CN109033703A - Frontal crash of vehicles tests the quick equivalent modeling method of manikin head's new construction - Google Patents
Frontal crash of vehicles tests the quick equivalent modeling method of manikin head's new construction Download PDFInfo
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Abstract
The present invention relates to a kind of frontal crash of vehicles to test the quick equivalent modeling method of manikin head's new construction, belongs to automotive crash safety field.Head simplified model is established including 1..Human body head is scanned, the equivalent mass block of three main portions such as the geometrical model with skull profile and its internal brain, cerebellum and brain stem is established；Its skin, muscle etc. are replaced with elastic material；Equivalent head quality-spring equivalent system is established in movement and force-bearing situation according to head during frontal crash of vehicles, is described its biomechanical response characteristic to simulate, is generated the initial finite element model of simulation manikin head's structure；2. being based on head rating test criterion, relevant design variable is chosen, parametric sensitivity optimization design is carried out to the initial reduced model of head construction, obtains the high model of head construction mechanical characteristic fidelity.Since the design can obtain equivalent simplification head construction model, operating rate is fast, can provide reference for the quick Equivalent Modeling of conceptual phase.
Description
Technical field
The present invention relates to automotive crash safety technical fields, test more particularly to frontal crash of vehicles new with manikin head
The quick equivalent modeling method of structure.
Background technique
With the fast development of automobile industry, the production cost of automobile and production cycle are gradually decreased, and give people's lives band
Great convenience is carried out, bring traffic accident at the same time and traffic safety hidden danger cause a large amount of casualties and wealth
Loss is produced, automotive safety Journal of Sex Research becomes the research topic of automotive field indispensability, and in vehicle passive safety field, automobile touches
Hit experiment it is essential, crash dummy comes into being as passive security test device, for evaluating vehicle to passenger's
Protective value.Show in frontal crash of vehicles accident, exist and seriously injure occupant's life security according to survey data
The case where ratio be more than 60%.In these accidents, head injuries is also the accident of most frequent generation, is brought to passenger
The expendable pain of injury, and threat to life.
In automobile crashes, the injury on head mostly made from skull by impact force brain tissue by
Injury.Exclusion external force, which directly smashes skull, to be caused outside directly fatal pole serious conditions, and skull bone split is a kind of very serious at last
Injury.This be skull be subject to biggish external impacts and caused by, it is serious but will threat to life；And adjoint cerebral concussion
Deng injury, though being not fatal, it can also cause temporary dysfunction.The Nomenclature Composition and Structure of Complexes of human body head is extremely complex, occupies
Maximum head construction specific gravity is brain, cerebellum and brain stem three parts structure.
The present invention is directed to motion state and head of the human body head in automobile collision accident easily attractive in accident
The injury such as skull bone split and cerebral concussion provides a kind of frontal crash of vehicles test manikin head's new construction design.
Summary of the invention
The object of the present invention is to provide a kind of frontal crash of vehicles to test the quick equivalent modeling method of manikin head's new construction,
While simplifying human body head complex organization structure, moreover it is possible to fortune of the brain tissue when frontal crash of vehicles occurs in analogue head
Dynamic and impact effect, while the advantage for also having computation rate fast.The present invention can be used for automobile rear collision head dynamics
Research.
Above-mentioned purpose of the invention is achieved through the following technical solutions:
1. a kind of frontal crash of vehicles tests the quick equivalent modeling method of manikin head's new construction, which is characterized in that described
Method includes:
(1) head simplified model is constructed
(1.1) medicine CT and MRI scan human body head data are utilized, obtain skull structure outline and quality, foundation has
The geometrical model of skull profile；
(1.2) medicine CT and MRI scan human body head data are utilized, obtain arriving brain, cerebellum and brain stem etc. three in head
The quality of a main portions；
(1.3) skin of head, muscle etc. are replaced with elastic rubber material, to the main collision forced position on head, are based on
The design of skull structure is molded into head configuration profile, establishes head surface geometry；
(1.4) it on the basis of the geometry, according to mechanics force analysis and the principle of equal effects, is touched according to automobile front
The movement on head and force-bearing situation during hitting carry out Equivalent Modeling, the biology of analogue head inner tissue to brain tissue in skull
Mechanical characteristic；
(1.5) structure is utilized, the finite element model of simulation manikin head's structure is generated；
(2) Optimal Structure Designing is carried out to head simplified model:
(2.1) it is based on head rating test criterion, establishes head simplified model analysis of optimizing design operating condition；
(2.2) to the main force part in the simplified model of head, material properties are set, as optimization initial parameter；
