Method and device for generating mathematical model of water heater

Abstract

The present application relates to a method and a device for generating a mathematical model of a water heater. Among them, the method includes: performing a sound transmission loss simulation calculation on a first mathematical model of a water heater with an air intake pipe to obtain a sound transmission loss value; determining whether the sound transmission loss value and a target sound transmission loss value meet a preset modeling requirement; if they meet the preset modeling requirement, generating a second mathematical model of the water heater based on the first mathematical model according to a preset modeling rule; performing a fluid resistance simulation calculation on the second mathematical model of the water heater to obtain a fluid resistance value; determining whether the fluid resistance value and a target fluid resistance value meet a preset output requirement; if they meet the preset output requirement, outputting the second mathematical model of the water heater so that production personnel can produce a water heater with an air intake channel according to the second mathematical model of the water heater. Through the embodiments of the present application, a mathematical model of a water heater that meets the requirements of noise reduction and fluid resistance can be obtained.

Description

Technical Field

[0001] The present application relates to the technical field of generating a mathematical model of a water heater, and particularly to a method and a device for generating a mathematical model of a water heater. Background Art

[0002] With the improvement of the social living standard and the scientific and technological level, consumers have higher and higher requirements for the comfort of gas water heaters. In particular, gas water heaters with low noise are more and more favored by consumers. The lower the noise of the gas water heater, the stronger the market competitiveness.

[0003] Currently, the optimization of the noise of gas water heaters focuses on reducing the noise of the combustion burner and the fan. The corresponding optimization measures mainly include burner optimization, flame uniformity optimization, fan optimization, and adding sound-absorbing materials, etc. However, the exploration of the noise propagation path and the reduction of noise during propagation is relatively lacking. Therefore, it is necessary to conduct targeted exploration to achieve noise reduction of gas water heaters. Summary of the Invention

[0004] Aiming at the shortcomings of the existing methods, the present application provides a method and a device for generating a mathematical model of a water heater to solve the technical problem that the existing technology lacks relatively in the exploration of the noise propagation path and the reduction of noise during propagation.

[0005] In a first aspect, an embodiment of the present application provides a method for generating a mathematical model of a water heater, including: performing a sound transmission loss simulation calculation on a first mathematical model of a water heater with an air intake pipe to obtain a sound transmission loss value; determining whether the sound transmission loss value meets a preset modeling requirement; the target sound transmission loss value is obtained by performing a sound transmission loss experiment on a physical water heater made according to the first mathematical model; if it meets the preset modeling requirement, then based on the first mathematical model, according to a preset modeling rule, generate a second mathematical model of the water heater; performing a fluid resistance simulation calculation on the second mathematical model of the water heater to obtain a fluid resistance value; determining whether the fluid resistance value meets a preset output requirement; the target fluid resistance value is obtained by performing a fluid resistance calculation on a third mathematical model of a water heater without an air intake pipe; if it meets the preset output requirement, then output the second mathematical model of the water heater so that production personnel can produce a water heater with an air intake channel according to the second mathematical model of the water heater.

[0006] As an alternative implementation, the method further includes: geometrically reconstructing the preset water heater structure data to obtain the data after geometric reconstruction processing; the preset water heater structure data at least includes the size parameters of the air intake pipe, the water heater housing, the combustion chamber, and the air duct housing, as well as the spacing parameters between any two of them; performing mesh division on the data after geometric reconstruction processing to obtain the first mathematical model of the water heater.

[0007] As an alternative implementation, performing a sound transmission loss simulation calculation on the first mathematical model of the water heater with an air intake pipe to obtain a sound transmission loss value, including: determining a first noise value at the virtual position of the preset noise source and a second noise value at the preset virtual detection position according to the first mathematical model of the water heater, and the virtual position, frequency, and amplitude of the preset noise source; the virtual position of the preset noise source is inside the first mathematical model of the water heater, and the preset virtual detection position is outside the first mathematical model of the water heater; taking the difference between the first noise value and the second noise value as the sound transmission loss value.

