CN109492331A - A kind of cactus biomimetic features energy-absorption box and its optimization method - Google Patents
A kind of cactus biomimetic features energy-absorption box and its optimization method Download PDFInfo
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 92
- 230000003592 biomimetic effect Effects 0.000 title claims abstract description 81
- 241000219357 Cactaceae Species 0.000 title claims abstract description 46
- 238000005457 optimization Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 25
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- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The invention discloses a kind of cactus biomimetic features energy-absorption box and its optimization method, cactus biomimetic features energy-absorption box includes front box body, middle part box body and rear portion box body, is formed referring to cactus outer shape Bionic Design.The invention also discloses a kind of Multipurpose Optimal Methods of cactus biomimetic features energy-absorption box, using the partial parameters of energy-absorbing box structure as optimized variable, establish corresponding objective function agent model, according to low speed collision regulation, constraint condition is set, cactus biomimetic features energy-absorption box Model for Multi-Objective Optimization is established, multiple-objection optimization is carried out to biomimetic features energy-absorption box using NSGA-II optimization algorithm.
Description
Technical field
The present invention relates to vehicle passive safety protection field more particularly to a kind of cactus biomimetic features energy-absorption boxes and its excellent
Change method.
Background technique
Automobile mainly absorbs energy, the reduction that collision generates when head-on crash occurs by automobile front energy-absorbing box
Maximal impact mitigates impact in turn, to improve the crash-worthiness of vehicle, reduce the injury to interior driver and passenger.The celestial being
People slaps biomimetic features energy-absorption box front end and is connected with bumper beam, and rear end is connected with collision prevention girders, which can occur steady ordered
Deformation so that increase energy-absorption box energy absorption characteristics.The energy-absorption box used in current automobile is mostly square structure, and this structure exists
Deformation is not sufficiently stable in collision process, be cannot be fully absorbed the energy generated in collision process, can be reached energy in cockpit
It causes serious injury to member in cabin.
Summary of the invention
The technical problem to be solved by the present invention is to it is imitative to provide a kind of cactus for the deficiency being previously mentioned in background technique
Raw structure energy-absorption box and its optimization method.
The present invention uses following technical scheme to solve above-mentioned technical problem:
A kind of cactus biomimetic features energy-absorption box includes the front box body, middle part box body and rear portion box body being sequentially connected；
The front box body and automobile front beam crossbeam are connected, and rear portion box body and automobile buffer beam are connected；
The front box body, middle part box body, rear portion box body are in hexagonal star-shape, include 12 rectangular side panels, and ten
Six interior dog-ears and six outer dog-ears are formed between two rectangular side panels；Six interior dog-ears and six outer dog-ears are rounding
Angle；Enable intersection between rectangular side panels and its adjacent rectangle side plate length be the length of the rectangular side panels, rectangular side panels perpendicular to
The length on the side of the intersection is the width of rectangular side panels；
The front box body, middle part box body, the width of rectangular side panels is equal in the box body of rear portion；
The length of rectangular side panels is greater than the length of rectangular side panels in the box body of front and is less than middle part box in the rear portion box body
The length of rectangular side panels in body；
The thickness of rectangular side panels is greater than the thickness of rectangular side panels in the box body of front and is less than rear cartridge in the middle part box body
The thickness of rectangular side panels in body.
As a kind of further prioritization scheme of cactus biomimetic features energy-absorption box of the present invention, six outer dog-ears and six
The range of a infolding angular radius is 0-6mm, and the range of the interior dog-ear angle is 30-100 degree.
As a kind of further prioritization scheme of cactus biomimetic features energy-absorption box of the present invention, the front box body, middle part
The range of the width of rectangular side panels is 30-40mm in box body, rear portion box body.
As a kind of further prioritization scheme of cactus biomimetic features energy-absorption box of the present invention, the front box body, middle part
The ratio of the length of rectangular side panels is 1:3:2 in box body, rear portion box body.
As a kind of further prioritization scheme of cactus biomimetic features energy-absorption box of the present invention, the front box body rectangular side
The range of the thickness of plate is 0.5-0.7mm, and the range of the thickness of the middle part box body rectangular side panels is 0.7-0.9mm, after described
The range of the thickness of portion's box body rectangular side panels is 0.9-1.1mm.