(2.3) sensitivity analysis principle is utilized, the material parameter for choosing the above-mentioned main force part of head simplified model is made
It optimizes and sets using head resultant acceleration, head transverse acceleration and single peak value as optimization aim for design variable
Meter, obtains making the highest most optimum materials parameter of the head construction mechanical characteristic fidelity, and it is optimal limited with this to establish head
Meta-model；
2. a kind of frontal crash of vehicles according to claim 1 tests the quick Equivalent Modeling side of manikin head's new construction
Method, it is characterised in that: the equivalent-simplification initial model of crash dummy head construction establishes specific steps and includes:
(2.1) the skull skeleton pattern of scanning is modified, by eye profile, nasal bone, tooth and the lower jaw in skull
The portion structures such as bone are simplified, and continuous closed skull profile is modified to；
(2.2) according to the brain tissue qualitative data of scanning, the centroid position of brain, cerebellum and brain stem is determined；
It (2.3) is the mass block of phase homogenous quantities, position by the primary textures equivalent-simplification such as brain, cerebellum and brain stem
It is overlapped respectively with respective centroid position, meanwhile, the mass center that three determines jointly is overlapped with head centroid position；
(2.4) above-mentioned mass block is attached by tension and torsion spring and supporting beam；
(2.5) head centroid position described in step (2.3) is determined by support beam and right angle supporting beam come common,
Middle right angle supporting beam is nested in support beam, and can be relatively rotated with respect to support beam；
(2.6) forehead position in head is the dominating impact position in collision process, to guarantee head internal structure stability,
In the case where guaranteeing that mechanical characteristic is constant, two groups of tension and torsion springs are set with forehead connecting place；
(2.7) the head last time described in is main force part, therefore skin of head is simplified, only in the head established
Integumentary musculature rubber material is established on bone model top；
3. a kind of frontal crash of vehicles according to claim 1 tests the quick Equivalent Modeling side of manikin head's new construction
Method, it is characterised in that: to the simplified model of head construction in step (2.2), material properties, which are arranged, includes:
(3.1) to the body unit attribute assignment of the simplified model of the skin of neck muscle of foundation；
(3.2) body unit attribute assignment is carried out to simplified skull structure；
(3.3) spring unit attribute assignment is carried out to tension and torsion spring；
(3.4) beam element attribute assignment is carried out to above-mentioned rigid beam element；
4. a kind of frontal crash of vehicles according to claim 1 tests the quick Equivalent Modeling side of manikin head's new construction
Method, it is characterised in that: body unit attribute assignment is carried out to the simplified model of the skin of head muscle of foundation described in step (3.1)
It include: density, elasticity modulus and Poisson's ratio；Material selection elastic material；
5. a kind of frontal crash of vehicles according to claim 1 tests the quick Equivalent Modeling side of manikin head's new construction
Method, it is characterised in that: tension and torsion spring described in step (3.3) is the main force mechanism of head interior tissue, unit
Attribute assignment includes: elasticity modulus；
6. a kind of frontal crash of vehicles according to claim 1 tests the quick Equivalent Modeling side of manikin head's new construction
Method, it is characterised in that: drawing-pressing spring involved in structure described in step (2.4) described structure is non-linear drawing-pressing spring, is turned round
Turning spring is nonlinear torsion spring；
7. a kind of frontal crash of vehicles according to claim 1 tests the quick Equivalent Modeling side of manikin head's new construction
Method, it is characterised in that: initialization occupant's head finite element model, input head resultant acceleration, head transverse acceleration and list
One peak value is assigned to head beam element, and curve is by the side such as impact simulation emulation experiment or occupant's head calibration experiment, post-processing
Formula obtains.
Present invention has an advantage that by establishing head geometry model, in the head construction design basis, benefit
With the integumentary musculature profile of the rubber injection mold molding main force part in head top, head surface geometry is established；According to power
Force analysis and the principle of equal effects are learned, according to movement of head rating test head when being impacted and mechanical characteristic, to head
Internal brain tissue carries out Equivalent Modeling, obtains finite element model；Parameter optimization design is carried out to above-mentioned finite element model.This side
Method can simplify human body head complex organization structure, moreover it is possible to fortune of the brain tissue when frontal crash of vehicles occurs in analogue head
Dynamic and impact effect, while computation rate can be also promoted, it is used for head dynamics research.
Detailed description of the invention
Fig. 1 is flow diagram of the invention；
Fig. 2 is occupant's head equivalent simplified model side view；
Fig. 3 is occupant's row inequivalence model top view；
Fig. 4 is tension and torsion spring schematic diagram；
Mark explanation: 1- skin；2- skull；3- supporting beam；4- mass block (M1- brain；M2- cerebellum；M3- brain stem)；5-
Tension and torsion spring；The right angle 6- supporting beam (node is centroid position)；7- support beam.
