Delivery design method, device and equipment for cartridge loading system and readable medium

Abstract

The invention relates to a cartridge loading system putting design method and device, electronic equipment and a computer readable medium. The method comprises the following steps: establishing a parachute object geometric model in a barrel-loaded missile system, wherein the barrel-loaded missile system comprises a flexible parachute, parachute cords, a cabin body and a missile body; carrying out initial setting on the cartridge loading system; carrying out fluid-solid coupling simulation on the cartridge loading system according to the initial setting; in the fluid-structure interaction simulation process, after the barrel-loaded missile system reaches a stable state, triggering the missile body to pop up; recording a separation track of the cabin body and the projectile body; and when the separation track meets the safety requirement, the design of the cartridge loading system is determined. According to the method, the problem that the dynamic characteristics of the cartridge loading system with flexible parachute deceleration in the release separation stage are difficult to predict can be solved, fluid-solid coupling and rigid-flexible coupling simulation methods are established, and the prediction precision of the separation dynamics of the cartridge loading system under the complex dynamic condition is improved.

Description

Technical Field

[0001] The present application relates to the field of computer information processing, and more particularly, to a method, device, electronic device, and computer-readable medium for designing the delivery of a cartridge ammunition system. Background Art

[0002] The delivery process is crucial for the success or failure of the combat mission of cartridge ammunition. Gun-launched delivery and air delivery can meet the requirements of large-scale, long-distance, and rapid delivery of cartridge ammunition, but there is a contradiction between rapid delivery and the low speed and stability of the launch deployment, and a deceleration system mainly composed of a flexible parachute is required for connection. After the flexible parachute is arranged, the parachute, the projectile body, and the cabin body form a cartridge ammunition system, which is a parachute-object system with complex rigid-flexible coupling.

[0003] During the deceleration process of the cartridge ammunition system, unstable dynamic phenomena such as pendulum and conical pendulum may occur. Due to the introduction of the flexible parachute, the separation dynamics of the cartridge ammunition are very complex under dynamic conditions. There are complex aerodynamic interferences between the projectile body and the cabin body, and between the rigid body and the flexible parachute. The separation process needs to meet the safety, compatibility, and control requirements of the projectile body for rapid deployment. Therefore, before the delivery of the cartridge ammunition, it is necessary to accurately simulate the multi-body separation dynamics of the cartridge ammunition under dynamic conditions.

[0004] Existing simulation methods can relatively accurately simulate the inflation deployment and steady descent process of the flexible parachute, but do not consider the dynamic characteristics of the load suspended under the flexible parachute. For the problem of the separation dynamics of the cartridge ammunition under dynamic conditions with a flexible parachute deceleration system, there is currently no reliable simulation method.

[0005] Therefore, a new method, device, electronic device, and computer-readable medium for designing the delivery of a cartridge ammunition system are needed.

[0006] The above information disclosed in the background art section is only used to enhance the understanding of the background of the present application, and thus it may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] In view of this, the present application provides a method, device, electronic device, and computer-readable medium for designing the delivery of a cartridge ammunition system, which can solve the problem that it is difficult to predict the dynamic characteristics of the cartridge ammunition system with a flexible parachute deceleration during the delivery and separation stage, establish a fluid-structure interaction and rigid-flexible coupling simulation method, and improve the prediction accuracy of the separation dynamics of the cartridge ammunition system under complex dynamic conditions.

[0008] Other features and advantages of the present application will become apparent through the following detailed description, or will be partially learned through the practice of the present application.

[0009] According to one aspect of the present application, a design method for the delivery of a cartridge ammunition system is proposed. The method includes: establishing a geometric model of the parachute in the cartridge ammunition system, where the cartridge ammunition system includes: a flexible parachute, parachute ropes, a cabin, and a projectile; performing an initial setting on the cartridge ammunition system; performing a fluid-structure interaction simulation on the cartridge ammunition system according to the initial setting; during the fluid-structure interaction simulation, after the cartridge ammunition system reaches a stable state, triggering the ejection of the projectile; recording the separation trajectory of the cabin and the projectile; when the separation trajectory meets the safety requirements, determining the design of the cartridge ammunition system.

[0010] In an exemplary embodiment of the present application, establishing the geometric model of the cartridge ammunition system includes: establishing the geometric model of the cartridge ammunition system based on the finite element method; performing model settings on the geometric model of the cartridge ammunition system; establishing a fluid mesh around the geometric model of the cartridge ammunition system.

[0011] In an exemplary embodiment of the present application, performing model settings on the geometric model of the cartridge ammunition system includes: connecting the projectile and the cabin through a spring model; setting a rigid constraint plate at the outlet of the cabin; setting the rigid constraint plate and the projectile to be in face-to-face contact.

[0012] In an exemplary embodiment of the present application, establishing a fluid mesh around the geometric model of the cartridge ammunition system further includes: the finite element meshes corresponding to the flexible parachute, the parachute ropes, the cabin, and the projectile and the fluid mesh interpenetrate each other.

