CN108959835B - Intensity simulation analysis method of loudspeaker basin stand in screw installation process - Google Patents
Intensity simulation analysis method of loudspeaker basin stand in screw installation process Download PDFInfo
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- CN108959835B CN108959835B CN201811137641.6A CN201811137641A CN108959835B CN 108959835 B CN108959835 B CN 108959835B CN 201811137641 A CN201811137641 A CN 201811137641A CN 108959835 B CN108959835 B CN 108959835B
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
Abstract
The invention relates to a strength simulation analysis method of a loudspeaker basin frame in a screw mounting process, which can help to obtain the strength of the loudspeaker basin frame under a specified torque and help to quickly find out a proper screw mounting torque. The method comprises the steps of obtaining parameters of a loudspeaker basin frame and a screw, drawing an assembly model of the loudspeaker basin frame and the screw, building a finite element model of the loudspeaker basin frame and the screw according to the assembly model, solving the finite element model by adopting a finite element method, and obtaining the size and distribution diagram of stress and strain on the loudspeaker basin frame when the specified torque is reached in the screw mounting process through post-treatment.
Description
Technical Field
The invention relates to the field of speakers, in particular to a strength simulation analysis method of a speaker basin frame in a screw installation process.
Background
The loudspeaker frame is an important part for maintaining the structural stability of the loudspeaker, plays roles in supporting and protecting components such as a vibrating diaphragm, a flicking wave, a folding ring and the like, and also has the role in connecting other components. The basin frame structure has enough strength and is a precondition for ensuring the smooth installation of the loudspeaker in the early stage and the stable work in the later stage. A common way of fixing the loudspeaker is by means of screws. In the installation process of the screw, the installation torque is very important, the stability of connection of the loudspeaker and other parts cannot be guaranteed due to the fact that the torque is small, and the basin frame is broken due to the fact that the torque is too large. However, the conventional method has the following problems: 1) In the research and development process of the loudspeaker, a general test method needs to copy the test of the basin stand, and has the problems of long time consumption and high cost; 2) The test method can only obtain qualitative conclusion about whether the basin frame is damaged, can not obtain stress and strain values of each point on the basin frame, and can not help designers to conduct quantitative structure optimization.
Therefore, simulation analysis is carried out on the structural strength of the basin frame in the screw installation process, so that the strength of the loudspeaker basin frame under the specified torque can be accurately obtained, and the safety of the basin frame in the whole installation process is ensured. Meanwhile, the design personnel can find out the proper torque quickly to finish the installation of the loudspeaker.
Disclosure of Invention
The invention aims to provide a strength simulation analysis method of a loudspeaker basin frame in the screw installation process, which can help to obtain the strength of the loudspeaker basin frame under specified torque and help to quickly find out proper screw installation torque.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the method comprises the steps of obtaining parameters of a loudspeaker basin frame and a screw, drawing an assembly model of the loudspeaker basin frame and the screw, building a finite element model of the loudspeaker basin frame and the screw according to the assembly model, solving the finite element model by adopting a finite element method, and obtaining the size and distribution diagram of stress and strain on the loudspeaker basin frame when the specified torque is reached in the screw mounting process through post-treatment.
Further, solving the finite element model by adopting a steady-state analysis method, wherein a theoretical equation to be solved is as follows:
wherein [ M]Is a quality matrix [ C]Is a damping matrix [ K ]]In the form of a static stiffness matrix,as the node acceleration vector,is a node velocity vector, { X } is a node displacement vector, and { F } is an excitation load vector.
Further, the contact pressure of the screw and the contact surface of the speaker frame is obtained by post-processing when the specified torque is reached in the screw mounting process.
Further, the strength simulation analysis method comprises the step of obtaining the geometric dimensions of the speaker frame and the screw, the material properties of the materials used for the frame and the screw, the constraint conditions and the load conditions of the frame and the screw.
Further, the assembly model is a three-dimensional geometric model manufactured by three-dimensional drawing software. The finite element model for establishing the loudspeaker frame and the screw by adopting simulation analysis software comprises the following steps:
s21, importing a three-dimensional geometric model of the loudspeaker basin frame and the screw into finite element analysis software, and establishing a geometric model of simulation analysis of the intensity of the loudspeaker basin frame in the screw installation process;
s22, setting a physical field and a material model;
s23, defining boundary conditions and loads;
s24, defining material properties;
s25, dividing grids.
