CN110287641A - A kind of construction method of the manikin dressing system based on air bag simulation algorithm - Google Patents
A kind of construction method of the manikin dressing system based on air bag simulation algorithm Download PDFInfo
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- CN110287641A CN110287641A CN201910602686.4A CN201910602686A CN110287641A CN 110287641 A CN110287641 A CN 110287641A CN 201910602686 A CN201910602686 A CN 201910602686A CN 110287641 A CN110287641 A CN 110287641A
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- air bag
- volume
- manikin
- control
- pressure
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q30/00—Commerce
- G06Q30/06—Buying, selling or leasing transactions
- G06Q30/0601—Electronic shopping [e-shopping]
- G06Q30/0641—Shopping interfaces
- G06Q30/0643—Graphical representation of items or shoppers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
Abstract
The invention discloses a kind of construction methods of manikin dressing system based on air bag simulation algorithm, comprising the following steps: (1) with state equation, specific internal energy evolution equation and control volume calculate and establish one include air inlet air bag pressure-volume between relationship library；(2) one is established by 47 air bags and a bracket, and air bag is separately mounted to the human simulation model formed on bracket；(3) three-dimensional, the height information provided according to customer is inflated air bag, and manikin is realized and is restored in the posture of the 1:1 of different spaces；(4) selected clothes is through on the human simulation model after step (3) inflation, shoots picture, picture is sent to customer and is selected.The present invention relates to Simulation system technology fields, can solve customer in online purchase clothes, can not confirm the whether fit problem of bought clothes, are that one kind is safe and reliable, accuracy is high, the construction method of strong real-time manikin dressing system.
Description
Technical field:
The present invention relates to field of computer technology more particularly to a kind of manikin based on air bag simulation algorithm to fit and be
The construction method of system.
Background technique:
The foundation of manikin is based on human parameters, it can be used to accurate description mechanical characteristics and human figure
It is a kind of very important auxiliary tool that feature, which is research, analysis, design, test and evaluation human organism,.For example, customer is in net
When upper purchase clothes, the whether fit problem of bought clothes can not be confirmed, at this moment can simulate people by establishing manikin
The various forms of body buy suitable clothes for more convenient and quicker, but there is presently no good solutions.
There are many experts and scholars both at home and abroad to study application and foundation about manikin.Come according to purposes
Point, can be divided into the manikin of design, the manikin of operating attitude, analyze the various movements of human body manikin,
And the manikin etc. of matching man-machine interface.According to form point, manikin can be divided into physical model and Digital Simulation
Model etc..
Different methods has the advantages that different and disadvantage.Most start, the method that people are used to calculate air bag is analytic method, solution
The common feature of analysis method is to establish the equation of gas state based on thermodynamic (al) knowledge；And movement is established based on dynamic (dynamical) method
Kinetics equation finally solves the response of system by numerical integration operation again, so that the damping characteristics of air bag be calculated.Zhang Yuan
It is bright that the air bag simulated acid rain in unmanned plane removal process is carried out in conjunction with thermodynamical equilibrium equation from the direction that energy is converted
Research, the method for establishing a set of analytical analysis.Warm Jinpeng etc. considers the elasticity of airbag wall textile material, in conjunction with thermodynamics side
Journey analyzes the damping characteristics to fixed exhaust outlet Soft landing air bag, has studied exhaust outlet initial pressure, area and woven fabric elasticity
Influence to air bag damping characteristics.
In recent years, with the continuous development of computer simulation technique, since last century the eighties, in the base of analytic method
On plinth, the simulation algorithm of air bag has obtained biggish development, these algorithms mainly have: control volume mothod (CV method), particle method (C-
) and Arbitrary Lagrangian Euler method (ALE method) Method.Due to finite element method can preferably handle irregular-shaped objects,
Situations such as large deformation, therefore these simulation algorithms are calculated mostly by way of finite element simulation platform.Compared to parsing
Method, the air bag simulation calculation in conjunction with finite element is more flexible, and restrictive condition is less, can better solve the stream in air bag bring disaster upon admittedly conjunction ask
Topic.Various simulation calculation theories in relation to various air bags have rapid development.The development of air bag theory pushes in turn again
The application of air bag.
