CN107798193A - Dummy breast simplified model design method under operating mode is touched in one kind biasing - Google Patents
Dummy breast simplified model design method under operating mode is touched in one kind biasing Download PDFInfo
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- CN107798193A CN107798193A CN201711029273.9A CN201711029273A CN107798193A CN 107798193 A CN107798193 A CN 107798193A CN 201711029273 A CN201711029273 A CN 201711029273A CN 107798193 A CN107798193 A CN 107798193A
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- 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 provides one kind biasing to touch dummy breast simplified model design method under operating mode, belongs to automotive crash safety field.This method includes：1. mechanic equivalentization processing belongs to soft tissue in the rib and thoracic cavity of the main endergonic structure of human chest.2. simplify processing two kinds of non-key structures of human spine and integumentary musculature outline.3. establish human chest complete structure.Spring structure is added, establishes annexation between above structure.4. establish human chest finite element initial model.Cell discretization processing is carried out to above-mentioned human chest complete structure.Material properties are assigned, human chest finite element initial model under operating mode is touched in generation biasing.5. chest FEM model optimizes.Based on Optimal Structure Theory, human chest optimization agent model is established, biasing is finally completed and touches dummy breast simplified model under operating mode.The method has filled up biasing and has touched dummy's design field blank, and further fast and effective reference is provided for constrained system optimization.
Description
Technical field
The present invention relates to one kind biasing to touch dummy breast simplified model design method under operating mode, belongs to automotive crash safety neck
Domain.
Background technology
Generation of the human thorax injury tolerance in vehicle traffic accident is very universal, and research shows in vehicle traffic accident mesothorax
Abdominal injury incidence is higher than 45%, is only second to craniocerebral injury.According to concise wound Scaling Standards (abbreviated injury
Scale, AIS), thoracic injury 1~2 grade of AIS in all damages accounts for 3~6 grades of 12%, AIS and accounts for 29%, be cause death with
One of the main reason for disability.Fracture of rib is most common thoracic injury type.Human chest is complicated, and inside contains
The important internal organs such as the heart, lung, liver,spleen,kidney, and torso model then plays the key effect for protecting these vitals.
The content of the invention
The purpose of the present invention is lifting vehicle safety performance analysis efficiency, solves two kinds of extreme collision works of central collision and side impact
Dummy breast structure has differences problem under condition.A kind of biasing is provided and touches dummy breast simplified model design method under operating mode, should
Method can be used for the lower vehicle safety performance research of any angle collision, while calculating is time-consuming few, and analysis efficiency is high.
Its technical scheme is：
Propose a kind of biasing and touch dummy breast simplified model design method under operating mode, it is characterised in that methods described bag
Include：
(1), the mechanic equivalentization processing main endergonic structure of human chest；
Operating mode is touched according to automobile biasing, with a Curved Beam Structure equivalent simulation human body rib in impact direction plane
Structure, rib size use human chest intermediate frame size.Soft group is simulated in torso model with mass in an equal set
Lumped mass is knitted, mass is located at torso model geometric center.
(2), the non-key structure simplification processing of human chest；
According to non-key endergonic structure feature in human chest structure in automobile collision procedure.It is firm using prismatic rectangle
Harden structure simplifies simulation human spine structure.Using medical image processing technology, simplify simulation human body skin from elastomeric material
Muscle outline construction geometry structure.
(3) human chest complete structure, is established；
Connection is established between rib, backbone, lumped mass block, framing system is articulated with spine structure, according to stress feelings
Condition, mass and rib non-percussion side, mass and and spine structure between stretching be respectively adopted connect with reversing cluster spring
Connect.Arrange that an extension spring (being θ with human body front angle) establishes the connection of rib and mass on impact direction.
(4) human chest finite element initial model, is established；
With CAE analysis software, unit ionization processing is carried out to above-mentioned human chest complete structure.Assign chest construction
Material properties, conditions setting etc..Operating mode human chest finite element initial model is touched in generation biasing.
(5), chest FEM model optimizes；
(5.1), using dummy's central collision and side impact rating test as analysis operating mode, it is flat to build the optimization analysis of chest initial model
Platform；
(5.2), based on response phase method, using dummy's central collision and side impact rating test as constraints, with curved beam, spring structure
Parameter is design variable, using the shifting of the dummy breast rating test middle rib position of bone, pendulum force regulation index as optimization aim, establishes occupant
Structure optimization agent model is touched in chest biasing；
(5.3) optimized algorithm, is chosen, solves above multi-objective optimization question, dummy breast letter under operating mode is touched in generation biasing
Change model.