Furthermore, in step S21, the basin stand and the screws can be reasonably simplified to reduce the calculation amount; after the three-dimensional geometric model is imported, redundant points, lines, planes or volumes in the finite element model are removed. The method is characterized in that in the finite element model construction process, redundant points, lines, planes and volumes in the geometric model can greatly influence the grid quality, so that after the geometric model is imported, the redundant points, lines, planes and volumes in the model are removed by adopting a geometric cleaning function, and the grid quality is improved.
Further, in step S22, a solid mechanical physical field is selected, and the speaker frame is set as a wire elastic material model and is provided with material damping;
still further, step S23 includes:
contact pairs and constraints thereof: setting the contact boundary of the screw and the basin frame as a contact pair, setting the contact surface on the screw as a source boundary, and setting the contact surface on the loudspeaker basin frame as a target boundary; setting constraint conditions for contact pairs, including a calculation method of contact pressure, a penalty factor and boundary constraint; and/or
Boundary fixation constraint: setting the boundary of the loudspeaker basin stand, which is contacted with the component for installing the loudspeaker, as fixed constraint; and/or
Body load: the screw is loaded with a total force along the screwing direction, wherein the total force is an axial force when the screw is screwed in, and the magnitude F and the mounting torque T meet the following relation:
wherein k is a torque coefficient; d is the nominal diameter of the screw; and/or
Specifying displacement: the displacement of the screw on the face perpendicular to the screwing direction is set to 0.
Still further, in step S24, the material properties include young 'S modulus, density, poisson' S ratio, damping.
Further, in step S25, a finite element mesh model is generated by specifying a mesh cell type and a mesh size, and the speaker frame and the screws are of a free tetrahedron mesh type.
Compared with the prior art, the invention has the following advantages:
1) The finite element method is applied to the analysis of the strength of the loudspeaker frame in the screw mounting process, so that the dependence of the traditional test method on samples is overcome, the sample preparation times of the loudspeaker (including the frame) samples in the research and development process are reduced, the design efficiency is improved, and the research and development cost is saved. 2) The values and distribution conditions of the stress and the strain of each point on the basin frame can be obtained through simulation analysis under different installation torques of the screw, quantitative structural optimization and improvement are facilitated, material use is reasonably controlled, and resources are saved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of intensity simulation analysis according to the present invention;
FIG. 2 shows a geometric model of a simulation analysis of the loudspeaker cone intensity during screw installation;
fig. 3 shows a contact pair of a screw with a loudspeaker frame;
fig. 4 shows a fixed constraint surface on a speaker frame;
FIG. 5 shows the bulk load on the screw;
fig. 6 shows the specified displacement constraint on the screw.
Fig. 7 shows a finite element mesh model of a simulation analysis of the loudspeaker cone intensity during screw mounting.
Fig. 8 is a stress distribution diagram on a loudspeaker frame.
Fig. 9 is a distribution diagram of stress greater than yield strength location points on a speaker frame.
Fig. 10 shows a strain distribution diagram on a loudspeaker frame.
Fig. 11 shows a displacement distribution diagram on a loudspeaker frame.
Fig. 12 shows the contact pressure distribution diagram on the contact surface of the speaker frame and the screw.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention takes an assembly model of a loudspeaker basin frame and a screw as an example, and uses a numerical simulation method to analyze the strength of the basin frame in the screw installation process. The numerical simulation analysis method of the loudspeaker frame strength does not depend excessively on product samples, and the size and the distribution of stress and strain on the frame under the action of different screw torques can be calculated by establishing a finite element simulation analysis model of the loudspeaker frame and the screw assembly. Then, by comparing the simulation value of the frame strength with the theoretical limit value (generally, the yield strength or the breaking strength is taken), it is further determined whether the frame structure meets the requirement of maintaining stable operation of the speaker under a certain torque. In the research and development period, the modified simulation model is used for replacing the anti-copy sample, so that more resources and time can be saved.
Fig. 1 shows a flow chart of the simulation analysis method, and the specific steps are as follows:
(1) Preparation of
And drawing an assembly drawing of the loudspeaker basin frame and the screw. The model is drawn by three-dimensional drawing software.
