CN112287587A - Simulated microwave heating method, device, equipment and storage medium - Google Patents
Simulated microwave heating method, device, equipment and storage medium Download PDFInfo
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Abstract
The application provides a method, a device, equipment and a storage medium for simulating microwave heating, and relates to the technical field of microwaves. The invention uses a method combining a moving grid algorithm and a implicit function, avoids the repartition of grids and improves the speed of the calculation precision. Determining a target grid corresponding to the mobile unit in the first grid structure at the moment T according to the motion rule of the mobile unit in the microwave cavity; assigning the complex dielectric coefficient or the conductivity of the mobile unit to the target grid, and assigning the complex dielectric coefficient or the conductivity of the materials around the mobile unit to other grids except the target grid in the first grid structure to obtain an expression influencing the distribution of the electromagnetic field in the microwave cavity; and updating to obtain the current electromagnetic field in the microwave cavity at the time T according to an expression influencing the distribution of the electromagnetic field in the microwave cavity so as to calculate the microwave energy absorbed by the medium to be heated in the current electromagnetic field.
Description
Technical Field
The present application relates to the field of microwave technology, and in particular, to a method, an apparatus, a device, and a storage medium for simulating microwave heating.
Background
Microwave heating (Microwave heating) refers to a process of heating an object by using energy characteristics of microwaves. Unlike the conventional heating method of heat transfer, the essence of microwave heating of a dielectric material is: the molecules in the dielectric material absorb microwave energy, and the microwave energy is instantaneously converted into heat energy, so that the temperature is increased.
Because the microwave heating device is closed, the heat conversion condition of the medium material in the microwave heating device and the temperature change condition of the medium material in the microwave heating device cannot be directly obtained, so that the problem that the performance of the newly produced microwave heating device is difficult to detect is caused.
In order to solve the above problems, a computer is used to perform simulation modeling on the process of heating the dielectric material in the microwave heating device, and simulate the dielectric material to absorb microwave energy in the cavity of the microwave heating device, so as to realize the detection of the microwave heating device. The method is environment-friendly and easy to implement. However, the existing method for simulating microwave heating can cause the mesh established by a computer to be distorted, so that the mesh needs to be divided again for many times in the process of simulating microwave heating by a simulation model, and the calculation precision is difficult to guarantee by dividing the mesh for many times.
Disclosure of Invention
The embodiment of the application provides a method, a device, equipment and a storage medium for simulating microwave heating, wherein a grid in the state of a mobile unit can be represented by tracking each time in the microwave heating process, the tracked grid is updated in complex dielectric coefficient or conductivity, the change of electromagnetic field distribution in a microwave heating device is obtained, and then the microwave energy absorption condition of a dielectric material in the microwave heating device is calculated. The simulation of the process of heating the dielectric material in the microwave heating device can not cause the distortion of the grid participating in calculation, and the calculation precision and efficiency are ensured.
In a first aspect, an embodiment of the present application provides a method for simulating microwave heating, where the method includes:
establishing a first grid structure corresponding to the interior of the microwave cavity;
determining at least one target grid corresponding to the mobile unit in the first grid structure at the moment T according to the motion rule of the mobile unit in the microwave cavity; the T moment is any moment in the microwave heating process;
determining a first coefficient of the mobile unit influencing the electromagnetic field distribution in the microwave cavity according to the dielectric property of the mobile unit, and determining a second coefficient of other materials except the mobile unit influencing the electromagnetic field distribution in the microwave cavity according to the dielectric property of the materials around the mobile unit;
assigning the first coefficient to the target grid, and assigning the second coefficient to other grids except the target grid in the first grid structure to obtain an expression influencing the electromagnetic field distribution in the microwave cavity;
and updating to obtain the current electromagnetic field inside the microwave cavity at the time T according to the expression influencing the distribution of the electromagnetic field inside the microwave cavity, so as to calculate the microwave energy absorbed by the medium to be heated under the current electromagnetic field.
Optionally, the method further comprises:
establishing a moving grid according to the outline boundary of the mobile unit;
establishing a second grid structure comprising the moving grid;
determining at least one target grid corresponding to the mobile unit in the first grid structure at the moment T according to the motion rule of the mobile unit in the microwave cavity, wherein the determining comprises the following steps:
determining a coordinate change rule of the mobile grid in the second grid structure according to a motion rule of the mobile unit in the microwave cavity;
calculating a plurality of first location coordinates of the mobile unit in the second mesh structure at the T time;
mapping the first position coordinates to the first grid structure to obtain second position coordinates of the mobile unit in the first grid structure at the time T;
constructing a bounding region in the first mesh structure based on the plurality of second location coordinates;
taking the grid in the boundary area as a target grid corresponding to the mobile unit at the T time.
Optionally, constructing a bounding region in the first mesh structure according to the plurality of second location coordinates comprises:
substituting the second position coordinates into a preset implicit function to construct the boundary area; wherein, the preset implicit function is shown as formula (1):
φ(r)＝d(r)＝min(|r-r1|) (1)；
(1) in the formula, r1Is any one of the second position coordinates, and r is the position coordinate of any grid;
taking the grid in the boundary area as a target grid corresponding to the mobile unit at the T time, including:
setting a preset threshold value;
calculating the minimum distance between any grid and the boundary area;
and when the minimum distance is smaller than the preset threshold value, determining the arbitrary grid as the target grid.