[0008] As an alternative implementation, the compliance with the preset modeling requirements includes: the ratio of the absolute value of the difference between the sound transmission loss value and the target sound transmission loss value to the target sound transmission loss value is less than or equal to 20%.

[0009] As an alternative implementation, the compliance with the preset output requirements includes: the ratio of the absolute value of the difference between the fluid resistance value and the target fluid resistance value to the target sound transmission loss value is less than or equal to 30%.

[0010] As an alternative implementation, generating the second mathematical model of the water heater based on the first mathematical model according to the preset modeling rules includes: generating the second mathematical model of the water heater according to the finite element modeling method based on the structure data of the first mathematical model of the water heater; the structure data of the first mathematical model of the water heater at least includes the size parameters of the air intake pipe, the water heater housing, the combustion chamber, and the air duct housing, as well as the spacing parameters between any two of them.

[0011] As an alternative implementation, the generation method further includes: if it does not meet the preset modeling requirements, then at least one of modifying the mesh quality, changing the frequency and amplitude of the preset noise source, changing the preset virtual detection position, deleting the components other than the air intake pipe, the water heater housing, the combustion chamber, and the air duct housing, adding the components other than the air intake pipe, the water heater housing, the combustion chamber, and the air duct housing, and increasing the number of sound sources is used to correct the first mathematical model of the water heater.

[0012] Second aspect, the embodiment of the present application provides a device for generating a mathematical model of a water heater, including: a first simulation calculation module, configured to perform a sound transmission loss simulation calculation on a first mathematical model of a water heater with an air intake pipe to obtain a sound transmission loss value; a first judgment module, configured to judge whether the sound transmission loss value meets a preset modeling requirement; the target sound transmission loss value is obtained by performing a sound transmission loss experiment on a physical water heater manufactured according to the first mathematical model; a second mathematical model generation module, configured to, if the preset modeling requirement is met, generate a second mathematical model of the water heater based on the first mathematical model according to a preset modeling rule; a second simulation calculation module, configured to perform a fluid resistance simulation calculation on the second mathematical model of the water heater to obtain a fluid resistance value; a second judgment module, configured to judge whether the fluid resistance value meets a preset output requirement; the target fluid resistance value is obtained by performing a fluid resistance calculation on a third mathematical model of a water heater without an air intake pipe; an output module, configured to, if the preset output requirement is met, output the second mathematical model of the water heater, so that production personnel can produce a water heater with an air intake channel according to the second mathematical model of the water heater.

[0013] As an optional implementation manner, the generating device further includes: a geometric reconstruction module, configured to perform geometric reconstruction on preset water heater structure data to obtain geometrically reconstructed data; the preset water heater structure data at least includes the structure parameters of an air intake pipe, a water heater shell, a combustion chamber, and a duct shell; a mesh division module, configured to perform mesh division on the geometrically reconstructed data to obtain the first mathematical model of the water heater.

[0014] As an optional implementation manner, the first simulation calculation module is specifically configured to: according to the first mathematical model of the water heater, and the virtual position, frequency, and amplitude of a preset noise source, determine a first noise value at the virtual position of the preset noise source and a second noise value at a preset virtual detection position; the virtual position of the preset noise source is inside the first mathematical model of the water heater, and the preset virtual detection position is outside the first mathematical model of the water heater; use the difference between the first noise value and the second noise value as the sound transmission loss value.

[0015] The present application provides a method and a device for generating a mathematical model of a water heater. The technical solution provided by the embodiment of the present application at least brings the following beneficial effects:

[0016] Perform acoustic transmission loss simulation calculations on the first mathematical model of a water heater with an air intake duct to determine whether the obtained acoustic transmission loss value meets the noise reduction requirements. If it meets the noise reduction requirements, then perform fluid resistance simulation calculations on the water heater mathematical model that meets the noise reduction requirements to determine whether the obtained fluid resistance value meets the fluid resistance requirements. If it meets the fluid resistance requirements, then a water heater mathematical model that meets the noise reduction and fluid resistance requirements, as well as a water heater with an air intake duct, can be obtained for actual production.

