Simulation evaluation method, device and equipment for wet area of part and medium

Abstract

The invention discloses a simulation evaluation method, device and equipment for the wet area of a part and a medium, and the method comprises the steps: obtaining a meshless structure model of each part in an area where a film is located, and then carrying out the water spraying simulation of the model according to a parameter corresponding to the water spraying operation of a film pasting technology, and obtaining a water spraying simulation model; and after the water flow path of the water flow particles in the model is identified, the wet water area of each part is determined according to the position of the water flow path in the model corresponding to each part. According to the method, simulation processing is carried out by utilizing a meshless model, and grid adjustment and grid reconstruction are not needed, so that the influence of grids can be avoided and eliminated, and the evaluation precision can be effectively improved; moreover, by identifying the movement path of the water flow particles and evaluating the wet water area according to the position of the path on the part, the actual flowing condition of the water flow on each part can be fitted, and then area evaluation is carried out according to the actual condition, so that the evaluation precision can be further improved, and the evaluation error can be further reduced.

Description

Background Art

[0002] Auto tint film is a thin film (such as solar film or heat-insulating film) pasted on the front and rear windshields, side windows and sunroof of a vehicle. The multiple process steps of film pasting involve spraying water inside the car, which will inevitably be sprayed or scraped onto places other than the glass. Excess water can easily penetrate into the interior of the car, causing the risk of short circuit or failure of various parts after being wetted by water.

[0003] Therefore, it is necessary to simulate the wetted area of ​​each part during the film application process in order to optimize the subsequent film application process. One commonly used method is to use the traditional finite volume method to perform mesh simulation of automotive parts to simulate the film application of the car, determine the flow area of ​​the excess water flow in the mesh simulation part and the water capacity in the area during the film application simulation process, and then evaluate the wetted area of ​​the parts in the area based on the water flow capacity.

[0004] However, the commonly used methods currently have the following technical problems: the capacity can only evaluate the wetted area of ​​parts in a single area, but the various parts in the car are overlapped and spliced ​​with each other, and water may flow in different parts, causing the position and direction of the water flow to constantly change, thereby increasing the wetted area of ​​each part, making the evaluation results of the above simulation evaluation method deviate greatly from the actual results, and the accuracy of the evaluation and identification is low; and the grid-based automobile parts require grid adjustment and grid reconstruction during evaluation, which will eliminate the water in the grid gaps and further reduce the accuracy of the evaluation. Summary of the invention

[0005] The present invention proposes a simulation evaluation method, device, equipment and medium for the wetted area of ​​a part. The method can solve the technical problems that the evaluation results of the existing simulation technology have a large deviation from the actual results and the evaluation accuracy is low.

[0006] A first aspect of an embodiment of the present invention provides a simulation evaluation method for a wetted area of ​​a part, the method comprising:

[0007] After obtaining the native structure model, a water spray simulation is performed on the native structure model according to preset particle parameters to obtain a water spray simulation model, wherein the native structure model includes a gridless structure model of each part in the film-mounting area, and the preset particle parameters are parameters set according to the water spray operation of the film-mounting process;

[0008] After identifying the water flow path of the water flow particles in the water spray simulation model, the wetted area of ​​each part is determined according to the position of the water flow path at each part corresponding to the model.

[0009] The present invention can obtain a gridless structural model of each part in the area where the film is located, and then simulate the model for water spraying according to the parameters corresponding to the water spraying operation of the film-sticking process to obtain a water spraying simulation model; after identifying the water flow path of the water flow particles in the model, the wetted area of ​​each part is determined according to the position of the water flow path at the corresponding model of each part. The present invention uses a gridless model for simulation processing, and does not require grid adjustment and grid reconstruction, which can avoid eliminating the influence of the grid and can effectively improve the accuracy of the evaluation; and the present invention identifies the path of the movement of the water flow particles and evaluates the wetted area according to the position of the path at the part, which can fit the actual flow of water in each part, and then perform area evaluation according to the actual situation, which can further improve the accuracy of the evaluation and reduce the error of the evaluation.

[0010] In combination with the first aspect, in one implementation, the water spray simulation is performed on the native structure model according to preset particle parameters to obtain a water spray simulation model, including:

[0011] Discretizing the water jet into a series of water flow particles according to the preset particle parameters, and establishing a constraint relationship between adjacent water flow particles, wherein the constraint relationship is a force relationship between the discrete water flow particles and the adjacent water flow particles;

[0012] The property parameters of each water flow particle in the original structure model are adjusted to obtain a water spray simulation model, wherein the property parameters include the initial diameter, encrypted diameter, density, viscosity, and tension coefficient of the particle.