Optionally, the method further comprises:
obtaining a moving area inside the microwave cavity according to the moving range of the moving unit inside the microwave cavity;
establishing a first grid structure corresponding to an inner portion of a microwave cavity, comprising:
establishing a third grid structure corresponding to the moving area;
establishing the first lattice structure including the third lattice structure;
assigning the second coefficients to the grids in the first grid structure except the target grid, including:
and assigning the second coefficient to other grids except the target grid in the third grid structure.
Optionally, assigning the first coefficient to the target grid, and assigning the second coefficient to other grids in the first grid structure except for the target grid, to obtain an expression affecting the distribution of the electromagnetic field in the microwave cavity, including:
defining equation (2) by the implicit function;
(2) in the formula ofmoveIs a first coefficient, εsurroundIs a second coefficient;
when r is the target grid, the target grid is divided into a plurality of grids by H
Set to 0, when r is not the target grid, will go through H
And setting the value to be 1, and obtaining an expression for influencing the distribution of the electromagnetic field in the microwave cavity.
A second aspect of embodiments of the present application provides a simulated microwave heating apparatus, the apparatus comprising:
the first grid establishing module is used for establishing a first grid structure corresponding to the inner part of the microwave cavity;
the target grid determining module is used for determining at least one target grid corresponding to the mobile unit in the first grid structure at the moment T according to the motion rule of the mobile unit in the microwave cavity; the T moment is any moment in the microwave heating process;
the coefficient determining module is used for determining a first coefficient of the mobile unit influencing the electromagnetic field distribution in the microwave cavity according to the dielectric property of the mobile unit; determining a second coefficient of other materials except the mobile unit, which influence the electromagnetic field distribution in the microwave cavity, according to the dielectric properties of the materials around the mobile unit;
the evaluation module is used for evaluating the first coefficient for the target grid and evaluating the second coefficient for other grids except the target grid in the first grid structure to obtain an expression influencing the distribution of the electromagnetic field in the microwave cavity;
and the updating module is used for updating and obtaining the current electromagnetic field in the microwave cavity at the time T according to the expression influencing the electromagnetic field distribution in the microwave cavity so as to calculate the microwave energy absorbed by the medium to be heated under the current electromagnetic field.
Optionally, the apparatus further comprises:
a mobile grid establishing module, configured to establish a mobile grid according to the contour boundary of the mobile unit;
a second mesh establishing module for establishing a second mesh structure comprising the mobile mesh;
the target grid determination module comprises:
the coordinate change determining submodule is used for determining a coordinate change rule of the moving grid in the second grid structure according to a motion rule of the moving unit in the microwave cavity;
a calculation submodule, configured to calculate a plurality of first position coordinates of the mobile unit in the second mesh structure at the T time;
a mapping sub-module, configured to map the multiple first position coordinates to the first grid structure, so as to obtain multiple second position coordinates of the mobile unit in the first grid structure at the time T;
a construction sub-module for constructing a bounding region in the first mesh structure based on the plurality of second location coordinates;
a target mesh determination sub-module for taking the mesh in the boundary area as a target mesh corresponding to the mobile unit at the T time.
Optionally, the building submodule comprises:
the construction subunit is used for substituting the second position coordinates into a preset implicit function to construct the boundary area; wherein, the preset implicit function is shown as formula (1):
φ(r)＝d(r)＝min(|r-r1|) (1)；
(1) in the formula, r1Is any one of the second position coordinates, and r is the position coordinate of any grid;
the target grid determining submodule includes:
the setting subunit is used for setting a preset threshold value;
a calculation subunit, configured to calculate a minimum distance between an arbitrary mesh and the boundary region;
and the target grid determining subunit is configured to determine the arbitrary grid as the target grid when the minimum distance is smaller than the preset threshold.
Optionally, the apparatus further comprises:
the moving area obtaining module is used for obtaining a moving area in the microwave cavity according to the moving range of the moving unit in the microwave cavity;
the first mesh establishing module comprises:
the first grid establishing submodule is used for establishing a third grid structure corresponding to the moving area;
a second mesh establishing submodule for establishing the first mesh structure including the third mesh structure;
the assignment module comprises:
and the assignment submodule is used for assigning the second coefficient to other grids except the target grid in the third grid structure.
Optionally, the assignment module further includes:
a definition submodule for defining the expression (2) by the implicit function;
(2) in the formula ofmoveIs a first coefficient, εsurroundIs a second coefficient;
an expression determination submodule for determining the expression of the target grid by H when r is the target grid
Set to 0, when r is not the target grid, will go through H
And setting the value to be 1, and obtaining an expression for influencing the distribution of the electromagnetic field in the microwave cavity.
A third aspect of embodiments of the present application provides a readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the steps in the method according to the first aspect of the present application.
A fourth aspect of the embodiments of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the method according to the first aspect of the present application.
