CN108897930A - A method of the contact stress between prediction human body and mattress - Google Patents
A method of the contact stress between prediction human body and mattress Download PDFInfo
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- 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]
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Abstract
The invention discloses a kind of methods of the contact stress between prediction human body and mattress, the contact stress of human body and Palm fibre mattress are predicted and analyzed by the method for combining 3-D scanning technology and FInite Element, steps are as follows：Compression test is carried out to the material of mattress, obtains the mechanics parameter of mattress material；Use feeling answers camera Kinect, is respectively placed on four columns, tester stands in scanning range, and both arms is kept to part a little, it can scan to obtain the point cloud of human body surface, the manikin that scanning obtains is handled with Geomagic Studio, obtains the physical model of subject；The manikin of acquisition is imported into Grid Generation Software, the material parameter of input mattress, human skin and muscle predicts the contact stress between human body and mattress.Different people can be suitble to the mattress of oneself according to the pressure distribution situation selection on the mattress of different materials, to effectively reduce back pain, improve sleep quality.
Description
Technical field
The present invention relates to stress prediction technical fields, and in particular to a kind of side for predicting the contact stress between human body and mattress
Method.
Background technique
Application of the Pressure Distribution Measuring System (Tactilus) in the measurement of mattress comfort level.Pass through the survey being distributed to pressure
The assessment of result is measured, system can help designer or manufacturer to optimize the selection of material,
The Pressure Distribution Measuring System uses pressure-sensitive paper or unique piezoelectric pressure indicator, can be to any contact surface
Between pressure distribution and pressure size carry out static and dynamic and measure, and it is aobvious with intuitive, vivid two dimension, three-dimensional colour figure
To show the profile and numerical value of pressure distribution, and then makes assessment, the measurement of pressure distribution becomes the most important condition solved these problems,
And solve the problems, such as that the method for pressure measurement is exactly the experiment carried out using system repeatedly, not only low efficiency, and cost in this way
It is relatively high.
In conclusion how to provide a kind of method for predicting the contact stress between human body and mattress, improves measurement accuracy and want
It asks, is those skilled in the art's urgent problem to be solved.
Summary of the invention
The purpose of the present invention is to solve drawbacks described above in the prior art, provide between a kind of prediction human body and mattress
The method of contact stress.
The purpose of the present invention can be reached by adopting the following technical scheme that：
A method of the contact stress between prediction human body and mattress, the method include the following steps：
S1, compression test is carried out to the material of mattress, obtains the mechanics parameter of mattress material；
S2, use feeling answer camera Kinect to scan to obtain the point cloud of human body surface；
The manikin that S3, scanning obtain carries out reverse process with Geomagic Studio, obtains the human mould of subject
Type；
S4, the manikin of acquisition is imported into Grid Generation Software ANSYS Workbench, in Engineering Data
The material parameter of middle input mattress, human skin and human muscle, predicts the contact stress between human body and mattress.
Further, compression test is carried out to the material of Palm fibre mattress in the step S1, obtains Palm fibre mattress material
Mechanics parameter, wherein the size of Arenga engleri Beccari test block is set as 1900m × 810mm × 60mm, and the density of Palm fibre mattress is
117.9kg/m3, elasticity modulus 46.7kPa.
Further, in the step S2, induction camera Kinect is placed on three or more columns respectively, often
There are three induction camera Kinect for being respectively placed in different height on a column, the tester for only wearing underwear stands on
In scanning range, and both arms is kept to part a little, posture is remained stationary greater than 7s.
Further, in the step S4, the material parameter and element characteristics of human muscle is defined as follows：
Human muscle uses Mooney-Rivlin hyperelastic model, using Patch Conforming Method by human body
Muscle is divided into four node tetrahedral solid elements,
The strain energy function of Mooney-Rivlin model is expressed as：
W=A1(J1-3)+A2(J2-3)+A3(J3 -2-1)+A4(J3-1)2 (1)
In formula, J1,J2,J3It is the Cauchy-Green invariant of strain tensor；
The Cauchy-Green invariant of strain tensor is expressed as：
C=FT·F (2)
In formula, F indicates Deformation tensor
J1=trace (C) (3)
J3=det (C) (5)
Strain energy function obtains the 2nd Piola-Kirchhoff to the differential of the Cauchy-Green invariant of strain tensor
Stress tensor is expressed as follows：
Material parameter A1,A2,A3,A4It is as follows：
A1=1.65kPa
A2=3.35kPa
A3=(1/2) A1+A2
A4={ A1(5v-2)+A2(11v-5)}/2(1-2v)
V=0.49.