[0017] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic flowchart of a method for generating a water heater mathematical model provided by an embodiment of this application;

[0020] Figure 2 It is a schematic flowchart of a method for generating a water heater mathematical model provided by another embodiment of this application;

[0021] Figure 3 It is a schematic framework diagram of the structure of a device for generating a water heater mathematical model provided by an embodiment of this application.

[0022] Reference Numerals and Corresponding Descriptions:

[0023] 10: First simulation calculation module;

[0024] 20: First judgment module;

[0025] 30: Second mathematical model generation module;

[0026] 40: Second simulation calculation module;

[0027] 50: Second judgment module;

[0028] 60: Output module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to make the objectives, technical solutions, and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] The inventors of the present application have conducted research and found that the noise of a household gas water heater is a sound effect formed by a combination of sounds with different frequencies, different intensities, regular sounds, and irregular sounds. The noise frequency band of the gas water heater is relatively wide, and there are obvious peak components in the low-frequency range. Currently, the optimization measures and research on the noise of gas water heaters have ignored that the gas water heater is a semi-closed circulation space structure. The noise of the gas water heater will be transmitted between the shell, internal components, air intake, and air outlet of the gas water heater through reflection, diffraction, and scattering. By analyzing the noise propagation path and reducing certain frequency sounds during its propagation, a better noise reduction effect may be achieved. The existing gas water heaters do not limit the structure of the air intake pipe. Air enters the interior of the gas water heater from the air intake of the gas water heater, circulates through the gap between the flow components and the outer shell of the gas water heater, and then enters the combustion chamber. That is, there is no air intake pipe provided between the air intake and the combustion chamber; if an air intake pipe is provided to guide air into the combustion chamber, then the air intake pipe is also part of the noise propagation path. The inventors of the present application have explored and studied whether different structures of air intake pipes will have different noise reduction effects.

[0031] The method and device for generating a water heater mathematical model provided by the present application aim to solve the above technical problems of the prior art.

[0032] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments.

[0033] As Figure 1 shown, the embodiment of the present application provides a method for generating a water heater mathematical model, which mainly includes steps S1 - S6:

[0034] Step S1: Perform a sound transmission loss simulation calculation on the first mathematical model of a water heater with an air intake pipe to obtain a sound transmission loss value.

[0035] As an optional implementation manner, the performing a sound transmission loss simulation calculation on the first mathematical model of a water heater with an air intake pipe in step S1 to obtain a sound transmission loss value includes:

[0036] According to the first mathematical model of the water heater, as well as the virtual position, frequency, and amplitude of the preset noise source, determine the first noise value at the virtual position of the preset noise source and the second noise value at the preset virtual detection position; the virtual position of the preset noise source is inside the first mathematical model of the water heater, and the preset virtual detection position is outside the first mathematical model of the water heater; and use the difference between the first noise value and the second noise value as the sound transmission loss value.

[0037] The embodiments of this application are for simulating and modeling gas water heaters, and known simulation software and known modeling methods can be used for modeling. After the first mathematical model of the water heater is modeled, the preset virtual position information, frequency, and amplitude of the noise source can be input into the simulation software to simulate the noise source in the physical water heater; the preset virtual position of the noise source can correspond to the center position of the burner in the physical water heater. The center of the burner is the position with the largest and most representative noise in the noise source position. The noise source can simulate a dipole sound source, and the propagation direction of the sound emitted by the noise source can be simulated as perpendicular to the fire outlet direction of the burner to achieve sound propagation. The preset frequency and preset amplitude of the noise source can be determined by experiments in advance; in addition, a fully reflective wall can be set 20 millimeters behind the gas water heater to simulate the kitchen wall. The sound transmission loss value can be calculated using the sound transmission simulation analysis tool (functional module) of the simulation software.