The first grid structure is established corresponding to the structure of the microwave cavity of the microwave heating device and the actual placing position of the material in the microwave cavity. As the microwave heating time increases, the grid corresponding to the mobile unit is tracked in the first grid structure, i.e. the grid of the mobile unit can be represented at different heating times. And updating the complex dielectric coefficient or the electric conductivity coefficient of the grid representing the mobile unit at different heating moments, calculating an expression influencing the distribution of the electromagnetic field in the microwave cavity based on the grid with the updated complex dielectric coefficient or electric conductivity coefficient, combining Maxwell equations to obtain the electromagnetic field in the microwave cavity at different heating moments, simulating the influence of the mobile unit on the distribution of the electromagnetic field in the microwave cavity, further calculating the microwave energy absorbed by the dielectric material in the continuously changing electromagnetic field to obtain the temperature change of the dielectric material, and checking whether the parameters such as the power coefficient set in the newly produced microwave heating device are suitable for actual heating. Compared with the existing method for simulating microwave heating through a computer, the method realizes the tracking of the mobile unit by utilizing the mobile grid, constructs the boundary area where the target grid is located by utilizing the implicit function and combining the tracked position of the mobile unit, directly updates the complex dielectric coefficient or the conductivity of the mobile unit for the grid in the boundary area, avoids the repeated division of the grid, and improves the speed of the calculation precision.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is an exemplary diagram of a microwave heating device to be tested;
FIG. 2 is a flow chart illustrating steps of simulating microwave heating according to an embodiment of the present application;
FIG. 3 is an exemplary diagram of a first grid structure in accordance with an embodiment of the present application;
FIG. 4 is a flow chart of determining a target grid according to an embodiment of the present application;
FIG. 5 is a flowchart of the steps for determining a target grid according to an embodiment of the present application;
fig. 6 is a partially enlarged view of the moving unit;
FIG. 7 is an exemplary diagram of a second grid structure in accordance with an embodiment of the present application;
fig. 8 is a schematic structural diagram of a simulated microwave heating device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is an exemplary view of a microwave heating apparatus to be tested. The microwave heating device a of fig. 1 includes a microwave emitting mechanism 11, a moving unit 12, a microwave cavity 13, a dielectric material 14, and the like; the microwave emitting mechanism may be composed of a magnetron, a transformer and a fan, and may further include other components, which are not limited in this embodiment. Of course, the microwave heating device also has an electric control system, a door body part and the like. The mobile unit refers to a device for equalizing the electromagnetic field distribution at the location of the dielectric material in the microwave cavity, such as a microwave stirrer, a tray, etc. The dielectric material at the bottom of the microwave cavity is a medium capable of absorbing microwave energy and converting it into heat energy, such as potatoes, yams and the like.
The microwave emitted by the microwave emitting mechanism is combined with the microwave cavity, and the stress is used for establishing enough uniform electromagnetic field modes in the microwave cavity. However, since the microwave cavity cannot be made too large in a practical microwave heating apparatus, i.e. a microwave oven, the electromagnetic field pattern that can be practically established within the cavity is limited and non-uniform. In order to obtain good heating uniformity, some auxiliary measures can be adopted in the microwave cavity, a moving unit can be arranged in the microwave cavity, and the electromagnetic field distribution in the microwave cavity is adjusted through the moving unit.
In addition, the microwave energy that the dielectric material can absorb is determined by the electromagnetic field of the dielectric material and the dielectric coefficient thereof, so in order to heat the dielectric material uniformly, the microwave heating device is provided with the moving unit, the size of the electromagnetic field of the dielectric material in the microwave cavity is periodically changed, and the uniform heating of the dielectric material is realized.
Because the microwave heating device is working, the microwave cavity is closed, the state of the medium material in the microwave cavity can not be directly obtained, and the newly produced microwave heating device can not be tested. For example, developers have designed microwave heating devices with new power coefficients, but have not determined whether the newly designed power coefficients are beneficial for heating the dielectric material in practical applications. The above problem is solved by a simulation method, specifically, a mesh model for simulating an actual microwave cavity is established by using a professional tool (such as a finite element mesh model, etc.), and microwave energy absorbed by a dielectric material is calculated through the mesh model. However, in practical application, due to the adoption of the moving grid algorithm, in the process of simulating microwave heating, in order to adjust the distorted grid, the grid in the grid model needs to be continuously re-divided, so that the calculation speed is slowed down, and the calculation accuracy is reduced.
In view of the above problem, an embodiment of the present invention provides a simulated microwave heating method, which is capable of tracking a grid representing a state of a mobile unit at each time during a microwave heating process, updating complex dielectric coefficients or electrical conductivities of the tracked grid, obtaining a change of electromagnetic field distribution in a microwave heating device, and calculating an absorption condition of microwave energy of a dielectric material in the microwave heating device.
Referring to fig. 2, fig. 2 is a flowchart of steps of simulating microwave heating according to an embodiment of the present application.
Step S21: establishing a first grid structure corresponding to the interior of the microwave cavity;
fig. 3 is an exemplary diagram of a first grid structure according to an embodiment of the present application. The first mesh structure shown in fig. 3 is a finite element mesh model established corresponding to the microwave heating device a to be detected shown in fig. 1. For different components in the microwave heating device a to be detected, the first grid structure, namely the grid size, the grid density and the grid distribution in the finite element grid model are also different. 31 is a grid structure corresponding to the microwave emitting mechanism 11 of the microwave heating device a to be detected, 32 is a grid structure corresponding to the moving unit 12 of the microwave heating device a to be detected, 33 is a grid structure corresponding to the dielectric material 14 placed in the microwave heating device a to be detected, and in the first grid structure, the other grids except 31, 32 and 33 correspond to the air in the microwave cavity 13.
