A tofu drying machine drum modeling method, device, equipment and storage medium

Abstract

This application discloses a tow-dryer drum modeling method, apparatus, equipment, and storage medium, relating to the field of model construction technology. The method comprises: obtaining the model structure of each component in the tow-dryer drum and the interface properties of the interfaces between the components; constructing a first target equation corresponding to hot air and a second target equation corresponding to tobacco; constructing a drum wall model corresponding to the tow-dryer based on the first target equation and the model structure, and constructing a tobacco model corresponding to the tow-dryer based on the second target equation and the model structure; wherein the drum wall model and the tobacco model are constructed using the Modelica language; and obtaining a target drum model corresponding to the tow-dryer drum based on the interface properties, the drum wall model, and the tobacco model. By using the Modelica language for block modeling, modeling efficiency and accuracy are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of model building, and in particular to a tofu drying machine drum modeling method, device, equipment and storage medium. Background Art

[0002] Drum dryers are widely used in a variety of fields, including metallurgy, building materials, light industry, and municipal administration. As equipment for drying large quantities of materials, they offer high production efficiency and excellent adaptability. The drying process within a tofu dryer is complex, involving multiple scientific disciplines, including fluid mechanics, thermodynamics, and heat and mass transfer. The internal heat exchange and flow phenomena are highly coupled, with heat exchange, flow, and heat and mass transfer intertwined, leading to significant nonlinearity in the model equations. Extensive numerical simulations are required to validate the design theories and methods. Therefore, it is essential to construct a precise mathematical model for simulation analysis.

[0003] Modelica is a unified modeling language for multiple physical domains, particularly well-suited for complex systems with coupled domains. Unlike traditional modeling methods, Modelica uses equation-based modeling, unconstrained by causal relationships. This allows for effective representation of the interactions between domains within a system, offering advantages such as efficiency, flexibility, and scalability. Therefore, Modelica is ideally suited for the multi-domain modeling and simulation of a drum tofu drying system.

[0004] At present, the finite element method or computational fluid dynamics is usually used to model the tofu drying machine drum. This method cannot take into account both the efficiency and accuracy of model construction. Therefore, how to quickly and accurately construct the model has become a technical problem that needs to be solved. Summary of the Invention

[0005] In view of this, the present invention aims to provide a tofu drying drum modeling method, apparatus, device, and storage medium that can utilize the Modelica language for modular modeling and ultimately synthesize a tofu drying drum model, thereby ensuring the efficiency and accuracy of the generated tofu drying drum model. The specific scheme is as follows:

[0006] In a first aspect, the present application provides a method for modeling a tofu drying drum, comprising:

[0007] Disassembling the target tow-fiber drying drum to obtain the model structure corresponding to each component in the target tow-fiber drying drum and the interface properties corresponding to the interfaces between the components;

[0008] Acquiring first characteristic information corresponding to the hot air in the target tobacco drying drum, constructing a first target equation corresponding to the hot air based on the first characteristic information, and acquiring second characteristic information corresponding to the tobacco in the target tobacco drying drum, constructing a second target equation corresponding to the tobacco based on the second characteristic information;

[0009] A drum wall model corresponding to the target cut tobacco drying machine is constructed according to the first target equation and the model structure, and a cut tobacco model corresponding to the target cut tobacco drying machine is constructed according to the second target equation and the model structure; wherein the drum wall model and the cut tobacco model are models constructed using the Modelica language;

[0010] A target drum model corresponding to the target tobacco drying machine drum is obtained based on the interface attributes, the drum wall model, and the tobacco cut model.

[0011] Optionally, the acquiring a target drum model corresponding to the target tobacco drying drum based on the interface attributes, the drum wall model, and the tobacco cut model includes:

[0012] The target tobacco drying machine drum is discretely modeled based on the interface properties, the drum wall model, and the tobacco cut model to obtain a target drum model corresponding to the target tobacco drying machine drum.

[0013] Optionally, the discrete modeling of the target tow-steel drying machine drum to obtain a target drum model corresponding to the target tow-steel drying machine drum includes:

[0014] Combining the drum wall model and the tobacco cut model to obtain an initial model corresponding to the target tobacco cutter drum;

[0015] The initial model is discretized into a target number of heat exchange units connected end to end to obtain the target drum model corresponding to the target tofu drying machine drum.

[0016] Optionally, obtaining a target drum model corresponding to the target tofu drying drum includes:

[0017] The fluid medium in the target tow dryer drum is analyzed, a medium model corresponding to the target tow dryer drum is constructed based on the corresponding analysis results, and the target drum model corresponding to the target tow dryer drum is obtained based on the medium model.