In formula, v indicates Poisson's ratio.
Further, in the step S4, the material parameter and element characteristics of human skin are defined as follows：
Human skin uses linear elasticity isotropic model, and using three node triangle shell units, said units are a kind of
Triangular element with bending ability, skin thickness take 2mm, and Young's modulus takes 150kPa, Poisson's ratio 0.46.
Further, in the step S4, the element characteristics and element characteristics of the material parameter of mattress are defined as follows：
It is modeled according to the actual material parameter of mattress material that experiment obtains, it will using the method for automatic division unit
It is divided into hexahedral element.
Further, in the step S4, such as to the solution procedure of human body and mattress in ANSYS Workbench
Under：
S401, entire human skin surface and human muscular tissue surface setting Bonded are contacted, the setting of the face Contact
For muscle tissue surface, the face Target is set as entire skin surface, and Contact Algorithm uses Augmented Largrange, right
Frictional is arranged in the contact method of skin and mattress, and coefficient of friction is set as the upper surface that the face 0.4, Contact is mattress,
The face Target is back skin surface, is iterated operation using Each iteration, uses Add Offset.No
Ramping makes contact complete to load in the first sub-steps；
S402, loading method are motionless using mattress base, i.e., by mattress bottom fixed constraint, apply on manikin
Gravity opens large deformation Large Deflection switch, and load step is defined by sub-step number, and initial step length is defined as 30,
Minimum step is defined as 5, and maximum step-length is defined as 100, is finally solved.
The present invention has the following advantages and effects with respect to the prior art：
1), the human body that this prediction technique obtains and the contact stress and Pressure Distribution Measuring System Tactilus phase between mattress
Than mean stress, maximum stress value are very close and Pearson correlation coefficient is strong correlation, therefore can effectively save into
This, promotes the development of private customization mattress.
2), method of the present invention by combining 3-D scanning technology and FInite Element, effectively predicts and analyzes people
The contact stress of body and Palm fibre mattress, different people can be suitble to according to the pressure distribution situation selection on the mattress of different materials
The mattress of oneself improves sleep quality to effectively reduce back pain.
3), the present invention has stronger innovative and important industrial value and application prospect, not only meets difference
Pursuit of the consumer for mattress quality promote the development of the personalized designs of mattress also under the premise of protecting environment,
So that mattress is bonded human body lumbar vertebrae, cervical vertebra and thoracic vertebrae completely, to improve mattress to the support performance of human body, improves sleep matter
Amount.
Detailed description of the invention
Fig. 1 is human body 3D scanning manikin schematic diagram；
Fig. 2 is by the manikin schematic diagram after the completion of reverse process；
Fig. 3 is the FEM model schematic diagram of human body and mattress；
Fig. 4 is pressure distribution test schematic diagram；
Fig. 5 is the contact stress schematic diagram between mattress that finite element modelling obtains；
Fig. 6 is a kind of process step figure of the method for the contact stress between prediction human body and mattress disclosed by the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment one
Flow chart as shown in Fig. 6, the present embodiment provides the contact stress between a kind of prediction human body and Palm fibre mattress
Method can predict that human body is whole in the pressure distribution of mattress contact site.The present invention is generated using only Kinect camera
Three-dimensional (3 D) manikin, Kinect camera will not be as Computed Tomograph (CT) or magnetic resonance imaging Magnetic
Resonance Imaging (MRI) equally brings the danger of radiation to subject, compared to more practical and efficient.
The present invention proposes a kind of method for predicting the contact stress between human body and Palm fibre mattress, includes the following steps：
S1, compression test is carried out to the material of Palm fibre mattress, obtains the mechanics parameter of Palm fibre mattress material.
In step S1, the size of Arenga engleri Beccari test block is set as 1900m × 810mm × 60mm, and compression experiment can obtain, Palm fibre mattress
Density be 117.9kg/m3, elasticity modulus 46.7kPa.
S2, use feeling answer camera Kinect (Microsoft Corp., Seattle, WA, USA) scanning to obtain human body table
The point cloud in face.
In step S2, induction camera Kinect is placed on three or more columns respectively, is had on each column point
It is not placed in three Kinect of different height, the tester for only wearing underwear stands in scanning range, and keeps both arms micro-
, posture is remained stationary greater than 7s.
The manikin that S3, scanning obtain carries out reverse process with Geomagic Studio, obtains the human mould of subject
Type.
