Cut tobacco dryer roller modeling method, device and equipment and storage medium

Abstract

The invention discloses a cut-tobacco dryer roller modeling method, device and equipment and a storage medium, and relates to the technical field of model construction.The method comprises the steps that model structures of all components in a cut-tobacco dryer roller and interface attributes of interfaces between all the components are obtained; constructing a first target equation corresponding to the hot air, and constructing a second target equation corresponding to the tobacco shreds; constructing a cylinder wall model corresponding to the cut tobacco dryer according to the first target equation and the model structure, and constructing a cut tobacco model corresponding to the cut tobacco dryer according to the second target equation and the model structure; wherein the cylinder wall model and the tobacco shred model are models constructed by utilizing a Modelica language; and obtaining a target roller model corresponding to the cut tobacco dryer roller based on the interface attribute, the roller wall model and the cut tobacco model. The Modelica language is utilized to carry out block modeling, so that the modeling efficiency and the model accuracy are ensured.

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 many fields such as metallurgy, building materials, light industry, and municipal administration. As a device for drying a large amount of materials, they have high production efficiency and good adaptability. The drying process of the drum in the tofu drying machine is complex, involving multiple scientific fields such as fluid mechanics, thermodynamics, heat and mass transfer, and the heat exchange and flow phenomena inside it are highly coupled. Heat exchange, flow, heat and mass transfer affect each other, and the model equations are seriously nonlinear. A large amount of numerical simulation work is required to verify the design theory and method. It is necessary to construct an accurate mathematical model for simulation analysis.

[0003] Modelica is a unified modeling language for multiple physical fields, especially suitable for complex systems with multi-domain coupling characteristics. Unlike traditional modeling methods, Modelica uses equation modeling, which is not restricted by causal relationships and can effectively represent the interactions between various fields in the system. It has the advantages of high efficiency, flexibility and scalability. Therefore, Modelica is very suitable for multi-domain joint modeling and simulation of the 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 purpose of the present invention is to provide a tow-dryer drum modeling method, device, equipment and storage medium, which can use Modelica language for modular modeling, and finally synthesize the tow-dryer drum model, thereby ensuring the efficiency and accuracy of the generated tow-dryer drum model. The specific scheme is as follows:

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

[0007] Disassembling the target torrefaction machine drum to obtain the model structure corresponding to each component in the target torrefaction machine drum and the interface properties corresponding to the interfaces between the components;

[0008] Acquire first characteristic information corresponding to the hot air in the target tobacco drying drum, construct a first target equation corresponding to the hot air according to the first characteristic information, and acquire second characteristic information corresponding to the tobacco in the target tobacco drying drum, and construct a second target equation corresponding to the tobacco according to the second characteristic information;

[0009] A drum wall model corresponding to the target tobacco drying machine is constructed according to the first target equation and the model structure, and a tobacco cut model corresponding to the target tobacco drying machine is constructed according to the second target equation and the model structure; wherein the drum wall model and the tobacco cut 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 machine drum based on the interface attribute, the drum wall model and the tobacco cut model includes:

[0012] The target tobacco drying machine drum is discretely modeled 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 machine drum.

[0013] Optionally, the discrete modeling of the target torrefaction machine drum to obtain a target drum model corresponding to the target torrefaction 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, the step of obtaining a target drum model corresponding to the target tofu drying machine drum includes:

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

[0018] Optionally, the step of constructing a tobacco cut model corresponding to the target tobacco cutter 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 tobacco 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 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 machine 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 torrefaction machine drum to obtain the model structure corresponding to each component in the target torrefaction machine drum and the interface properties corresponding to the interfaces between the components;

[0028] an equation construction module, for 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 according to the first characteristic information, and obtaining second characteristic information corresponding to the tobacco in the target tobacco drying drum, and constructing a second target equation corresponding to the tobacco according to the second characteristic information;

[0029] a cylinder wall model acquisition module, used to construct a cylinder wall model corresponding to the target tobacco drying machine according to the first target equation and the model structure, and to construct a tobacco cut model corresponding to the target tobacco drying machine according to the second target equation and the model structure; wherein the cylinder wall model and the tobacco cut model are models 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, including:

[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, when executed by a processor, implements the aforementioned tofu drying machine drum modeling method.