[0013] In combination with the first aspect, in one implementation, the identifying the water flow path of the water flow particles in the water spray simulation model includes:

[0014] Acquire position coordinates from the water spray simulation model, wherein the position coordinates are the position coordinates of each water flow particle at each moment;

[0015] Connect the position coordinates corresponding to each water flow particle to obtain the water flow path corresponding to each water flow particle.

[0016] In combination with the first aspect, in one implementation, obtaining position coordinates from the water spray simulation model includes:

[0017] Obtaining the position vector and velocity vector of each water flow particle in the water spray simulation model;

[0018] The position coordinates of each water flow particle are calculated using the position vector and the velocity vector.

[0019] In combination with the first aspect, in one implementation, the calculation operation of the position vector includes:

[0020] The position vector of each water particle in the water spray simulation model is calculated using the following formula:

[0021] r i (t+Δt)=r i (t)+v i (t)△t;

[0022] t is time, Δt is the time step, r i is the position vector, v i is the velocity vector, and i is the index of the water flow particle.

[0023] In combination with the first aspect, in one implementation, determining the wetted area of ​​each part according to the water flow path at a position of each part corresponding to the model includes:

[0024] Determine a target model according to the position of the water flow path, wherein the target model is a gridless structural model of a part in contact with the water flow path;

[0025] The number of water flow particles of each target model is counted to obtain the wetted area of ​​each part.

[0026] In combination with the first aspect, in one implementation, after the step of determining the wetted area of ​​each part at the position of each part corresponding to the model according to the water flow path, the method further includes:

[0027] The mesh-free structural model of each wetted part is visualized, and the wetted area corresponding to the wetted area is highlighted.

[0028] A second aspect of an embodiment of the present invention provides a simulation evaluation device for a wetted area of ​​a part, the device comprising:

[0029] A simulation module is used for performing water spray simulation on the native structure model according to preset particle parameters after obtaining the native structure model to obtain a water spray simulation model, wherein the native structure model includes a gridless structure model of each part in the film-mounting area, and the preset particle parameters are parameters set according to the water spray operation of the film-mounting process;

[0030] The area evaluation module is used to identify the water flow path of the water flow particles in the water spray simulation model, and then determine the wetted area of ​​each part according to the position of the water flow path at each part corresponding to the model.

[0031] In combination with the second aspect, in one implementation, the water spray simulation is performed on the native structure model according to the preset particle parameters to obtain the water spray simulation model, including:

[0032] Discretizing the water jet into a series of water flow particles according to the preset particle parameters, and establishing a constraint relationship between adjacent water flow particles, wherein the constraint relationship is a force relationship between the discrete water flow particles and the adjacent water flow particles;

[0033] The property parameters of each water flow particle in the original structure model are adjusted to obtain a water spray simulation model, wherein the property parameters include the initial diameter, encrypted diameter, density, viscosity, and tension coefficient of the particle.

[0034] In conjunction with the second aspect, in one implementation, the identifying a water flow path of water flow particles in the water spray simulation model includes:

[0035] Acquire position coordinates from the water spray simulation model, wherein the position coordinates are the position coordinates of each water flow particle at each moment;

[0036] Connect the position coordinates corresponding to each water flow particle to obtain the water flow path corresponding to each water flow particle.

[0037] In conjunction with the second aspect, in one implementation, obtaining position coordinates from the water spray simulation model includes:

[0038] Obtaining the position vector and velocity vector of each water flow particle in the water spray simulation model;

[0039] The position coordinates of each water flow particle are calculated using the position vector and the velocity vector.

[0040] In conjunction with the second aspect, in one implementation, the calculation operation of the position vector includes:

[0041] The position vector of each water particle in the water spray simulation model is calculated using the following formula:

[0042] r i (t+Δt)=r i (t)+v i (t)Δt;

[0043] t is time, Δt is the time step, r i is the position vector, v i is the velocity vector, and i is the index of the water flow particle.

[0044] In conjunction with the second aspect, in one implementation, determining the wetted area of ​​each part according to the water flow path at a position of each part corresponding to the model includes:

[0045] Determine a target model according to the position of the water flow path, wherein the target model is a gridless structural model of a part in contact with the water flow path;

[0046] The number of water flow particles of each target model is counted to obtain the wetted area of ​​each part.