Control volume mothod: being also isostatic pressing, can be used for approximate calculation inside air bag pressure and changes with time, this method
The simplification of height has been carried out to intake airflow dynamics model, had many advantages, such as that modeling is easy, obtain solving that precision is high, calculating speed is fast.Press
The theoretical basis of method is the thermodynamical equilibrium equation of scalar, it can't carry out discretization modeling to fluid.Even if considering air-flow stream
Pressure change caused by entering and flowing out, but still be based on this uniform basic assumption of pressure.Although this is assumed very
Simply, but calculating is but very accurate, and can calculate mixed gas operating condition and the specific heat coefficient with time correlation.Isostatic pressing
It has been a kind of airbag deployment algorithm of mainstream till now, but its major defect is still worth noting: this side
Method has been done highly simplified to air bag flowing, especially has ignored the influence of local gas flow.But under normal circumstances, ignore office
Gas flowing in portion's can't make calculating error become very big.
Summary of the invention:
The purpose of the present invention is to provide a kind of construction method of manikin dressing system based on air bag simulation algorithm,
To solve for customer in online purchase clothes, the whether fit problem of bought clothes can not be confirmed.
The present invention is implemented by following technical solution: a kind of building of the manikin dressing system based on air bag simulation algorithm
Method, comprising the following steps:
(1) being calculated with state equation, specific internal energy evolution equation and control volume and established one includes air inlet air bag
Pressure-volume between relationship library；
(2) one is established by 47 air bags and a bracket, and air bag is separately mounted to the human emulation mould formed on bracket
Type；
(3) three-dimensional, the height information provided according to customer is inflated air bag, and manikin is realized in different spaces
1:1 posture reduction；
(4) selected clothes is through on the human simulation model after step (3) inflation, shoots picture, picture is sent to
Customer selects.
Preferably, the step (1) specifically: utilize the current air bag volume in each time step, being calculated
It is to be determined by control volume mothod, current to control pressure in the corresponding air bag of volume be then by by pressure and current gas density
It is determined with the state equation that gas internal energy connects, the state equation for air bag simulation is common Gamma method gas shape
State equation:
Ρ=(k-1) ρ e
P is the pressure in air bag in formula, and k is the constant being defined herein, and ρ is density, and e is gas internal energy, this state
Equation is derived from from the law of thermodynamics in adiabatic process of perfect gas.
Preferably, the control volume of the step (1) is defined as the volume for being closed curved surface package, for air bag
For emulation, determine that the Control curve of control volume size is the gas cell fabric material being made of air bag shell unit or film unit
In each material calculation, the surface area of current gas cell fabric unit composition is calculated simultaneously in curved surface made of material modeling
It is stored, the area and control volume of Control curve can be associated by green theorem:
The first two integral is the integral of the volume surrounded about a closed surface in formula, that last integral is about shape
At the curve surface integral of this closed volume, nxIt is the direction cosines between curved surface normal direction and the direction x；And so on, other two
Direction can also be write as the formula of similar form, φ and two arbitrary functions of ψ, the two functions only need to carry out volume point and face
Integral operation, the integrated form of air bag volume are as follows:
V=∫ ∫ ∫ dxdydz
Preferably, state equation and control volume pass through vacation when calculating the pressure of air inlet air bag is known to specific internal energy
If the variation of interior energy are as follows:Specific internal energy evolution equation, pass through state equation and control volume calculate establish
A complete relationship library possessed between pressure-volume of air inlet air bag out.
Preferably, the computer connection numerical control inflator pump for establishing the relationship library between air inlet bladder pressure-volume,
The numerical control inflation pump output terminal connects air bag.
Advantages of the present invention:
(1) use air bag can be with various human moulds such as the various forms, such as back, belly of simple and convenient simulation human body
Type can be restored accurately relatively；
(2) using control volume mothod (CV method) this method by highly simplified to intake airflow dynamics model, calculating easy with modeling
The advantages that speed is fast, solving precision is high；
(3) using the air bag for being filled with compressed air in rubber capsule flexible, businessman can easily control manikin
On each piece of muscle, allow the body of model that can more approach consumer；
(4) entire dummy frame compares good material using toughness, can simulate the various postures of people, be more easier to allow
Customer is by remotely seeing whether clothes is fit.