[0013] In an exemplary embodiment of the present application, performing an initial setting on the cartridge ammunition system includes: setting the densities of the flexible parachute, the parachute ropes, the cabin, and the projectile; setting the mechanical parameters of the flexible parachute, the parachute ropes, the cabin, and the projectile; setting the initial velocities of the flexible parachute, the parachute ropes, the cabin, and the projectile; setting the gravitational fields of the flexible parachute, the parachute ropes, the cabin, and the projectile.

[0014] In an exemplary embodiment of the present application, performing a fluid-structure interaction simulation on the cartridge ammunition system according to the initial setting includes: performing a simulation on the cartridge ammunition system in the fluid domain according to the initial setting; performing a simulation on the cartridge ammunition system in the structural domain according to the initial setting; calculating the interaction between the fluid domain and the structural domain through a penalty function.

[0015] In an exemplary embodiment of the present application, simulating the cartridge ammunition system in the fluid domain according to the initial settings includes: setting the fluid domain boundary as a non-reflective boundary; generating the Navier-Stokes equations described by ALE in the fluid domain according to the initial settings; performing simulation calculations on the cartridge ammunition system according to the Navier-Stokes equations; and making the fluid domain grid follow the spatial movement of the cartridge ammunition system based on the grid adaptation technology.

[0016] In an exemplary embodiment of the present application, simulating the cartridge ammunition system in the structural domain according to the initial settings includes: generating the solid mechanics equations of the cartridge ammunition system in the structural domain according to the initial settings; and performing simulation calculations on the cartridge ammunition system based on the solid mechanics equations.

[0017] In an exemplary embodiment of the present application, calculating the interaction between the fluid domain and the structural domain through a penalty function includes: tracking the relative distance between the fluid domain nodes and the structural domain nodes through the penalty function method; and applying a coupling force to the interface of the penetrating substance based on the relative distance.

[0018] In an exemplary embodiment of the present application, after the cartridge ammunition system reaches a stable state, triggering the ejection of the projectile includes: after the speed, and / or attitude, and / or flexible parachute form of the cartridge ammunition system is stable, making the contact between the projectile and the restraint plate fail to trigger the ejection of the projectile.

[0019] In an exemplary embodiment of the present application, when the separation trajectory meets the safety requirements, determining the design of the cartridge ammunition system includes: calculating the safety parameters of the delivery process of the cartridge ammunition system according to the separation trajectory, where the safety parameters include: safety distance, projectile attitude; and determining the design of the cartridge ammunition system when the safety parameters meet the safety requirements.

[0020] According to one aspect of the present application, a device for designing the delivery of a cartridge ammunition system is proposed. The device includes: a model module for establishing a geometric model of the parachute in the cartridge ammunition system, where the cartridge ammunition system includes: a flexible parachute, parachute ropes, a cabin, and a projectile; a setting module for performing initial settings on the cartridge ammunition system; a simulation module for performing fluid-structure interaction simulation on the cartridge ammunition system according to the initial settings; an ejection module for triggering the ejection of the projectile after the cartridge ammunition system reaches a stable state during the fluid-structure interaction simulation; a trajectory module for recording the separation trajectory of the cabin and the projectile; and a design module for determining the design of the cartridge ammunition system when the separation trajectory meets the safety requirements.

[0021] According to one aspect of the present application, an electronic device is provided, which includes: one or more processors; a storage device for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the method as described above.

[0022] According to one aspect of the present application, a computer-readable medium is provided, on which a computer program is stored, and when the program is executed by a processor, the method as described above is implemented.

[0023] According to the design method, device, electronic device and computer-readable medium for the dispensing of a cartridge ammunition system of the present application, by establishing a geometric model of the parachute in the cartridge ammunition system, the cartridge ammunition system includes: a flexible parachute, suspension lines, a cabin, and a projectile; performing an initial setting on the cartridge ammunition system; performing a fluid-structure interaction simulation on the cartridge ammunition system according to the initial setting; during the fluid-structure interaction simulation, after the cartridge ammunition system reaches a stable state, triggering the ejection of the projectile; recording the separation trajectory of the cabin and the projectile; when the separation trajectory meets the safety requirements, determining the design method of the cartridge ammunition system, which can solve the problem that it is difficult to predict the dynamic characteristics of a cartridge ammunition system with a flexible parachute during the dispensing and separation stage, establish a fluid-structure interaction and rigid-flexible coupling simulation method, and improve the prediction accuracy of the separation dynamics of the cartridge ammunition system under complex dynamic conditions.

[0024] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. Brief Description of the Drawings

[0025] By referring to the accompanying drawings and describing its exemplary embodiments in detail, the above and other objects, features and advantages of the present application will become more apparent. The following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 is a flowchart of a design method for the dispensing of a cartridge ammunition system according to an exemplary embodiment.

