the thrust data model of the reconnecting gun structure during the freewheeling stage of the diode branch can be obtained, that is: ; When , the third equivalent circuit equation is: ; Furthermore, in the embodiments of the present application, by using the mutual inductance between the drive coil structure and the emitter, the self-inductance of the drive coil structure, the self-inductance of the emitter, as well as the freewheeling resistance, the initial charging voltage, and the capacitance value of the capacitor in the first excitation source, the above third equivalent circuit equation is analyzed. At this time, the current data model and the thrust data model of the reconnecting gun structure during the freewheeling stage of the diode branch are obtained, that is: ; The above is the analysis process under the excitation conditions of the I-type PFN external circuit.

[0100] Here, a unified arrangement is made. Then, when :

[0101]

[0102] ; ; ; Among them, represents the position of the emitter when the capacitor discharge ends, is the current of the hollow coil disk, is the time of the capacitor discharge stage, is the time of the commutation stage of the diode branch.

[0103] Under the working condition parameters in Table 1, the comparison results shown in Figure 25 and Figure 26 can be numerically calculated. As shown in Figure 25 , Figure 25 in (a), (b), and (c) are the comparison results between the analytical data of the current data model and the corresponding actual current data when the incident velocity V0 of the emitter is 72 m / s, 300 m / s, and 680 m / s, respectively.

[0104] As shown in Figure 26 , Figure 26Among them, (a), (b), and (c) are respectively the comparison results between the analytical data of the thrust data model and the corresponding actual thrust data when the incident velocity V0 is 72 m / s, 300 m / s, and 680 m / s.

[0105] Table 1

[0106] Make appropriate adjustments with reference to the parameters in Table 1. When it is determined that :

[0107]

[0108] ; ; ; As Figure 27 shown, Figure 27 Among them, (a), (b), and (c) are respectively the comparison results between the analytical data of the current data model and the corresponding actual current data when the incident velocity V0 is 72 m / s, 300 m / s, and 680 m / s.

[0109] As Figure 28 shown, Figure 28 Among them, (a), (b), and (c) are respectively the comparison results between the analytical data of the thrust data model and the corresponding actual thrust data when the incident velocity V0 is 72 m / s, 300 m / s, and 680 m / s.

[0110] Here, according to Figures 25 to 28 it can be seen that for the type-I PFN excitation source and the analytical current data and analytical thrust data in the coaxial helical launch reconnection gun under different initial velocity conditions, the real current and thrust situations can be better restored, indicating that the current data model and thrust data model provided by this application are effective.

[0111] The method of the embodiment of this application can effectively analyze the analytical data model of the voltage, current, and thrust related parameters in different discharge stages under the type-I PFN excitation source by solving the differential equation of the electromagnetic system of the coaxial helical launch reconnection gun with the current quantity and voltage quantity as the main variables, which can greatly reduce the analytical difficulty of the electromagnetic system of the reconnection gun, and the analytical process is efficient and reliable.

[0112] Based on the content of the above embodiment, as an alternative embodiment, the excitation source is a second excitation source including a second capacitor discharge stage and a second diode branch commutation stage; each equivalent circuit equation includes a fourth equivalent circuit equation in the second capacitor discharge stage and a fifth equivalent circuit equation in the second diode branch commutation stage; Correspondingly, in step S2, each equivalent loop equation is analyzed to obtain the current data model and thrust data model of the reconnection gun structure in each discharge stage, including: The fourth equivalent circuit equation is analyzed using the mutual inductance between the drive coil structure and the emitter, the self-inductance of the drive coil structure, the self-inductance of the emitter, and the initial charging voltage and capacitance value of the capacitor in the second excitation source to obtain the current data model and thrust data model of the reconnection gun structure in the second capacitor discharge stage. The fifth equivalent circuit equation is analyzed by using the mutual inductance between the driving coil structure and the emitter, the self-inductance of the driving coil structure, the self-inductance of the emitter, as well as the freewheeling resistor in the second excitation source, the initial charging voltage and capacitance value of the capacitor, and the current data model and thrust data model of the reconnection gun structure in the commutation stage of the second diode branch are obtained.