After the distribution condition of the electromagnetic field in the microwave cavity is obtained, the size of the electromagnetic field corresponding to each grid in the first grid structure is obtained, and the microwave energy absorbed by different grids in 33 is calculated according to the dielectric coefficients corresponding to different grids in 33, so that the temperature rise conditions of different grids in 33 are obtained.
Step S22: determining at least one target grid corresponding to the mobile unit in the first grid structure at the moment T according to the motion rule of the mobile unit in the microwave cavity; the T moment is any moment in the microwave heating process;
the motion rule of the mobile unit in the microwave cavity can be the rotating speed, the rotating direction and the like of the mobile unit. The target mesh is a mesh of corresponding mobile units in the first mesh structure, and in the embodiment of the present application, the target mesh is time-varying.
Taking the microwave heating device a to be detected shown in fig. 1 as an example, the moving unit is a stirrer, a rule that a position W of the stirrer in the microwave cavity changes with time can be established according to a rotating speed of the stirrer, the current time T is obtained at intervals of a preset time along with the finite element mesh model simulating the microwave heating, the time T is substituted into the rule that the position W changes with time, which meshes correspond to the stirrer in the first mesh structure at the current time T are obtained, and positions of the meshes are obtained.
The preset time may be 1 second, 0.5 second, etc., and the specific value may be set according to the calculation accuracy. Assuming that the time of the microwave heating process using the finite element mesh model is 10 seconds, the values of T are 0 second, 0.5 second, 1 second … … 9.5.5 second, and 10 seconds, respectively, and at each of the above determined times, the target mesh of the stirrer in the first mesh structure is determined, so as to update the dielectric constants or the conductivities of the different meshes in the first mesh structure.
Step S23: determining a first coefficient of the mobile unit influencing the electromagnetic field distribution in the microwave cavity according to the dielectric property of the mobile unit, and determining a second coefficient of other materials except the mobile unit influencing the electromagnetic field distribution in the microwave cavity according to the dielectric property of the materials around the mobile unit;
when the mobile unit is non-metallic, such as a tray, the dielectric properties of the mobile unit are expressed in terms of dielectric constant. When the mobile unit is metal, for example a stirrer, the dielectric properties of the mobile unit are expressed in terms of electrical conductivity. The first factor is the dielectric constant of the tray or the conductivity of the stirrer. The second coefficient is the dielectric constant of the air in the microwave cavity.
The microwave cavity is internally provided with a moving unit, a medium to be heated and various gases filled in the microwave cavity, wherein the materials around the moving unit refer to the gases around the moving unit, and further can be the gases filled in a sphere which takes the center of the moving unit as the origin and has the radius of 2.
In particular, the material surrounding the mobile unit may be air in the microwave cavity. The other materials except the moving unit can be air in the microwave cavity or a mixture of the air in the microwave cavity and gas obtained after heating a medium material, wherein the medium material can be potatoes, tomatoes and the like.
Step S24: assigning the first coefficient to the target grid, and assigning the second coefficient to other grids except the target grid in the first grid structure to obtain an expression influencing the electromagnetic field distribution in the microwave cavity;
step S25: and updating to obtain the current electromagnetic field inside the microwave cavity at the time T according to the expression influencing the distribution of the electromagnetic field inside the microwave cavity, so as to calculate the microwave energy absorbed by the medium to be heated under the current electromagnetic field.
The expression of the electromagnetic field distribution can be substituted into a Maxwell equation set to obtain the current electromagnetic field in the microwave cavity at the time T. Taking the values of T as 0 second, 0.5 second, 1 second … … 9.5.5 second and 10 seconds as examples, the change of the electromagnetic field distribution in the microwave cavity along with the time can be established in the microwave heating process of 10 seconds.
The values of the time T are different along with the proceeding of the simulated microwave heating, the dielectric coefficient or the conductivity corresponding to the same grid in the first grid structure can be correspondingly changed at different times, the values are consistent with the proceeding of the actual microwave heating, the positions of the mobile units are different at different times, the range of the mobile units is different from the dielectric constant or the conductivity of other positions, and further the electromagnetic fields of the dielectric materials in the microwave cavity are different, so that the calculation is carried out on each grid with the updated dielectric coefficient or conductivity at the time T, and the sizes of the electromagnetic fields at different positions in the microwave cavity at the time T can be obtained in the grid finite element model.
The dielectric coefficient of the medium to be heated is known, and the temperature change condition of the medium to be heated along with the time can be obtained after the change condition of the electromagnetic field distribution along with the time is obtained through calculation.