[0018] Optionally, constructing a tobacco cut model corresponding to the target tobacco cut dryer includes:

[0019] Obtaining a first water vapor equilibrium density corresponding to the hot air and a second water vapor equilibrium density corresponding to the shredded tobacco;

[0020] Based on the first water vapor equilibrium density and the second water vapor equilibrium density, a time derivative calculation equation for the moisture content of the tobacco cut in different working stages of the target tobacco drying machine drum is obtained, and based on each of the time derivative calculation equations for the moisture content, the tobacco cut model corresponding to the target tobacco drying machine is constructed.

[0021] Optionally, obtaining a first water vapor equilibrium density corresponding to the hot air and a second water vapor equilibrium density corresponding to the shredded tobacco includes:

[0022] The relative humidity of the hot air is obtained based on the temperature of the hot air, and the water vapor equilibrium humidity of the tobacco is calculated using the Hendersen correlation equation;

[0023] The first water vapor equilibrium density corresponding to the hot air is obtained according to the relative humidity and the preset water vapor equilibrium density calculation formula, and the second water vapor equilibrium density corresponding to the tobacco is obtained according to the water vapor equilibrium humidity and the preset water vapor equilibrium density calculation formula.

[0024] Optionally, after obtaining the target drum model corresponding to the target tofu drying drum, the method further includes:

[0025] The target drum model corresponding to the target tobacco drying machine drum is connected to a preset simulation component to construct a corresponding test simulation system, and the test simulation system is used to simulate the tobacco drying process.

[0026] In a second aspect, the present application provides a tofu drying machine drum modeling device, comprising:

[0027] A model structure acquisition module is used to disassemble the target tow-bread drying drum to obtain the model structure corresponding to each component in the target tow-bread drying drum and the interface properties corresponding to the interfaces between the components;

[0028] an equation construction module, configured to obtain first characteristic information corresponding to the hot air in the target tobacco drying drum, construct a first target equation corresponding to the hot air based on the first characteristic information, and obtain second characteristic information corresponding to the tobacco in the target tobacco drying drum, and construct a second target equation corresponding to the tobacco based on the second characteristic information;

[0029] a drum wall model acquisition module, configured to construct a drum wall model corresponding to the target cut tobacco drying machine based on the first target equation and the model structure, and to construct a cut tobacco model corresponding to the target cut tobacco drying machine based on the second target equation and the model structure; wherein the drum wall model and the cut tobacco model are constructed using the Modelica language;

[0030] The drum model acquisition module is used to acquire the target drum model corresponding to the target tobacco drying machine drum based on the interface attributes, the drum wall model and the tobacco cut model.

[0031] In a third aspect, the present application provides an electronic device, comprising:

[0032] Memory, used to store computer programs;

[0033] A processor is used to execute the computer program to implement the aforementioned tofu drying machine drum modeling method.

[0034] In a fourth aspect, the present application provides a computer-readable storage medium for storing a computer program, which implements the aforementioned tofu drying machine drum modeling method when executed by a processor.

[0035] In this application, the target wire drying machine drum is first disassembled to obtain the model structure corresponding to each component in the target wire drying machine drum and the interface properties corresponding to the interfaces between the components, and then the first characteristic information corresponding to the hot air in the target wire drying machine drum is obtained, and the first target equation corresponding to the hot air is constructed according to the first characteristic information, and the second characteristic information corresponding to the tobacco in the target wire drying machine drum is obtained, and the second target equation corresponding to the tobacco is constructed according to the second characteristic information, and then the drum wall model corresponding to the target wire drying machine is constructed according to the first target equation and the model structure, and the tobacco model corresponding to the target wire drying machine is constructed according to the second target equation and the model structure; wherein the drum wall model and the tobacco model are models constructed using the Modelica language, and finally, the target drum model corresponding to the target wire drying machine drum is obtained based on the interface properties, the drum wall model and the tobacco model. It can be seen that since the Modelica language is not restricted by causal relationships and has the advantages of high efficiency, flexibility and scalability, this application improves the efficiency of model construction by using the Modelica language for model construction. By using the characteristic information of hot air and tobacco in the tobacco drying machine drum to construct equations and perform modular modeling based on the equations, the correspondence between the constructed model modules and the real physical conditions is guaranteed, thereby ensuring the accuracy of the generated tobacco drying machine drum model. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0037] Figure 1 This is a flow chart of a tofu drying machine drum modeling method disclosed in this application;

[0038] Figure 2 This is a disassembled schematic diagram of the drum structure of a tofu drying machine disclosed in this application;

[0039] Figure 3 This is a schematic diagram of the working stages of a tofu drying drum disclosed in this application;

[0040] Figure 4 This is a schematic diagram of a double-membrane theory of tobacco dehumidification disclosed in this application;

[0041] Figure 5 This is a schematic diagram of the discrete structure of a tofu drying machine drum model disclosed in this application;

[0042] Figure 6 This is a schematic diagram of a drum model of a tofu drying machine disclosed in this application;

[0043] Figure 7 This is a schematic structural diagram of a drum modeling device for a tofu drying machine disclosed in this application;

[0044] Figure 8 This is a structural diagram of an electronic device disclosed in this application. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0046] Currently, the modeling method for tobacco drying drums is usually based on the finite element method or computational fluid dynamics. This method cannot balance the efficiency and accuracy of model construction. Therefore, this application provides a tobacco drying drum modeling method. By using the Modelica language and constructing equations based on the characteristic information of hot air and tobacco in the tobacco drying drum, the modeling efficiency is improved while ensuring model accuracy.