2. dummy breast simplified model design method under operating mode, its feature are touched in a kind of biasing according to claim 1
It is：Step (4) establishes human chest finite element initial model, and assigning chest construction material properties includes：
(2.1) beam element attribute assignment, is carried out to the framing system of equivalentization；
(2.2) shell unit attribute assignment, is carried out to soft tissue structures such as the skin of chest muscle of foundation；
(2.3) body unit attribute assignment, is carried out to the spine structure of equivalentization；
(2.4), by thoracic cavity institutional framework mass concentration at torso model geometric center, matter is concentrated to thoracic cavity
Gauge block carries out body unit attribute assignment；
(2.5) spring unit attribute assignment, is carried out to spring structure on frame section surface；
3. dummy breast simplified model design method under operating mode, its feature are touched in a kind of biasing according to claim 1
It is：On the impact direction being related in step (3) described structure extension spring and human body front angle theta span be 0 °~
90°。
4. a kind of biasing as claimed in any of claims 1 to 3 is touched dummy breast simplified model under operating mode and set
Meter method, it is characterised in that：Step also includes：
Occupant's chest FEM model is initialized, framing system force-displacement curve and force-velocity curve is inputted, is assigned to
Beam element, wherein force-displacement curve and force-velocity curve touch experiment, reason by impact simulation emulation experiment or the biasing of occupant's chest
Obtained by derivation mode, so as to obtain rib acceleration and the distribution of breast compressions amount.
Beneficial effects of the present invention are：Thought of the invention based on mechanic equivalent proposes a kind of biasing and touches dummy under operating mode
Chest simplified model design method.Based on driver's chest rib deformation mechanism and variant in traffic accident, introduce beam and
A series of cluster springs carry out legal equivalents simplification to chest rib, skin, backbone and body structures, are meeting chest mould
Under the premise of the dynamic response of type, computational efficiency is effectively increased, greatly reduces and calculates the time.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the present invention；
Fig. 2 is driver's chest rib simplified model schematic cross-section；
Fig. 3 is driver's chest rib simplified model entirety front schematic view；
Fig. 4 is cluster spring schematic diagram
Mark explanation：1 --- backbone, 2 --- rib, 3 --- skin and muscular soft tissues, 4 --- cluster spring,
5 --- extension spring, 6 --- lumped mass block
Embodiment
The invention will be further described with reference to the accompanying drawings and detailed description.
(1), the mechanic equivalentization processing main endergonic structure of human chest；
Operating mode is touched according to automobile biasing, with a Curved Beam Structure equivalent simulation human body rib in impact direction plane
Structure, rib size use human chest intermediate frame size.Soft group is simulated in torso model with mass in an equal set
Lumped mass is knitted, mass is located at torso model geometric center, and specific layout is as shown in Figure 1 and Figure 2.
(2), the non-key structure simplification processing of human chest；
According to non-key endergonic structure feature in human chest structure in automobile collision procedure.It is firm using prismatic rectangle
Harden structure simplifies simulation human spine structure, plate size 40mm*20mm*300mm.Using medical image processing technology, choosing
Simplify simulation human body skin muscle outline construction geometry structure with elastomeric material, as shown in Figure 1.
(3) human chest complete structure, is established；
Connection is established between rib, backbone, lumped mass block, framing system is articulated with spine structure, according to stress feelings
Condition, mass and rib non-percussion side, mass and and spine structure between stretching be respectively adopted connect with reversing cluster spring
Connect.Arrange that an extension spring (being θ with human body front angle) establishes the connection of rib and mass on impact direction.These
Cluster spring is combined by drawing-pressing spring and torsionspring, using two-dimentional spring unit simulated interior structure organization and rib it
Between interaction.Spring unit both ends are connected with mass concentration block and rib (beam) cell node and use conode to connect respectively
Connect, such as Fig. 2.Collide specific operating mode and point to mass central point for oblique impact active force, be θ with human body front angle, and angle model
Enclose 15 ＜ θ ＜ 75 (thinking central collision occurs as θ=＜ 15, think side impact occurs as θ ＞=75).It might as well be pointed to active force
Exemplified by the right side of central point, symmetrical structure is then used when active force points to central point left side.
(4) human chest finite element initial model, is established；
With CAE analysis software, unit ionization processing is carried out to above-mentioned human chest complete structure.Assign chest construction
Material properties, conditions setting etc..Operating mode human chest finite element initial model is touched in generation biasing.Select LS-DYNA materials
No. 119 nonlinear spring beam materials in storehouse are simulated to the framing system of equivalentization, while carry out beam element attribute assignment, are selected
No. 20 rigid materials in LS-DYNA material depots are simulated to thoracic cavity lumped mass block, and carry out body unit attribute tax
Value, No. 20 rigid materials in LS-DYNA material depots are selected to carry out shell unit attribute assignment to the spine structure of equivalentization, to building
Vertical skin of chest muscular soft tissues structure carries out shell unit attribute assignment, selects SDMAT4 in LS-DYNA material depots non-linear
Material is simulated to spring on frame section surface in thoracic cavity, and carries out spring unit attribute assignment, all springs at grade, such as
Shown in Fig. 3.