(2) Establishing a finite element model
1) Adding spatial dimensions, physical field interfaces, and study types. The COMSOL Multiphysics software was opened, the spatial dimension was set to "three-dimensional", the physical field was selected to "solid mechanics", and the study type was selected to "steady state".
2) And establishing a geometric model for simulation analysis of the strength of the loudspeaker basin frame in the screw installation process. As shown in fig. 2. The modeling process is as follows:
A. a speaker and screw assembly model is introduced: the assembly model of the loudspeaker frame and the screw is led in by adopting the operation of 'geometric' correlation. In order to reduce the calculation amount, the basin stand only adopts a 1/4 symmetrical structure comprising one mounting hole.
B. Geometric cleaning: and adopting a geometric cleaning function under the geometric operation to clean redundant points, lines, planes and bodies in the model.
C. Under "form association/assembly", the geometry "form assembly" is set and the automatic creation of "contact pairs" is set.
3) A physical field is set. In the setting window of the solid mechanics, the setting of the solid mechanics is applicable to all geometric domains.
4) A material model is provided. The material model of the basin frame and the corresponding geometric domain of the screw is set as a 'line elastic material' under the 'solid mechanics' physical field, a 'damping' functional interface is added for the line elastic material, and the 'damping' is only applicable to the geometric domain of the basin frame.
5) Boundary conditions and loads are set. The method comprises the following steps of respectively setting a contact pair and constraint conditions, boundary fixing constraints, body loads and specified displacement of the contact pair under a physical field of 'solid mechanics', wherein the detailed setting steps are as follows:
"contact pair" and constraints thereof: under "define > contact pair 1", the contact surface on the screw is set to the "source boundary" (shown as a in fig. 3), and the contact surface on the basin stand is set to the "target boundary" (shown as B in fig. 3). The contact is added under the condition of 'solid mechanics', the contact pressure method of the contact pair is set as 'penalty', and a default 'penalty factor' is adopted.
B. Boundary fixation constraint: the loudspeaker frame shown in fig. 4 is arranged to be "fixedly restrained" at the boundary where it contacts other structural members for mounting the loudspeaker, such as a mounting bracket, a door panel, a wall, etc., to which the loudspeaker frame is specifically attached.
C. Body load: on the geometric domain of the screw shown in fig. 5, a total force of magnitude 4125N is applied in the direction of the screw advance, i.e. in the negative z-axis direction. Here, when the torque T and the axial force F are calculated, the torque coefficient=0.2, the screw nominal diameter=4 mm, and when f=4125n, t=3.3n·m.
D. Specifying displacement: in the geometric domain of the screw shown in fig. 6, the screw's direction of advance is along the negative z-axis, and it is desirable to specify a displacement of 0 for the screw in the x-direction and y-direction, i.e., a displacement of 0 on a plane perpendicular to the screw's direction of advance.
6) Material properties are defined. And adopting the related operation of ' materials ', and respectively setting material parameters of the basin frame and the screws corresponding to the geometric domain in the model, wherein the material parameters to be set comprise Young modulus, density, poisson's ratio and damping. The material parameters of the speaker frame and screws defined in this example are shown in table 1.
TABLE 1
7) And (5) dividing grids. Fig. 7 is a finite element mesh model divided in the present embodiment, and the mesh division steps are as follows:
the mesh types of the corresponding geometric domains of the designated loudspeaker frame and the screws are the free tetrahedron mesh and the customized free tetrahedron mesh size: the maximum unit size on the contact surface of the screw and the basin frame is set to be 0.002mm, and other positions adopt default grid sizes. Finally, the "all build" generates a finite element mesh as shown in FIG. 7.
The grids of the corresponding boundaries of the contact pairs are subjected to grid refinement in a mode of customizing the grid size, so that the accuracy of a calculation result is improved. In addition, in other embodiments, the calculation result can be more accurate by properly refining grids at other positions through customizing the grid size.
(3) Solving and post-processing
1) Steady state studies.