[0035] In the present 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 causality and has the advantages of high efficiency, flexibility and scalability, the present application improves the efficiency of model construction by using the Modelica language for model construction, and constructs equations by utilizing the characteristic information of hot air and tobacco in the tobacco drying machine drum, and performs modular modeling based on the equations, thereby ensuring the correspondence between the constructed model modules and the real physical conditions, 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

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

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

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

[0040] Figure 4 A schematic diagram of a double-membrane theory of tobacco dehumidification disclosed in the present application;

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

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

[0043] Figure 7 This is a schematic diagram of the structure of a tofu drying machine drum modeling device 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] At present, the modeling method of the tobacco drying machine drum is usually to use the finite element method or the computational fluid dynamics method to model the tobacco drying machine drum. This method cannot take into account both the efficiency of model construction and the accuracy of the model. To this end, the present application provides a tobacco drying machine drum modeling method, which uses the Modelica language and the construction equation based on the characteristic information of hot air and tobacco in the tobacco drying machine drum to model, thereby ensuring the accuracy of the model and improving the modeling efficiency.

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

[0048] Step S11, disassembling the target tow-tie drying machine drum to obtain the model structure corresponding to each component in the target tow-tie drying machine drum and the interface properties corresponding to the interfaces between the components.

[0049] The drying process of the drum in the tobacco drying machine is complicated, involving multiple scientific fields such as fluid mechanics, thermodynamics, heat and mass transfer, and the heat exchange and flow phenomena inside it are highly coupled, and heat exchange, flow, heat and mass transfer affect each other, and the model equation is seriously nonlinear. A large amount of numerical simulation work is required to verify the design theory and method, so it is necessary to construct an accurate mathematical model for simulation analysis. The modeling method involved in this embodiment is a drum modeling method based on the Modelica language, which simulates the complex convective heat exchange and convective mass transfer, heat exchange and tobacco dehumidification process in the drum through relevant theories such as fluid mechanics and heat and mass transfer, and builds a drum model in a preset modeling software such as Mworks.Sysplorer based on the Modelica language. The entire drum system is modularized by this method, and data is input through the hot air and tobacco input interface, and the relevant parameters of the hot air and tobacco outlet are output. The data accuracy of the tobacco drying machine drum model obtained by the modeling method in this embodiment is high, and the model has strong scalability, which can realize highly refined drum numerical simulation calculation.

[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 structure corresponding to each module including the drum wall model, the medium model and the tobacco cut model, as well as the interface properties within the module 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 cut model entity, and the interface properties of 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 exchange, and the drum wall has heat exchange with both tobacco cuts and hot air. In addition, the latent heat absorbed by the evaporation of water in the process of tobacco cuts dehumidification must be considered, and connected through the heat interface, that is, the interface types in the wire drying drum mainly include fluid interface, tobacco cut 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, the model structure and interface properties of each module of the wire drying machine drum can be obtained, and modeling can be carried out according to the interface properties in the wire drying machine drum, thereby improving the accuracy of model construction. In addition, by obtaining the model structure of each module, modeling can be carried out in a modular way, thereby improving the applicability of the model corresponding to each module.

[0054] Step S12, obtaining the first characteristic information corresponding to the hot air in the target tobacco drying machine drum, constructing the first target equation corresponding to the hot air according to the first characteristic information, and obtaining the second characteristic information corresponding to the tobacco in the target tobacco drying machine drum, and constructing the second target equation corresponding to the tobacco according to 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 tobacco entering the entrance of the drying drum to the tobacco leaving 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 according to 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 the hot air , the unit is kg / s, and the mass conservation equation of hot air measurement is constructed according to the above first characteristic information, and its 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 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 the hot air, in J, The heat of the 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 segmented volume, the unit is degK, k is the convective heat transfer correction coefficient, and 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, in units of , 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 linear velocity of tobacco, in m / s, is the roller inclination angle, in rad.