[0027] Figure 2 is a flowchart of a design method for the dispensing of a cartridge ammunition system according to another exemplary embodiment.

[0028] Figures 3 to 8 is a schematic diagram of a design method for the dispensing of a cartridge ammunition system according to an exemplary embodiment.

[0029] Figures 9 to 14 is a schematic diagram of a design method for the dispensing of a cartridge ammunition system according to an exemplary embodiment.

[0030] Figure 15 It is a block diagram of a dispensing design device for a cartridge ammunition system shown according to an exemplary embodiment.

[0031] Figure 16 It is a block diagram of an electronic device shown according to an exemplary embodiment.

[0032] Figure 17 It is a block diagram of a computer-readable medium shown according to an exemplary embodiment. Detailed implementation manners

[0033] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar parts, and thus their repetitive description will be omitted.

[0034] In addition, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of this application. However, those skilled in the art will realize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of this application.

[0035] The block diagrams shown in the drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0036] The flowcharts shown in the drawings are merely illustrative and not necessarily include all the content and operations / steps, nor are they necessarily executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to the actual situation.

[0037] It should be understood that although terms such as first, second, and third may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Thus, the first component discussed below can be referred to as the second component without departing from the teachings of the concept of this application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0038] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of exemplary embodiments, and the modules or processes in the accompanying drawings are not necessarily essential for implementing the present application, so they cannot be used to limit the protection scope of the present application.

[0039] Figure 1 It is a flowchart of a method for designing the delivery of a cartridge ammunition system shown according to an exemplary embodiment. The method 10 for designing the delivery of a cartridge ammunition system at least includes steps S102 to S112.

[0040] As Figure 1 shown, in S102, a geometric model of the parachute object in the cartridge ammunition system is established. The cartridge ammunition system includes: a flexible parachute, suspension lines, a cabin body, and a projectile body.

[0041] In one embodiment, the geometric model of the cartridge ammunition system can be established based on the finite element method;

[0042] Model settings are performed on the geometric model of the cartridge ammunition system; a fluid mesh is established around the geometric model of the cartridge ammunition system.

[0043] More specifically, the projectile body and the cabin body are connected by a spring model; a rigid constraint plate is arranged at the outlet of the cabin body; the rigid constraint plate and the projectile body are arranged to be in face-to-face contact. More specifically, the finite element meshes corresponding to the flexible parachute, the suspension lines, the cabin body, the projectile body and the fluid mesh are also set to interpenetrate each other.

[0044] In a specific practical application, a finite element model of the parachute object system can be constructed with the geometric models of the flexible parachute, the suspension lines, the cabin body and the projectile body as samples. The projectile body and the cabin body are connected by a spring model, and the spring is in a compressed state before separation; a rigid constraint plate is used to constrain the movement of the projectile body at the outlet of the cabin body, and the constraint plate and the projectile body are in face-to-face contact; a fluid mesh is established around the parachute object system, and the fluid mesh interpenetrates with the meshes of the other parts.

[0045] In S104, initial settings are performed on the cartridge ammunition system. The densities of the flexible parachute, the suspension lines, the cabin body, and the projectile body can be set; the mechanical parameters of the flexible parachute, the suspension lines, the cabin body, and the projectile body can also be set; the initial velocities of the flexible parachute, the suspension lines, the cabin body, and the projectile body can also be set; the gravitational fields of the flexible parachute, the suspension lines, the cabin body, and the projectile body can also be set.

[0046] In S106, a fluid-structure interaction simulation is performed on the cartridge ammunition system according to the initial settings. The cartridge ammunition system can be simulated in the fluid domain according to the initial settings; the cartridge ammunition system can be simulated in the structural domain according to the initial settings; the interaction between the fluid domain and the structural domain is calculated through a penalty function.

[0047] Among them, the specific content of "performing fluid-structure interaction simulation on the cartridge ammunition system according to the initial settings" will be described in detail in Figure 2 the corresponding embodiments.

[0048] In S108, during the fluid-structure interaction simulation, after the cartridge ammunition system reaches a stable state, the projectile is triggered to pop out. After the speed, and / or attitude, and / or flexible parachute form of the cartridge ammunition system are stable, the contact between the projectile and the restraint plate can be made ineffective to trigger the projectile to pop out.

[0049] In a specific application, during the simulation, after the form of the parachute and the speed and attitude of the system reach relative stability, the contact between the projectile and the restraint plate is made ineffective, and the projectile pops out under the action of the spring.

[0050] In this application, different stable state criteria can be set according to the actual application environment of the parachute and the projectile. For example, when the speed of the cartridge ammunition system is A and the jitter range of the parachute does not exceed the interval (-B, +B), it is considered that the cartridge ammunition system reaches a stable state. For another example, when the attitude angle of the cartridge ammunition system is stable in the interval (-C, +C) and the parachute is fully opened, it is considered that the cartridge ammunition system reaches a stable state.