[0113] Specifically, in the embodiment of the present application, the second excitation source is a type II PFN excitation source, and its circuit structure is as follows: Figure 29 As shown, the excitation source 1 is a type II PFN excitation source, which consists of a capacitor C ,diode D ,resistance R and thyristors TH The discharge stage only includes two stages: capacitor discharge stage and diode branch commutation stage.

[0114] In the embodiment of the present application, the second capacitor discharge stage is the capacitor discharge stage of the type II PFN excitation source, and the second diode branch commutation stage is the diode branch commutation stage of the type II PFN excitation source. More specifically, in the embodiment of the present application, when the reconnection gun structure is in the second capacitor discharge stage, as shown in FIG. Figure 30 As shown, it is the equivalent circuit diagram of the discharge stage. According to the above analytical process of the first capacitor discharge stage, similarly, by combining the above equivalent circuit equations, the fourth equivalent circuit equation can be obtained, that is: ; Furthermore, by analogy, the fourth equivalent circuit equation is analyzed using the mutual inductance between the driving coil structure and the emitter, the self-inductance of the driving coil structure, the self-inductance of the emitter, the initial charging voltage and capacitance value of the capacitor in the second excitation source, and the current data model and thrust data model of the reconnection gun structure in the second capacitor discharge stage can be obtained.

[0115] Specifically, the current data model and thrust data model of the reconnection gun structure in the second capacitor discharge stage can be obtained analytically as follows: ; Further, specifically, when the reconnection gun structure is in the second diode branch commutation stage, asFigure 31 As shown, it is the equivalent circuit diagram of the diode commutation stage. By combining the equivalent circuit equations, the fifth equivalent circuit equation can be obtained, namely: ; in, is the capacitor branch current, is the diode branch current, is the current passing through the hollow coil disk, is the freewheeling resistor value, is the initial moment of the diode commutation phase.

[0116] Similarly, in the embodiments of the present application, the fifth equivalent circuit equation can be analyzed by utilizing the mutual inductance between the driving coil structure and the emitter, the self-inductance of the driving coil structure, the self-inductance of the emitter, and the freewheeling resistance in the second excitation source, the initial charging voltage of the capacitor, and the capacitance value to obtain the current data model and thrust data model of the reconnection gun structure in the second diode branch commutation stage.

[0117] Specifically, when When , the current data model and thrust data model of the reconnection gun structure in the second diode branch commutation stage can be analyzed, that is: ; when When , the current data model and thrust data model of the reconnection gun structure in the second diode branch commutation stage can be analyzed, that is: ; Here, the analytical model under the excitation condition of type II PFN excitation source is unified and organized: when When , it can be analyzed as: ; ; ; ; is the time of the second capacitor discharge stage, such as Figure 32 As shown, Figure 32 (a), (b), and (c) are the comparison results of the analytical data of the current data model and the corresponding actual current data when the incident velocity V0 is 72m / s, 300m / s, and 680m / s, respectively.

[0118] like Figure 33 As shown, Figure 33Among them, (a), (b), and (c) are respectively the comparison results between the analytical data of the thrust data model and the corresponding actual thrust data when the incident velocity V0 is 72 m / s, 300 m / s, and 680 m / s.

[0119] Furthermore, when it can be analyzed that:

[0120] ; ; ; As Figure 34 shown, Figure 34 among them, (a), (b), and (c) are respectively the comparison results between the analytical data of the current data model and the corresponding actual current data when the incident velocity V0 is 72 m / s, 300 m / s, and 680 m / s.

[0121] As Figure 35 shown, Figure 35 among them, (a), (b), and (c) are respectively the comparison results between the analytical data of the thrust data model and the corresponding actual thrust data when the incident velocity V0 is 72 m / s, 300 m / s, and 680 m / s.