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

[0066] ;

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

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

[0069] ;

[0070] ;

[0071] The stable working stage 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 out of the cylinder, in kg / s, It is the tobacco flow rate 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 (exit with material) it looks like this:

[0080] ;

[0081] ;

[0082] ;

[0083] Among them, the mass conservation equation and energy conservation equation corresponding to the above-mentioned tobacco side at different working stages are the above-mentioned second target equation. By analyzing the characteristic information of tobacco and hot air in the drum, and constructing the mass conservation equation and energy conservation equation of tobacco and hot air at different working stages according to the corresponding characteristic information, the complex physical state corresponding to tobacco and hot air can be accurately described. By constructing the model according to the above equations, the accuracy of the obtained drum model is guaranteed.

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

[0085] In this embodiment, it is necessary to use the first target equation corresponding to the hot air, that is, the mass conservation equation and energy conservation equation under different working stages corresponding to the hot air side, and the second target equation corresponding to the tobacco, that is, the mass conservation equation and energy conservation equation under different working stages corresponding to the tobacco side, to respectively construct the drum wall model and the tobacco model in the tobacco drying machine drum model; it should be noted that the above model construction process is completed through the Modelica language, which is a unified modeling language for multiple physical fields, especially suitable for complex systems with multi-field coupling characteristics. Unlike traditional modeling methods, Modelica uses equation modeling, is not restricted by causal relationships, can effectively represent the interaction between various fields in the system, and has the advantages of high efficiency, flexibility and scalability. Therefore, Modelica is very suitable for multi-field joint modeling and simulation of drum tobacco drying machine systems.

[0086] It should be noted that the dehumidification process of tobacco shreds 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 liquid film thickness, 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 air film water vapor equilibrium density and the air film water vapor equilibrium density on the tobacco surface. For the dry head and dry tail stages, 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 dry head and the end of the dry tail. Therefore, an exponential function relationship is used to fit the gain of the dehumidification process of the dry head and dry tail process that changes with 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 in different working stages of the target tobacco drying machine drum, and constructs the tobacco model corresponding to the target tobacco drying machine based on each moisture content time derivative calculation equation; wherein, 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 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 using the Hendersen correlation; obtaining 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 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; 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 air film equilibrium state in tobacco, 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, the unit is degK.

[0095] For hot air, its relative humidity The hot air temperature is interpolated 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, its air film water vapor equilibrium humidity is calculated by the Hendersen correlation as shown below:

[0099] ;

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

[0101] For tobacco , obtained by interpolating 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 of tobacco and hot air in different working stages, the real physical characteristics of tobacco and hot air in the tobacco drying machine drum can be simulated for modeling, thereby ensuring the accuracy of the generated model; through modular modeling, the tobacco model and the drum wall model are constructed separately, thereby improving 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 machine 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 attributes, the drum wall model and the tobacco model may specifically include: discretely modeling the target wire drying drum based on the interface attributes, 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 discretely modeling 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 model discrete modeling diagram, the discrete tobacco drying machine drum model includes a control body model and a takeover model, wherein the control body model corresponds to the mass and energy control equations, and the takeover model corresponds to the momentum control equations, which are interlaced with the control body model. The drum model is discretized into n heat exchange units, which are connected by a heat conduction model to describe the heat exchange effect of the entire drum wall. The heat exchange unit is a sub-unit corresponding to the tube wall-tobacco-hot air. The heat exchange capacity of the unit multiplied by n is the heat exchange capacity of the entire drum.