[0051] Different stable state criteria can also be set according to different conditions such as the season, geographical environment, and air environment of the actual application of the cartridge ammunition system. This application is not limited thereto.

[0052] In S110, the separation trajectory of the cabin and the projectile is recorded. During the simulation, the trajectory when the cabin and the projectile are separated is recorded, and corresponding indexes such as the speed and pitch angle can also be recorded. More specifically, recording can start before the cabin and the projectile are separated and stop 1 s after the cabin and the projectile are completely separated.

[0053] In S112, when the separation trajectory meets the safety requirements, the design of the cartridge ammunition system is determined. The safety parameters of the delivery process of the cartridge ammunition system can be calculated according to the separation trajectory. The safety parameters include: safety distance, projectile attitude; when the safety parameters meet the safety requirements, the design of the cartridge ammunition system is determined.

[0054] In a specific application, the safety of the separation process can be checked according to the simulation results. More specifically, for example, during the simulation, 0.2 s after the projectile is unlocked, the distance between the cabin and the projectile at this moment is obtained. If the distance between the cabin and the projectile is greater than 0.5 times the length of the projectile, it can be considered that the separation safety requirements are met.

[0055] In another embodiment, during the entire simulation process, the attitude angle change curve of the projectile can be obtained. Through this curve, the jitter range of the projectile's attitude angle can be statistically analyzed, and thus it can provide a decision for the control timing or conditions of the projectile in the real application scenario.

[0056] According to the dispensing design method of the cartridge - loaded projectile system of the present application, by establishing a geometric model of the parachute - object in the cartridge - loaded projectile system, the cartridge - loaded projectile system includes: a flexible parachute, suspension lines, a cabin, and a projectile; performing initial settings on the cartridge - loaded projectile system; performing fluid - structure interaction simulation on the cartridge - loaded projectile system according to the initial settings; during the fluid - structure interaction simulation, after the cartridge - loaded projectile system reaches a stable state, triggering the ejection of the projectile; recording the separation trajectory of the cabin and the projectile; when the separation trajectory meets the safety requirements, determining the design method of the cartridge - loaded projectile system, which can solve the problem that it is difficult to predict the dynamic characteristics of the cartridge - loaded projectile system with a flexible parachute for deceleration during the dispensing and separation stage, establishing a fluid - structure interaction and rigid - flexible coupling simulation method, and improving the prediction accuracy of the separation dynamics of the cartridge - loaded projectile system under complex dynamic conditions.

[0057] It should be clearly understood that the present application describes how to form and use specific examples, but the principles of the present application are not limited to any details of these examples. Instead, based on the teachings disclosed in the present application, these principles can be applied to many other embodiments.

[0058] Figure 2 It is a flowchart of a dispensing design method of a cartridge - loaded projectile system shown according to another exemplary embodiment. Figure 2 The shown process 20 is for Figure 1 a detailed description of S106 "performing fluid - structure interaction simulation on the cartridge - loaded projectile system according to the initial settings" in the shown process.

[0059] As Figure 2 shown, in S202, in the fluid domain, the cartridge - loaded projectile system is simulated according to the initial settings. The fluid domain boundary can be set as a non - reflective boundary; in the fluid domain, the Navier - Stokes equation described by ALE is generated according to the initial settings; the cartridge - loaded projectile system is simulated and calculated according to the Navier - Stokes equation. During the calculation process, based on the grid adaptation technology, the fluid domain grid follows the spatial movement of the cartridge - loaded projectile system.

[0060] The fluid - structure interaction simulation of the cartridge - loaded projectile system can be performed. In the present application, the control equation of the fluid domain can be calculated using the Navier - Stokes equation described by ALE:

[0061]

[0062]

[0063]

[0064] Among them, ρ is the fluid density, u is the fluid velocity, w is the moving velocity of the grid node, and E is the internal energy.

[0065] In S204, the cartridge system is simulated in the structural domain according to the initial settings. Solid mechanics equations of the cartridge system can be generated in the structural domain according to the initial settings; simulation calculations are performed on the cartridge system based on the solid mechanics equations.

[0066] Structural domain simulation can be performed on the cartridge system. In this application, the structural domain control equation can be calculated by the following formula:

[0067]

[0068] Where ρ s is the density of the solid material, y is the displacement vector, f is the body force, and σ s is the Cauchy stress tensor.

[0069] In S206, the interaction between the fluid domain and the structural domain is calculated by the penalty function. The relative distance between the fluid domain nodes and the structural domain nodes can be traced by the penalty function method; coupling forces are applied to the interface of the penetrating substances based on the relative distance.

[0070] In this application, the interaction between the fluid domain and the structural domain is realized by the penalty function method. The penalty function method traces the relative distance d between the fluid domain nodes and the structural domain nodes, and applies coupling forces to the interface of the penetrating substances:

[0071] F i = k i ·d,

[0072] Where k i is the stiffness coefficient based on the master-slave node mass model.

