Range hood part and manufacturing method of mathematical model thereof

Abstract

The invention provides an extractor hood part and a manufacturing method of a mathematical model of the extractor hood part, and relates to the field of household appliance manufacturing, and the method comprises the following steps: carrying out initial design according to the structure of the extractor hood part to form an initial extractor hood part mathematical model; performing resonance detection on the initial mathematical model of the parts of the range hood, and if a resonance detection result shows that a resonance area exists, modifying the structure of the resonance area according to a preset modification rule to obtain a modified mathematical model of the parts of the range hood; and carrying out resonance detection on the modified mathematical model of the parts of the range hood, and if a resonance detection result shows that a resonance area exists, repeatedly executing the step of modifying the structure of the resonance area according to a preset modification rule until the resonance detection result shows that the resonance area does not exist, and outputting the modified mathematical model of the parts of the range hood. Through the embodiment provided by the invention, the obtained mathematical model meets the anti-vibration requirement.

Description

Technical Field

[0001] The invention relates to the technical field of household appliance manufacturing, and in particular to a method for manufacturing a range hood component and a mathematical model thereof. Background Art

[0002] The range hood is a kitchen appliance that purifies the kitchen environment. It is installed above the kitchen stove and can quickly remove the waste from stove combustion and the oil smoke generated during cooking that is harmful to the human body and discharge it outdoors. At the same time, it condenses and collects the oil smoke, reduces pollution, purifies the air, and has a safety guarantee function of anti-toxicity and explosion-proof

[0003] The range hood will vibrate during operation, which is mainly caused by the vibration of the motor itself and the dynamic balance of the impeller. These vibrations will be transmitted to the entire range hood through the mounting structure, causing the entire machine to vibrate, giving the user a bad experience. The general solution is to reduce the vibration of the motor itself by adjusting the motor parameters and to reduce resonance by adjusting the dynamic balance of the impeller, changing the structure of the entire machine, etc. However, the existing methods are limited to frequency avoidance of 100Hz. There is no good way to avoid other excitation frequencies such as 200Hz, or forced vibrations. The produced range hood parts will still cause the entire machine to vibrate, reducing the user experience. Summary of the invention

[0004] In view of the shortcomings of the existing methods, the present application provides a method for manufacturing range hood components and mathematical models thereof, so as to solve the technical problems that the prior art is limited to the frequency avoidance of 100 Hz, and there is no good way to avoid other excitation frequencies such as 200 Hz, or forced vibration, and the produced range hood components will still cause the whole machine to vibrate, thereby reducing the user experience.

[0005] In a first aspect, an embodiment of the present application provides a method for making a mathematical model of a range hood component, comprising: performing an initial design according to the structure of the range hood component to form an initial range hood component mathematical model; performing a resonance detection on the initial range hood component mathematical model to obtain a first resonance detection result; if the first resonance detection result is that there is no resonance area, outputting the initial range hood component mathematical model; if the first resonance detection result is that there is a resonance area, modifying the structure of the resonance area according to a preset modification rule to obtain a modified range hood component mathematical model; performing a resonance detection on the modified range hood component mathematical model to obtain a second resonance detection result; if the second resonance detection result is that there is no resonance area, outputting the modified range hood component mathematical model; if the second resonance detection result is that there is a resonance area, repeating the step of modifying the structure of the resonance area according to the preset modification rule until the second resonance detection result is that there is no resonance area, and outputting the modified range hood component mathematical model.

[0006] As an optional implementation, the resonance detection is performed on the initial mathematical model of the range hood component to obtain a first resonance detection result, including: performing a resonance detection on the mathematical model of the range hood component to obtain first modal data; and determining whether the mathematical model of the range hood component has a resonance area based on the first modal data, a preset excitation frequency range and a preset resonance area determination rule.

[0007] As an optional implementation, the method of determining whether the mathematical model of the range hood component has a resonance region based on the first modal data, a preset excitation frequency range and a preset resonance region determination rule includes: if any natural frequency included in the first modal data is within the excitation frequency range, and the modal results included in the first modal data meet the resonance region determination rule, then it is determined that the mathematical model of the range hood component has a resonance region; if all natural frequencies included in the first modal data are outside the excitation frequency range, and all modal results included in the first modal data do not meet the resonance region determination rule, then it is determined that the mathematical model of the range hood component does not have a resonance region.