Detailed description of the invention:
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is flow chart of the invention；
Fig. 2 is the temperature coordinate curve that gas generator generates gas；
Fig. 3 is to be calculated to obtain gas according to pressure history after temperature in the specific heat W and container for determined mixed gas
Quality rate of inflow coordinate curve；
Fig. 4 is that gas pressure intensity changes over time coordinate curve in air bag；
Fig. 5 is 47 air bags and human muscle position corresponding diagram of human simulation model；
Fig. 6 is the preceding comparison diagram with after inflation of model inflation；
Fig. 7 is for model upper part of the body effect picture.
Specific embodiment:
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention provides a kind of construction method of manikin dressing system based on air bag simulation algorithm, specifically includes:
Establish the complete relationship library possessed between air inlet bladder pressure-volume.
In this embodiment, state equation, specific internal energy evolution equation and control volume calculate and establish a packet
Contain the relationship library between pressure-volume of air inlet air bag.Firstly, benefit is in each time step, what is be calculated is current
Air bag volume is determined by control volume mothod.In air bag corresponding with current control volume pressure be then by by pressure with work as
The state equation that preceding gas density and gas internal energy connect determines.State equation for air bag simulation is common
The Gamma method equation of gas state,
Ρ=(k-1) ρ e
P is the pressure in air bag in formula, and k is the constant being defined herein, and ρ is density, and e is gas internal energy.This state
Equation is derived from from the law of thermodynamics in adiabatic process of perfect gas.
Air bag can be considered as to a complete control volume when calculating air bag volume, this method is in aeration phase
Usability is strong and can significantly reduce calculation amount.Control volume is defined as the volume for being closed curved surface package.It is right
For air bag emulation, the Control curve of control volume size, the air bag being exactly made of shell unit or film unit are determined
Curved surface made of textile material modeling.In each material calculation, the song of current gas cell fabric unit composition can be calculated
Face area, and stored.When calculating control volume, so that it may these characteristics of Control curve unit are applied to wherein, this
It is exactly air bag volume.The area and control volume of Control curve can be associated by green theorem.
The first two integral is the integral (dv=dxdydz) of the volume surrounded about a closed surface in formula, it is last that
Integral is about the curve surface integral for forming this closed volume, nxIt is that curved surface normal direction and the direction x (determine) it according to the partial derivative of x
Between direction cosines；And so on, other both directions can also be write as the formula of similar form.φ and two arbitrary functions of ψ,
The two functions only need to carry out volume point and Line Integral operation.The integrated form of air bag volume can be written as:
V=∫ ∫ ∫ dxdydz
State equation and control volume are calculated when calculating pressure must be known to specific internal energy.By assuming that the variation of interior energy
For,Specific internal energy evolution equation, state equation and control volume calculating can completely set up out one and gather around
There is the complete relationship library between pressure-volume of air inlet air bag.
One is established by 47 air bags and the bracket of a material production with good toughness (by distance between every two model
For 10cm grouping, example 160-170,170-180 etc.), the Whole Body simulation model of composition.As shown in figure 5, being human emulation mould
47 air bags and human muscle position corresponding diagram of type, 47 air bags of human simulation model respectively correspond each position flesh of human body
Meat covers each position of whole body or more, therefore, completely close with human somatotype after 47 air bags are full of gas, can simulate
Real human body figure.Fig. 6 is the preceding comparison diagram with after inflation of model inflation, and Fig. 7 is for model upper part of the body effect picture.As it can be seen that filling
After gas, manikin can preferable simulation human somatotype.The three peacekeeping height informations that can be provided according to client, fill high short and stout out
The model of thin different building shape.Businessman can easily control the air bag of every piece of simulation muscle with human body, be provided according to customer
Parameter also can control the shape of muscle by the size of how much control air bags of control input gas, while bracket can also be with
Adjustment height, allows the human simulation model of customer to seem and has no indisposed sense.
Customer provides the three-dimensional of oneself, height, and businessman adjusts bracket, and is inflated to air bag, establishes air inlet air bag
The computer in the relationship library between pressure-volume connects numerical control inflator pump, and numerical control inflates pump output terminal and connects air bag.Work as air inlet
After complete relationship library between bladder pressure-volume establishes, businessman inputs three-dimensional, the height information that client provides, and calculates
Volume needed for eedle calculates the air bag of 47 reference numerals to the information of client, is then converted into pressure, by calculating
The inflationtime of inflator pump, aeration speed control bladder pressure, and to realize air bag volume finally by inflator pump this most terminates
The change of fruit.For example, certain the big waistline of client's belly is thick, corresponded on manikin the air bags of abdominal muscles with regard to inflationtime compared with
Long, remaining position principle is similar.