[0073] In this application, the fluid domain boundary is defined as a non-reflecting boundary condition. In this application, the dynamic grid adaptive technology can also be used to make the fluid domain grid move in space following the parachute payload system, thus avoiding dividing a large range of flow field grids and saving the calculation amount.

[0074] Compared with the traditional fluid-structure interaction parachute descent simulation method, in the cartridge system deployment design method of this application, the multi-body separation process of the payload under the parachute is considered, the aerodynamic interference between the separated bodies and between the payload and the flexible parachute is analyzed, and accurate prediction of the separation characteristics of the cartridge system under the flexible parachute is achieved.

[0075] The ejection design method of the cartridge ammunition system of the present application constructs a separated fluid-structure coupling analysis model of the cartridge ammunition system with a flexible parachute, and uses the method of virtual constraint plate contact failure to simulate the process of the projectile body from being constrained to being ejected from the cabin, solving the problem that it is difficult to simulate the dynamic characteristics of the flexible parachute and the multi-body separation dynamics during the separation process of the cartridge ammunition system, and can provide a reference for the design of the cartridge ammunition ejection system.

[0076] The following is an embodiment of applying the ejection design method of the cartridge ammunition system of the present application. Taking the UAV dispensing system decelerated by a cross-shaped parachute as an example, the actual application steps of the present application are described in detail as follows:

[0077] First, establish the geometric model of the cartridge ammunition system decelerated by a cross-shaped parachute as shown in Figure 3 , and define a constraint plate at the exit of the cabin, and this constraint plate does not participate in the fluid-structure coupling.

[0078] Based on the above geometric model, a finite element model of the cartridge ammunition system is constructed. The parachute canopy is divided into shell elements, the suspension lines are divided into discrete beam elements, and the cabin and the projectile body are divided into solid elements. The CFD solver is used in the fluid discipline to divide the fluid grid in the cylindrical area around the parachute and object system, and the fluid grid interpenetrates with the grids of the other parts. The grid layout of the parachute and object system and the flow field is as shown in Figure 4 .

[0079] The mechanical parameters of the parachute canopy material, the suspension line material and the fluid can also be set. Rigid materials are used for the cabin and the projectile body. Then, a spring model is defined between the cabin and the projectile body, and the initial state is the compressed state to provide an ejection force for the projectile body to be ejected from the cabin.

[0080] Furthermore, surface-to-surface contact is defined between the cabin and the projectile body, surface-to-surface contact is adopted between the projectile body and the constraint plate, and fixed contact is used between the constraint plate and the cabin. All contact definitions are implemented using the penalty function.

[0081] The initial velocity of the parachute and object system can also be set according to the actual application environment of the system to carry out fluid-structure coupling simulation. More specifically, the contact between the projectile body and the constraint plate can be made to fail 0.25 after the start of the simulation, and the projectile body is ejected from the cabin under the action of the spring force. After the simulation is completed, the separation motion of the cabin and the projectile body is obtained as shown in Figure 5 .

[0082] Furthermore, the pitch angle change curves of the cabin and the projectile body are as shown in Figure 6 ; the yaw angle change curves of the cabin and the projectile body are as shown in Figure 7 ; the velocity change curves of the cabin and the projectile body are as shown in Figure 8 .

[0083] In actual application, the simulation results can be analyzed from various dimensions. For example, through the distance between the cabin and the missile body, it can be found that there is no collision between the cabin and the missile body during the entire separation process, and the distance between the cabin and the missile body is greater than the safety distance after 0.2s. The posture of the missile body is stable after separation, then it can be considered that the scheme meets the separation safety requirements.

[0084] The following is an embodiment of the design method for launching a barrel loading system of the present application. This embodiment takes a planar circular parachute decelerated UAV deployment system as an example to describe in detail the practical application steps of the present application:

[0085] First, establish the geometric model of the parachute system, such as Figure 9 As shown. A constraint plate is artificially defined at the exit of the cabin, and the constraint plate does not participate in fluid-solid coupling. A finite element model is constructed for the parachute system. The canopy is divided into shell units, the parachute rope is divided into discrete beam units, and the cabin and the missile body are divided into solid units. The fluid discipline uses a CFD solver to divide the fluid grid in the cylindrical area around the parachute system, and the fluid grid is interspersed with the grids of the other parts. The grid arrangement of the parachute system and the flow field is shown in Figure 10 shown.

[0086] The mechanical parameters of the canopy material, the parachute rope material and the fluid can also be further determined. The cabin and the projectile are made of rigid materials. A spring model can be defined between the cabin and the projectile, and the initial state is a compressed state to provide ejection force for the projectile to eject out of the cabin. Face-to-face contact is defined between the cabin and the projectile, face-to-face contact is adopted between the projectile and the constraint plate, and fixed contact is adopted between the constraint plate and the cabin. All contact definitions are implemented using penalty functions.