[0008] As an optional implementation, the resonance detection is performed on the modified mathematical model of the range hood component to obtain a second resonance detection result, including: performing a resonance detection on the modified mathematical model of the range hood component to obtain second modal data; determining whether there is a resonance area in the modified mathematical model of the range hood component based on the second modal data, a preset excitation frequency range and a preset resonance area determination rule.

[0009] As an optional embodiment, as an optional embodiment, determining whether there is a resonance area in the modified mathematical model of the range hood component based on the second modal data, a preset excitation frequency range and a preset resonance area determination rule includes: if any natural frequency included in the second modal data is within the excitation frequency range, and the modal results included in the second modal data meet the resonance area determination rule, then it is determined that there is a resonance area in the modified mathematical model of the range hood component; if all natural frequencies included in the second modal data are outside the excitation frequency range, and the modal results included in the second modal data do not meet the resonance area determination rule, then it is determined that there is no resonance area in the modified mathematical model of the range hood component.

[0010] As an optional implementation manner, modifying the structure of the resonance region according to a preset modification rule includes: modifying the structure of the resonance region into a concave matrix.

[0011] As an optional implementation, the recessed matrix includes recessed portions with rectangular bottom surfaces.

[0012] As an optional embodiment, the depth of the recess is greater than or equal to 4 mm and less than or equal to 6 mm; the width of the rectangular bottom of the recess is greater than or equal to 15 mm; the length of the rectangular bottom of the recess is less than or equal to 150 mm; the ratio of the length to the width of the rectangular bottom of the recess is less than or equal to 5; the spacing between adjacent recesses is greater than or equal to 20 mm and less than or equal to 30 mm.

[0013] As an optional implementation, the method further includes: manufacturing range hood components according to the initial range hood component mathematical model or the modified range hood component mathematical model; performing resonance detection on the range hood component to obtain a third resonance detection result; if the third resonance detection result is that there is no resonance area, using the initial range hood component mathematical model or the modified range hood component mathematical model as the mathematical model for producing range hood components; if the third resonance detection result is that there is a resonance area, modifying the resonance area structure of the initial range hood component mathematical model or the modified range hood component mathematical model according to a preset modification rule; repeating the step of performing resonance detection on the modified range hood component mathematical model to obtain a second resonance detection result, until the third resonance detection result is that there is no resonance area, and using the modified range hood component mathematical model obtained for the last time as the mathematical model for producing range hood components.

[0014] In a second aspect, an embodiment of the present application provides a range hood component, which is manufactured by a mathematical model obtained by the method for manufacturing a mathematical model of a range hood component described in any of the aforementioned embodiments.

[0015] The present application provides a method for manufacturing a range hood component and a mathematical model thereof. The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0016] By using the method for making a mathematical model of range hood components provided in an embodiment of the present application, a simulated resonance test is performed on the initial mathematical model of range hood components. If a resonance area exists in the resonance test result, it means that the initial mathematical model of range hood components has not avoided the excitation frequency or the resonance formed due to insufficient local stiffness, and has not met the vibration avoidance requirement. Thereafter, the detected mathematical model is modified and tested again until the mathematical model meets the vibration avoidance requirement. The mathematical model that meets the vibration avoidance requirement is used to make a physical structure to reduce the vibration of the range hood and enhance the user experience.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A schematic flow chart of a method for making a mathematical model of a range hood component provided in an embodiment of the present application;

[0020] Figure 2 A schematic structural diagram of a modified mathematical model of a range hood component in a method for making a mathematical model of a range hood component provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of modal calculation results of a range hood component mathematical model after modification of a method for making a range hood component mathematical model provided in an embodiment of the present application;

[0022] Figure 4 A schematic structural diagram of a mathematical model of a range hood component after being modified again in a method for making a mathematical model of a range hood component provided in an embodiment of the present application; DETAILED DESCRIPTION

[0023] The present application is described in detail below, and examples of embodiments of the present application are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components with the same or similar functions. In addition, if the detailed description of the known technology is unnecessary for the features of the present application shown, it will be omitted. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0024] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0025] like Figure 1-4 As shown, the embodiment of the present application provides a method for making a mathematical model of a range hood component, which mainly includes steps S1-S7:

[0026] Step S1: Performing an initial design based on the structure of the range hood components to form an initial range hood component mathematical model.

[0027] The range hood parts may be a volute, a top plate and a back plate of a smoke hood, and other parts. The top plate and the back plate of the smoke hood are connected to form a top back plate, and the top back plate is described in detail in the embodiment of the present application.