S4, the manikin of acquisition is imported into Grid Generation Software (ANSYS Workbench Inc., ver.15.0),
The material parameter that mattress, human skin and human muscle are inputted in Engineering Data, between the contact human body and mattress
Stress is predicted.
In step S4, the material parameter and element characteristics of human muscle is defined as follows：
Human muscle uses Mooney-Rivlin hyperelastic model, using Patch Conforming Method by human body
Muscle is divided into four node tetrahedral solid elements.
The strain energy function of Mooney-Rivlin model is expressed as：
W=A1(J1-3)+A2(J2-3)+A3(J3 -2-1)+A4(J3-1)2 (1)
In formula, J1,J2,J3It is the Cauchy-Green invariant of strain tensor.
The Cauchy-Green invariant of strain tensor is expressed as：
C=FT·F (2)
In formula, F indicates Deformation tensor
J1=trace (C) (3)
J3=det (C) (5)
Strain energy function obtains the 2nd Piola-Kirchhoff to the differential of the Cauchy-Green invariant of strain tensor
Stress tensor is expressed as follows：
Material parameter A1,A2,A3,A4It is as follows：
A1=1.65kPa
A2=3.35kPa
A3=(1/2) A1+A2
A4={ A1(5v-2)+A2(11v-5)}/2(1-2v)
V=0.49
In formula, v indicates Poisson's ratio.
In step S4, the material parameter and element characteristics of human skin are defined as follows：
Human skin uses linear elasticity isotropic model, and human skin is defined as 2mm, using three node triangle shell lists
First (three-node triangular shell elements), this unit is a kind of triangle list with bending ability
Member, skin thickness take 2mm, and Young's modulus takes 150kPa, Poisson's ratio 0.46.
In step S4, the element characteristics and element characteristics of the material parameter of mattress are defined as follows：
It is modeled according to the actual material parameter of mattress material that experiment obtains, it will using the method for automatic division unit
It is divided into hexahedral element.
It is as follows to the solution procedure of human body and Palm fibre mattress in ANSYS Workbench in step S4：
1) entire human skin surface and human muscular tissue surface setting Bonded are contacted, and the face Contact is muscle groups
Surface is knitted, the face Target is entire skin surface, and Contact Algorithm uses Augmented Largrange.To skin and mattress
Frictional, coefficient of friction 0.4 is arranged in contact method, and the face Contact is the upper surface of mattress, and the face Target is back skin
Skin surface, since mattress and human body are all more soft, contact stiffness should be turned down as far as possible in practical situations, use Each
Iteration is iterated operation, using Add Offset.No Ramping, contact is made to complete load in first sub-step
2) loading method is motionless using mattress base, i.e., by mattress bottom fixed constraint, applies weight on manikin
Power.Large deformation (Large Deflection) switch is opened, load step is defined by sub-step number, and initial step length is defined as 30,
Minimum step is defined as 5, and maximum step-length is defined as 100, is finally solved.
Embodiment two
The present embodiment discloses a kind of Finite Element Method for predicting the contact stress between human body and mattress, and specific steps are such as
Under：
Firstly, carrying out a large amount of compression experiments to Arenga engleri Beccari material to measure the mechanical property of Palm fibre mattress, experiment is obtained
Stress-strain data carries out linear fit, obtains its mechanical constant.
Secondly, lying supine upon the body pressure on Palm fibre mattress with the selected human body of Pressure Distribution Measuring System Tactilus measurement
Distribution, the body for obtaining selected human body press data.
Again, 3-D scanning is carried out to selected human body and obtains human external profile, be a cloud number due to scanning obtain
According to being handled with reverse software Geomagic Studio body scanning data, obtain the physical model of human body.
Finally, obtained human body physical model and Arenga engleri Beccari material parameter are imported in finite element software, establish by skin and
The manikin that musculature is constituted is predicted the contact pressure between manikin and mattress, and is proposed using Pearson came system
Number carrys out the degree of correlation of comparative experiments value and the analogue value.Consider that people-bed system geometrical non-linearity, material nonlinearity and contact are non-thread
Property, simulate the contact stress of the material model of a variety of human bodies and mattress in varied situations, the various simulation feelings of comparative analysis
The changing rule and influence factor of Max.contact stress, mean stress value under condition and the degree of correlation.