[0047] See also Figure 1 As shown, an embodiment of the present invention discloses a method for modeling a tofu drying drum, comprising:

[0048] Step S11: disassemble the target tow-fiber drying drum to obtain the model structure corresponding to each component in the target tow-fiber drying drum and the interface properties corresponding to the interfaces between the components.

[0049] The drying process of the tobacco drying drum is complex, involving multiple scientific fields such as fluid mechanics, thermodynamics, and heat and mass transfer. The internal heat exchange and flow phenomena are highly coupled, with heat exchange, flow, and heat and mass transfer interfering with each other, resulting in severe nonlinearity in the model equations. Extensive numerical simulations are required to verify the design theory and methods, necessitating the construction of an accurate mathematical model for simulation analysis. The modeling method involved in this embodiment is a drum modeling method based on the Modelica language. This method simulates the complex convective heat and mass transfer, heat exchange, and tobacco dehumidification processes within the drum using relevant theories such as fluid mechanics and heat and mass transfer. A drum model is constructed using the Modelica language in pre-set modeling software, such as Mworks.Sysplorer. This method modularizes the entire drum system, allowing data input through hot air and tobacco input interfaces, and outputting relevant parameters for the hot air and tobacco outlets. The tomato drying drum model obtained using the modeling method in this embodiment has high data accuracy, strong scalability, and is capable of highly refined drum numerical simulation calculations.

[0050] In this embodiment, the silk drying machine drum needs to be disassembled first, and the structure of the disassembled silk drying machine drum is as follows: Figure 2 As shown, after disassembling the wire drying drum, the model structures corresponding to the modules including the drum wall model, the medium model and the tobacco model are obtained, as well as the interface properties within the modules and between the modules. That is, the wire drying drum is decomposed to obtain the corresponding model structure, and the wire drying drum is split from the physical level into the drum wall model entity, the medium model entity and the tobacco model entity, and the interface properties between the wire drying drum and the external interface and the properties of the interface between its components are determined; it should be noted that the wire drying drum and the outside world mainly transmit data in the form of fluid and solid, which is a fluid-solid dual interface; the drum is mainly heat exchanged, and the drum wall has heat exchange with both tobacco and hot air. In addition, the latent heat absorbed by the evaporation of water during the dehumidification process of tobacco must be considered, and connected through the heat interface, that is, the interface types in the wire drying drum mainly include fluid interface, tobacco interface and thermal interface, and the main interface parameters corresponding to each interface are different. The interface types in the wire drying drum are shown in Table 1 below:

[0051] Table 1 Interface Type Table

[0052]

[0053] By disassembling the model, we can obtain the model structure and interface properties of each module of the tow dryer drum. We can then build a model based on the interface properties within the tow dryer drum, thereby improving the accuracy of model construction. Furthermore, by obtaining the model structure of each module, we can build a model in a modular way, thereby improving the applicability of the model corresponding to each module.

[0054] Step S12: obtaining first characteristic information corresponding to the hot air in the target tobacco drying drum, constructing a first target equation corresponding to the hot air based on the first characteristic information, and obtaining second characteristic information corresponding to the tobacco in the target tobacco drying drum, constructing a second target equation corresponding to the tobacco based on the second characteristic information.

[0055] In this embodiment, the tobacco drying drum model is constructed based on the conservation of mass, energy, and momentum. The model is divided into two calculation areas, namely the tobacco area and the hot air area. A complete operation cycle is from the time when the tobacco enters the drying drum entrance to the time when all the tobacco leaves the drying drum. The working stages of the entire drying drum cycle can be divided into the head material stage, the stable operation stage, and the tail material stage. The working stages are as follows: Figure 3 In this embodiment, it is necessary to first obtain the first characteristic information corresponding to the hot air entering the drum of the tofu drying machine, and construct the first target equation based on the first characteristic information corresponding to the hot air. Specifically, the hot air flow rate entering the drum is obtained. , unit is kg / s, hot air flow out of the cylinder , in kg / s, and the water vapor flow rate evaporated from the tobacco by hot air , the unit is kg / s, and the mass conservation equation of the hot wind measurement is constructed based on the above first characteristic information. The mass conservation equation is as follows:

[0056] ;

[0057] At the same time, it is also necessary to obtain the first characteristic information such as the latent heat of evaporation of water vapor absorbed by the hot air, the heat heated by the hot air by the cylinder wall, and the convection heat transfer coefficient between the hot air and the cylinder wall, and use this to construct the energy conservation equation of the hot air measurement. The energy conservation equation of the hot air measurement is as follows:

[0058] ;

[0059] ;

[0060] in, is the latent heat of evaporation of water vapor absorbed by hot air, in J, The heat of hot air heated by the cylinder wall, the unit is J, is the specific heat capacity of air, in J / (kg·K), is the temperature difference between the inlet and outlet of the hot air segment volume, the unit is degK, k is the convective heat transfer correction coefficient, h is the convective heat transfer coefficient between the hot air and the cylinder wall, the unit is , A is the convection heat exchange area between the hot air and the cylinder wall, the unit is , n is the number of segments, is the wall temperature of the i-th volume cylinder, in degK, is the inlet and outlet temperature of the hot air in the i-th volume, in deg K. The above information is the first characteristic information corresponding to the hot air, and the above mass conservation equation is the first target equation.

[0061] Similarly, the second characteristic information corresponding to the tobacco is obtained, and the second target equation corresponding to the tobacco is constructed using the second characteristic information. Specifically, the angular velocity and linear velocity of the tobacco are calculated. The calculation formula is as follows:

[0062] ;

[0063] ;

[0064] Among them, the above is the drum speed, in r / min, is the angular velocity of the tobacco, in rad / s, is the tobacco linear velocity, in m / s, is the roller inclination angle, in rad.

[0065] The calculation formula for the residence time of tobacco in the cylinder is as follows:

[0066] ;

[0067] in, is the residence time of the tobacco unit in the cylinder, in s, and L is the length of the cylinder, in m.

[0068] The conservation formula of tobacco mass in the dry stage is as follows:

[0069] ;

[0070] ;

[0071] The stable working phase is as follows:

[0072] ;

[0073] The dry tail phase looks like this:

[0074] ;

[0075] ;

[0076] in, is the flow rate of tobacco entering the cylinder, in kg / s, is the flow rate of tobacco flowing out of the cylinder, in kg / s, It is the flow rate of tobacco in the cylinder, in kg / s.

[0077] The energy conservation equations for tobacco in the pre-drying stage and post-drying stage (no material at the outlet) are as follows:

[0078] ;

[0079] In the working stage (there is material at the exit) it looks like this:

[0080] ;

[0081] ;

[0082] ;

[0083] The mass and energy conservation equations for the tobacco side at different operating stages are the second target equations. By analyzing the characteristic information of the tobacco and hot air within the drum and constructing the mass and energy conservation equations for the tobacco and hot air at different operating stages based on this characteristic information, we can accurately describe the complex physical states of the tobacco and hot air. By constructing a model based on these equations, we ensure the accuracy of the resulting drum model.

[0084] Step S13: constructing a cylinder wall model corresponding to the target cut tobacco drying machine according to the first target equation and the model structure, and constructing a cut tobacco model corresponding to the target cut tobacco drying machine according to the second target equation and the model structure; wherein the cylinder wall model and the cut tobacco model are models constructed using the Modelica language.

[0085] In this embodiment, the first objective equation corresponding to the hot air, i.e., the mass conservation equation and energy conservation equation corresponding to the hot air side at different working stages, and the second objective equation corresponding to the tobacco, i.e., the mass conservation equation and energy conservation equation corresponding to the tobacco side at different working stages, are used to construct the drum wall model and tobacco model in the tobacco drying drum model, respectively. It should be noted that the above model construction process is completed using the Modelica language, a unified modeling language for multiple physical fields, particularly suitable for complex systems with multi-domain coupling characteristics. Unlike traditional modeling methods, Modelica uses equation modeling, is not restricted by causal relationships, can effectively represent the interactions between various fields in the system, and has the advantages of efficiency, flexibility, and scalability. Therefore, Modelica is very suitable for the multi-domain joint modeling and simulation of the drum tobacco drying system.