[0122] Here, according to Figures 32 to 35 it can be seen that for the type-II PFN excitation source and the analytical current data and analytical thrust data in the reconnection gun of the wound launcher under different initial velocity conditions, the real current and thrust situations can be better restored, which indicates that the current data model and thrust data model provided by this application are effective.

[0123] The method of the embodiment of this application, by solving the differential equation of the electromagnetic system of the wound launcher reconnection gun with the current quantity and voltage quantity as the main variables, can effectively analyze the analytical data model of the voltage, current, and thrust related parameters in different discharge stages under the type-II PFN excitation source, and further reduces the analytical difficulty of the reconnection gun electromagnetic system.

[0124] In the embodiment of this application, after obtaining the current data model and thrust data model of the reconnection gun structure in each discharge stage, the reaction force essence of the electromagnetic system of the wound launcher reconnection gun can be revealed according to these data models.

[0125] According to the virtual work displacement theorem, the thrust formula is: ; As Figure 36 shown, it can be defined The interval is the reaction force interval. Whether the recoilless gun generates a reaction force depends on whether there is still current in the circuit when the projectile is in the reaction force interval.

[0126] It should be noted that the electromagnetic design analysis method of this application is also applicable to the wound projectile coil gun. By replacing the solid projectile with a wound projectile, the eddy current density distribution inside the projectile is made uniform, greatly reducing the analysis difficulty.

[0127] Similarly, according to the equivalent circuit derivation method of the wound recoilless electromagnetic system, we can get: ; Similarly, as Figure 37 shown, it is the equivalent circuit of the wound projectile coil gun.

[0128] As Figure 38 shown, it can be seen that the derived voltage is approximately equal to the actual voltage, which verifies the correctness of the above equivalent circuit model of the wound projectile coil gun.

[0129] Similarly, it can be obtained that the analysis process and parameter selection under the excitation of type I PFN and type II PFN are the same as those of the aforementioned wound recoilless gun.

[0130] Based on the content of the above embodiments, as an optional embodiment, in step S2, after analyzing each equivalent circuit equation to obtain the current data model and thrust data model of the recoilless gun structure at each discharge stage, the method further includes: Performing thrust peak analysis based on the thrust data model of the recoilless gun structure at each discharge stage to determine the electromagnetic coupling information corresponding to the highest thrust peak; [[ID=Z7]] Performing capacitor selection analysis on the capacitors in the excitation source according to the electromagnetic coupling information to determine the optimal capacitance value configuration model of the capacitors.

[0131] Specifically, in the embodiments of this application, an optimal thrust peak capacitor selection method is also provided, and its specific implementation steps include: Step S101: Performing thrust peak analysis based on the thrust data model of the recoilless gun structure at each discharge stage to determine the electromagnetic coupling information corresponding to the highest thrust peak. The specific electromagnetic coupling information can be defined as the electromagnetic system The maximum position is the electromagnetic optimal coupling point .

[0132] Step S102: Performing capacitor selection analysis on the capacitors in the excitation source according to the electromagnetic coupling information to determine the optimal capacitance value configuration model of the capacitors.

[0133] More specifically, in step S101, by performing a thrust peak analysis using the previously obtained parsed thrust data model, it can be concluded that: whether under the excitation conditions of type I PFN or type II PFN, during the capacitor discharge stage, the thrust is in a monotonically increasing stage. When current passes through the diode branch, the freewheeling resistance will consume the energy of the resistor, and the thrust will tend to decrease. Therefore, in order to obtain the optimal speed increase effect, it is necessary to increase the area enclosed by the thrust and the time axis. The area of the thrust graph mainly depends on two dimensions, namely the height dimension and the width dimension. The height dimension is the thrust peak, and the width dimension is the duration of the thrust. The most optimal selection of the capacitor should make the thrust peak reach the highest, thereby obtaining the optimal speed increase. From the previously obtained thrust formula during the capacitor discharge stage: ; When in the capacitor discharge stage, monotonically increases to 1. When the capacitor discharge ends , if the emitter is at the maximum position of the electromagnetic system at this time, the highest thrust peak can be obtained, achieving the optimum in the height dimension.