The result shows that human skin uses super-elasticity Mooney-Rivlin model using linear elastic model, musculature
Simulation result and experimental result are coincide preferable；Musculature can accurately more simulate people than linear elastic model using hyperelastic model
Contact stress when body is lain on the back；Establish the contact that the manikin of skin is simulated than not establishing the manikin of skin
Stress is closer to actual human body pressure distribution；In finite element modelling, mattress density and human skin thickness are in a certain range
The influence changed to contact pressure distribution situation is smaller.
The human body that this prediction technique obtains compared with contact stress and Pressure Distribution Measuring System Tactilus between mattress,
Mean stress, maximum stress value are very close and Pearson correlation coefficient is strong correlation, and Finite Element Method need to only obtain people
The material parameter of body Model and mattress, it will be able to predict the contact stress between human body and mattress, therefore, this prediction technique well
The finite element modeling and calculation method of proposition provide foundation to optimize the design of mattress, pass through the measurement result being distributed to pressure
Assessment, designer or manufacturer can be helped to optimize the selection of material, there is certain reality for the private customization of mattress
Meaning.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (7)
1. a kind of method of the contact stress between prediction human body and mattress, which is characterized in that the method includes the following steps：
S1, compression test is carried out to the material of mattress, obtains the mechanics parameter of mattress material；
S2, use feeling answer camera Kinect to scan to obtain the point cloud of human body surface；
The manikin that S3, scanning obtain carries out reverse process with Geomagic Studio, obtains the manikin of subject；
S4, the manikin of acquisition is imported into Grid Generation Software ANSYS Workbench, it is defeated in Engineering Data
Enter mattress, human skin and the material parameter of human muscle, the contact stress between human body and mattress is predicted.
2. the method for the contact stress between a kind of prediction human body according to claim 1 and mattress, which is characterized in that described
Step S1 in compression test is carried out to the material of Palm fibre mattress, obtain the mechanics parameter of Palm fibre mattress material, wherein Arenga engleri Beccari examination
The size of block is set as 1900m × 810mm × 60mm, and the density of Palm fibre mattress is 117.9kg/m3, elasticity modulus is
46.7kPa。
3. the method for the contact stress between a kind of prediction human body according to claim 1 and mattress, which is characterized in that described
Step S2 in, respectively will induction camera Kinect be placed on three or more columns, have on each column and place respectively
In three induction camera Kinect of different height, the tester for only wearing underwear is stood in scanning range, and keeps double
Arm parts a little, and posture is remained stationary greater than 7s.
4. the method for the contact stress between a kind of prediction human body according to claim 1 and mattress, which is characterized in that described
Step S4 in, the material parameter and element characteristics of human muscle is defined as follows：
Human muscle uses Mooney-Rivlin hyperelastic model, using Patch Conforming Method by human muscle
Four node tetrahedral solid elements are divided into,
The strain energy function of Mooney-Rivlin model is expressed as：
W=A1(J1-3)+A2(J2-3)+A3(J3 -2-1)+A4(J3-1)2 (1)
In formula, J1,J2,J3It is the Cauchy-Green invariant of strain tensor；
The Cauchy-Green invariant of strain tensor is expressed as：
C=FT·F (2)
In formula, F indicates Deformation tensor
J1=trace (C) (3)
J3=det (C) (5)
Strain energy function obtains the 2nd Piola-Kirchhoff stress to the differential of the Cauchy-Green invariant of strain tensor
Tensor is expressed as follows：
Material parameter A1,A2,A3,A4It is as follows：
A1=1.65kPa
A2=3.35kPa
A3=(1/2) A1+A2
A4={ A1(5v-2)+A2(11v-5)}/2(1-2v)
V=0.49.
In formula, v indicates Poisson's ratio.
5. the method for the contact stress between a kind of prediction human body according to claim 1 and mattress, which is characterized in that described
Step S4 in, the material parameter and element characteristics of human skin are defined as follows：
Human skin uses linear elasticity isotropic model, and using three node triangle shell units, said units are that one kind has
The triangular element of bending ability, skin thickness take 2mm, and Young's modulus takes 150kPa, Poisson's ratio 0.46.
6. the method for the contact stress between a kind of prediction human body according to claim 1 and mattress, which is characterized in that described
Step S4 in, the element characteristics and element characteristics of the material parameter of mattress are defined as follows：
It is modeled according to the actual material parameter of mattress material that experiment obtains, using the method for automatic division unit by its stroke
It is divided into hexahedral element.