[0038] Sound transmission loss is an important characteristic parameter of the acoustic performance of a muffler. Usually, the higher the transmission loss value in a certain frequency band, the stronger the sound attenuation performance of this muffler in this frequency band. By analyzing the sound propagation characteristics of the gas water heater, the sound transmission loss value is defined as the difference between the first noise value and the second noise value. Through simulation calculation and verification of air intake pipes (sound channels) with different designs, the greater the sound transmission loss value, the better the sound attenuation effect.

[0039] After all the parameters are set, use the sound transmission loss simulation analysis function in the software or inserted into the software, and perform simulation according to the GB6932-2015 Gas Water Heater Noise Test Method; the preset virtual detection position is outside the first mathematical model of the water heater. Correspondingly, when performing the sound transmission loss detection points of the physical water heater, the detection points can be set at three points: left, middle, and right, 1 m away from the physical gas water heater.

[0040] Step S2: Determine whether the sound transmission loss value meets the preset modeling requirements compared with the target sound transmission loss value.

[0041] The target sound transmission loss value is obtained by conducting a sound transmission loss experiment on a physical water heater manufactured according to the first mathematical model. To verify the effectiveness of the sound transmission loss simulation calculation results, a physical water heater is manufactured using the structural parameters of the first mathematical model of the water heater and a sound transmission loss test is conducted to obtain the target sound transmission loss value, which is then compared with the sound transmission loss value. Based on the comparison results, it is determined whether the preset modeling requirements are met.

[0042] In a possible embodiment, a gas water heater with a capacity of 16 liters and a rated load of 30 kW is used as the experimental object. The sound source setting, the environmental setting of the sound transmission loss, and the detection position of the sound transmission loss are all the same as the simulation calculation environment setting of the simulation software.

[0043] Step S3: If the preset modeling requirements are met, then based on the first mathematical model and according to the preset modeling rules, a second mathematical model of the water heater is generated.

[0044] If the verification is passed, it proves that the structure of the water heater of the first mathematical model meets the noise reduction requirements. Since the water heater includes an air intake pipe, in order to ensure that the air flow can smoothly enter and exit the combustion chamber of the water heater and meet the air volume required for gas combustion, the flow resistance of the air intake pipe cannot be too large. Therefore, it is necessary to analyze the fluid flow resistance loss of the air intake pipe. To perform a fluid resistance simulation calculation on the simulation model of the water heater, it is necessary to make an adaptive adjustment to the simulation model of the water heater to obtain an accurate fluid resistance value.

[0045] Step S4: Perform a fluid resistance simulation calculation on the second mathematical model of the water heater to obtain a fluid resistance value.

[0046] After generating the second mathematical model of the water heater, the parameters involved in the fluid resistance simulation calculation (such as fluid density, fluid velocity, viscous resistance coefficient, and cross-sectional area of the air pipe, etc.) are input into the simulation software, and the fluid resistance simulation calculation is performed using the fluid mechanics simulation analysis tool (function module) in the simulation software to obtain a fluid resistance value.

[0047] Step S5: Determine whether the fluid resistance value meets the preset output requirements compared with the target fluid resistance value.

[0048] The target fluid resistance value is obtained by performing a fluid resistance calculation on the third mathematical model of the water heater without an air intake pipe. To verify the effectiveness of the fluid resistance simulation calculation results, the target fluid resistance value obtained by performing a fluid resistance calculation using the third mathematical model of the water heater is compared with the fluid resistance value. Based on the comparison results, it is determined whether the preset output requirements are met.

[0049] Step S6: If the preset output requirements are met, output the second mathematical model of the water heater so that production personnel can produce a water heater with an air intake channel according to the second mathematical model of the water heater.

[0050] If the verification passes, it proves that the water heater structure of the second mathematical model meets the requirements of both noise reduction and fluid resistance.

