CN118278245A - Design method of high-comfort earphone shell - Google Patents
Design method of high-comfort earphone shell Download PDFInfo
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- CN118278245A CN118278245A CN202410429739.8A CN202410429739A CN118278245A CN 118278245 A CN118278245 A CN 118278245A CN 202410429739 A CN202410429739 A CN 202410429739A CN 118278245 A CN118278245 A CN 118278245A
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- 238000013461 design Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000007639 printing Methods 0.000 claims abstract description 31
- 238000010146 3D printing Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 230000008021 deposition Effects 0.000 claims abstract description 3
- 238000004088 simulation Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 210000000845 cartilage Anatomy 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims description 3
- 210000001519 tissue Anatomy 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims 2
- 239000012467 final product Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000002474 experimental method Methods 0.000 abstract description 5
- 210000005069 ears Anatomy 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000000624 ear auricle Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Abstract
The invention discloses a design method of a high-comfort earphone shell. According to the invention, a three-dimensional model attached to the ear outline is constructed by using a three-dimensional scanner, geomagic Wrap and Magics software, the SolidWorks software is used for carrying out structural design of the shell, and ANSYS Workbench 21.0 is used for simulating stress and strain results under different shell structures. And designing a printing experiment by using an orthogonal experiment scheme to obtain the most suitable 3D printing parameters, printing by using a fused deposition manufacturing 3D printing technology, and assembling the acoustic part after printing to finish a final finished product. By applying the scheme of the invention, the earphone shell structure is designed, so that the earphone accords with the ergonomic design, the earphone can be better attached to the ears, the interference of external noise is reduced, the wearing comfort is improved, and the aim of customizing the earphone shell is fulfilled.
Description
Technical Field
The invention relates to a design method of a high-comfort earphone shell, and relates to the field of analog simulation and the field of additive manufacturing.
Background
Headphones are a portable device and are widely used in life, and their importance is represented by the ability to provide personalized, private and high quality audio experience, which is also an essential electronic device in this age. With the rapid development of science and technology and the continuous progress of human society, the living standard of people is gradually improved, and users pay more attention to the comfort and pleasure demands of products.
In recent years, analog simulation techniques have been applied to various fields. In the simulation experiment, the wearing comfort of the earphone can be objectively evaluated through the stress-strain cloud image distribution and the numerical value of the auricle-earphone.
Earlier in the introduction of FDM 3D printing technology, printing and molding of parts by using the FDM 3D printing technology is very wide.
Because the in-ear earphone is worn at the position of the auditory canal opening, the shape, the size and the depth of the auditory canal of a wearer are different, and for a mature earphone in the market, wearing comfort of different wearers is greatly different, so that wearing time, fitting sense and experience sense of the wearers can be greatly different. Therefore, a design method of the earphone which accords with human engineering and has high comfort needs to be studied.
Disclosure of Invention
The invention aims to provide a design method of a high-comfort earphone shell, which is used for reference before actual design and application and improves comfort.
In order to solve the technical problems, the technical scheme of the invention is realized as follows:
The embodiment of the application provides a design method of a high-comfort earphone shell. And scanning the auricle part of the human body by using a scanner to obtain a scanning information file with the outline of the auricle part of the human body, importing the obtained model into Geomagic Wrap software matched with the scanner to perform grid optimization, and storing the model as a file in STL format. And importing the obtained model file into Magics software. Firstly, a rectangular block model is made in Magics, rectangular block parts are moved to be fitted with the model of the ear outline and embedded, and meanwhile, two parts of the rectangular block and the ear outline are selected to carry out corresponding Boolean operation. And then eliminating, hole filling and optimizing to obtain a model file with smooth surface, and selecting and outputting the model file subjected to local optimization treatment to obtain the high-adaptation earphone shell model. And carrying out structural design on the number and the positions of sound outlets on the earphone shell model through SolidWorks modeling software, constructing earphone models under different conditions, and outputting files in an X_T format.
The simulation mode is to use ANSYS Workbench 21.0 software. After the model is introduced, parameter setting is carried out, the gravity of the earphone is set to be 0.04N, different directions of x, y and z exist, the whole structure of the earphone is set to be a skin-cartilage double structure, namely cartilage tissue with supporting function is arranged inside the earphone, skin tissue after equivalent treatment is arranged outside the earphone, contact friction is 0.45, and the fixed support is the earhole part equivalent to the auditory canal and displacement is 0. And importing each different model into software, respectively performing simulation, and calculating equivalent stress and equivalent strain under different models so as to estimate objective wearing comfort.
Analysis gave the most comfortable design, the printing mode was fused deposition manufacturing 3D printing (FDM), and the material was selected to be TPU filaments. Firstly, slicing the earphone shell model, setting the printing temperature to be 190-230 ℃, printing the layer thickness to be 0.1-0.3 mm, the printing speed to be 20-50 mm/s, filling paths of modes 0, 45 and 90 degrees, and adding necessary supports and skirts at the places where the model is needed. The slice file is stored in the SD memory card so that the printer performs identification printing.
After the earphone housing is printed, the acoustic parts are assembled.
The beneficial effects are that: compared with the existing earphone shell design form, the earphone shell has the following advantages:
(1) Customizing comfort. The 3D printing technology allows customizing the earphone housing according to the ear shape of each user, thereby providing personalized fit and comfort, reducing the sense of pressure of the ears, and improving the comfort of wearing for a long time.
(2) Chemo-acoustic properties. According to the invention, the ANSYS Workbench 21.0 simulation is selected, and the sound propagation path can be optimized by precisely controlling the internal structure and shape of the earphone shell, so that unnecessary reflection and diffraction are reduced, and the audio quality and the sound insulation effect are improved. Simulation experiment results show that the number of sound holes is 3, and the sound holes are the most comfortable earphone sound hole design method when the sound holes are surrounded along the edge of the earphone.