(5), chest FEM model optimizes；
Using dummy's central collision and side impact rating test as analysis operating mode, based on response phase method, demarcated with dummy's central collision and side impact
Test as constraints, using curved beam, spring structure parameter as design variable, moved with the dummy breast rating test middle rib position of bone, pendulum
It is optimization aim to hammer force method rule index into shape, establishes the biasing of occupant's chest and touches optimization agent model, using genetic algorithm, is solved more above
Dummy breast simplified model under operating mode is touched in objective optimisation problems, generation biasing.
Claims (4)
1. dummy breast simplified model design method under operating mode is touched in one kind biasing, it is characterised in that methods described includes：
(1), the mechanic equivalentization processing main endergonic structure of human chest；
Operating mode is touched according to automobile biasing, with a Curved Beam Structure equivalent simulation human body rib knot in impact direction plane
Structure, rib size use human chest intermediate frame size.Soft tissue in torso model is simulated with mass in an equal set
Lumped mass, mass are located at torso model geometric center.
(2), the non-key structure simplification processing of human chest；
According to non-key endergonic structure feature in human chest structure in automobile collision procedure.It is just hardened using prismatic rectangle
Structure simplifies simulation human spine structure.Using medical image processing technology, simplify simulation human body skin muscle from elastomeric material
Outline construction geometry structure.
(3) human chest complete structure, is established；
Connection is established between rib, backbone, lumped mass block, framing system is articulated with spine structure, according to stressing conditions,
Mass and rib non-percussion side, mass and and spine structure between stretching be respectively adopted be connected with torsion cluster spring.
Arrange that an extension spring (being θ with human body front angle) establishes the connection of rib and mass on impact direction.
(4) human chest finite element initial model, is established；
With CAE analysis software, unit ionization processing is carried out to above-mentioned human chest complete structure.Assign chest construction material
Attribute, conditions setting etc..Operating mode human chest finite element initial model is touched in generation biasing.
(5), chest FEM model optimizes；
(5.1), using dummy's central collision and side impact rating test as analysis operating mode, chest initial model optimization analysis platform is built；
(5.2), based on response phase method, using dummy's central collision and side impact rating test as constraints, with curved beam, spring structure parameter
For design variable, using the shifting of the dummy breast rating test middle rib position of bone, pendulum force regulation index as optimization aim, occupant's chest is established
Structure optimization agent model is touched in biasing；
(5.3) optimized algorithm, is chosen, solves above multi-objective optimization question, generation biasing touches dummy breast under operating mode and simplifies mould
Type.
2. dummy breast simplified model design method under operating mode is touched in a kind of biasing according to claim 1, it is characterised in that：
Step (4) establishes human chest finite element initial model, and assigning chest construction material properties includes：
(2.1) beam element attribute assignment, is carried out to the framing system of equivalentization；
(2.2) shell unit attribute assignment, is carried out to soft tissue structures such as the skin of chest muscle of foundation；
(2.3) body unit attribute assignment, is carried out to the spine structure of equivalentization；
(2.4), by thoracic cavity institutional framework mass concentration at torso model geometric center, to thoracic cavity lumped mass block
Carry out body unit attribute assignment；
(2.5) spring unit attribute assignment, is carried out to spring structure on frame section surface.
3. dummy breast simplified model design method under operating mode is touched in a kind of biasing according to claim 1, it is characterised in that：
Extension spring and human body front angle theta span are 0 °~90 ° on the impact direction being related in step (3) described structure.
4. dummy breast simplified model design side under operating mode is touched in a kind of biasing as claimed in any of claims 1 to 3
Method, it is characterised in that：Step also includes：
Occupant's chest FEM model is initialized, framing system force-displacement curve and force-velocity curve is inputted, is assigned to beam list
Member, wherein force-displacement curve and force-velocity curve are by impact simulation emulation experiment or experiment is touched in the biasing of occupant's chest, theory pushes away
The mode of leading obtains, so as to obtain rib acceleration and the distribution of breast compressions amount.
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Cited By (2)
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| CN109255166A (en) * | 2018-08-23 | 2019-01-22 | 天津瑷睿赛福科技有限公司 | The quick equivalent modeling method of rear-end collision crash test dummy's neck new construction |
| CN114970288A (en) * | 2022-07-21 | 2022-08-30 | 中汽研汽车检验中心（天津）有限公司 | Simulation modeling method for collision finite element dummy skin part |
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| US20170061829A1 (en) * | 2015-08-31 | 2017-03-02 | Humanetics Innovative Solutions, Inc. | Customized chest response finite element model for crash test dummy and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109255166A (en) * | 2018-08-23 | 2019-01-22 | 天津瑷睿赛福科技有限公司 | The quick equivalent modeling method of rear-end collision crash test dummy's neck new construction |
| CN114970288A (en) * | 2022-07-21 | 2022-08-30 | 中汽研汽车检验中心（天津）有限公司 | Simulation modeling method for collision finite element dummy skin part |
| CN114970288B (en) * | 2022-07-21 | 2022-10-14 | 中汽研汽车检验中心（天津）有限公司 | Simulation modeling method for collision finite element dummy skin part |
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