[0028] The mathematical model of the top and back plates is established by using finite element analysis software (such as Hypermesh, ABAQUS, etc.) and top and back plate parameters (such as size parameters, etc.). Before the resonance detection, the mathematical model of the top and back plates is geometrically cleaned and repaired, the damaged surfaces are repaired, the duplicate surfaces are deleted, and the redundant feature lines are compressed. The repaired mathematical model of the top and back plates is obtained and divided by quadrilateral meshes. Through meshless analysis, it is determined that the modal analysis results of the mathematical model of the top and back plates tend to be stable after the mesh size reaches 1mm.

[0029] The quality of the divided mesh is checked, with a focus on the unit's warpage, length-to-short side ratio, Jacobi and other parameters to ensure that the unit quality meets the calculation accuracy. For the divided mesh, the top and back plate mathematical models are given parameters such as elastic modulus, Poisson's ratio, and density.

[0030] Step S2: Perform resonance detection on the initial range hood component mathematical model to obtain a first resonance detection result.

[0031] The functional modules of the finite element analysis software are used to set the corresponding modal calculation conditions, the natural frequency is analyzed by free modal analysis, and the first resonance detection result is determined according to the modal analysis result.

[0032] Step S3: if the first resonance detection result is that there is no resonance area, then outputting the initial range hood component mathematical model.

[0033] The first resonance test result is the test result of the initial smoking machine parts mathematical model. If the first resonance test result shows that there is no resonance area, it means that in the mathematical model simulation test stage, the top and back plate mathematical model has met the vibration avoidance requirements and can be used to make a physical structure.

[0034] Step S4: If the first resonance detection result shows that a resonance region exists, the structure of the resonance region is modified according to a preset modification rule to obtain a modified mathematical model of the range hood component.

[0035] If the first resonance detection result shows that a resonance area exists, it means that during the mathematical model simulation detection stage, the top and back plate mathematical model did not avoid the excitation frequency or formed resonance due to insufficient local stiffness, and did not meet the vibration avoidance requirements. It cannot be used to make a physical structure and the current top and back plate mathematical model needs to be modified.

[0036] Step S5: Perform resonance detection on the modified mathematical model of the range hood components to obtain a second resonance detection result.

[0037] The modified mathematical model of the top and back plates is subjected to resonance detection to determine whether the vibration-proof requirement is met. The difference between step S5 and step S2 is that the detection object is different. The initial mathematical model of the smoking machine parts in step S2 is used, while the modified mathematical model of the smoking machine parts in step S5 is used.

[0038] Step S6: If the second resonance detection result is that there is no resonance area, the modified mathematical model of the range hood components is output.

[0039] The second resonance detection result is the detection result of the modified mathematical model. If the second resonance detection result shows that there is no resonance area, it means that in the mathematical model simulation detection stage, the modified top and back plate mathematical model meets the vibration avoidance requirements and can be used to make a physical structure.

[0040] Step S7: If the second resonance detection result shows that a resonance region exists, the step of modifying the structure of the resonance region according to a preset modification rule is repeated until the second resonance detection result shows that no resonance region exists, and the modified mathematical model of the range hood component is output.

[0041] If the second resonance detection result shows that there is a resonance area, it means that in the mathematical model simulation detection stage, the modified top back mathematical model does not meet the vibration avoidance requirements and cannot be used to make a physical structure. In order to meet the vibration avoidance requirements, the current top back mathematical model needs to be modified again, and the modified top back mathematical model also needs to be verified until it meets the vibration avoidance requirements. The mathematical model that meets the vibration avoidance requirements is output and used to make a physical structure.

[0042] By using the method for making a mathematical model of range hood components provided in an embodiment of the present application, a simulated resonance test is performed on the initial mathematical model of range hood components. If a resonance area exists in the resonance test result, it means that the initial mathematical model of range hood components has not avoided the excitation frequency or the resonance formed due to insufficient local stiffness, and has not met the vibration avoidance requirement. Thereafter, the detected mathematical model is modified and tested again until the mathematical model meets the vibration avoidance requirement. The mathematical model that meets the vibration avoidance requirement is used to make a physical structure to reduce the vibration of the range hood and enhance the user experience.

[0043] As an optional implementation, the resonance detection of the initial range hood component mathematical model in the aforementioned step S2 to obtain a first resonance detection result includes the following steps:

[0044] Perform resonance detection on the initial range hood component mathematical model to obtain first modal data;

[0045] It is determined whether a resonance region exists in the mathematical model of the range hood component according to the first modal data, a preset excitation frequency range and a preset resonance region determination rule.