[0086] It should be noted that the dehumidification process of tobacco cuts adopts the double membrane theory. Figure 4 As shown, Indicates the gas phase concentration, represents the gas phase interface concentration, Indicates the liquid concentration, represents the liquid interface concentration, Indicates the thickness of the gas phase film, Represents the thickness of the liquid phase film, wherein the time derivative of the moisture content of the tobacco is regarded as the mass transfer flux, which can be expressed as the product of the convective mass transfer coefficient and the mass transfer driving force. According to the double-membrane theory, the mass transfer driving force can be expressed as the difference between the water vapor equilibrium density of the air film and the water vapor equilibrium density of the air film on the tobacco surface. For the drying head and the drying tail stage, since the flow rate of the tobacco in the drum is less than the rated working condition, the dehumidification process is enhanced, and this phenomenon is more obvious at the beginning of the drying head and the end of the drying tail. Therefore, an exponential function relationship is used to fit the gain of the dehumidification process of the drying head and the drying tail process over time; accordingly, the process of constructing the tobacco model corresponding to the target tobacco drying machine can specifically include: obtaining the first water vapor equilibrium density corresponding to the hot air and the second water vapor equilibrium density corresponding to the tobacco; based on the first water vapor equilibrium density and the second water vapor equilibrium density The steam equilibrium density obtains the time derivative calculation equation of the moisture content of the tobacco cut in different working stages of the target tobacco cut dryer drum, and constructs a tobacco cut model corresponding to the target tobacco cut dryer based on each moisture content time derivative calculation equation. The process of obtaining the first water vapor equilibrium density corresponding to the hot air and the second water vapor equilibrium density corresponding to the tobacco cut can specifically include: obtaining the relative humidity corresponding to the hot air based on the temperature of the hot air, and calculating the water vapor equilibrium humidity corresponding to the tobacco cut using the Hendersen correlation equation; obtaining the first water vapor equilibrium density corresponding to the hot air according to the relative humidity and a preset water vapor equilibrium density calculation formula, and obtaining the second water vapor equilibrium density corresponding to the tobacco cut according to the water vapor equilibrium humidity and a preset water vapor equilibrium density calculation formula. Specifically, the above-mentioned moisture content time derivative calculation equation is as follows in the stable working stage:

[0087] ;

[0088] The dry tail stage is as follows:

[0089] ;

[0090] ;

[0091] in, is the water vapor density in the hot air film under equilibrium state, in units of 、 is the water vapor density in the tobacco film at equilibrium state, in units of 、 is the convective mass transfer coefficient, in m / s, is the correlation coefficient, and Am is the driving force for mass transfer.

[0092] The water vapor equilibrium density of the air film is calculated by the relative humidity:

[0093] ;

[0094] in, is the tobacco temperature, in degK.

[0095] For hot air, its relative humidity The interpolation calculation is performed from the hot air temperature using the following interpolation table:

[0096] Table 2 Hot air relative humidity comparison table

[0097] Temperature (degK) Hot air relative humidity (%) 338.15 0.115 358.15 0.050 378.15 0.024 398.15 0.012 418.15 0.007

[0098] For tobacco, the equilibrium humidity of its air film water vapor is calculated using the Hendersen correlation as shown below:

[0099] ;

[0100] in, is the equilibrium humidity of the air film on the surface of tobacco, A and B are the correlation coefficients.

[0101] For tobacco , obtained by interpolation through the physical property parameter table of the corresponding tobacco.

[0102] Table 3 Physical properties of tobacco

[0103] Temperature (degK) Air film equilibrium humidity on tobacco surface (%) 338.15 0.048 358.15 0.035 378.15 0.027 398.15 0.022 418.15 0.018

[0104] By constructing a model based on the mass conservation equations and energy conservation equations for tobacco and hot air in different working stages, the actual physical properties of tobacco and hot air in the tobacco drying drum can be simulated to ensure the accuracy of the generated model; through modular modeling, the tobacco model and the drum wall model are constructed separately, which improves the reusability of the model; and by using the Modelica language for model construction, the efficiency of model construction is improved.

[0105] Step S14: acquiring a target drum model corresponding to the target tobacco drying drum based on the interface attributes, the drum wall model, and the tobacco cut model.

[0106] In this embodiment, the process of obtaining the target drum model corresponding to the target wire drying drum based on the interface properties, the drum wall model and the tobacco model may specifically include: discrete modeling of the target wire drying drum based on the interface properties, the drum wall model and the tobacco model to obtain the target drum model corresponding to the target wire drying drum; it should be noted that, in order to accurately describe the heat exchange effect of the drum wall of the wire drying drum, the wire drying drum model is discretized into multiple heat exchange units for modeling, which can improve the accuracy of the heat exchange effect simulation. Accordingly, the above-mentioned process of discrete modeling of the wire drying drum may specifically include: combining the drum wall model and the tobacco model to obtain the initial model corresponding to the target wire drying drum; discretizing the initial model into a target number of heat exchange units connected end to end to obtain the target drum model corresponding to the target wire drying drum; specifically, as Figure 5 As shown in the discrete modeling diagram, the discrete tomato drying drum model includes a control volume model and a pipe model. The control volume model corresponds to the mass and energy control equations, while the pipe model corresponds to the momentum control equations, and is interleaved with the control volume model. The drum model is discretized into n heat exchange units, connected by a heat conduction model to describe the heat transfer effect of the entire drum wall. A heat exchange unit is a subunit corresponding to the tube wall, tobacco, and hot air. The heat transfer capacity of each unit multiplied by n is the heat transfer capacity of the entire drum.