A. Add "steady state" study: and solving the finite element model established in the steps by adopting a finite element method, wherein the theoretical equation is based on the following:
in the formula, [ M ]]Is a quality matrix [ C]Is a damping matrix [ K ]]In the form of a static stiffness matrix,as the node acceleration vector,is a node velocity vector, { X } is a node displacement vector, and { F } is an excitation load vector. The "steady state" solution is used in the simulation analysis of the loudspeaker frame strength.
B. And (3) calculating: after the setting is completed, the finite element model is solved, and the calculation process is realized by adopting a COMSOL Multiphysics software built-in algorithm.
2) Post-treatment: the post-processing can be used for obtaining 1) the size and distribution diagram of the stress and the strain on the loudspeaker basin stand when the specified torque is reached in the screw installation process; 2) And in the process of installing the screw, when the specified torque is reached, the contact pressure on the contact surface of the screw and the basin frame is increased. The results that can be viewed by post-processing are specifically as follows:
A. adding a three-dimensional drawing group, drawing by adopting a 'body', inputting an expression solid.mises, hiding a screw geometric domain, only displaying a basin frame geometric domain, and drawing to obtain the stress distribution on the loudspeaker basin frame when T=3.3N.m is shown in fig. 8. As is clear from the figure, the stress applied near the mount hole of the pot frame is large, and the stress near the mount hole of the pot frame increases with an increase in screw torque.
B. Adding a three-dimensional drawing group, drawing by adopting a 'body', inputting an expression solid.mises is more than or equal to 4e5[ Pa ], hiding a screw geometric domain, only displaying a basin frame geometric domain, and drawing to obtain the stress distribution on the loudspeaker basin frame when T=3.3N.m, wherein the stress distribution is shown in figure 9.
C. Adding a three-dimensional drawing group, drawing by adopting a 'body', inputting an expression solid. Evol, hiding a screw geometric domain, only displaying a basin frame geometric domain, and drawing to obtain the strain distribution on the loudspeaker basin frame when T=3.3N.m, wherein the strain distribution is shown in fig. 10.
D. Adding a three-dimensional drawing group, drawing by adopting a 'body', inputting an expression solid.mises, hiding a basin frame geometric domain, only displaying a screw geometric domain, and when T=3.3N.m is obtained by drawing, the stress distribution on the screw is shown in fig. 11.
E. Adding a three-dimensional drawing group, drawing by adopting a surface, inputting an expression solid.Tn, and drawing to obtain the stress distribution on the contact surface of the loudspeaker frame and the screw when T=3.3N.m, wherein the stress distribution is shown in fig. 12.
Wherein, the speaker basin frame geometric model is a geometric model after reasonable simplification. The model simplification method is many, and can be realized by adopting professional three-dimensional drawing software or adopting the 'geometric' related function of finite element software (such as COMSOL Multiphysics).
The finite element analysis software is COMSOL Multiphysics, and is multi-physical-field simulation analysis software, and the main functions comprise geometric model establishment, grid division, multi-physical-field setting and solving and result imaging display.
The above-described embodiments are provided for illustrating the technical concept and features of the present invention, and are intended to be preferred embodiments for those skilled in the art to understand the present invention and implement the same according to the present invention, not to limit the scope of the present invention.
Claims (9)
1. The method is characterized by obtaining parameters of a loudspeaker frame and a screw and drawing an assembly model of the loudspeaker frame and the screw, wherein a 1/4 symmetrical structure of the loudspeaker frame and the screw is obtained from the assembly model, a finite element model of the loudspeaker frame and the screw is built according to the assembly model, a steady state solving is carried out on the finite element model by adopting a finite element method, and when a specified torque is reached in the screw mounting process, the size and distribution diagram of stress and strain on the loudspeaker frame and the contact pressure of the screw and the contact surface of the loudspeaker frame are obtained through post-treatment, so that the strength of the loudspeaker frame under the specified torque and the proper torque for mounting the loudspeaker are obtained; when the finite element model is built, boundary conditions and loads are defined, and the contact relation between the simulation basin frame and the screw is achieved through contact, and the method specifically comprises the following steps:
contact pairs and constraints thereof: setting the contact boundary of the screw and the basin frame as a contact pair, setting the contact surface on the screw as a source boundary, and setting the contact surface on the loudspeaker basin frame as a target boundary; setting constraint conditions for contact pairs, including a calculation method of contact pressure, a penalty factor and boundary constraint;
boundary fixation constraint: setting the boundary of the speaker basin stand, which is contacted with a component for mounting the speaker, as a fixed constraint, wherein the component for mounting the speaker comprises a fixing frame, a door plate or a wall;
body load: loading a total force along the screwing direction of the screw on the screw, wherein the total force is an axial force when the screw is screwed in;
specifying displacement: the displacement of the screw on the face perpendicular to the screwing direction is set to 0.