[0047] In conjunction with the second aspect, in one implementation, the device further includes:

[0048] A display module is used to visualize the grid-free structural model of each wetted part and highlight the wetted area corresponding to the wetted area after the step of determining the wetted area of ​​each part at the position of the model corresponding to each part according to the water flow path.

[0049] Compared with the prior art, the simulation evaluation method, device, equipment and medium of the wetted area of ​​a part provided by the embodiment of the present invention has the following beneficial effects: the present invention can obtain the gridless structural model of each part in the film-applying area, and then simulate the model with water spraying according to the parameters corresponding to the water spraying operation of the film-applying process to obtain a water spraying simulation model; after identifying the water flow path of the water flow particles in the model, the wetted area of ​​each part is determined according to the position of the water flow path at the corresponding model of each part. The present invention uses a gridless model for simulation processing, and does not require grid adjustment and grid reconstruction, which can avoid eliminating the influence of the grid and can effectively improve the accuracy of the evaluation; and the present invention can identify the path of the movement of the water flow particles, evaluate the wetted area according to the position of the path at the part, and can fit the actual flow of water in each part, and then perform area evaluation according to the actual situation, which can further improve the accuracy of the evaluation and reduce the error of the evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a flow chart of a simulation evaluation method of a part wetted area provided by an embodiment of the present invention;

[0051] Figure 2 It is a schematic diagram of the model structure of a simulation case of front windshield film application provided by an embodiment of the present invention;

[0052] Figure 3 is a motion schematic diagram of a water flow particle release source provided by an embodiment of the present invention;

[0053] Figure 4 is a schematic diagram of the influence radius of water flow particles provided by an embodiment of the present invention;

[0054] Figure 5 is a schematic diagram of a water flow path of a water flow particle provided by an embodiment of the present invention;

[0055] Figure 6 It is a structural schematic diagram of parts visualization provided by an embodiment of the present invention;

[0056] Figure 7It is an operation flow chart of a simulation evaluation method of a part wetted area provided by one embodiment of the present invention;

[0057] Figure 8 It is a structural schematic diagram of a simulation evaluation device for a part wetted area provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] Auto tint film is a thin film (such as solar film or heat-insulating film) pasted on the front and rear windshields, side windows and sunroof of a vehicle. As auto tint film can filter out ultraviolet rays in sunlight to reduce damage to items and people in the car caused by ultraviolet rays, it can also reduce heat conduction, prevent sudden glass shattering, and protect personal privacy, so more and more car owners are applying auto tint film to their cars.

[0060] The process of applying film to cars includes cleaning the inner wall of the glass, spraying water to moisten the film, pasting the film, draining the film, cutting the film, and drying and shaping. Among them, many process steps involve spraying water inside the car, and it is inevitable that the water will be sprayed or scraped to places other than the glass during the process. For example, when spraying water on the front windshield, the water will flow to the wiring harness, module and other key parts under the dashboard area; for example, when spraying water on the side door glass, the water will flow to the glass lift switch, ambient light, speaker and other electrical appliances.

[0061] The passenger compartment and the interior of the car are dry areas. Excess water will penetrate into the interior of the car and make various parts wet. However, the waterproof level of the parts is low. After getting wet, there is a risk of short circuit or failure of various parts in the car, which will cause the car to malfunction or become unusable, increasing the risk of use for users. Therefore, it is necessary to simulate the wet area of ​​each part during the film application process in order to optimize the subsequent film application process steps to reduce the risk of parts getting wet due to film application. The commonly used simulation method is: use the traditional finite volume method to perform grid simulation of automotive parts to simulate car film application, determine the flow area of ​​excess water in the grid simulation parts and the water capacity in the area during the simulated film application process, and then evaluate the wet area of ​​the parts in the area based on the water flow capacity.

[0062] However, the commonly used methods currently have the following technical problems: the capacity can only evaluate the wetted area of ​​parts in a single area, but the various parts in the car are overlapped and spliced ​​with each other, and water may flow in different parts, causing the position and direction of the water flow to constantly change, thereby increasing the wetted area of ​​each part, making the evaluation results of the above simulation evaluation method deviate greatly from the actual results, and the accuracy of the evaluation and identification is low; and the grid-based automobile parts require grid adjustment and grid reconstruction during evaluation, which will eliminate the water in the grid gaps and further reduce the accuracy of the evaluation.