[0087] You can also set the initial velocity of the parachute system and conduct fluid-solid coupling simulation. After 0.2 seconds from the start of the simulation, the contact between the missile and the constraint plate is invalidated, and the missile is ejected out of the cabin under the force of the spring. After the simulation is completed, the separation motion of the cabin and the missile is obtained as follows: Figure 11 shown.

[0088] Furthermore, the pitch angle variation curves of the cabin and the missile body are as follows: Figure 12 As shown; the yaw angle change curves of the cabin and the missile body are shown in Figure 13 As shown; the velocity variation curves of the cabin and the missile body are as follows Figure 14 shown.

[0089] By analyzing the simulation results, it is found that there is no collision between the cabin and the missile during the entire separation process, and the distance between the cabin and the missile after 0.2s is greater than the safe distance. It is believed that this scheme meets the separation safety requirements. It can also be found through the analysis results that the attitude of the missile is relatively stable, which has little impact on the subsequent missile control, and the missile projection can be executed according to the current scheme.

[0090] In some other embodiments, in the simulation analysis results, if the attitude change of the cabin is relatively drastic, a solution of appropriately reducing the ejection force can be adopted. For example, the launch elastic force can be reduced, the flight speed can be reduced, etc. The present application is not limited thereto.

[0091] Those skilled in the art can understand that all or part of the steps of implementing the above embodiments are implemented as a computer program executed by a CPU. When the computer program is executed by the CPU, the above functions defined by the above method provided by the present application are executed. The program can be stored in a computer-readable storage medium, which can be a read-only memory, a magnetic disk or an optical disc, etc.

[0092] In addition, it should be noted that the above drawings are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, rather than for limiting purposes. It is easy to understand that the processes shown in the above drawings do not indicate or limit the time sequence of these processes. Additionally, it is also easy to understand that these processes can be executed synchronously or asynchronously in, for example, multiple modules.

[0093] The following is an embodiment of the apparatus of the present application, which can be used to execute the method embodiment of the present application. For details not disclosed in the embodiment of the apparatus of the present application, please refer to the method embodiment of the present application.

[0094] Figure 15 is a block diagram of a dispensing design device for a cartridge ammunition system shown according to an exemplary embodiment. As Figure 15 shown, the dispensing design device 150 for the cartridge ammunition system includes: a model module 1502, a setting module 1504, a simulation module 1506, an ejection module 1508, a trajectory module 1510, and a design module 1512.

[0095] The model module 1502 is used to establish a geometric model of the parachute system in the cartridge ammunition system. The cartridge ammunition system includes: a flexible parachute, parachute ropes, a cabin, and a projectile body. The model module 1502 is further used to establish a geometric model of the cartridge ammunition system based on the finite element method; perform model settings on the geometric model of the cartridge ammunition system; and establish a fluid grid around the geometric model of the cartridge ammunition system.

[0096] The setting module 1504 is used to perform initial settings on the cartridge ammunition system; the setting module 1504 is further used to set the densities of the flexible parachute, the parachute ropes, the cabin, and the projectile body; the setting module 1504 is further used to set the mechanical parameters of the flexible parachute, the parachute ropes, the cabin, and the projectile body; the setting module 1504 is further used to set the initial velocities of the flexible parachute, the parachute ropes, the cabin, and the projectile body; the setting module 1504 is further used to set the gravitational fields of the flexible parachute, the parachute ropes, the cabin, and the projectile body.

[0097] The simulation module 1506 is used to perform fluid-structure interaction simulation on the cartridge-loaded ammunition system according to the initial settings; the simulation module 1506 is further used to perform simulation on the cartridge-loaded ammunition system in the fluid domain according to the initial settings; perform simulation on the cartridge-loaded ammunition system in the structural domain according to the initial settings; and calculate the interaction between the fluid domain and the structural domain through the penalty function.

[0098] The ejection module 1508 is used to trigger the ejection of the projectile after the cartridge-loaded ammunition system reaches a stable state during the fluid-structure interaction simulation; the ejection module 1508 is further used to make the contact between the projectile and the restraint plate fail to trigger the ejection of the projectile after the speed, and / or attitude, and / or flexible parachute form of the cartridge-loaded ammunition system is stable.

[0099] The trajectory module 1510 is used to record the separation trajectory of the cabin and the projectile.

[0100] The design module 1512 is used to determine the design of the cartridge-loaded ammunition system when the separation trajectory meets the safety requirements. The design module 1512 is further used to calculate the safety parameters of the delivery process of the cartridge-loaded ammunition system according to the separation trajectory, and the safety parameters include: safety distance, projectile attitude; and determine the design of the cartridge-loaded ammunition system when the safety parameters meet the safety requirements.