The first grid structure is established corresponding to the structure of the microwave cavity of the microwave heating device and the actual placing position of the material in the microwave cavity. As the microwave heating time increases, the grid corresponding to the mobile unit is tracked in the first grid structure, i.e. the grid of the mobile unit can be represented at different heating times. And updating the complex dielectric coefficient or the electric conductivity coefficient of the grid representing the mobile unit at different heating moments, calculating an expression influencing the distribution of the electromagnetic field in the microwave cavity based on the grid with the updated complex dielectric coefficient or electric conductivity coefficient, combining Maxwell equations to obtain the electromagnetic field in the microwave cavity at different heating moments, simulating the influence of the mobile unit on the distribution of the electromagnetic field in the microwave cavity, further calculating the microwave energy absorbed by the dielectric material in the continuously changing electromagnetic field to obtain the temperature change of the dielectric material, and checking whether the parameters such as the power coefficient set in the newly produced microwave heating device are suitable for actual heating. Compared with the existing method for simulating microwave heating through a computer, the method realizes the tracking of the mobile unit by utilizing the mobile grid, constructs the boundary area where the target grid is located by utilizing the implicit function and combining the tracked position of the mobile unit, directly updates the complex dielectric coefficient or the conductivity of the mobile unit for the grid in the boundary area, avoids the repeated division of the grid, and improves the speed of the calculation precision.
Another embodiment of the present application proposes a specific method for implementing step 21 "determining at least one target cell corresponding to the mobile unit in the first mesh structure at time T", so as to track a specific location of the mobile unit, and be embodied in the first mesh structure.
Referring to fig. 4 and 5, fig. 4 is a flowchart of determining a target grid according to an embodiment of the present application, and fig. 5 is a flowchart of determining a target grid according to an embodiment of the present application.
Step S51: establishing a moving grid according to the outline boundary of the mobile unit;
referring to fig. 6, fig. 6 is a partially enlarged view of the moving unit, that is, fig. 6 is a partially enlarged view of the moving unit 12 shown in fig. 1.
As shown in fig. 6, the moving unit is a fan structure composed of three fan-shaped blades. The outline boundary of the moving unit may refer to the boundary of the fan structure.
Step S52: establishing a second grid structure comprising the moving grid;
fig. 7 is an exemplary diagram of a second grid structure according to an embodiment of the present application. As shown in fig. 7, the second mesh structure comprises a moving mesh 71, the moving mesh 71 corresponding to the outline boundary of the mobile unit shown in fig. 6. The second grid structure does not directly participate in the calculation to move the grid to track the real-time position of the mobile unit, and the real-time position of the mobile unit can be obtained without affecting the calculation accuracy.
Step S53: determining a coordinate change rule of the mobile grid in the second grid structure according to a motion rule of the mobile unit in the microwave cavity;
the rotation speed, rotation period, rotation direction of the moving mesh in the second mesh structure may be set according to the rotation period, rotation direction, rotation speed of the moving unit.
Step S54: calculating a plurality of first location coordinates of the mobile unit in the second mesh structure at the T time;
t takes different values, and the positions of the mobile units in the microwave cavity are different, so the positions of the mobile grids corresponding to the mobile units in the second grid structure are also different. The first position coordinates are coordinates of the moving grid in a coordinate system established in the second grid structure.
At least one of the moving grids, each of the moving grids having a first location coordinate.
The moving grid occupies a plurality of grids in the second grid structure, thereby obtaining a plurality of first position coordinates.
Taking the flowchart shown in FIG. 4 as an example, (x)1,y1) Coordinate axis is a coordinate system established by a second grid structure, 41 is a moving grid, the moving grid rotates according to the motion rule of the moving unit, and the coordinate of the point Q at the time T is represented by (X)Q 10) is updated to (X)Q 2，YQ 1) The coordinate of the point P is represented by (0, Y)P 1) Is updated to (X)P 1，Yp 2)。
Step S55: mapping the first position coordinates to the first grid structure to obtain second position coordinates of the mobile unit in the first grid structure at the time T;
the second position coordinates are coordinates of the moving grid under a coordinate system established by the first grid structure, and the moving grid is established corresponding to the shape and the appearance of the moving unit and can represent the moving unit in a finite element model, so that the plurality of first position coordinates are mapped to the first grid structure in a generalized mapping mode, and the real-time position of the moving unit in the first grid structure can be obtained.
Continuing with the flowchart shown in fig. 4 as an example, at time T, the coordinates of the moving grid in the coordinate system established by the second grid structure are mapped to the coordinate system established by the first grid structure. I.e., put the Q point (X)Q 2，YQ 1) To (x)2,y2) Coordinate axis, obtaining the coordinate of Q point as (X)Q 3，YQ 2) Point P (X)P 1，Yp 2) To (x)2,y2) Coordinate axis, obtaining the coordinate of P point as (X)P 2，Yp 3). The Q point and the P point are obtained as the above points and are (x)2,y2) Similar method of position coordinates under coordinate axes can obtain that each point of the moving grid is in the first grid structure, namely (x)2,y2) Position coordinates under the coordinate axis.
Step S56: constructing a bounding region in the first mesh structure based on the plurality of second location coordinates;
the boundary region is a region surrounded by a plurality of grids corresponding to the plurality of second position coordinates.