[0063] In order to solve the above problems, a simulation evaluation method, device, equipment and medium for the wetted area of ​​a part provided in an embodiment of the present application will be introduced and explained in detail through the following specific embodiments.

[0064] Reference Figure 1 , showing a flow chart of a simulation evaluation method for a part wetted area provided by an embodiment of the present invention.

[0065] Wherein, as an example, the simulation evaluation method of the wetted area of ​​the part may include:

[0066] S11. After obtaining the native structure model, a water spray simulation is performed on the native structure model according to preset particle parameters to obtain a water spray simulation model, wherein the native structure model includes a gridless structure model of each part in the film-mounting area, and the preset particle parameters are parameters set according to the water spray operation of the film-mounting process.

[0067] In one embodiment, the grid-free structural model of each part of the automobile may be obtained. In order to simulate the influence of the film on each part, the grid-free structural model of each part in the area where the film is located may be obtained.

[0068] In the specific operation, the CAD geometric models of the dashboard, front windshield, A-pillar trim, front body, door, door trim, and various electronic and electrical parts can be obtained to obtain the grid-free structural model of each part.

[0069] Traditional finite volume analysis methods require geometric processing and meshing of CAD models, which takes a lot of time and the deformation of geometric features caused by pre-processing has a great impact on the accuracy of such simulations. The meshless particle method described in this patent can directly use the native CAD model, because the meshless method discretizes the connected medium into a series of particles, each particle represents a part of the medium, carrying properties such as mass, position, and velocity.

[0070] Reference Figure 2 , shows a schematic diagram of the model structure of a front windshield film simulation case provided by an embodiment of the present invention.

[0071] In the above way, this discretization method does not require pre-defined grids, because particles themselves are the basic units of calculation, so the gridless particle method can use the original CAD model and retain all small models and complete structural features, such as small models such as rubber strips and glue coatings, gaps between panel joints, the position and width of glue coatings, and the fillet of sheet metal. Figure 2 As shown. Through the above method, the real physical geometric relationship can be restored, which can improve the modeling efficiency and reduce the calculation accuracy error caused by mesh quality problems. After the model is built, the physical parameters of the part are set according to the material of the part itself, including material density, surface roughness, etc.

[0072] After obtaining the native structure model, the particle parameters preset by the user can be determined, and the particle parameters are parameters set according to the water spraying operation of the film lamination process.

[0073] Then, the water spray simulation can be performed on the native structure model according to the preset particle parameters, so that the native structure model becomes a water spray simulation model.

[0074] In order to adapt to the actual situation of car film pasting, the above-mentioned original structure model can be converted into a state after film pasting. As an example, the water spraying simulation is performed on the original structure model according to the preset particle parameters to obtain the water spraying simulation model, which may include the following sub-steps:

[0075] S111. Discretize the water jet into a series of water flow particles according to the preset particle parameters, and establish a constraint relationship between adjacent water flow particles, wherein the constraint relationship is the force relationship between the discretized water flow particles and the adjacent water flow particles.

[0076] S112, adjusting the property parameters of each water flow particle in the original structure model to obtain a water spray simulation model, wherein the property parameters include an initial diameter, a densified diameter, a density, a viscosity, and a tension coefficient of the particle.

[0077] In one embodiment, the preset particle parameters may be parameters of the water flow particle release source: position, angle, water volume, initial water spray velocity, etc.

[0078] Reference Figure 3 , shows a schematic diagram of the movement of a water particle release source provided by an embodiment of the present invention. For example, the user can pre-set the water particle release source at a position 60 mm away from the upper left corner of the sprayed glass and perpendicular to the glass, that is, the water spray outlet of the kettle when applying the film. Set the spray angle, water volume and initial velocity of the water particle release source, and set the water particle release source to move in a "Z" shape, such as Figure 3 shown.

[0079] The movement range of water particles and the amount of water sprayed require that the water spray can cover the entire piece of sprayed glass. In the actual film application process, two water sprays are required, the first to clean the glass and the second to wet the glass to facilitate film application. Therefore, the simulation process also needs to be set to simulate two water sprays, with an interval of 30 seconds between the two water sprays. Due to differences in body structure and parts layout of different models, and different body structure and parts layout states at different stages of automobile design, a fixed film simulation method is used to identify the risk of parts wetting under different body structures and layout states of the same model. By identifying risks, the body structure and parts layout are guided and optimized.