[0134] ; ; Since the mutual inductance related term is much smaller than 1, the value is very small. , The maximum position is at , that is the maximum position. For the convenience of future definition and processing, the maximum position is defined as the optimal electromagnetic coupling point .

[0135] As Figure 39 shown, Figure 39 in (a) and (b) of are the schematic diagrams of the magnitudes of the terms at different positions. It can be seen from the figure that both of them basically reach the maximum value at the same position.

[0136] Furthermore, in the embodiments of the present application, in step S102, the capacitor in the excitation source is selected and analyzed according to the electromagnetic coupling information. After analysis, when the incident speed of the emitter is too fast and the discharge speed is slow, the current does not rise to the peak value, and the emitter has flown out of the electromagnetic coupling range, resulting in no high thrust and poor speed increase effect; while when the incident speed of the emitter is too slow and the discharge speed is fast, the emitter is at the optimal electromagnetic coupling point , and the energy in the loop has been consumed, resulting in a low thrust peak and a short thrust duration, and a poor speed increase effect.

[0137] Therefore, there is an optimal match between the incident velocity of the emitter and the discharge velocity of the capacitor, such that when the capacitor discharge ends, the emitter is exactly at the optimal electromagnetic coupling point. , at this time, the emitter obtains the highest peak thrust. Given the incident velocity under the conditions of the reconnecting gun, the discharge velocity is adjusted by capacitor selection, so as to achieve the optimal matching relationship.

[0138] More specifically, the incident velocity of the emitter and the discharge time of the capacitor should satisfy:

[0139]

[0140] where, is the position of the emitter when the capacitor discharge stage ends, is the discharge time of the capacitor stage.

[0141] Since the change in velocity of each stage of the reconnecting gun is relatively small compared to the initial velocity, the change in velocity can be ignored, and the displacement is estimated using the initial velocity. Further, according to the current data model of the capacitor discharge stage: ; When the capacitor discharge ends, , we get: ; Since the capacitor discharge time is a fixed value before launch and is not a variable that changes with the position of the emitter, the capacitor discharge time formula has the highest calculation accuracy when the capacitor discharge ends. Set a breakpoint when the capacitor discharge ends in the simulation model. The vertical coordinate represents the calculated capacitor discharge time, and the horizontal coordinate represents the simulation time. When the simulation ends, the equality of the vertical and horizontal coordinates indicates that this formula has high accuracy.

[0142] As Figure 40 shown, Figure 40 in (a), (b), and (c) respectively represent that when the incident velocity V0 of the emitter is 72 m / s, 300 m / s, and 680 m / s, the horizontal and vertical coordinates are basically equal at the end of the first capacitor discharge stage. It can be seen from this that the capacitor discharge time formula analyzed in this application has high accuracy.

[0143] When the capacitor discharge ends, the emitter is at the optimal electromagnetic coupling point , that is, . The optimal electromagnetic coupling point is determined by the structure of the reconnecting system itself. When the structure is determined, the position of the optimal coupling point is already given, and the optimal capacitor selection formula can be obtained, that is, the best capacitance value configuration model of the capacitor is obtained. Among them, the best capacitance value configuration model of the capacitor can be expressed as:

[0144]

[0145] For example, the optimal capacitor selection when the initial velocity is 300m / s is 0.64mF. In order to control the initial energy of the capacitor to remain unchanged: Figure 41 As shown, Figure 41 (a), (b), and (c) are schematic diagrams of thrust curves when the capacitance value is 0.32mF and the initial voltage is 27946V, the capacitance value is 0.64mF and the initial voltage is 19764V, and the capacitance value is 1.28mF and the initial voltage is 13977V, respectively. It can be seen from the figure that the thrust peak is the highest when the capacitance value is 0.64mF, and the thrust peak decreases when the capacitance values are 0.32mF and 1.28mF.