[0107] In this embodiment, the process of obtaining the target drum model corresponding to the wire drying drum may specifically include: analyzing the fluid medium in the target wire drying drum, constructing the medium model corresponding to the target wire drying drum based on the corresponding analysis result, and obtaining the target drum model corresponding to the target wire drying drum based on the medium model. The target drum model finally obtained is as follows: Figure 6 It is understandable that there are fluid media such as air in the tobacco drying drum. By analyzing the fluid media to construct a medium model, and combining the medium model with tobacco cut model, drum wall model and other models, a more accurate target tobacco drying drum model can be obtained.

[0108] In this embodiment, after the target drum model is obtained, the method further includes: connecting the target drum model corresponding to the target tobacco drying machine drum with the preset simulation component to construct a corresponding test simulation system, and using the test simulation system to simulate the tobacco drying process. By performing discrete modeling, the heat transfer process in the model is made more accurate, thereby ensuring the accuracy of the obtained tobacco drying machine drum model; by using the obtained high-precision tobacco drying machine drum model for simulation testing, the accuracy of the simulation process is ensured.

[0109] It can be seen that the present application obtains the model structure and interface properties of each module of the wire drying machine drum by disassembling the model, and can model according to the interface properties in the wire drying machine drum, thereby improving the accuracy of model construction. Moreover, by obtaining the model structure of each module, modeling can be performed 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 wire 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] A model structure acquisition module 11 is used to disassemble the target torrefaction machine drum to obtain the model structure corresponding to each component in the target torrefaction machine drum and the interface properties corresponding to the interfaces between the components;

[0112] an equation building module 12, for obtaining first characteristic information corresponding to the hot air in the target tobacco drying drum, building a first target equation corresponding to the hot air according to the first characteristic information, and obtaining second characteristic information corresponding to the tobacco in the target tobacco drying drum, building a second target equation corresponding to the tobacco according to the second characteristic information;

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

[0114] The drum model acquisition module 14 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.

[0115] It can be seen that since the Modelica language is not restricted by causality and has the advantages of high efficiency, flexibility and scalability, the present application improves the efficiency of model construction by using the Modelica language for model construction, and constructs equations by utilizing the characteristic information of hot air and tobacco in the tobacco drying machine drum, and performs modular modeling based on the equations, thereby ensuring the correspondence between the constructed model modules and the real physical conditions, 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] A balance density acquisition submodule, used to acquire a first water vapor balance density corresponding to the hot air and a second water vapor balance density corresponding to the shredded 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 cutter 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 cutter based on each of the moisture content time derivative calculation equations.

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

[0120] A relative humidity acquisition unit, 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 machine 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 machine drum.

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

[0125] A model combination unit, used for combining the drum wall model and the tobacco cut model to obtain an initial model corresponding to the target tobacco cutter 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 wire drying machine drum, construct a medium model corresponding to the target wire drying machine drum based on the corresponding analysis results, and acquire the target drum model corresponding to the target wire drying machine 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 a preset simulation component to construct a corresponding test simulation system, and use the test simulation system to simulate the tobacco drying process.

[0131] Furthermore, 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 cannot be regarded as any limitation on the scope of use of the present application.

[0132] Figure 8 The present invention provides a schematic diagram of the structure of an electronic device 20 provided in an embodiment of the present application. The 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 in the tofu drying machine drum modeling method disclosed in any of the aforementioned embodiments. In addition, 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 working 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, and the communication protocol it follows is any communication protocol that can be applied to the technical solution of the present 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, and 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 storing resources may be a read-only memory, a random access memory, a disk or an optical disk, etc. The resources stored thereon may include an operating system 221, a computer program 222, etc., and the storage method may be temporary storage or permanent storage.

[0135] The operating system 221 is used to manage and control the hardware devices and computer program 222 on the electronic device 20, which can be Windows Server, Netware, Unix, Linux, etc. In addition to the computer program that can be used to complete the tofu drying machine drum modeling method performed by the electronic device 20 disclosed in any of the aforementioned embodiments, the computer program 222 can further include computer programs that can be used to complete other specific tasks.