[0080] After determining the preset particle parameters, the continuous water flow ejected by the water flow particle release source can be discretized into a series of particles according to the preset particle parameters, and a constraint relationship between adjacent water flow particles can be established; the constraint relationship is the force relationship between the discrete water flow particles and the adjacent water flow particles, such as pressure, adhesion, etc., and the water flow particles will move under these constraint conditions.

[0081] Reference Figure 4 , which shows a schematic diagram of the influence radius of water flow particles provided by an embodiment of the present invention. Figure 4 As shown in the figure, there is a concept of influence radius between water flow particles. e The radius of influence is the radius of influence. e The other water flow particles are all neighbor water flow particles of water flow particle i. The larger the influence radius of the water flow particle, the more neighbor water flow particles there are, but the amount of calculation will also increase; conversely, although the amount of calculation is reduced, it may cause the accuracy of the direct calculation to decrease, so the influence radius selected here is about three times the diameter of the water flow particle.

[0082] Next, the attribute parameters of each water flow particle in the original structure model can be adjusted to obtain a water spray simulation model. Specifically, the attribute parameters include the initial diameter, encrypted diameter, density, viscosity, tension coefficient and other parameters of the particle.

[0083] For example, the initial diameter and the encrypted diameter of the water flow particles are set. The initial diameter is the initial diameter of the water flow ejected from the particle release source in the above step after being discretized into particles. The encrypted diameter is the particle diameter after the water flow particles pass through or arrive at the area after encryption is set in the key area (a single water flow particle is split into multiple water flow particles with smaller diameters). Based on the influence radius of the water flow particles, the encrypted diameter of the water flow particles is usually 1 / 3 of the minimum gap that needs to be paid attention to in the model. For example: if the assembly gap between the instrument panel and the A-pillar trim is 0.5mm, the encrypted diameter is set to 0.15mm.

[0084] After setting the attribute parameters of each water flow particle, the simulation software can adjust the position of the water flow particles according to their attribute parameters, so that the position of the water flow particles changes in the native structure model, thereby converting the native structure model into a water spray simulation model.

[0085] S12, after identifying the water flow path of the water flow particles in the water spray simulation model, determine the wetted area of ​​each part according to the position of the water flow path at each part corresponding to the model.

[0086] In one embodiment, since the positions of water flow particles in the model are constantly changing, the position changes of water flow particles in the water spray simulation model can be identified to determine the movement path of the water flow particles, thereby obtaining the water flow path.

[0087] After determining the water flow path, the part model that the water flow path contacts can be determined, and the part corresponding to this part model is the wetted part. Then, the wetted area of ​​each part can be determined based on the size of the area where the water flow path contacts each part model.

[0088] In order to accurately determine the path of the water flow particles, as an example, the identifying the water flow path of the water flow particles in the water spray simulation model may include the following sub-steps:

[0089] S21. Acquire position coordinates from the water spray simulation model, where the position coordinates are the position coordinates of each water flow particle at each moment.

[0090] S22. Connect the position coordinates corresponding to each water flow particle to obtain the water flow path corresponding to each water flow particle.

[0091] In one embodiment, the position coordinates of each water flow particle in the water spray simulation model may be obtained, and the position coordinates are the position coordinates corresponding to each water flow particle at each moment in the water spray simulation model.

[0092] Assuming that the simulation lasts for 1 minute, the position coordinates of each water particle in the water spray simulation model every second can be obtained.

[0093] Next, the position coordinates corresponding to each water flow particle can be obtained according to the time sequence to obtain the water flow path corresponding to each water flow particle. Referring to the above example, assuming that the simulation is simulated for 1 minute and a position coordinate is obtained every second, each water flow particle obtains 60 position coordinates. The 60 position coordinates can be connected in sequence, and the connected path is the water flow path.

[0094] In the Lagrangian particle method, each particle has a position vector and a velocity vector. In order to determine the position coordinates according to its vector, as an example, the obtaining of the position coordinates from the water spray simulation model may include the following sub-steps:

[0095] S211, obtaining the position vector and velocity vector of each water flow particle in the water spray simulation model.

[0096] S212. Calculate the position coordinates of each water flow particle using the position vector and the velocity vector.

[0097] In the specific operation, the position vector and velocity vector of each water particle in the water spray simulation model can be obtained. Then the position vector at the next moment is calculated by the position vector and velocity vector at the current moment and the interval time. Finally, the position coordinates at the next moment can be obtained by solving the position vector at the next moment. Specifically, the position vector at the next moment can be converted into a coordinate point according to the coordinate system of the model to obtain the position coordinates. If the current moment is the starting moment, its position coordinates can be the coordinates of the starting position.