[0051] The method for generating the mathematical model of the water heater provided by the embodiment of the present application performs acoustic transmission loss simulation calculation on the first mathematical model of the water heater with an air intake pipe, determines whether the obtained acoustic transmission loss value meets the noise reduction requirements. If the noise reduction requirements are met, then perform fluid resistance simulation calculation on the water heater mathematical model that meets the noise reduction requirements, determine whether the obtained fluid resistance value meets the fluid resistance requirements. If the fluid resistance requirements are met, then a water heater mathematical model that meets the requirements of both noise reduction and fluid resistance, and a water heater mathematical model with an air intake pipe can be obtained for actual production.

[0052] The embodiment of the present application performs simulation modeling for a gas water heater, and can use known simulation software and known modeling methods for modeling.

[0053] As an optional implementation manner, the method for generating the mathematical model of the water heater further includes:

[0054] Perform geometric reconstruction on the preset water heater structure data to obtain the data after geometric reconstruction processing; the preset water heater structure data at least includes the size parameters of the air intake pipe, the water heater shell, the combustion chamber, and the air duct shell, as well as the spacing parameters between any two of them; perform mesh division on the data after geometric reconstruction processing to obtain the first mathematical model of the water heater.

[0055] The size parameters (for example, parameters such as length, width, height, thickness, and radian) of at least the air intake pipe, the water heater shell, the combustion chamber, and the air duct shell, as well as the spacing parameters between any two of the foregoing (air intake pipe, water heater shell, combustion chamber, and air duct shell) can be input into the simulation software for geometric reconstruction, and the acoustic boundary element method is used for mesh division to complete the first mathematical model of the water heater. Among them, the mesh can adopt a triangular shell element mesh, and the mesh quality coefficient should be guaranteed to be greater than or equal to 0.3.

[0056] As an optional implementation manner, the meeting the preset modeling requirements in the foregoing step S3 includes:

[0057] The ratio of the absolute value of the difference between the acoustic transmission loss value and the target acoustic transmission loss value to the target acoustic transmission loss value is less than or equal to 20%.

[0058] As an optional implementation manner, the meeting the preset output requirements in the foregoing step S6 includes:

[0059] The ratio of the absolute value of the difference between the fluid resistance value and the target fluid resistance value to the target sound transmission loss value is less than or equal to 30%.

[0060] As an alternative implementation, generating the second mathematical model of the water heater based on the first mathematical model in the foregoing step S3 according to the preset modeling rules includes:

[0061] Generating the second mathematical model of the water heater according to the finite element modeling method based on the structural data of the first mathematical model of the water heater; the structural data of the first mathematical model of the water heater includes at least the size parameters of the air intake pipe, the water heater housing, the combustion chamber, and the air duct housing, and the spacing parameters between any two of them.

[0062] The size parameters of the air intake pipe, the water heater housing, the combustion chamber, and the air duct housing may include parameters such as length, width, height, thickness, and radian. Any two of the foregoing refer to any two of the air intake pipe, the water heater housing, the combustion chamber, and the air duct housing.

[0063] As Figure 2 shown, as an alternative implementation, the method for generating the water heater mathematical model further includes step S7:

[0064] If the preset modeling requirements are not met, then at least one of the following is used to correct the first mathematical model of the water heater: modifying the mesh quality, changing the frequency and amplitude of the preset noise source, changing the preset virtual detection position, deleting the components other than the air intake pipe, the water heater housing, the combustion chamber, and the air duct housing, adding the components other than the air intake pipe, the water heater housing, the combustion chamber, and the air duct housing, and increasing the number of sound sources.