The boundary region may specifically be constructed using implicit functions. And substituting the second position coordinates into a preset implicit function. The preset implicit function is shown as the formula (1):
φ(r)＝d(r)＝min(|r-r1|) (1)；
(1) in the formula, r1Is any one of the second position coordinates, and r is the position coordinate of any grid; d (r) is a distance function with a dependent variable of r. For any one of the grids in the first grid structure, the shortest distance of the grid to the plurality of second position coordinates is calculated. Position coordinate r1And the position coordinate r are both representations of vectors. Substituting the coordinates of the grid in the first grid structure into min (| r-r)1L) (1); and checking whether the relation between the grid and the second position coordinates accords with a preset distance function, and if the grid accords with the distance function, determining the grid as a boundary point enclosing a boundary area. After all the boundary points are confirmed, the area enclosed by the boundary points is the boundary area.
Continuing with the flowchart shown in FIG. 4 as an example, the coordinate of the point P is (X)P 2，Yp 3) Calculating grid N (X) in the second grid structureN，YN) The relationship with point P is min (| (X)N，YN)-(XP 2，Yp 3) Let min (| (X) be assumed)N，YN)-(XP 2，Yp 3) I) and a distance function d (X)N，YN) Coincidence, then grid N (X)N，YN) Are boundary points that can be enclosed into a boundary region.
Step S57: taking the grid in the boundary area as a target grid corresponding to the mobile unit at the T time.
Judging whether the grid in the first grid structure is located in the boundary area according to the position relation of the grid and the boundary point sitting in the grid, specifically:
setting a preset threshold value; calculating the minimum distance between any grid and the boundary area; and when the minimum distance is smaller than the preset threshold value, determining the arbitrary grid as the target grid.
The preset threshold may be at least one threshold established for different bounding regions.
In one example, the fan-shaped outline of the mobile unit corresponds to the mobile grid of the mobile unit, and then the boundary area defined by the plurality of second positions in the first grid structure is also fan-shaped, or other irregular situations.
In another example, the moving unit is a circular tray, and then the moving grid corresponding to the moving unit is also circular, and the boundary area defined by the plurality of second positions in the first grid structure is also circular.
In the example shown in fig. 4, the moving grid corresponding to the moving unit is a square, and the boundary area defined by the plurality of second locations in the first grid structure is also a square. Taking the boundary area of the square in fig. 4 as an example, the preset threshold may be four thresholds established for four sides of the square, that is, thresholds established for boundaries in four different directions.
The calculation of the minimum distance between the arbitrary mesh and the boundary area means that a plurality of distances between the arbitrary mesh and the plurality of second position coordinates are calculated, and the minimum distance is selected from the plurality of distances. And when the minimum distance is smaller than a preset threshold value, the arbitrary grid is positioned in the boundary area.
According to the embodiment of the application, a second grid structure and a moving grid moving in a second grid node are established according to the movement of a moving unit in a microwave cavity, the position of the moving unit is tracked through the moving grid, the tracked position is mapped to a first grid structure established by a simulated microwave cavity, and under the condition that the shape and the distribution of the grid in the first grid structure are not changed, the target grid corresponding to the moving unit in the first grid structure at each moment of microwave heating is obtained, so that a foundation is provided for updating the complex dielectric coefficient and the conductivity of the grid in the first grid structure.
In addition to the method for tracking the target grid provided by the embodiment of the application, the position of the mobile unit can be tracked by using a level set method, the boundary position change of the mobile unit in the whole moving process is represented by a mathematical function, the boundaries of a plurality of grids representing the mobile unit are obtained, and the grids in the boundaries are determined as the target grids.
Another embodiment of the present application provides a method of obtaining an expression that affects electromagnetic field distribution within a microwave cavity.
After determining the target grid, defining a formula (2) by the implicit function; i.e. an expression for the complex permittivity or conductivity with a dependent variable r is established in terms of phi (r).
And assigning a first coefficient to the target grid in the boundary area, and assigning a second coefficient to the grid outside the boundary area.
(2) In the formula ofmoveIs a first coefficient, εsurroundIs a second coefficient;
when r is the target grid, the target grid is divided into a plurality of grids by H
Set to 0, when r is not the target grid, will go through H
And setting the value to be 1, and obtaining an expression for influencing the distribution of the electromagnetic field in the microwave cavity.
Another embodiment of the present application sets forth another method of establishing a first grid structure.
Firstly, obtaining a moving area in the microwave cavity according to the moving range of the moving unit in the microwave cavity; when a first grid structure corresponding to the inner part of the microwave cavity is established, the following steps are specifically executed: establishing a third grid structure corresponding to the moving area; then establishing the first grid structure containing the third grid structure; when the second coefficient is assigned to the grids other than the target grid in the first grid structure, the second coefficient may be assigned only to the grids other than the target grid in the third grid structure.
The moving range of the mobile unit in the microwave cavity is regular and unchangeable, the moving area is obtained according to the actual moving range of the mobile unit in the microwave cavity, the grid range which is possibly a target grid is determined according to the moving area, and only the grid in the grid range is updated with the first coefficient or the second coefficient, so that the calculated amount is reduced, the calculation efficiency is improved, and the process of detecting the produced microwave heating device is more efficient.