[0107] In this embodiment, the process of obtaining the target drum model corresponding to the tow-filament drying drum may specifically include: analyzing the fluid medium in the target tow-filament drying drum, constructing the medium model corresponding to the target tow-filament drying drum based on the corresponding analysis results, and obtaining the target drum model corresponding to the target tow-filament drying drum based on the medium model. The target drum model finally obtained is as follows: Figure 6 As shown in the figure, it is understandable that there is also fluid medium such as air in the tobacco drying drum. By analyzing the fluid medium to construct a medium model, and combining the medium model with the tobacco model, drum wall model and other models, a more accurate target tobacco drying drum model can be obtained.

[0108] After acquiring the target drum model, this embodiment further includes connecting the target drum model corresponding to the target tobacco drying drum to pre-set simulation components to construct a corresponding test simulation system, and using the test simulation system to simulate the tobacco drying process. Discrete modeling makes the heat transfer process in the model more precise, thereby ensuring the accuracy of the acquired tobacco drying drum model. Simulation testing using the resulting high-precision tobacco drying drum model ensures the accuracy of the simulation process.

[0109] It can be seen that this application disassembles the model to obtain the model structure and interface properties of each module of the tobacco drying machine drum, and can model according to the interface properties in the tobacco drying machine drum, thereby improving the accuracy of model construction. Moreover, by obtaining the model structure of each module, it can be modeled in a modular way, thereby improving the applicability of the model corresponding to each module; by using the Modelica language to construct the model, the efficiency of model construction is improved; by constructing the model according to the mass conservation equation and energy conservation equation of tobacco and hot air in different working stages, the real physical properties of tobacco and hot air in the tobacco drying machine drum can be simulated for modeling, thereby ensuring the accuracy of the generated model.

[0110] See also Figure 7 As shown, the embodiment of the present application discloses a tofu drying machine drum modeling device, comprising:

[0111] The model structure acquisition module 11 is used to disassemble the target tow-fiber drying drum to obtain the model structure corresponding to each component in the target tow-fiber drying drum and the interface properties corresponding to the interfaces between the components;

[0112] an equation construction module 12, configured to obtain first characteristic information corresponding to the hot air in the target tobacco drying drum, construct a first target equation corresponding to the hot air based on the first characteristic information, and obtain second characteristic information corresponding to the tobacco in the target tobacco drying drum, and construct a second target equation corresponding to the tobacco based on the second characteristic information;

[0113] a drum wall model acquisition module 13, configured to construct a drum wall model corresponding to the target cut tobacco drying machine based on the first target equation and the model structure, and to construct a cut tobacco model corresponding to the target cut tobacco drying machine based on the second target equation and the model structure; wherein the drum wall model and the cut tobacco model are constructed using the Modelica language;

[0114] The drum model acquisition module 14 is configured to acquire a target drum model corresponding to the target tobacco drying machine drum based on the interface attributes, the drum wall model, and the tobacco cut model.

[0115] It can be seen that since the Modelica language is not restricted by causal relationships and has the advantages of high efficiency, flexibility and scalability, this application improves the efficiency of model construction by using the Modelica language for model construction. By using the characteristic information of hot air and tobacco in the tobacco drying machine drum to construct equations and perform modular modeling based on the equations, the correspondence between the constructed model modules and the real physical conditions is guaranteed, thereby ensuring the accuracy of the generated tobacco drying machine drum model.

[0116] In some specific embodiments, the cylinder wall model acquisition module 13 may specifically include:

[0117] The equilibrium density acquisition submodule is used to obtain a first water vapor equilibrium density corresponding to the hot air and a second water vapor equilibrium density corresponding to the cut tobacco;

[0118] A tobacco cut model acquisition unit is used to obtain a time derivative calculation equation for the moisture content of tobacco cut at different working stages of the target tobacco cut dryer drum based on the first water vapor equilibrium density and the second water vapor equilibrium density, and to construct the tobacco cut model corresponding to the target tobacco cut dryer based on each of the time derivative calculation equations for the moisture content.

[0119] In some specific embodiments, the equilibrium density acquisition submodule may specifically include:

[0120] A relative humidity acquisition unit is used to acquire the relative humidity corresponding to the hot air based on the temperature of the hot air, and calculate the water vapor equilibrium humidity corresponding to the tobacco using the Hendersen correlation equation;

[0121] The equilibrium density acquisition unit is used to obtain the first water vapor equilibrium density corresponding to the hot air according to the relative humidity and the preset water vapor equilibrium density calculation formula, and to obtain the second water vapor equilibrium density corresponding to the tobacco according to the water vapor equilibrium humidity and the preset water vapor equilibrium density calculation formula.