[0146] In addition, in an embodiment of the present application, a method for estimating capacitor discharge time and discharge displacement with different initial velocities is also provided, and the specific implementation method is described as follows. The velocity change of a single-stage reconnection gun in each stage is relatively small compared to the initial velocity, so the error in estimating the displacement using the initial velocity is small. Combining the above equations, we can get: ; in, Represents the functional relationship between mutual inductance and emitter position, which can be solved by combining and discharge displacement , according to the capacitor discharge time formula: ; The capacitor discharge time can be estimated.

[0147] The method of the embodiment of the present application uses the thrust data model of the reconnection gun structure at each discharge stage to perform thrust peak analysis, and can parse out information such as the optimal capacitor selection formula, discharge displacement, and discharge time estimation. This can provide important guidance and basis for the selection of circuit parameters and structural design of the reconnection gun, and the corresponding analytical method and design principles are also applicable to induction-type electromagnetic guns such as wound-type launcher coil guns.

[0148] The method steps in the embodiments of this application can be implemented in a hardware manner or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in a random access memory (RAM), flash memory, read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), register, hard disk, removable hard disk, CD-ROM, or any other form of storage medium well-known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC.

[0149] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of this application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired manner (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or a wireless manner (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that the computer can access or a data storage device such as a server, data center, etc. that includes one or more integrated available media. The available media can be magnetic media (such as floppy disks, hard disks, magnetic tapes), optical media (such as DVDs), or semiconductor media (such as solid state disks (SSDs)), etc.

[0150] It can be understood that the various numerical numbers involved in the embodiments of this application are only for the convenience of description and are not used to limit the scope of the embodiments of this application.

[0151] It should be understood that expressions such as "including" and "may include" that can be used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "including" and / or "having" can be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or a combination thereof, but cannot be interpreted as excluding the existence or possibility of addition of one or more other characteristics, numbers, operations, constituent elements, components, or a combination thereof.

[0152] In the description of the embodiments of this application, it should be noted that unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected and the relative positional relationship after connection remains unchanged. "Rotational connection" means that the two are connected and can rotate relative to each other after connection. "Sliding connection" means that the two are connected and can slide relative to each other after connection. The orientation terms mentioned in the embodiments of this application, such as "upper", "lower", "inner", "outer", etc., are only with reference to the direction of the accompanying drawings. Therefore, the orientation terms used are for better and clearer description and understanding of the embodiments of this application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0153] In addition, in the embodiments of this application, mathematical concepts such as coaxial, symmetric, equal, parallel, and perpendicular are mentioned. These limitations are all in view of the current technological level, rather than absolute strict definitions in the mathematical sense, and a small amount of deviation is allowed. Being approximately coaxial, approximately symmetric, approximately equal, approximately parallel, approximately perpendicular, etc. are all acceptable.

[0154] As mentioned above, the above are only the specific embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A reconnection gun structure for a wound launcher, characterized in that Comprising: An excitation source, a drive coil structure, and an emitter; The drive coil structure is connected to the excitation source and is configured to generate an electromagnetic force under the excitation of the excitation source to drive the emitter to emit; the emitter is a self-closed multi-layer metal coil disk.

2. The reconnection gun structure of the coiled launcher according to claim 1, characterized in that, The drive coil structure includes two coaxially arranged hollow coil disks that are connected in series or parallel; the multi-layer metal coil disk is arranged parallelly between the two hollow coil disks.

3. The reconnection gun structure of the winding type launcher according to claim 2, characterized in that, The shapes, sizes, and number of turns of the two hollow coil disks are all the same.

4. The coiling type projectile reconnection gun structure according to any one of claims 1-3, characterized in that, The drive coil structure is a copper coil structure, and the metal coil disk is an aluminum coil disk.

5. An electromagnetic performance analysis method applied to the reconnection gun structure of the winding type launcher according to any one of claims 1-4, characterized in that, Comprising: Determining the equivalent circuit equations of the reconnecting gun structure at each discharge stage of the excitation source; Analyzing each of the equivalent circuit equations to obtain the current data model and the thrust data model of the reconnecting gun structure at each discharge stage.