[0136] Furthermore, the present application also discloses a computer-readable storage medium for storing a computer program; wherein, when the computer program is executed by a processor, the aforementioned disclosed method for modeling a tofu drying machine drum is implemented. The specific steps of the method can be referred to the corresponding contents disclosed in the aforementioned embodiments, and will not be repeated here.

[0137] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[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 composition and steps of each example have been generally described in the above description according to function. 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 to be beyond the scope of this application.

[0139] The steps of the method or algorithm 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 a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, 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 article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0141] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article 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 general technicians in this field, according to the idea of ​​the present application, there will 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 machine drum, characterized in that: include: Disassembling the target torrefaction machine drum to obtain the model structure corresponding to each component in the target torrefaction machine drum and the interface properties corresponding to the interfaces between the components; Acquire first characteristic information corresponding to the hot air in the target tobacco drying drum, construct a first target equation corresponding to the hot air according to the first characteristic information, and acquire second characteristic information corresponding to the tobacco in the target tobacco drying drum, and construct a second target equation corresponding to the tobacco according to the second characteristic information; A drum wall model corresponding to the target tobacco drying machine is constructed according to the first target equation and the model structure, and a tobacco cut model corresponding to the target tobacco drying machine is constructed according to the second target equation and the model structure; wherein the drum wall model and the tobacco cut model are models constructed using the Modelica language; 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.

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

3. The method for modeling a tofu drying machine drum according to claim 2, characterized in that: The discrete modeling of the target torrefaction machine drum to obtain a target drum model corresponding to the target torrefaction 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 machine drum according to claim 1, characterized in that: The step of obtaining a target drum model corresponding to the target tofu drying machine drum includes: The fluid medium in the target wire drying machine drum is analyzed, a medium model corresponding to the target wire drying machine drum is constructed based on the corresponding analysis results, and the target drum model corresponding to the target wire drying machine drum is obtained based on the medium model.

5. The method for modeling a tofu drying machine drum according to any one of claims 1 to 4, characterized in that: The step of constructing a tobacco cut model corresponding to the target tobacco cut drying machine includes: Obtaining a first water vapor equilibrium density corresponding to the hot air and a second water vapor equilibrium density corresponding to the shredded tobacco; Based on the first water vapor equilibrium density and the second water vapor equilibrium density, the time derivative calculation equation of the moisture content of the tobacco in different working stages of the target tobacco drying machine drum is obtained, and the tobacco model corresponding to the target tobacco drying machine is constructed based on each of the moisture content time derivative calculation equations.

6. The method for modeling a tofu drying machine drum according to claim 5, characterized in that: The obtaining of a first water vapor equilibrium density corresponding to the hot air and a second water vapor equilibrium density corresponding to the shredded tobacco comprises: 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; 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.

7. The method for modeling a tofu drying machine drum according to claim 1, characterized in that: After obtaining the target drum model corresponding to the target tofu drying machine 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.

8. A tofu drying machine drum modeling device, characterized in that: include: A model structure acquisition module is used to disassemble the target torrefaction machine drum to obtain the model structure corresponding to each component in the target torrefaction machine drum and the interface properties corresponding to the interfaces between the components; an equation construction module, for 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 according to the first characteristic information, and obtaining second characteristic information corresponding to the tobacco in the target tobacco drying drum, and constructing a second target equation corresponding to the tobacco according to the second characteristic information; a cylinder wall model acquisition module, used to construct a cylinder wall model corresponding to the target tobacco drying machine according to the first target equation and the model structure, and to construct a tobacco cut model corresponding to the target tobacco drying machine according to the second target equation and the model structure; wherein the cylinder wall model and the tobacco cut model are models constructed using the Modelica language; 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.

9. An electronic device, characterized in that: include: Memory, used to store computer programs; A processor, used for executing the computer program to implement the tofu drying machine drum modeling method as described in any one of claims 1 to 7.

10. 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 as described in any one of claims 1 to 7.

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