[0122] In some specific embodiments, the drum model acquisition module 14 may specifically include:

[0123] The drum model acquisition submodule is used to discretely model the target tobacco drying drum based on the interface attributes, the drum wall model and the tobacco cut model to obtain a target drum model corresponding to the target tobacco drying drum.

[0124] In some specific embodiments, the drum model acquisition submodule may specifically include:

[0125] A model combination unit, configured to combine the drum wall model and the cut tobacco model to obtain an initial model corresponding to the target cut tobacco drying drum;

[0126] The first drum model acquisition unit is used to discretize the initial model into a target number of heat exchange units connected end to end, so as to obtain the target drum model corresponding to the target tofu drying machine drum.

[0127] In some specific embodiments, the drum model acquisition module 14 may specifically include:

[0128] The second drum model acquisition unit is used to analyze the fluid medium in the target tow dryer drum, construct a medium model corresponding to the target tow dryer drum based on the corresponding analysis results, and acquire the target drum model corresponding to the target tow dryer drum based on the medium model.

[0129] In some specific embodiments, the drum model acquisition module 14 further includes:

[0130] The simulation system construction unit is used to connect the target drum model corresponding to the target tobacco drying machine drum with preset simulation components to construct a corresponding test simulation system, and use the test simulation system to simulate the tobacco drying process.

[0131] Furthermore, the embodiment of the present application also discloses an electronic device, Figure 8 This is a structural diagram of an electronic device 20 according to an exemplary embodiment. The content in the diagram should not be considered as any limitation to the scope of application of the present application.

[0132] Figure 8 This is a schematic diagram of the structure of an electronic device 20 provided in an embodiment of the present application. This electronic device 20 may specifically include: at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input / output interface 25, and a communication bus 26. The memory 22 is used to store a computer program, which is loaded and executed by the processor 21 to implement the relevant steps of the tomato drying drum modeling method disclosed in any of the aforementioned embodiments. Furthermore, the electronic device 20 in this embodiment may specifically be an electronic computer.

[0133] In this embodiment, the power supply 23 is used to provide operating voltage for each hardware device on the electronic device 20; the communication interface 24 can create a data transmission channel between the electronic device 20 and the external device. The communication protocol it follows is any communication protocol that can be applied to the technical solution of this application and is not specifically limited here; the input and output interface 25 is used to obtain external input data or output data to the outside world. Its specific interface type can be selected according to specific application needs and is not specifically limited here.

[0134] In addition, the memory 22 as a carrier for resource storage can be a read-only memory, random access memory, disk or optical disk, etc. The resources stored thereon may include an operating system 221, a computer program 222, etc., and the storage method can be temporary storage or permanent storage.

[0135] The operating system 221 is used to manage and control the hardware devices on the electronic device 20 and the computer program 222. The operating system 221 can be Windows Server, NetWare, Unix, Linux, etc. In addition to including a computer program capable of implementing the tomato drying drum modeling method disclosed in any of the aforementioned embodiments and executed by the electronic device 20, the computer program 222 can further include computer programs capable of performing other specific tasks.

[0136] Furthermore, this application discloses a computer-readable storage medium for storing a computer program; when executed by a processor, the computer program implements the aforementioned method for modeling a tofu drying drum. The specific steps of this method can be found in the corresponding content disclosed in the aforementioned embodiments and will not be further elaborated here.

[0137] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. Reference can be made to the descriptions of the identical or similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and the relevant parts can be referred to the descriptions of the methods.

[0138] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0139] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0140] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0141] The above is a detailed introduction to the technical solution provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for modeling a tofu drying drum, characterized in that: include: Disassembling the target tow-fiber drying drum to obtain the model structure corresponding to each component in the target tow-fiber drying drum and the interface properties corresponding to the interfaces between the components; Acquiring first characteristic information corresponding to the hot air in the target tobacco drying drum, constructing a first target equation corresponding to the hot air based on the first characteristic information, and acquiring second characteristic information corresponding to the tobacco in the target tobacco drying drum, constructing a second target equation corresponding to the tobacco based on the second characteristic information; A drum wall model corresponding to the target cut tobacco drying machine is constructed according to the first target equation and the model structure, and a cut tobacco model corresponding to the target cut tobacco drying machine is constructed according to the second target equation and the model structure; wherein the drum wall model and the cut tobacco model are models constructed using the Modelica language; Acquire a target drum model corresponding to the target tobacco drying drum based on the interface attributes, the drum wall model, and the tobacco cut model; The method of constructing the cut tobacco model corresponding to the target cut tobacco dryer includes: obtaining a first water vapor equilibrium density corresponding to the hot air and a second water vapor equilibrium density corresponding to the cut tobacco; obtaining a time derivative calculation equation for the moisture content of the cut tobacco at different working stages of the drum of the target cut tobacco dryer based on the first water vapor equilibrium density and the second water vapor equilibrium density; and constructing the cut tobacco model corresponding to the target cut tobacco dryer based on each of the time derivative calculation equations for the moisture content; The method of obtaining the first water vapor equilibrium density corresponding to the hot air and the second water vapor equilibrium density corresponding to the tobacco includes: obtaining the relative humidity corresponding to the hot air based on the temperature of the hot air, and calculating the water vapor equilibrium humidity corresponding to the tobacco using the Hendersen correlation formula; obtaining the first water vapor equilibrium density corresponding to the hot air according to the relative humidity and a preset water vapor equilibrium density calculation formula, and obtaining the second water vapor equilibrium density corresponding to the tobacco according to the water vapor equilibrium humidity and the preset water vapor equilibrium density calculation formula.