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing.Following instance for illustrating the present invention,
But it is not used in and limits the scope of the invention.Referring to figures 1-4
1. a kind of frontal crash of vehicles tests the quick equivalent modeling method of manikin head's new construction, which is characterized in that described
Method includes:
(1) head simplified model is constructed
(1.1) medicine CT and MRI scan human body head data are utilized, obtain skull structure outline and quality, foundation has
The geometrical model of skull profile；
(1.2) medicine CT and MRI scan human body head data are utilized, obtain arriving brain, cerebellum and brain stem etc. three in head
The quality of a main portions；
(1.3) skin of head, muscle etc. are replaced with elastic rubber material, to the main collision forced position on head, are based on
The design of skull structure is molded into head configuration profile, establishes head surface geometry；
(1.4) it on the basis of the geometry, according to mechanics force analysis and the principle of equal effects, is touched according to automobile front
The movement on head and force-bearing situation during hitting carry out Equivalent Modeling, the biology of analogue head inner tissue to brain tissue in skull
Mechanical characteristic；
(1.5) structure is utilized, the finite element model of simulation manikin head's structure is generated.
(2) Optimal Structure Designing is carried out to head simplified model:
(2.1) it is based on head rating test criterion, establishes head simplified model analysis of optimizing design operating condition；
(2.2) to the main force part in the simplified model of head, material properties are set, as optimization initial parameter；
(2.3) sensitivity analysis principle is utilized, the material parameter for choosing the above-mentioned main force part of head simplified model is made
It optimizes and sets using head resultant acceleration, head transverse acceleration and single peak value as optimization aim for design variable
Meter, obtains making the highest most optimum materials parameter of the head construction mechanical characteristic fidelity, and it is optimal limited with this to establish head
Meta-model.
2. a kind of frontal crash of vehicles according to claim 1 tests the quick Equivalent Modeling side of manikin head's new construction
Method, it is characterised in that: the foundation of manikin head's equivalent simplified model includes:
(2.1) the skull skeleton pattern of scanning is modified, by eye profile, nasal bone, tooth and the lower jaw in skull
The portion structures such as bone are simplified, and continuous closed skull profile is modified to；
(2.2) according to the brain tissue qualitative data of scanning, the centroid position of brain, cerebellum and brain stem is determined；
It (2.3) is the mass block of phase homogenous quantities, position by the primary textures equivalent-simplification such as brain, cerebellum and brain stem
It is overlapped respectively with respective centroid position, meanwhile, the mass center that three determines jointly is overlapped with head centroid position；
(2.4) above-mentioned mass block is attached by tension and torsion spring and supporting beam；
(2.5) head centroid position described in step (2.3) is determined by support beam and right angle supporting beam come common,
Middle right angle supporting beam is nested in support beam, and can be relatively rotated with respect to support beam；
(2.6) forehead position in head is the dominating impact position in collision process, to guarantee head internal structure stability,
In the case where guaranteeing that mechanical characteristic is constant, two groups of tension and torsion springs are set with forehead connecting place；
(2.7) the head last time described in is main force part, therefore skin of head is simplified, only in the head established
Integumentary musculature rubber material is established on bone model top.
3. a kind of frontal crash of vehicles according to claim 1 tests the quick Equivalent Modeling side of manikin head's new construction
Method, it is characterised in that: to the simplified model of head construction in step (2.2), material properties, which are arranged, includes:
(3.1) to the body unit attribute assignment of the simplified model of the skin of neck muscle of foundation；
(3.2) body unit attribute assignment is carried out to simplified skull structure；
(3.3) spring unit attribute assignment is carried out to tension and torsion spring；
(3.4) beam element attribute assignment is carried out to above-mentioned rigid beam element.
4. a kind of frontal crash of vehicles according to claim 1 tests the quick Equivalent Modeling side of manikin head's new construction
Method, it is characterised in that: body unit attribute assignment is carried out to the simplified model of the skin of head muscle of foundation described in step (3.1)
It include: density, elasticity modulus and Poisson's ratio；Material selection elastic material.
5. a kind of frontal crash of vehicles according to claim 1 tests the quick Equivalent Modeling side of manikin head's new construction
Method, it is characterised in that: tension and torsion spring described in step (3.3) is the main force mechanism of head interior tissue, unit
Attribute assignment includes: elasticity modulus.
6. a kind of frontal crash of vehicles according to claim 1 tests the quick Equivalent Modeling side of manikin head's new construction
Method, it is characterised in that: drawing-pressing spring involved in structure described in step (2.4) described structure is non-linear drawing-pressing spring, is turned round
Turning spring is nonlinear torsion spring.
7. a kind of frontal crash of vehicles according to claim 1 tests the quick Equivalent Modeling side of manikin head's new construction
Method, it is characterised in that: initialization occupant's head finite element model, input head resultant acceleration, head transverse acceleration and list
One peak value is assigned to head beam element, and curve is by the side such as impact simulation emulation experiment or occupant's head calibration experiment, post-processing
Formula obtains.