Based on the same inventive concept, the embodiment of the application provides a simulated microwave heating device. Referring to fig. 8, fig. 8 is a schematic structural diagram of a simulated microwave heating apparatus according to an embodiment of the present application. The device includes:
a first grid establishing module 81, configured to establish a first grid structure corresponding to an inner portion of the microwave cavity;
a target grid determining module 82, configured to determine, according to a motion rule of a mobile unit in the microwave cavity, at least one target grid corresponding to the mobile unit in the first grid structure at time T; the T moment is any moment in the microwave heating process;
a coefficient determination module 83, configured to determine, according to the dielectric property of the mobile unit, a first coefficient of the mobile unit affecting the electromagnetic field distribution inside the microwave cavity; determining a second coefficient of other materials except the mobile unit to influence the electromagnetic field distribution in the microwave cavity according to the dielectric properties of the materials around the mobile unit;
an assigning module 84, configured to assign the first coefficient to the target grid, and assign the second coefficient to other grids in the first grid structure except for the target grid, so as to obtain an expression affecting distribution of the electromagnetic field inside the microwave cavity;
and the updating module 85 is configured to update the current electromagnetic field inside the microwave cavity at the time T according to the expression affecting the distribution of the electromagnetic field inside the microwave cavity, so as to calculate the microwave energy absorbed by the medium to be heated in the current electromagnetic field.
Optionally, the apparatus further comprises:
a mobile grid establishing module, configured to establish a mobile grid according to the contour boundary of the mobile unit;
a second mesh establishing module for establishing a second mesh structure comprising the mobile mesh;
the target grid determination module comprises:
the coordinate change determining submodule is used for determining a coordinate change rule of the moving grid in the second grid structure according to a motion rule of the moving unit in the microwave cavity;
a calculation submodule, configured to calculate a plurality of first position coordinates of the mobile unit in the second mesh structure at the T time;
a mapping sub-module, configured to map the multiple first position coordinates to the first grid structure, so as to obtain multiple second position coordinates of the mobile unit in the first grid structure at the time T;
a construction sub-module for constructing a bounding region in the first mesh structure based on the plurality of second location coordinates;
a target mesh determination sub-module for taking the mesh in the boundary area as a target mesh corresponding to the mobile unit at the T time.
Optionally, the building submodule comprises:
the construction subunit is used for substituting the second position coordinates into a preset implicit function to construct the boundary area; wherein, the preset implicit function is shown as formula (1):
φ(r)＝d(r)＝min(|r-r1|) (1)；
(1) in the formula, r1Is any one of the second position coordinates, and r is the position coordinate of any grid;
the target grid determining submodule includes:
the setting subunit is used for setting a preset threshold value;
a calculation subunit, configured to calculate a minimum distance between an arbitrary mesh and the boundary region;
and the target grid determining subunit is configured to determine the arbitrary grid as the target grid when the minimum distance is smaller than the preset threshold.
Optionally, the apparatus further comprises:
the moving area obtaining module is used for obtaining a moving area in the microwave cavity according to the moving range of the moving unit in the microwave cavity;
the first mesh establishing module comprises:
the first grid establishing submodule is used for establishing a third grid structure corresponding to the moving area;
a second mesh establishing submodule for establishing the first mesh structure including the third mesh structure;
the assignment module comprises:
and the assignment submodule is used for assigning the second coefficient to other grids except the target grid in the third grid structure.
Optionally, the assignment module further includes:
a definition submodule for defining the expression (2) by the implicit function;
(2) in the formula ofmoveIs a first coefficient, εsurroundIs a second coefficient;
an expression determination submodule for determining the expression of the target grid by H when r is the target grid
Set to 0, when r is not the target grid, will go through H
And setting the value to be 1, and obtaining an expression for influencing the distribution of the electromagnetic field in the microwave cavity.
Based on the same inventive concept, another embodiment of the present application provides a readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps in the simulated microwave heating method according to any of the above embodiments of the present application.
Based on the same inventive concept, another embodiment of the present application provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and running on the processor, and when the processor executes the computer program, the method of simulating microwave heating according to any of the above embodiments of the present application is implemented.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive or descriptive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one of skill in the art, embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus, and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The above description has been made in detail on a method, an apparatus, a device and a storage medium for simulating microwave heating provided by the present application, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A method of simulating microwave heating, the method comprising:
establishing a first grid structure corresponding to the interior of the microwave cavity;
determining at least one target grid corresponding to the mobile unit in the first grid structure at the moment T according to the motion rule of the mobile unit in the microwave cavity; the T moment is any moment in the microwave heating process;
determining a first coefficient of the mobile unit influencing the electromagnetic field distribution in the microwave cavity according to the dielectric property of the mobile unit, and determining a second coefficient of other materials except the mobile unit influencing the electromagnetic field distribution in the microwave cavity according to the dielectric property of the materials around the mobile unit;
assigning the first coefficient to the target grid, and assigning the second coefficient to other grids except the target grid in the first grid structure to obtain an expression influencing the electromagnetic field distribution in the microwave cavity;
and updating to obtain the current electromagnetic field inside the microwave cavity at the time T according to the expression influencing the distribution of the electromagnetic field inside the microwave cavity, so as to calculate the microwave energy absorbed by the medium to be heated under the current electromagnetic field.