2. The method for modeling a tofu drying drum according to claim 1, characterized in that: The acquiring of a target drum model corresponding to the target tobacco drying drum based on the interface attributes, the drum wall model, and the tobacco cut model includes: The target tobacco drying machine drum is discretely modeled based on the interface properties, the drum wall model, and the tobacco cut model to obtain a target drum model corresponding to the target tobacco drying machine drum.

3. The method for modeling a tofu drying drum according to claim 2, characterized in that: The discrete modeling of the target tow-steel drying machine drum to obtain a target drum model corresponding to the target tow-steel drying machine drum includes: Combining the drum wall model and the tobacco cut model to obtain an initial model corresponding to the target tobacco cutter drum; The initial model is discretized into a target number of heat exchange units connected end to end to obtain the target drum model corresponding to the target tofu drying machine drum.

4. The method for modeling a tofu drying drum according to claim 1, characterized in that: The step of obtaining a target drum model corresponding to the target tofu drying drum includes: The fluid medium in the target tow dryer drum is analyzed, a medium model corresponding to the target tow dryer drum is constructed based on the corresponding analysis results, and the target drum model corresponding to the target tow dryer drum is obtained based on the medium model.

5. The method for modeling a tofu drying drum according to claim 1, characterized in that: After obtaining the target drum model corresponding to the target tofu drying drum, the method further includes: The target drum model corresponding to the target tobacco drying machine drum is connected to a preset simulation component to construct a corresponding test simulation system, and the test simulation system is used to simulate the tobacco drying process.

6. A tofu drying drum modeling device, characterized in that: include: A model structure acquisition module is used to disassemble the target tow-bread drying drum to obtain the model structure corresponding to each component in the target tow-bread drying drum and the interface properties corresponding to the interfaces between the components; an equation construction module, configured to obtain first characteristic information corresponding to the hot air in the target tobacco drying drum, construct a first target equation corresponding to the hot air based on the first characteristic information, and obtain second characteristic information corresponding to the tobacco in the target tobacco drying drum, and construct a second target equation corresponding to the tobacco based on the second characteristic information; a drum wall model acquisition module, configured to construct a drum wall model corresponding to the target cut tobacco drying machine based on the first target equation and the model structure, and to construct a cut tobacco model corresponding to the target cut tobacco drying machine based on the second target equation and the model structure; wherein the drum wall model and the cut tobacco model are constructed using the Modelica language; a drum model acquisition module, configured to acquire a target drum model corresponding to the target tobacco drying drum based on the interface attributes, the drum wall model, and the tobacco cut model; The drum wall model acquisition module includes: a balance density acquisition submodule for acquiring a first water vapor balance density corresponding to the hot air and a second water vapor balance density corresponding to the cut tobacco; a cut tobacco model acquisition unit for acquiring a time derivative calculation equation for the moisture content of the cut tobacco at different working stages of the drum of the target cut tobacco drying machine based on the first water vapor balance density and the second water vapor balance density, and constructing the cut tobacco model corresponding to the target cut tobacco drying machine based on each of the time derivative calculation equations for the moisture content; The equilibrium density acquisition submodule includes: a relative humidity acquisition unit, which is used to obtain the relative humidity corresponding to the hot air based on the temperature of the hot air, and calculate the water vapor equilibrium humidity corresponding to the tobacco using the Hendersen correlation formula; a equilibrium density acquisition unit, which is used to obtain the first water vapor equilibrium density corresponding to the hot air according to the relative humidity and a preset water vapor equilibrium density calculation formula, and obtain the second water vapor equilibrium density corresponding to the tobacco according to the water vapor equilibrium humidity and the preset water vapor equilibrium density calculation formula.

7. An electronic device, characterized in that: include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the tofu drying machine drum modeling method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that Used to store a computer program, which, when executed by a processor, implements the tofu drying machine drum modeling method according to any one of claims 1 to 5.

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