[0065] In some possible embodiments, the method for correcting the first mathematical model of the water heater includes at least one of the following:

[0066] Increasing or decreasing the mesh quality;

[0067] Increasing or decreasing the frequency and amplitude of the Yisuhu River noise source;

[0068] Horizontally moving the preset virtual detection position;

[0069] Deleting components such as the water tank coil, solenoid valve, power supply box, fan motor, and water storage tank body;

[0070] Adding components such as the water tank coil, solenoid valve, power supply box, fan motor, and water storage tank body;

[0071] Set sound sources equal in number to the number of burner ports, and correspond to the burner ports respectively. For example, if the burner is composed of 6 parallel burner ports, 6 independent sound sources can be set for sound transmission loss detection.

[0072] As an optional implementation manner, the method for generating the water heater mathematical model further includes:

[0073] If the preset output requirements are not met, it is determined that the second mathematical model of the water heater is unavailable.

[0074] If the preset output requirements are not met, it indicates that the flow resistance is too large, which will prevent more air from entering the combustion chamber and cannot meet the air volume required for gas combustion. The second mathematical model of the water heater is not suitable for use. After determining that the second mathematical model is unavailable, the air intake channel in the original first mathematical model can be replaced with an air intake channel of another structure (or different size parameters) (assuming that the air intake channel structure in the original first mathematical model is a straight channel, and the air intake channel of another structure can be a "U"-shaped channel) to form a new first mathematical model, and the steps of sound transmission loss simulation calculation are repeated. If multiple air intake channels with different structures all pass the verification, it is possible to decide which one or more air intake channels are suitable for application to the gas water heater according to the sound transmission loss value, the fluid resistance value, and personal experience.

[0075] It should be understood that although Figures 1 to 2 the steps in the flowchart of Figures 1 to 2 are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover,

[0076] at least a part of the steps in

[0077] can include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same moment, but can be executed at different moments. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of the steps or stages in other steps or other steps. Figure 3As shown in the figure, based on the same inventive concept, an embodiment of the present application provides a device for generating a mathematical model of a water heater, mainly including a first simulation calculation module 10, a first judgment module 20, a second mathematical model generation module 30, a second simulation calculation module 40, a second judgment module 50, and an output module 60. The first simulation calculation module 10 is used to perform a sound transmission loss simulation calculation on the first mathematical model of the water heater with an air intake pipe to obtain a sound transmission loss value; the first judgment module 20 is used to judge whether the sound transmission loss value meets the preset modeling requirements compared with the target sound transmission loss value; the target sound transmission loss value is obtained by performing a sound transmission loss experiment on the physical water heater made according to the first mathematical model; the second mathematical model generation module 30 is used to generate the second mathematical model of the water heater based on the first mathematical model according to the preset modeling rules if the preset modeling requirements are met; the second simulation calculation module 40 is used to perform a fluid resistance simulation calculation on the second mathematical model of the water heater to obtain a fluid resistance value; the second judgment module 50 is used to judge whether the fluid resistance value meets the preset output requirements compared with the target fluid resistance value; the target fluid resistance value is obtained by performing a fluid resistance calculation on the third mathematical model of the water heater without an air intake pipe; the output module 60 is used to output the second mathematical model of the water heater if the preset output requirements are met, so that production personnel can produce a water heater with an air intake channel according to the second mathematical model of the water heater.

[0078] As an optional implementation manner, the device for generating a mathematical model of a water heater further includes a geometric reconstruction module and a mesh generation module. The geometric reconstruction module is used to perform geometric reconstruction on the preset water heater structure data to obtain the data after geometric reconstruction processing; the preset water heater structure data at least includes the size parameters of the air intake pipe, the water heater shell, the combustion chamber, and the duct shell, as well as the spacing parameters between any two of them; the mesh generation module is used to perform mesh generation on the data after geometric reconstruction processing to obtain the first mathematical model of the water heater.

[0079] As an optional implementation manner, the first simulation calculation module is specifically used for:

[0080] According to the first mathematical model of the water heater, as well as the virtual position, frequency, and amplitude of the preset noise source, determine the first noise value at the virtual position of the preset noise source and the second noise value at the preset virtual detection position; the virtual position of the preset noise source is located inside the first mathematical model of the water heater, and the preset virtual detection position is located outside the first mathematical model of the water heater;

[0081] Take the difference between the first noise value and the second noise value as the sound transmission loss value.