[0046] In this step, the first modal data at least includes the corresponding relationship between the order and the natural frequency and the modal calculation result (such as Figure 3 As shown, it is data combining images, colors, parameters, etc.; wherein the image is actually a moving picture).

[0047] When the natural frequency is close to or the same as the excitation frequency of the motor, a resonance region will exist in the initial top back plate mathematical model. Taking the excitation frequency of 100 Hz as an example, the excitation frequency range is greater than or equal to 90 Hz and less than or equal to 110 Hz; due to simulation errors, the excitation frequency range can be adjusted as appropriate. The resonance region determination rule can be based on the vibration amplitude, for example, the region with a vibration amplitude greater than a preset threshold is regarded as a resonance region; wherein the preset threshold can be set according to actual conditions. Optionally, the region with a larger vibration range is the resonance region.

[0048] As an optional implementation, the above steps of determining whether there is a resonance region in the mathematical model of the range hood component according to the first modal data, the preset excitation frequency range and the preset resonance region determination rule include:

[0049] If any natural frequency included in the first modal data is within the excitation frequency range, and the modal result included in the first modal data meets the resonance region determination rule, then it is determined that the mathematical model of the range hood component has a resonance region;

[0050] If all natural frequencies included in the first modal data are outside the excitation frequency range, and all modal results included in the first modal data do not meet the resonance region determination rule, it is determined that the mathematical model of the range hood component does not have a resonance region.

[0051] For example, the first modal data includes the correspondence between the first 50 orders and the natural frequencies, wherein the natural frequency of the 33rd order is 100.01 Hz, which is within the aforementioned excitation frequency range. Figure 3 As shown, Figure 3 The range within the dotted circle is the resonance region.

[0052] As an optional implementation, the modified range hood component mathematical model is subjected to resonance detection in the aforementioned step to obtain a second resonance detection result, including:

[0053] Perform resonance detection on the modified mathematical model of the range hood parts to obtain the second modal data;

[0054] According to the second modal data, a preset excitation frequency range and a preset resonance region determination rule, it is determined whether the modified mathematical model of the range hood component has a resonance region.

[0055] As an optional implementation, the above steps of determining whether there is a resonance region in the mathematical model of the range hood component according to the second modal data, the preset excitation frequency range and the preset resonance region determination rule include:

[0056] If any natural frequency included in the second modal data is within the excitation frequency range, and the modal result included in the second modal data meets the resonance region determination rule, it is determined that the modified range hood component mathematical model has a resonance region;

[0057] If all natural frequencies included in the second modal data are outside the excitation frequency range, and the modal results included in the second modal data do not meet the resonance region determination rule, it is determined that the modified mathematical model of the range hood component does not have a resonance region.

[0058] The specific actions of the above two steps are similar to the above steps, so they will not be repeated here.

[0059] Based on the above embodiment, in this embodiment, before the mathematical model is modified, the 33rd order natural frequency is 100.01 Hz. After the mathematical model is modified, the 33rd order natural frequency is increased from 100.01 Hz to 117 Hz. 117 Hz is outside the excitation frequency range, and no resonance region appears. It can be determined that the modified mathematical model of the range hood component does not have a resonance region. Figure 3 As shown, Figure 4 The range in the middle circle is the modified resonance area.

[0060] As an optional implementation, in the aforementioned step, the structure of the resonance region is modified according to a preset modification rule, including: modifying the structure of the resonance region into a concave matrix.

[0061] During the stage of manufacturing the physical structure, the recessed matrix is ​​manufactured by a pressing process, and the distribution of the recessed matrix can be set and adjusted according to actual conditions.

[0062] As an optional implementation, the recessed matrix includes recessed portions with rectangular bottom surfaces.

[0063] The bottom surface of the concave portion may be in any shape. In this embodiment, the bottom surface of the concave portion is in a rectangular shape, which can meet the requirements of the processing technology and the appearance, and can also be assembled with other parts.

[0064] As an optional embodiment, the depth of the recess is greater than or equal to 4 mm and less than or equal to 6 mm; the width of the rectangular bottom of the recess is greater than or equal to 15 mm; the length of the rectangular bottom of the recess is less than or equal to 150 mm; the ratio of the length to the width of the rectangular bottom of the recess is less than or equal to 5; the spacing between adjacent recesses is greater than or equal to 20 mm and less than or equal to 30 mm.