7. the method for the contact stress between a kind of prediction human body according to claim 1 and mattress, which is characterized in that described
Step S4 in, it is as follows to the solution procedure of human body and mattress in ANSYS Workbench：
S401, entire human skin surface and human muscular tissue surface setting Bonded are contacted, the face Contact is set as flesh
Meat tissue surface, the face Target are set as entire skin surface, and Contact Algorithm uses Augmented Largrange, to skin
Frictional is set with the contact method of mattress, coefficient of friction is set as the upper surface that the face 0.4, Contact is mattress,
The face Target is back skin surface, is iterated operation using Each iteration, uses Add Offset.No
Ramping makes contact complete to load in the first sub-steps；
S402, loading method are motionless using mattress base, i.e., by mattress bottom fixed constraint, apply weight on manikin
Power opens large deformation Large Deflection switch, and load step is defined by sub-step number, and initial step length is defined as 30, most
Small step-length is defined as 5, and maximum step-length is defined as 100, is finally solved.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110826256A (en) * | 2019-11-29 | 2020-02-21 | 贵州大自然科技股份有限公司 | Design method of lightweight three-layer structure of palm mattress |
| CN110991113A (en) * | 2019-11-29 | 2020-04-10 | 贵州大自然科技股份有限公司 | Design method of lightweight double-layer structure of palm mattress |
| CN110991035A (en) * | 2019-11-29 | 2020-04-10 | 贵州大自然科技股份有限公司 | Design method of lightweight structure of palm mattress |
| CN110990970A (en) * | 2019-11-29 | 2020-04-10 | 贵州大自然科技股份有限公司 | Design and detection method of lightweight structure of palm mattress |
| CN112315257A (en) * | 2020-11-03 | 2021-02-05 | 广东珞珈睡眠科技有限公司 | Mattress system based on optimal transmission |
| CN112353168A (en) * | 2020-12-09 | 2021-02-12 | 江苏卧尔康家居用品有限公司 | Intelligent voice-control electric mattress |
| CN112417735A (en) * | 2020-12-01 | 2021-02-26 | 北京信息科技大学 | Finite element analysis method and system for fingertip skin surface contact characteristics |
| CN113033050A (en) * | 2021-03-23 | 2021-06-25 | 上海工程技术大学 | Reliability evaluation method for dressing test data of intelligent clothing flexible pressure sensor |
| WO2022003103A1 (en) * | 2020-07-01 | 2022-01-06 | Motesque GmbH & Co. KG | Method and device for identifying a cushion element from a quantity of different cushion elements |
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| CN110991113B (en) * | 2019-11-29 | 2023-03-31 | 大自然科技股份有限公司 | Design method of lightweight double-layer structure of palm mattress |
| CN110991113A (en) * | 2019-11-29 | 2020-04-10 | 贵州大自然科技股份有限公司 | Design method of lightweight double-layer structure of palm mattress |
| CN110991035A (en) * | 2019-11-29 | 2020-04-10 | 贵州大自然科技股份有限公司 | Design method of lightweight structure of palm mattress |
| CN110990970A (en) * | 2019-11-29 | 2020-04-10 | 贵州大自然科技股份有限公司 | Design and detection method of lightweight structure of palm mattress |
| CN110826256A (en) * | 2019-11-29 | 2020-02-21 | 贵州大自然科技股份有限公司 | Design method of lightweight three-layer structure of palm mattress |
| CN110991035B (en) * | 2019-11-29 | 2023-05-05 | 大自然科技股份有限公司 | Design method of palm mattress lightweight structure |
| WO2022003103A1 (en) * | 2020-07-01 | 2022-01-06 | Motesque GmbH & Co. KG | Method and device for identifying a cushion element from a quantity of different cushion elements |
| CN112315257A (en) * | 2020-11-03 | 2021-02-05 | 广东珞珈睡眠科技有限公司 | Mattress system based on optimal transmission |
| CN112315257B (en) * | 2020-11-03 | 2023-04-07 | 广东珞珈睡眠科技有限公司 | Mattress system based on optimal transmission |
| CN112417735A (en) * | 2020-12-01 | 2021-02-26 | 北京信息科技大学 | Finite element analysis method and system for fingertip skin surface contact characteristics |
| CN112417735B (en) * | 2020-12-01 | 2023-06-02 | 北京信息科技大学 | Finite element analysis method and system for contact characteristics of fingertip skin surface |
| CN112353168A (en) * | 2020-12-09 | 2021-02-12 | 江苏卧尔康家居用品有限公司 | Intelligent voice-control electric mattress |
| CN113033050A (en) * | 2021-03-23 | 2021-06-25 | 上海工程技术大学 | Reliability evaluation method for dressing test data of intelligent clothing flexible pressure sensor |
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