Manikin is adjusted to almost the same with consumer through the above way, realizes customer the 1 of different spaces:
1 posture reduction.After manikin establishes, clothes selected by customer is through on human simulation model by businessman, and adjusts difference
Posture, shoot picture from different perspectives, picture be sent to customer as reference and is selected, choose whether to be satisfied with.
The principle of the present invention is: utilizing a kind of the easily controllable of air bag that compressed air is filled in flexibly rubber capsule
Characteristic, the various figures of human body are accurately restored relatively.The wherein relationship between pressure-volume of air bag, using control
Volumetric method (CV method) Lai Jianli processed, control volume mothod (CV method) can't carry out discretization modeling, its theoretical basis to fluid
It is the thermodynamical equilibrium equation of scalar.Even if considering air-flow flows in and out caused pressure change, but still is equal based on pressure
This even basic assumption and come.Although this hypothesis is very simple, calculate very accurate, and can calculate and the time
Relevant specific heat coefficient and calculating mixed gas operating condition.Control volume mothod (CV method) has a quite obvious benefit just
It is that the time required for calculating than other methods is short very much, with the time phase for calculating airbag structure response with finite element algorithm
Than can be ignored.Parameter is flowed into, such as temperature change value and mass flow, is generally then needed true by test and other methods
Recognize.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of construction method of the manikin dressing system based on air bag simulation algorithm, which is characterized in that including following step
It is rapid:
(1) with state equation, specific internal energy evolution equation and control volume calculate and establish one include air inlet air bag pressure
Relationship library between by force-volume；
(2) one is established by 47 air bags and a bracket, and air bag is separately mounted to the human simulation model formed on bracket；
(3) three-dimensional, the height information provided according to customer is inflated air bag, and manikin is realized the 1 of different spaces:
1 posture reduction；
(4) selected clothes is through on the human simulation model after step (3) inflation, shoots picture, picture is sent to customer
It is selected.
2. a kind of construction method of manikin dressing system based on air bag simulation algorithm according to claim 1,
It is characterized in that, the step (1) specifically: using in each time step, the current air bag volume being calculated is by controlling
Volumetric method processed determines, current to control pressure in the corresponding air bag of volume be then by by pressure and current gas density and gas
The interior state equation that can be connected determines that the state equation for air bag simulation is the common Gamma method equation of gas state:
Ρ=(k-1) ρ e
P is the pressure in air bag in formula, and k is the constant being defined herein, and ρ is density, and e is gas internal energy, this state equation
It is to be derived from from the law of thermodynamics in adiabatic process of perfect gas.
3. a kind of construction method of manikin dressing system based on air bag simulation algorithm according to claim 1,
It is characterized in that, the control volume of the step (1) is defined as the volume for being closed curved surface package, for air bag emulation
Speech determines that the Control curve of control volume size is that the bag fabric material being made of air bag shell unit or film unit models
Made of curved surface, in each material calculation, the surface area of current gas cell fabric unit composition is calculated and is stored,
The area and control volume of Control curve can be associated by green theorem:
The first two integral is the integral of the volume surrounded about a closed surface in formula, that last integral is about forming this
The curve surface integral of a closed volume, nxIt is the direction cosines between curved surface normal direction and the direction x；And so on, other both directions
It can also be write as the formula of similar form, φ and two arbitrary functions of ψ, the two functions only need to carry out volume point and Line Integral
Operation, the integrated form of air bag volume are as follows:
V=∫ ∫ ∫ dxdydz
4. a kind of construction method of manikin dressing system based on air bag simulation algorithm according to claim 1,
Be characterized in that: state equation and control volume are when calculating the pressure of air inlet air bag is known to specific internal energy, by assuming that interior energy
Variation are as follows:Specific internal energy evolution equation, by state equation and control volume calculating establish out one
Possess the complete relationship library between pressure-volume of air inlet air bag.
5. a kind of construction method of manikin dressing system based on air bag simulation algorithm according to claim 1,
It is characterized in that: the computer connection numerical control inflator pump for establishing the relationship library between air inlet bladder pressure-volume, the number
Control inflation pump output terminal connects air bag.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11867581B1 (en) * | 2020-11-12 | 2024-01-09 | Ansys, Inc. | Methods and systems for modeling trapped air in honeycomb based crash barriers |
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