[0065] The greater the depth of the concave portion, the better, but the strength of the overall structure must be met to avoid long and large weak areas, while also avoiding particularly densely pressed areas.

[0066] As an optional implementation, the method for preparing the mathematical model of the range hood parts further includes:

[0067] manufacturing range hood parts according to the initial range hood parts mathematical model or the modified range hood parts mathematical model;

[0068] Performing resonance detection on the range hood components to obtain a third resonance detection result;

[0069] If the third resonance detection result is that there is no resonance area, the initial range hood component mathematical model or the modified range hood component mathematical model is used as a mathematical model for producing the range hood component;

[0070] If the third resonance detection result is that a resonance region exists, modifying the resonance region structure of the initial range hood component mathematical model or the modified range hood component mathematical model according to a preset modification rule;

[0071] Repeat the step of performing resonance detection on the modified mathematical model of the range hood parts to obtain a second resonance detection result, until the third resonance detection result shows that there is no resonance area, and use the modified mathematical model of the range hood parts obtained last time as the mathematical model for producing the range hood parts.

[0072] Since errors may occur in simulation detection, the above steps can be used to perform physical verification when outputting any mathematical model that does not have a resonance area (for example, the output of the initial range hood component mathematical model and the output of any modified range hood component mathematical model).

[0073] Based on the above embodiments, the modified top back plate mathematical model output is used as an example for explanation in this embodiment. After the top back plate is manufactured according to the modified top back plate mathematical model, the vibration and noise data of the top back plate are tested using an Lms device (a vibration noise detection device) to determine whether resonance occurs in the resonance area that appears in the simulation detection stage, and to confirm whether the vibration is a resonance caused by the coincidence of the excitation frequency and the natural frequency (the natural frequency is within the excitation frequency range) or a forced vibration under the action of the excitation force due to weak stiffness.

[0074] If the excitation frequency and the natural frequency do not coincide (the natural frequency is outside the excitation frequency range) and resonance still occurs, it is necessary to increase the stiffness of the resonance area and redesign the recess matrix of the resonance area, for example, by reducing the depth of the recess.

[0075] If the excitation frequency and the natural frequency coincide (the natural frequency is within the excitation frequency range) and resonance occurs, the concave matrix in the resonance area is redesigned.

[0076] Redesign the depression matrix of the resonance area to obtain the modified mathematical model of the top and back plates, first use simulation resonance detection (detected using the aforementioned detection steps, which will not be repeated here) to first determine that there is no resonance area in the modified mathematical model of the top and back plates, and then make a physical top and back plate according to the newly obtained modified mathematical model of the top and back plates, and then use the Lms equipment to test the vibration and noise data of the top and back plates to re-determine whether resonance occurs in the resonance area that appeared in the simulation detection stage, and confirm whether the vibration is a resonance caused by the coincidence of the excitation frequency and the natural frequency or a forced vibration under the action of the excitation force due to weak stiffness; repeat the above steps until the second resonance detection results and the third resonance detection results are both that there is no resonance area, that is, the simulation detection results and the physical detection results are both that there is no resonance area, indicating that the modified range hood component mathematical model obtained for the last time has achieved the vibration avoidance effect and can be used as a mathematical model for producing range hood components.

[0077] Based on the same inventive concept, an embodiment of the present application provides a range hood component, which is manufactured by a mathematical model obtained according to the method for manufacturing a mathematical model of a range hood component in any of the aforementioned embodiments.

[0078] By applying the embodiments of the present application, at least the following beneficial effects can be achieved:

[0079] The range hood components provided in the embodiments of the present application are subjected to a simulated resonance test on the mathematical model of the range hood components before manufacturing. If a resonance area exists in the resonance test result, it means that the initial mathematical model of the range hood components has not avoided the excitation frequency or the resonance formed due to insufficient local stiffness, and has not met the vibration avoidance requirement. Thereafter, the tested mathematical model is modified and tested again until the mathematical model meets the vibration avoidance requirement. The mathematical model that meets the vibration avoidance requirement is used to manufacture a physical structure to reduce the vibration of the range hood and enhance the user experience.