[0101] According to the cartridge-loaded ammunition system delivery design device of the present application, by establishing a geometric model of the parachute in the cartridge-loaded ammunition system, the cartridge-loaded ammunition system includes: flexible parachute, parachute rope, cabin, projectile; performing initial settings on the cartridge-loaded ammunition system; performing fluid-structure interaction simulation on the cartridge-loaded ammunition system according to the initial settings; during the fluid-structure interaction simulation, triggering the ejection of the projectile after the cartridge-loaded ammunition system reaches a stable state; recording the separation trajectory of the cabin and the projectile; and determining the design of the cartridge-loaded ammunition system when the separation trajectory meets the safety requirements, it can solve the problem that it is difficult to predict the dynamic characteristics of the cartridge-loaded ammunition system with a flexible parachute during the delivery and separation stage, establish a fluid-structure interaction and rigid-flexible coupling simulation method, and improve the prediction accuracy of the separation dynamics of the cartridge-loaded ammunition system under complex dynamic conditions.

[0102] Figure 16 It is a block diagram of an electronic device shown according to an exemplary embodiment.

[0103] The following refers to Figure 16 to describe the electronic device 1600 according to this embodiment of the present application. Figure 16 The shown electronic device 1600 is only an example and should not impose any restrictions on the functions and usage scope of the embodiments of the present application.

[0104] Such as Figure 16As shown, the electronic device 1600 is presented in the form of a general-purpose computing device. The components of the electronic device 1600 may include, but are not limited to: at least one processing unit 1610, at least one storage unit 1620, a bus 1630 connecting different system components (including the storage unit 1620 and the processing unit 1610), a display unit 1640, etc.

[0105] Among them, the storage unit stores program code, and the program code can be executed by the processing unit 1610, so that the processing unit 1610 executes the steps according to various exemplary embodiments of the present application described in this specification. For example, the processing unit 1610 can execute as Figure 1 , Figure 2 the steps shown in.

[0106] The storage unit 1620 may include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 16201 and / or a cache storage unit 16202, and may further include a read-only storage unit (ROM) 16203.

[0107] The storage unit 1620 may further include a program / utility 16204 having a set (at least one) of program modules 16205. Such program modules 16205 include, but are not limited to: an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include the implementation of a network environment.

[0108] The bus 1630 may represent one or more of several types of bus structures, including a storage unit bus or a storage unit controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0109] The electronic device 1600 can also communicate with one or more external devices 1600' (such as a keyboard, a pointing device, a Bluetooth device, etc.), enabling communication with devices that allow a user to interact with the electronic device 1600, and / or communication with any device (such as a router, a modem, etc.) through which the electronic device 1600 can communicate with one or more other computing devices. Such communication can be carried out through the input / output (I / O) interface 1650. Moreover, the electronic device 1600 can also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through the network adapter 1660. The network adapter 1660 can communicate with other modules of the electronic device 1600 through the bus 1630. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the electronic device 1600, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0110] Through the description of the above embodiments, those skilled in the art can easily understand that the exemplary embodiments described herein can be implemented by software, or by a combination of software and necessary hardware. Therefore, as Figure 17 shown, the technical solution according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, or a network device, etc.) to execute the above method according to the embodiments of the present application.

[0111] The software product can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can, for example, but not be limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0112] The computer-readable storage medium may include a data signal propagated in a baseband or as part of a carrier wave, in which the readable program code is carried. Such a propagated data signal may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. The readable storage medium may also be any readable medium other than the readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0113] The program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages such as Java, C++, etc., and also including conventional procedural programming languages such as the "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, executed as a stand-alone software package, partially on the user computing device and partially on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., by connecting through the Internet using an Internet service provider).

[0114] The above computer-readable medium carries one or more programs, which, when executed by a device, cause the computer-readable medium to implement the following functions: establishing a geometric model of the parachute object in a cartridge ammunition system, the cartridge ammunition system including: a flexible parachute, suspension lines, a cabin, and a projectile; performing an initial setting on the cartridge ammunition system; performing a fluid-structure interaction simulation on the cartridge ammunition system according to the initial setting; during the fluid-structure interaction simulation, after the cartridge ammunition system reaches a stable state, triggering the ejection of the projectile; recording the separation trajectory of the cabin and the projectile; and determining the design of the cartridge ammunition system when the separation trajectory meets the safety requirements.

[0115] Those skilled in the art can understand that the above modules may be distributed in the device according to the description of the embodiments, or may be correspondingly changed and distributed in one or more devices that are uniquely different from the present embodiments. The modules of the above embodiments may be combined into one module, or may be further split into multiple sub-modules.

[0116] Through the description of the above embodiments, those skilled in the art can easily understand that the exemplary embodiments described herein can be implemented by software or by a combination of software and necessary hardware. Therefore, the technical solutions according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on the network, including several instructions to enable a computing device (which can be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the embodiments of the present application.

[0117] The above specifically shows and describes the exemplary embodiments of the present application. It should be understood that the present application is not limited to the detailed structures, settings, or implementation methods described herein; on the contrary, the present application is intended to cover various modifications and equivalent settings included within the spirit and scope of the appended claims.