2. The intensity simulation analysis method according to claim 1, wherein: the theoretical equation solved is as follows:
wherein [ M]Is a quality matrix [ C]Is a damping matrix [ K ]]In the form of a static stiffness matrix,for the node acceleration vector, ++>Is a node velocity vector, { X } is a node displacement vector, and { F } is an excitation load vector.
3. The intensity simulation analysis method according to claim 1, wherein: the strength simulation analysis method comprises the step of obtaining the geometric dimensions of the loudspeaker frame and the screw, the material properties of the materials used for the frame and the screw, and the constraint conditions and the load conditions on the frame and the screw.
4. The intensity simulation analysis method according to claim 1, wherein: the assembly model is a three-dimensional geometric model drawn by three-dimensional drawing software, and the finite element simulation analysis model for establishing the loudspeaker basin stand and the screw by adopting simulation analysis software comprises the following steps:
s21, importing a three-dimensional geometric model of the loudspeaker basin frame and the screw into finite element analysis software, and establishing a geometric model of simulation analysis of the intensity of the loudspeaker basin frame in the screw installation process;
s22, setting a physical field and a material model;
s23, defining boundary conditions and loads;
s24, defining material properties;
s25, dividing grids.
5. The intensity simulation analysis method of claim 4, wherein: in step S21, after the three-dimensional geometric model is imported, redundant points, lines, planes or volumes in the finite element model are removed.
6. The intensity simulation analysis method of claim 4, wherein: in step S22, a solid mechanical physical field is selected, and the speaker frame is set as a wire elastic material model and material damping is set.
7. The intensity simulation analysis method of claim 4, wherein:
the magnitude F of the axial force and the mounting torque T satisfy the following relation:
wherein k is a torque coefficient; d is the nominal diameter of the screw.
8. The intensity simulation analysis method of claim 4, wherein: in step S24, the material properties include young 'S modulus, density, poisson' S ratio, damping.
9. The intensity simulation analysis method of claim 4, wherein: in step S25, a grid cell type and a grid size are specified, a finite element grid model is generated, and the speaker frame and the screws are of a free tetrahedron grid type.
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| CN201811137641.6A CN108959835B (en) | 2018-09-28 | 2018-09-28 | Intensity simulation analysis method of loudspeaker basin stand in screw installation process |
| PCT/CN2019/108363 WO2020063802A1 (en) | 2018-09-28 | 2019-09-27 | Simulation and analysis method for speaker basket strength during screw mounting |
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| CN201811137641.6A CN108959835B (en) | 2018-09-28 | 2018-09-28 | Intensity simulation analysis method of loudspeaker basin stand in screw installation process |
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| CN108959835B (en) * | 2018-09-28 | 2023-10-13 | 苏州上声电子股份有限公司 | Intensity simulation analysis method of loudspeaker basin stand in screw installation process |
| CN110610063A (en) * | 2019-10-21 | 2019-12-24 | 山东泰开高压开关有限公司 | Method for determining whether bolt type selection is correct |
| CN110889175B (en) * | 2019-11-05 | 2023-09-15 | 苏州上声电子股份有限公司 | Installation simulation analysis method of loudspeaker buckle |
| CN111814365A (en) * | 2020-05-26 | 2020-10-23 | 博雷顿科技有限公司 | Strength checking method for electric heavy truck uniform-section charging seat support |
| CN113705052B (en) * | 2021-08-30 | 2024-03-19 | 南京航空航天大学 | Rubber rotating shaft lip seal ring abrasion simulation method and system |
| CN114201816B (en) * | 2021-11-24 | 2024-04-23 | 华南理工大学 | Analysis method for vibration intensity of cold pipe in air inlet of automobile engine |
| CN114996868A (en) * | 2022-05-18 | 2022-09-02 | 中航沈飞民用飞机有限责任公司 | Pin seat strength analysis method |
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