Claims (7)
1. a kind of frontal crash of vehicles tests the quick equivalent modeling method of manikin head's new construction, which is characterized in that the method
It include: (1) building head simplified model
(1.1) medicine CT and MRI scan human body head data are utilized, skull structure outline and quality are obtained, establishing has skull
The geometrical model of profile.
(1.2) medicine CT and MRI scan human body head data are utilized, are obtained in head to three masters such as brain, cerebellum and brain stems
Want the quality at position.
(1.3) skin of head, muscle etc. are replaced with elastic rubber material, to the main collision forced position on head, are based on skull
The design of structure is molded into head configuration profile, establishes head surface geometry.
(1.4) on the basis of the geometry, according to mechanics force analysis and the principle of equal effects, according to frontal crash of vehicles mistake
The movement on head and force-bearing situation in journey carry out Equivalent Modeling, the biomethanics of analogue head inner tissue to brain tissue in skull
Characteristic.
(1.5) structure is utilized, the finite element model of simulation manikin head's structure is generated.
(2) Optimal Structure Designing is carried out to head simplified model
(2.1) it is based on head rating test criterion, establishes head simplified model analysis of optimizing design operating condition.
(2.2) to the main force part in the simplified model of head, material properties are set, as optimization initial parameter.
(2.3) sensitivity analysis principle is utilized, the material parameter for choosing the above-mentioned main force part of head simplified model, which is used as, to be set
Meter variable is optimized, is obtained using head resultant acceleration, head transverse acceleration and single peak value as optimization aim
To making the highest most optimum materials parameter of the head construction mechanical characteristic fidelity, and the optimal finite element mould in head is established with this
Type.
2. a kind of frontal crash of vehicles according to claim 1 tests the quick equivalent modeling method of manikin head's new construction,
It is characterized by: the equivalent-simplification initial model of crash dummy head construction establishes specific steps includes:
(2.1) the skull skeleton pattern of scanning is modified, by eye profile, nasal bone, tooth and the mandibular etc. in skull
Portion structure is simplified, and continuous closed skull profile is modified to.
(2.2) according to the brain tissue qualitative data of scanning, the centroid position of brain, cerebellum and brain stem is determined.
It (2.3) is the mass block of phase homogenous quantities, position difference by the primary textures equivalent-simplification such as brain, cerebellum and brain stem
It is overlapped with respective centroid position, meanwhile, the mass center that three determines jointly is overlapped with head centroid position.
It (2.4) is attached by tension and torsion spring and supporting beam between above-mentioned mass block.
(2.5) head centroid position described in step (2.3) is determined by support beam and right angle supporting beam come common, wherein directly
Angle supporting beam is nested in support beam, and can be relatively rotated with respect to support beam.
(2.6) forehead position in head is that the dominating impact position in collision process is being protected to guarantee head internal structure stability
In the case that card mechanical characteristic is constant, two groups of tension and torsion springs are set with forehead connecting place.
(2.7) the head top described in is main force part, therefore skin of head is simplified, only in the skull mould established
Integumentary musculature rubber material is established on type top.
3. a kind of frontal crash of vehicles according to claim 1 tests the quick equivalent modeling method of manikin head's new construction,
It is characterized by: material properties, which are arranged, includes: to the simplified model of head construction in step (2.2)
(3.1) to the body unit attribute assignment of the simplified model of the skin of neck muscle of foundation.
(3.2) body unit attribute assignment is carried out to simplified skull structure.
(3.3) spring unit attribute assignment is carried out to tension and torsion spring.
(3.4) beam element attribute assignment is carried out to above-mentioned rigid beam element.
4. a kind of frontal crash of vehicles according to claim 1 tests the quick equivalent modeling method of manikin head's new construction,
It is characterized by: carrying out body unit attribute assignment packet to the simplified model of the skin of head muscle of foundation described in step (3.1)
It includes: density, elasticity modulus and Poisson's ratio；Material selection elastic material.
5. a kind of frontal crash of vehicles according to claim 1 tests the quick equivalent modeling method of manikin head's new construction,
It is characterized by: tension and torsion spring described in step (3.3) is the main force mechanism of head interior tissue, cell attribute
Assignment includes: elasticity modulus.
6. a kind of frontal crash of vehicles according to claim 1 tests the quick equivalent modeling method of manikin head's new construction,
It is characterized by: drawing-pressing spring involved in structure described in step (2.4) described structure is non-linear drawing-pressing spring, bullet is reversed
Spring is nonlinear torsion spring.
7. a kind of frontal crash of vehicles according to claim 1 tests the quick equivalent modeling method of manikin head's new construction,
It is characterized by: initialization occupant's head finite element model, input head resultant acceleration, head transverse acceleration and simple spike
Value, is assigned to head beam element, curve is obtained by the modes such as impact simulation emulation experiment or occupant's head calibration experiment, post-processing
?.
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Application publication date: 20181218 |