Claims

1. A design method for the delivery of a cartridge ammunition system, characterized in that, it includes: Establish a geometric model of the parachute in the cartridge ammunition system, and the cartridge ammunition system includes: flexible parachute, suspension lines, cabin, and projectile; Perform initial settings on the cartridge ammunition system; Perform fluid-structure interaction simulation on the cartridge ammunition system according to the initial settings; During the fluid-structure interaction simulation, when the cartridge ammunition system reaches a stable state , trigger the ejection of the projectile; Record the separation trajectory of the cabin and the projectile; When the separation trajectory meets the safety requirements, determine the design of the cartridge ammunition system.

2. The method according to claim 1, characterized in that, Establish the geometric model of the cartridge ammunition system, including: Establish a geometric model of the cartridge ammunition system based on the finite element method; Perform model settings on the geometric model of the cartridge ammunition system; Establish a fluid mesh around the geometric model of the cartridge ammunition system.

3. The method according to claim 2, characterized in that, Perform model settings on the geometric model of the cartridge ammunition system, including: Connect the projectile and the cabin through a spring model; Set a rigid constraint plate at the outlet of the cabin; Set the rigid constraint plate and the projectile to be in face-to-face contact.

4. The method according to claim 2, characterized in that, Establish a fluid mesh around the geometric model of the cartridge ammunition system, further including: The finite element meshes corresponding to the flexible parachute, the suspension lines, the cabin, and the projectile and the fluid mesh are interpenetrated.

5. The method according to claim 1, characterized in that, Perform initial settings on the cartridge ammunition system, including: Set the densities of the flexible parachute, the suspension lines, the cabin, and the projectile; Set the mechanical parameters of the flexible parachute, the suspension lines, the cabin, and the projectile; Set the initial velocities of the flexible parachute, the suspension lines, the cabin, and the projectile; Set the gravitational field of the flexible parachute, the suspension lines, the cabin, and the projectile.

6. The method according to claim 1, characterized in that, Perform fluid-structure interaction simulation on the cartridge ammunition system according to the initial settings, including: Perform simulation on the cartridge ammunition system in the fluid domain according to the initial settings; Perform simulation on the cartridge ammunition system in the structural domain according to the initial settings; Calculate the interaction between the fluid domain and the structural domain through the penalty function.

7. The method according to claim 6, characterized in that, Perform simulation on the cartridge ammunition system in the fluid domain according to the initial settings, including: Set the fluid domain boundary as a non-reflective boundary; Generate the Navier-Stokes equation described by ALE in the fluid domain according to the initial settings; Perform simulation calculations on the cartridge ammunition system according to the Navier-Stokes equation; Based on the grid adaptation technology, make the fluid domain grid follow the spatial movement of the cartridge ammunition system.

8. The method according to claim 6, characterized in that, Perform simulation on the cartridge ammunition system in the structural domain according to the initial settings, including: Generate the solid mechanics equation of the cartridge ammunition system in the structural domain according to the initial settings; Perform simulation calculations on the cartridge ammunition system based on solid mechanics equations.

9. The method according to claim 6, wherein, calculate the interaction between the fluid domain and the structural domain through a penalty function, including: tracking the relative distance between the fluid domain nodes and the structural domain nodes by the penalty function method; apply a coupling force to the penetrating material interface based on the relative distance.

10. The method according to claim 1, wherein, after the cartridge ammunition system reaches a stable state, trigger the ejection of the projectile, including: after the speed, and / or attitude, and / or flexible parachute form of the cartridge ammunition system is stable, make the contact between the projectile and the restraint plate fail to trigger the ejection of the projectile.

11. The method according to claim 1, wherein, when the separation trajectory meets the safety requirements, determine the design of the cartridge ammunition system, including: calculate the safety parameters of the delivery process of the cartridge ammunition system according to the separation trajectory, and the safety parameters include: safety distance, projectile attitude; when the safety parameters meet the safety requirements, determine the design of the cartridge ammunition system.

12. A device for designing the delivery of a cartridge ammunition system, wherein, comprising: a model module for establishing a geometric model of the parachute in the cartridge ammunition system, and the cartridge ammunition system includes: a flexible parachute, parachute ropes, a cabin body, and a projectile; a setting module for performing initial settings on the cartridge ammunition system; a simulation module for performing fluid-structure coupling simulation on the cartridge ammunition system according to the initial settings; an ejection module for triggering the ejection of the projectile after the cartridge ammunition system reaches a stable state during the fluid-structure coupling simulation; a trajectory module for recording the separation trajectory of the cabin body and the projectile; a design module for determining the design of the cartridge ammunition system when the separation trajectory meets the safety requirements.

13. An electronic device, wherein, comprising: one or more processors; a storage device for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 11.

14. A computer-readable medium, on which a computer program is stored, wherein, the program, when executed by a processor, implements the method according to any one of claims 1 to 11.

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