[0098] In one embodiment, the calculation operation of the position vector may include the following sub-steps:

[0099] The position vector of each water particle in the water spray simulation model is calculated using the following formula:

[0100] r i (t+Δt)=r i (t)+v i (t)Δt;

[0101] t is time, Δt is the time step, r i is the position vector, v i is the velocity vector, and i is the index of the water flow particle.

[0102] Reference Figure 5 , showing a schematic diagram of the water flow path of water flow particles provided by an embodiment of the present invention.

[0103] In actual operation, by selecting a specific water flow particle and connecting the coordinate positions within a specified time period, the motion trajectory of the particle can be obtained, that is, the water flow path can be obtained. Through the water flow path, the source of the water flow can be visually observed. Figure 5 As shown, after the calculation is completed, the water flow particles around the gear are selected to identify where the water flow particles flowing near the gear come from during the period from the start of the calculation to the time when the water flow particles flow near the gear. The dots in the figure are water flow particles, and the lines extending from the particles are the movement paths of the particles, that is, the water flow paths.

[0104] In order to accurately determine the wetted area of ​​each part, as an example, the wetted area of ​​each part is determined at the position of each part corresponding to the model according to the water flow path, which may include the following sub-steps:

[0105] S31. Determine a target model according to the position of the water flow path, wherein the target model is a gridless structure model of a part in contact with the water flow path.

[0106] S32, counting the number of water flow particles of each target model to obtain the wetted area of ​​each part.

[0107] Before identifying the wet area of ​​a part, it is necessary to determine whether the part is wet. Specifically, you can first determine whether the position of the part model overlaps with the position coordinates of the water flow path; if there is an overlap, it is determined that the water flow particles are in contact with the surface of the part model, and the target model can be obtained. At this time, the wet position and wet area of ​​the part model can be identified, and then the wet risk of the part can be evaluated.

[0108] In the specific operation, in the meshless particle method, the geometric meshless structure model will be converted into particles for calculation, and each particle carries physical quantities, such as coordinate position, mass, velocity, pressure, etc. Through the contact between water flow particles and geometric particles, the position of the geometric particles in contact can be determined, that is, the wet position in the part can be obtained. Finally, by counting the number of geometric particles in contact with the fluid particles, the total contact area can be obtained, and the wet area can be obtained.

[0109] In order to further help the user check the wetted parts so as to optimize the film application process according to the position and area of ​​the wetted parts, as an example, after the step of determining the wetted area of ​​each part at the position of each part corresponding to the model according to the water flow path, the method may further include the following steps:

[0110] S13, visualizing the gridless structural model of each wetted part, and highlighting the wetted area corresponding to the wetted area.

[0111] Reference Figure 6 , showing a schematic structural diagram of part visualization provided by an embodiment of the present invention.

[0112] In the specific operation, the wet water particles are highlighted in the visual interactive interface of the simulation software, so that the wet water area of ​​the part can be visually observed, such as Figure 6 As shown in the figure, the area with a coverage ratio of 1 is a wet area. After the calculation is completed, the gear locally presents a coverage ratio of 1, indicating that the area is wet.

[0113] According to the wetting moment, the fluid particles in contact with the geometric particles are selected by visual observation in the visual interactive interface, and the motion path of the specified particles is generated in the manner described above, so that the water flow path that causes the parts to be wetted can be obtained.

[0114] Through the above-mentioned visualization method, an intuitive optimization basis can be provided for unreasonable water flow paths during film-sticking simulation.

[0115] Reference Figure 7 , shows an operation flow chart of a simulation evaluation method for a part wetted area provided by an embodiment of the present invention.

[0116] Specifically, the operation of the simulation evaluation method for the wetted area of ​​a part may include the following steps:

[0117] The first step is the simulation analysis of car film.

[0118] The second step is to establish the geometric model required for film pasting.

[0119] The third step is to assign material and physical properties to the geometric model.

[0120] The fourth step is to discretize the connected water flow into a series of particles.

[0121] The fifth step is to define the location, spray angle, spray volume and initial spray velocity of the film spray source.

[0122] Step 6: Solve the velocity, pressure, coordinates and other parameters of the fluid example.