[0080] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0081] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0082] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0083] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for making a mathematical model of range hood parts, characterized in that: include: Performing initial design based on the structure of range hood parts to form an initial range hood parts mathematical model; Performing resonance detection on the initial range hood component mathematical model to obtain a first resonance detection result; If the first resonance detection result is that there is no resonance area, outputting the initial range hood component mathematical model; If the first resonance detection result indicates that a resonance region exists, the structure of the resonance region is modified according to a preset modification rule to obtain a modified mathematical model of the range hood component; Perform resonance detection on the modified mathematical model of the range hood parts to obtain a second resonance detection result; If the second resonance detection result is that there is no resonance area, then the modified mathematical model of the range hood parts is output; If the second resonance detection result shows that a resonance region exists, the step of modifying the structure of the resonance region according to a preset modification rule is repeated until the second resonance detection result shows that no resonance region exists, and the modified mathematical model of the range hood component is output.

2. The method for making a mathematical model of range hood parts according to claim 1, characterized in that: The resonance detection is performed on the initial range hood component mathematical model to obtain a first resonance detection result, including: Perform resonance detection on the mathematical model of the range hood parts to obtain the first modal data; It is determined whether the mathematical model of the range hood component has a resonance region according to the first modal data, a preset excitation frequency range and a preset resonance region determination rule.

3. The method for making a mathematical model of range hood parts according to claim 2, characterized in that: The step of determining whether the range hood component mathematical model has a resonance region according to the first modal data, a preset excitation frequency range and a preset resonance region determination rule includes: If any natural frequency included in the first modal data is within the excitation frequency range, and the modal result included in the first modal data meets the resonance region determination rule, it is determined that the mathematical model of the range hood component has a resonance region; If all natural frequencies included in the first modal data are outside the excitation frequency range, and all modal results included in the first modal data do not meet the resonance region determination rule, it is determined that the mathematical model of the range hood component does not have a resonance region.

4. The method for making a mathematical model of range hood parts according to claim 1, characterized in that: The resonance detection is performed on the modified range hood component mathematical model to obtain a second resonance detection result, including: Perform resonance detection on the modified mathematical model of the range hood parts to obtain the second modal data; According to the second modal data, a preset excitation frequency range and a preset resonance region determination rule, it is determined whether the modified mathematical model of the range hood component has a resonance region.

5. The method for making a mathematical model of range hood parts according to claim 4, characterized in that: The step of determining whether the modified range hood component mathematical model has a resonance region according to the second modal data, a preset excitation frequency range and a preset resonance region determination rule includes: If any natural frequency included in the second modal data is within the excitation frequency range, and the modal result included in the second modal data meets the resonance region determination rule, it is determined that the modified range hood component mathematical model has a resonance region; If all the natural frequencies included in the second modal data are outside the excitation frequency range, and the modal results included in the second modal data do not meet the resonance region determination rule, it is determined that the modified range hood component mathematical model does not have a resonance region.

6. The method for preparing a mathematical model of a range hood component according to any one of claims 1 to 5, characterized in that: The step of modifying the structure of the resonance region according to a preset modification rule includes: The structure of the resonance region is modified into a matrix of depressions.

7. The method for making a mathematical model of range hood parts according to claim 6, characterized in that: The recessed matrix includes recessed portions with rectangular bottom surfaces.

8. The method for making a mathematical model of range hood parts according to claim 7, characterized in that: The depth of the recess is greater than or equal to 4 mm and less than or equal to 6 mm; The width of the rectangular bottom surface of the recess is greater than or equal to 15 mm; The length of the rectangular bottom surface of the recess is less than or equal to 150 mm; The ratio of the length to the width of the rectangular bottom surface of the concave portion is less than or equal to 5; The distance between adjacent recesses is greater than or equal to 20 mm and less than or equal to 30 mm.

9. The method for making a mathematical model of range hood parts according to claim 1, characterized in that: The method further comprises: manufacturing range hood parts according to the initial range hood parts mathematical model or the modified range hood parts mathematical model; Performing resonance detection on the range hood components to obtain a third resonance detection result; If the third resonance detection result is that there is no resonance area, the initial range hood component mathematical model or the modified range hood component mathematical model is used as a mathematical model for producing the range hood component; If the third resonance detection result is that a resonance region exists, modifying the resonance region structure of the initial range hood component mathematical model or the modified range hood component mathematical model according to a preset modification rule; Repeat the step of performing resonance detection on the modified mathematical model of range hood parts to obtain a second resonance detection result, until the third resonance detection result shows that there is no resonance area, and use the modified mathematical model of range hood parts obtained last time as the mathematical model for producing range hood parts.

10. A range hood component, characterized in that: The mathematical model is manufactured according to the method for manufacturing the mathematical model of range hood parts according to any one of claims 1 to 9.

Images