(3) The 3D printing method is used as a manufacturing mode of the earphone shell, so that the transition from rapid design to finished products is supported, meanwhile, the cost of small-batch production is reduced, and the material selection is more flexible.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a graph of performance parameters of TPU material;
FIG. 3 is a nine-group experimental set designed by orthogonal experiments;
fig. 4 is a finished view of the most comfortable case of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
The invention will be further illustrated and described in detail below with reference to the drawings and examples.
The invention provides an embodiment, which is a design method of a high-comfort earphone shell. As shown in fig. 1, the method for designing the earphone shell includes the following steps:
Step 1, obtaining an auricle initial model through a three-dimensional scanner, wherein scanned software is VXelements software, repairing and optimizing the three-dimensional model by using Geomagic Wrap software after scanning is completed, improving the concave and convex of the surface of the model, removing surface nails and supplementing defect parts; different sound hole structures are set by using SolidWorks modeling software, and earphone models with different sound hole structures are built.
And 2, carrying out mechanical simulation on the auricle-earphone model by using ANSYS Workbench 21.0 software.
Further, the finite element analysis of the whole structure contact part is subjected to independent region refinement meshing, and the region without direct contact part such as earlobe is subjected to common meshing so as to obtain a more accurate result of the contact region.
And 3, setting the same boundary condition, setting the gravity of the earphone to 0.04N, setting the whole structure of the earphone to be a skin-cartilage double structure, namely, setting the inside to be cartilage tissue with supporting function, setting the outside to be skin tissue after equivalent treatment, carrying out contact friction to 0.45, fixedly supporting to be equivalent earhole part of the auditory canal to be 0, and analyzing stress strain cloud pictures and numerical values under different earphone shell structures. The cloud picture has uniform size distribution and more comfortable wearing with the stress value of about 0.219 Mpa.
And 4, analyzing simulation results under different structural conditions, and further selecting a sound hole structure with high wearing comfort as a design method of a final finished product.
Step 5, as shown in FIG. 2, is a performance parameter diagram of the TPU material, and has a melt index of 1.2, a density of 1.21g/cm 3, a tensile strength of 35MPa and an elongation at break of more than or equal to 800%.
As shown in FIG. 3, according to the performance parameters in FIG. 2, the printing parameters are set to be the printing temperature of 190-230 ℃, the layer height of 0.1-0.3 mm, the printing speed of 20-50 mm/s, the filling modes of 0, 45 and 90 DEG paths, and the orthogonal experimental scheme of the printing experiment is made within the numerical range.
And 6, importing the model obtained by the simulation analysis into slicing software, and sequentially carrying out slicing treatment according to an orthogonal experimental scheme.
And 7, analyzing the result of the orthogonal experiment to obtain the most suitable printing mode, namely printing temperature of 230 ℃, printing layer thickness of 0.1mm, printing speed of 50mm/s, filling mode of 90-degree path, and adding a support and a skirt edge to the model. After setting the printing parameters, the printing file is stored in the SD memory card.
The printing mode is FDM 3D printing technology, and the selected material is TPU wire. The SD memory card is first inserted into the printer so that the printer performs identification printing. Before printing, leveling the equipment in situ, and then heating the spray nozzle to 230 ℃ to perform wire advancing operation and put TPU wires into the equipment. The platform temperature was set to 5 ℃, and the earphone housing model file to be printed was selected. After the molded part is printed, the printed earphone shell is assembled by parts.
As shown in fig. 4, is the final view of the most comfortable case designed by the present invention.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art may modify the technical solution described in the above embodiments, and these modifications or replace the technical solution of the present invention without departing from the scope of the present invention.
Claims (1)
1. The design method of the high-comfort earphone shell based on the simulation is characterized by comprising the following steps of:
(1) Scanning the outline of the human ear part by using a scanner, importing the obtained model file into Geomagic Wrap software, repairing the model and optimizing the grid to obtain a complete ear model with a smooth surface, and storing the model file in an STL format; then, a rectangular block model is made in Magics, rectangular block parts and an ear outline model are moved to be fitted and embedded, and two parts of a rectangular block and an ear outline are selected at the same time to carry out Boolean operation; then eliminating, hole filling and optimizing to obtain a model file with smooth surface, and selecting and outputting the model file subjected to local optimization treatment to obtain the high-adaptation earphone shell model;
(2) Leading the obtained earphone shell model into SolidWorks modeling software for structural design of the shell, setting the number of sound holes to be 3, distributing the sound holes in arc along the edge of the earphone shell, and storing the sound holes as X_T format files after the model structure is made;
(3) The model is guided into ANSYS Workbench 21.0 to carry out relevant parameter setting, including gravity, material parameters, contact friction, fixed support and displacement of the earphone; the gravity of the earphone is set to be 0.04N, the whole structure of the earphone is set to be a skin-cartilage double structure, namely cartilage tissue with supporting function is arranged inside, skin tissue after equivalent treatment is arranged outside, the contact friction is 0.45, the fixed support is an earhole part equivalent to an auditory canal, and the displacement is 0;
(4) Importing the model obtained by analysis into slicing software Simplify3D, slicing, setting printing parameters, and storing a printing file in an SD memory card; the material is thermoplastic polyurethane TPU, the printing parameters of the final product are set to be the printing temperature of 230 ℃, the printing layer thickness is 0.1mm, the printing speed is 50mm/s, and the filling mode is 90 DEG path
(5) Leveling the 3D printing equipment in situ, heating the spray head and the printing platform, printing the earphone shell, and assembling parts after the shell is printed; printing is performed by fused deposition manufacturing 3D printing techniques.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118278245A true CN118278245A (en) | 2024-07-02 |
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