[0082] The embodiment of the present application provides a device for generating a mathematical model of a water heater, which performs acoustic transmission loss simulation calculation on the first mathematical model of a water heater with an air intake pipe, determines whether the obtained acoustic transmission loss value meets the noise reduction requirement. If it meets the noise reduction requirement, then performs fluid resistance simulation calculation on the water heater mathematical model that meets the noise reduction requirement, determines whether the obtained fluid resistance value meets the requirement of fluid resistance. If it meets the requirement of fluid resistance, then a water heater mathematical model that meets the requirements of noise reduction and fluid resistance, and a water heater mathematical model with an air intake pipe can be obtained for actual production.

[0083] As an optional implementation manner, the second mathematical model generation module 30 is specifically configured to: the ratio of the absolute value of the difference between the acoustic transmission loss value and the target acoustic transmission loss value to the target acoustic transmission loss value is less than or equal to 20%.

[0084] As an optional implementation manner, the output module 60 is specifically configured to: the ratio of the absolute value of the difference between the fluid resistance value and the target fluid resistance value to the target acoustic transmission loss value is less than or equal to 30%.

[0085] As an optional implementation manner, the second mathematical model generation module 30 is further specifically configured to: generate a model according to the finite element modeling method based on the structural data of the first mathematical model of the water heater.

[0086] As an optional implementation manner, the generating device further includes a correction module, which is used to correct the first mathematical model of the water heater if it does not meet the preset modeling requirements.

[0087] For the specific limitations on the device for generating a mathematical model of a water heater, reference can be made to the limitations on the method for generating a mathematical model of a water heater in the above text, which will not be elaborated here. Each module in the above device for generating a mathematical model of a water heater can be implemented in whole or in part through software, hardware, and their combination. The above modules can be embedded in the processor of the computer device in the form of hardware or be independent of it, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above respective modules.

[0088] It should be noted that, in this document, relational terms such as first and second are only used 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 "comprising", "including" or any other variant 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 expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0089] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other, and each embodiment focuses on the differences from other embodiments. In particular, for system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and reference can be made to the corresponding parts of the method embodiments for the relevant content.

[0090] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0091] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A method for generating a mathematical model of a water heater, characterized in that, it includes: Performing acoustic transmission loss simulation calculation on the first mathematical model of a water heater with an air intake pipe to obtain an acoustic transmission loss value; Judging whether the acoustic transmission loss value conforms to a preset modeling requirement with respect to a target acoustic transmission loss value; the target acoustic transmission loss value is obtained by performing an acoustic transmission loss experimental test on a physical water heater manufactured according to the first mathematical model; If it conforms to the preset modeling requirement, then based on the first mathematical model, according to a preset modeling rule, generating the second mathematical model of the water heater; Performing fluid resistance simulation calculation on the second mathematical model of the water heater to obtain a fluid resistance value; Judging whether the fluid resistance value conforms to a preset output requirement with respect to a target fluid resistance value; The target fluid resistance value is obtained by performing a fluid resistance calculation on a third mathematical model of a water heater without an air intake pipe; If it conforms to the preset output requirement, then outputting the second mathematical model of the water heater so that production personnel can produce a water heater with an air intake channel according to the second mathematical model of the water heater.

2. The generation method according to claim 1, characterized in that, the method further includes: Performing geometric reconstruction on preset water heater structure data to obtain data after geometric reconstruction processing; the preset water heater structure data at least includes the size parameters of an air intake pipe, a water heater shell, a combustion chamber, and a duct shell, as well as the spacing parameters between any two of them; Performing mesh division on the data after geometric reconstruction processing to obtain the first mathematical model of the water heater.