6. The electromagnetic performance analysis method according to claim 5, characterized in that The excitation source is a first excitation source including a first capacitor discharge stage, a first diode branch commutation stage, and a diode branch freewheeling stage; each of the equivalent circuit equations includes a first equivalent circuit equation for the first capacitor discharge stage, a second equivalent circuit equation for the first diode branch commutation stage, and a third equivalent circuit equation for the diode branch freewheeling stage; Correspondingly, the analyzing each of the equivalent circuit equations to obtain the current data model and the thrust data model of the reconnecting gun structure at each discharge stage includes: Analyzing the first equivalent circuit equation by using the mutual inductance between the drive coil structure and the emitter, the self-inductance of the drive coil structure, the self-inductance of the emitter, the initial charging voltage and capacitance value of the capacitor in the first excitation source to obtain the current data model and the thrust data model of the reconnecting gun structure in the first capacitor discharge stage; Analyzing the second equivalent circuit equation and the third equivalent circuit equation respectively by using the mutual inductance between the drive coil structure and the emitter, the self-inductance of the drive coil structure, the self-inductance of the emitter, and the freewheeling resistance, the initial charging voltage and capacitance value of the capacitor in the first excitation source to obtain the current data model and the thrust data model of the reconnecting gun structure in the first diode branch commutation stage and the diode branch freewheeling stage.

7. The electromagnetic performance analysis method according to claim 5, characterized in that The excitation source is a second excitation source including a second capacitor discharge stage and a second diode branch commutation stage; each of the equivalent circuit equations includes a fourth equivalent circuit equation for the second capacitor discharge stage and a fifth equivalent circuit equation for the second diode branch commutation stage; Correspondingly, the analyzing each of the equivalent circuit equations to obtain the current data model and the thrust data model of the reconnecting gun structure at each discharge stage includes: Analyzing the fourth equivalent circuit equation by using the mutual inductance between the drive coil structure and the emitter, the self-inductance of the drive coil structure, the self-inductance of the emitter, the initial charging voltage and capacitance value of the capacitor in the second excitation source to obtain the current data model and the thrust data model of the reconnecting gun structure in the second capacitor discharge stage; Analyze the fifth equivalent circuit equation by using the mutual inductance between the driving coil structure and the emitter, the self-inductance of the driving coil structure, the self-inductance of the emitter, as well as the freewheeling resistance in the second excitation source, the initial charging voltage of the capacitor, and the capacitance value, to obtain the current data model and the thrust data model of the reconnection gun structure during the commutation stage of the second diode branch.

8. The electromagnetic property analysis method according to any one of claims 6 or 7, characterized in that The driving coil structure is two coaxially arranged in series hollow coil discs, and the self-inductance of the driving coil structure is determined based on the self-inductance of each hollow coil disc and the mutual inductance between the two hollow coil discs; the mutual inductance between the driving coil structure and the emitter is determined based on the mutual inductance between each hollow coil disc and the emitter.

9. The electromagnetic property analysis method according to any one of claims 6 or 7, characterized in that The driving coil structure is two coaxially arranged in parallel hollow coil discs, and the shapes, sizes, and number of turns of the two hollow coil discs are all the same; the self-inductance of the driving coil structure is determined based on the self-inductance of any one of the hollow coil discs and the mutual inductance between the two hollow coil discs; the mutual inductance between the driving coil structure and the emitter is determined based on the mutual inductance between each hollow coil disc and the emitter.

10. The electromagnetic property analysis method according to claim 5, characterized in that, After analyzing each of the equivalent circuit equations to obtain the current data model and the thrust data model of the reconnection gun structure during each discharge stage, the method further includes: Conduct a thrust peak analysis based on the thrust data model of the reconnection gun structure during each discharge stage to determine the electromagnetic coupling information corresponding to the highest thrust peak; Conduct a type selection analysis of the capacitor in the excitation source based on the electromagnetic coupling information to determine the optimal capacitance value configuration model of the capacitor.

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