[0123] The seventh step is to identify the movement path of fluid particles, that is, to identify the water flow path.

[0124] Step 8: Output the calculation results.

[0125] In this embodiment, the embodiment of the present invention provides a simulation evaluation method for the wetted area of ​​a part, and its beneficial effect is that: the present invention can obtain a gridless structural model of each part in the film-applying area, and then simulate the model for water spraying according to the parameters corresponding to the water spraying operation of the film-applying process to obtain a water spraying simulation model; after identifying the water flow path of the water flow particles in the model, the wetted area of ​​each part is determined according to the position of the water flow path at the corresponding model of each part. The present invention uses a gridless model for simulation processing, and does not require grid adjustment and grid reconstruction, which can avoid eliminating the influence of the grid and can effectively improve the accuracy of the evaluation; and the present invention can identify the path of the movement of the water flow particles, and evaluate the wetted area according to the position of the path at the part, which can fit the actual flow of water in each part, and then perform area evaluation according to the actual situation, which can further improve the accuracy of the evaluation and reduce the error of the evaluation.

[0126] The embodiment of the present invention also provides a simulation evaluation device for the wetted area of ​​a part, see Figure 8 , showing a schematic structural diagram of a simulation evaluation device for a part wetted area provided by an embodiment of the present invention.

[0127] Wherein, as an example, the simulation evaluation device of the wetted area of ​​the part may include:

[0128] The simulation module 801 is used to perform water spray simulation on the native structure model according to preset particle parameters after obtaining the native structure model, so as to obtain a water spray simulation model, wherein the native structure model includes a gridless structure model of each part in the film-mounting area, and the preset particle parameters are parameters set according to the water spray operation of the film-mounting process;

[0129] The area evaluation module 802 is used to identify the water flow path of the water flow particles in the water spray simulation model, and then determine the wetted area of ​​each part according to the position of the water flow path at each part corresponding to the model.

[0130] Optionally, the water spraying simulation is performed on the native structure model according to preset particle parameters to obtain a water spraying simulation model, including:

[0131] Discretizing the water jet into a series of water flow particles according to the preset particle parameters, and establishing a constraint relationship between adjacent water flow particles, wherein the constraint relationship is a force relationship between the discrete water flow particles and the adjacent water flow particles;

[0132] The property parameters of each water flow particle in the original structure model are adjusted to obtain a water spray simulation model, wherein the property parameters include the initial diameter, encrypted diameter, density, viscosity, and tension coefficient of the particle.

[0133] Optionally, the identifying the water flow path of water flow particles in the water spray simulation model includes:

[0134] Acquire position coordinates from the water spray simulation model, wherein the position coordinates are the position coordinates of each water flow particle at each moment;

[0135] Connect the position coordinates corresponding to each water flow particle to obtain the water flow path corresponding to each water flow particle.

[0136] Optionally, acquiring position coordinates from the water spray simulation model includes:

[0137] Obtaining the position vector and velocity vector of each water flow particle in the water spray simulation model;

[0138] The position coordinates of each water flow particle are calculated using the position vector and the velocity vector.

[0139] Optionally, the calculation operation of the position vector includes:

[0140] The position vector of each water particle in the water spray simulation model is calculated using the following formula:

[0141] ri (t+Δt)=r i (t)+v i (t)Δt;

[0142] t is time, Δt is the time step, r i is the position vector, v i is the velocity vector, and i is the index of the water flow particle.

[0143] Optionally, determining the wetted area of ​​each part according to the water flow path at a position of each part corresponding to the model includes:

[0144] Determine a target model according to the position of the water flow path, wherein the target model is a gridless structural model of a part in contact with the water flow path;

[0145] The number of water flow particles of each target model is counted to obtain the wetted area of ​​each part.

[0146] Optionally, the device further comprises:

[0147] A display module is used to visualize the grid-free structural model of each wetted part and highlight the wetted area corresponding to the wetted area after the step of determining the wetted area of ​​each part at the position of the model corresponding to each part according to the water flow path.

[0148] Those skilled in the art can clearly understand that, for the sake of convenience and brevity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0149] Furthermore, an embodiment of the present application also provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the simulation evaluation method of the wetted area of ​​a part as described in the above embodiment is implemented.

[0150] Furthermore, an embodiment of the present application also provides a computer-readable storage medium, which stores a computer-executable program, and the computer-executable program is used to enable a computer to execute the simulation evaluation method of the wetted area of ​​a part as described in the above embodiment.