2. The method of claim 1, further comprising:
establishing a moving grid according to the outline boundary of the mobile unit;
establishing a second grid structure comprising the moving grid;
determining at least one target grid corresponding to the mobile unit in the first grid structure at the moment T according to the motion rule of the mobile unit in the microwave cavity, wherein the determining comprises the following steps:
determining a coordinate change rule of the mobile grid in the second grid structure according to a motion rule of the mobile unit in the microwave cavity;
calculating a plurality of first location coordinates of the mobile unit in the second mesh structure at the T time;
mapping the first position coordinates to the first grid structure to obtain second position coordinates of the mobile unit in the first grid structure at the time T;
constructing a bounding region in the first mesh structure based on the plurality of second location coordinates;
taking the grid in the boundary area as a target grid corresponding to the mobile unit at the T time.
3. The method of claim 2, wherein constructing a bounding region in the first mesh structure based on the plurality of second location coordinates comprises:
substituting the second position coordinates into a preset implicit function to construct the boundary area; wherein, the preset implicit function is shown as formula (1):
φ(r)＝d(r)＝min(|r-r1|) (1)；
(1) in the formula, r1Is any one of the second position coordinates, and r is the position coordinate of any grid;
taking the grid in the boundary area as a target grid corresponding to the mobile unit at the T time, including:
setting a preset threshold value;
calculating the minimum distance between any grid and the boundary area;
and when the minimum distance is smaller than the preset threshold value, determining the arbitrary grid as the target grid.
4. The method of claim 1, further comprising:
obtaining a moving area inside the microwave cavity according to the moving range of the moving unit inside the microwave cavity;
establishing a first grid structure corresponding to an inner portion of a microwave cavity, comprising:
establishing a third grid structure corresponding to the moving area;
establishing the first lattice structure including the third lattice structure;
assigning the second coefficients to the grids in the first grid structure except the target grid, including:
and assigning the second coefficient to other grids except the target grid in the third grid structure.
5. The method of claim 3, wherein assigning the first coefficient to the target mesh and assigning the second coefficient to meshes of the first mesh structure other than the target mesh to obtain an expression that affects electromagnetic field distribution within the microwave cavity, comprises:
defining equation (2) by the implicit function;
(2) in the formula ofmoveIs a first coefficient, εsurroundIs a second coefficient;
when r is the target grid, the target grid is divided into a plurality of grids by H
Set to 0, when r is not the target grid, will go through H
And setting the value to be 1, and obtaining an expression for influencing the distribution of the electromagnetic field in the microwave cavity.
6. An analog microwave heating device, comprising:
the first grid establishing module is used for establishing a first grid structure corresponding to the inner part of the microwave cavity;
the target grid determining module is used for determining at least one target grid corresponding to the mobile unit in the first grid structure at the moment T according to the motion rule of the mobile unit in the microwave cavity; the T moment is any moment in the microwave heating process;
the coefficient determining module is used for determining a first coefficient of the mobile unit influencing the electromagnetic field distribution in the microwave cavity according to the dielectric property of the mobile unit; determining a second coefficient of other materials except the mobile unit, which influence the electromagnetic field distribution in the microwave cavity, according to the dielectric properties of the materials around the mobile unit;
the evaluation module is used for evaluating the first coefficient for the target grid and evaluating the second coefficient for other grids except the target grid in the first grid structure to obtain an expression influencing the distribution of the electromagnetic field in the microwave cavity;
and the updating module is used for updating and obtaining the current electromagnetic field in the microwave cavity at the time T according to the expression influencing the electromagnetic field distribution in the microwave cavity so as to calculate the microwave energy absorbed by the medium to be heated under the current electromagnetic field.
7. The apparatus of claim 1, further comprising:
a mobile grid establishing module, configured to establish a mobile grid according to the contour boundary of the mobile unit;
a second mesh establishing module for establishing a second mesh structure comprising the mobile mesh;
the target grid determination module comprises:
the coordinate change determining submodule is used for determining a coordinate change rule of the moving grid in the second grid structure according to a motion rule of the moving unit in the microwave cavity;
a calculation submodule, configured to calculate a plurality of first position coordinates of the mobile unit in the second mesh structure at the T time;
a mapping sub-module, configured to map the multiple first position coordinates to the first grid structure, so as to obtain multiple second position coordinates of the mobile unit in the first grid structure at the time T;
a construction sub-module for constructing a bounding region in the first mesh structure based on the plurality of second location coordinates;
a target mesh determination sub-module for taking the mesh in the boundary area as a target mesh corresponding to the mobile unit at the T time.
8. The apparatus of claim 7, wherein the building module comprises:
the construction subunit is used for substituting the second position coordinates into a preset implicit function to construct the boundary area; wherein, the preset implicit function is shown as formula (1):
φ(r)＝d(r)＝min(|r-r1|) (1)；
(1) in the formula, r1Is any one of the second position coordinates, and r is the position coordinate of any grid;
the target grid determining submodule includes:
the setting subunit is used for setting a preset threshold value;
a calculation subunit, configured to calculate a minimum distance between an arbitrary mesh and the boundary region;
and the target grid determining subunit is configured to determine the arbitrary grid as the target grid when the minimum distance is smaller than the preset threshold.
9. A readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executed implements the steps of the method according to any of claims 1-5.
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