3. The generation method according to claim 1, characterized in that, Performing acoustic transmission loss simulation calculation on the first mathematical model of a water heater with an air intake pipe to obtain an acoustic transmission loss value, including: According to the first mathematical model of the water heater, as well as the virtual position, frequency, and amplitude of a preset noise source, determining a first noise value at the virtual position of the preset noise source and a second noise value at a preset virtual detection position; the virtual position of the preset noise source is inside the first mathematical model of the water heater, and the preset virtual detection position is outside the first mathematical model of the water heater; Taking the difference between the first noise value and the second noise value as the acoustic transmission loss value.

4. The generation method according to claim 1, characterized in that, the conformity with the preset modeling requirement includes: The ratio of the absolute value of the difference between the acoustic transmission loss value and the target acoustic transmission loss value to the target acoustic transmission loss value is less than or equal to 20%.

5. The generation method according to claim 1, characterized in that, the conformity with the preset output requirement includes: The ratio of the absolute value of the difference between the fluid resistance value and the target fluid resistance value to the target acoustic transmission loss value is less than or equal to 30%.

6. The generation method according to claim 1, characterized in that, the generating the second mathematical model of the water heater based on the first mathematical model according to a preset modeling rule includes: Based on the structural data of the first mathematical model of the water heater, a second mathematical model of the water heater is generated according to the finite element modeling method; the structural data of the first mathematical model of the water heater includes at least the size parameters of the air intake pipe, the water heater shell, the combustion chamber and the air duct shell, and the spacing parameters between any two of them.

7. The generation method according to claim 3, wherein, further comprising: If the preset modeling requirements are not met, at least one of modifying the mesh quality, changing the frequency and amplitude of the preset noise source, changing the preset virtual detection position, deleting the components other than the air intake pipe, the water heater shell, the combustion chamber and the air duct shell, adding the components other than the air intake pipe, the water heater shell, the combustion chamber and the air duct shell, and increasing the number of sound sources is used to correct the first mathematical model of the water heater.

8. A device for generating a mathematical model of a water heater, wherein, comprising: A first simulation calculation module (10) for performing a sound transmission loss simulation calculation on the first mathematical model of the water heater with an air intake pipe to obtain a sound transmission loss value; A first judgment module (20) for judging whether the sound transmission loss value meets the preset modeling requirements; the target sound transmission loss value is obtained by performing a sound transmission loss experimental detection on the physical water heater made according to the first mathematical model; A second mathematical model generation module (30) for generating the second mathematical model of the water heater based on the first mathematical model according to the preset modeling rules if the preset modeling requirements are met; A second simulation calculation module (40) for performing a fluid resistance simulation calculation on the second mathematical model of the water heater to obtain a fluid resistance value; A second judgment module (50) for judging whether the fluid resistance value meets the preset output requirements; The target fluid resistance value is obtained by performing a fluid resistance calculation on the third mathematical model of the water heater without an air intake pipe; An output module (60) for outputting the second mathematical model of the water heater if the preset output requirements are met, so that production personnel can produce a water heater with an air intake channel according to the second mathematical model of the water heater.

9. The generation device according to claim 8, wherein, further comprising: A geometric reconstruction module for performing geometric reconstruction on the preset water heater structural data to obtain geometrically reconstructed data; The preset water heater structural data includes at least the size parameters of the air intake pipe, the water heater shell, the combustion chamber and the air duct shell, and the spacing parameters between any two of them; A mesh division module for dividing the geometrically reconstructed data to obtain the first mathematical model of the water heater.

10. The generation device according to claim 8, wherein, The first simulation calculation module (10) is specifically used for: Determine a first noise value at the virtual position of the preset noise source and a second noise value at a preset virtual detection position according to the first mathematical model of the water heater, as well as the virtual position, frequency, and amplitude of the preset noise source; the virtual position of the preset noise source is inside the first mathematical model of the water heater, and the preset virtual detection position is outside the first mathematical model of the water heater; Use the difference between the first noise value and the second noise value as the sound transmission loss value.

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