[0151] It should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the embodiments of the present invention and simplifying the description, 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 of the present invention. When an element such as a layer, region or substrate is referred to as being "on" or "above" another element, it can be directly on the other element, or there can also be an intermediate element. On the contrary, when an element is referred to as "directly on" or "above" another element, there is no intermediate element. It should also be understood that when an element is referred to as being "under" or "below" another element, it can be directly under or below the other element, or there can also be an intermediate element. On the contrary, when an element is referred to as being "directly under" or "below" another element, there is no intermediate element. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0152] Those skilled in the art will appreciate that the embodiments of the present application may also provide computer program products. Therefore, the present application may adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application may adopt the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program codes.

[0153] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), apparatuses, and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0154] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0155] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0156] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A simulation evaluation method for a part's wetted area, characterized in that: The method comprises: After obtaining the native structure model, a water spray simulation is performed on the native structure model according to preset particle parameters to obtain a water spray simulation model, wherein the native structure model includes a gridless structure model of each part in the film-mounting area, and the preset particle parameters are parameters set according to the water spray operation of the film-mounting process; After identifying the water flow path of the water flow particles in the water spray simulation model, the wetted area of ​​each part is determined according to the position of the water flow path at each part corresponding to the model.

2. The simulation evaluation method of the wetted area of ​​a part according to claim 1, characterized in that: The water spray simulation is performed on the native structure model according to the preset particle parameters to obtain a water spray simulation model, including: Discretizing the water jet into a series of water flow particles according to the preset particle parameters, and establishing a constraint relationship between adjacent water flow particles, wherein the constraint relationship is a force relationship between the discrete water flow particles and the adjacent water flow particles; The property parameters of each water flow particle in the original structure model are adjusted to obtain a water spray simulation model, wherein the property parameters include the initial diameter, encrypted diameter, density, viscosity, and tension coefficient of the particle.

3. The simulation evaluation method of the wetted area of ​​a part according to claim 1, characterized in that: The step of identifying the water flow path of water flow particles in the water spray simulation model comprises: Acquire position coordinates from the water spray simulation model, wherein the position coordinates are the position coordinates of each water flow particle at each moment; Connect the position coordinates corresponding to each water flow particle to obtain the water flow path corresponding to each water flow particle.

4. The simulation evaluation method of the wetted area of ​​a part according to claim 3, characterized in that: The step of obtaining position coordinates from the water spray simulation model comprises: Obtaining the position vector and velocity vector of each water flow particle in the water spray simulation model; The position coordinates of each water flow particle are calculated using the position vector and the velocity vector.

5. The simulation evaluation method of the wetted area of ​​a part according to claim 4, characterized in that: The calculation operation of the position vector includes: The position vector of each water particle in the water spray simulation model is calculated using the following formula: r i (t+Δt)=r i (t)+v i (t)Δt; t is time, Δt is the time step, r i is the position vector, v i is the velocity vector, and i is the index of the water flow particle.

6. The simulation evaluation method of the wetted area of ​​a part according to claim 1, characterized in that: Determining the wetted area of ​​each part at a position corresponding to the model of each part according to the water flow path includes: Determine a target model according to the position of the water flow path, wherein the target model is a gridless structural model of a part in contact with the water flow path; The number of water flow particles of each target model is counted to obtain the wetted area of ​​each part.

7. The simulation evaluation method for the wetted area of ​​a part according to any one of claims 1 to 6, characterized in that: After the step of determining the wetted area of ​​each part at the position of each part corresponding to the model according to the water flow path, the method further comprises: The mesh-free structural model of each wetted part is visualized, and the wetted area corresponding to the wetted area is highlighted.

8. A simulation evaluation device for a part's wetted area, characterized in that: The device comprises: A simulation module is used for performing water spray simulation on the native structure model according to preset particle parameters after obtaining the native structure model to obtain a water spray simulation model, wherein the native structure model includes a gridless structure model of each part in the film-mounting area, and the preset particle parameters are parameters set according to the water spray operation of the film-mounting process; The area evaluation module is used to identify the water flow path of the water flow particles in the water spray simulation model, and then determine the wetted area of ​​each part according to the position of the water flow path at each part corresponding to the model.

9. An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the simulation evaluation method for the wetted area of ​​a part as described in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer-executable program, and the computer-executable program is used to enable a computer to execute the simulation evaluation method of the wetted area of ​​a part as described in any one of claims 1 to 7.

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