The present invention gives a kind of optimization method of cactus biomimetic features energy-absorption box, comprising the following steps:
Step 1) chooses optimal Latin hypercube design method in Isight optimization software, optimizes in each needs
Uniformly choose N group design sample point in the preset threshold range of design variable parameter, N is natural number greater than 0, to preset
Threshold value；The design variable parameter for needing to optimize includes width L, the infolding angular radius R of rectangular side panels1, in leading portion box body
The thickness T of rectangular side panels1, the thickness T of rectangular side panels in the box body of middle section2, the thickness T of rectangular side panels in back segment box body3；
Step 2) establishes N group cactus biomimetic features energy-absorption box according to the design sample of selection point in Catia software
CAD model, GTD model and grid dividing are carried out to it, and the material category of cactus biomimetic features energy-absorption box each section is set
Property and thickness, establish N group low speed collision model in conjunction with rigid wall；
N group low speed collision mode input LS-DYNA is carried out post-processing calculating, to peak after simulation analysis structure by step 3)
Be worth impact force, the total energy-absorbing of biomimetic features energy-absorption box, biomimetic features energy-absorption box quality, compression displacement, average impact, than energy-absorbing into
Row statistics calculates, using response phase method building peak value impact force, biomimetic features energy-absorption box quality, compression displacement, than energy-absorbing, average
The second-order response surface model of impact force, and calculate the related coefficient and root-mean-square error of the fitting of this five response surface models；
Step 4), using biomimetic features energy-absorption box quality, compression displacement, peak value impact force as constraint condition, averagely to touch
Power is hit and than energy-absorbing as optimization aim, with L, R1、T1、T2、T3As optimization design variable, constructs cactus biomimetic features and inhale
It can box multiple-objection optimization mathematical model；
Step 5) establishes cactus biomimetic features energy-absorption box multiple-objection optimization mathematical model in Isight software, uses
NSGA-II multi-objective optimization algorithm carries out multiple-objection optimization to the design variable of selection, obtains Pareto disaggregation, solves from Pareto
It concentrates and chooses one group of optimal solution；And biomimetic features energy-absorption box finite element model and low speed collision mould are established according to this group of optimal solution
Type substitutes into LS-DYNA and carries out post-processing calculating, the simulation analysis calculated result of the biomimetic features energy-absorption box after being optimized.
As a kind of further prioritization scheme of optimization method of cactus biomimetic features energy-absorption box of the present invention, the step
3) five response surface models difference in is as follows:
Biomimetic features energy-absorption box impact force peak FmaxResponse surface model are as follows:
Fmax=109.261-0.445375R-5.8997L-80.5005T1-110.316T2+92.752T3
+0.42839R2+0.103799L2-122.568T1 2-42.1607T2 2+2.951T3 2
-0.0885RL-5.3172RT1+3.24787RT2+0.5758RT3+7.28799LT1
-1.21888T2-0.2929LT3+426.358T1T2-95.508T1T3-33.2798T2T3
The response surface model of biomimetic features energy-absorption box mass M are as follows:
M=-1.0879-0.004035R+0.00236L-0.38235T1+0.487386T2+1.93708T3
-8.13203e-005R2-7.68616e-005L2+0.1224T1 2+0.07296T2 2-0.52997T3 2
+7.60055e-005RL-0.0028RT1-0.014025RT2+0.006208RT3+0.013449LT1
+0.020155LT2-0.00358LT3-0.24267T1T2+0.10969T1T3-0.74927T2T3
The response surface model of biomimetic features energy-absorption box compression displacement S are as follows:
S=731.5204-0.3523R-5.8116L-134.961T1-259.665T2-420.378T3
-0.8914R2+0.034048L2-84.6365T1 2+16.178T2 2+87.8146T3 2
+0.1219RL+10.245RT1-0.8669RT2-3.1156RT3+0.9842LT1
-0.63837LT2+1.991LT3+67.6439T1T2+62.904T1T3+95.205T2T3
Biomimetic features energy-absorption box average impact FavResponse surface model are as follows:
Fav=391.015+2.14525R-5.566L-446.7037T1-35.565T2-66.561T3
-0.10361R2+0.00603L2+298.7148T1 2+81.5567T2 2+7.8474T3 2
+0.03276RL-4.18929RT1-0.70067RT2+0.91359RT3+3.3045LT1
+1.5565T2+0.1896LT3-242.465T1T2+72.312T1T3-3.7884T2T3
Biomimetic features energy-absorption box is than energy-absorbing ESEAResponse surface model are as follows:
ESEA=107038.24+953.075R-1764.637L-837.368T1-55498.556T2
-59025.06T3+17.861R2+14.003L2+7491.3603T1 2+18066.29T2 2
+14280.959T3 2-10.0727RL-971.812RT1+146.343RT2-32.0797RT3
-125.83LT1+247T2+313.7LT3-10333T1T2+3379.7T1T3+15945T2T3
As a kind of further prioritization scheme of optimization method of cactus biomimetic features energy-absorption box of the present invention, the step
4) the cactus biomimetic features energy-absorption box multiple-objection optimization mathematical model in are as follows:
As a kind of further prioritization scheme of optimization method of cactus biomimetic features energy-absorption box of the present invention, N value is
100。
The invention adopts the above technical scheme compared with prior art, has following technical effect that
1. the present invention proposes a kind of cactus biomimetic features energy-absorption box, it is not steady enough to efficiently solve traditional energy-absorption box deformation
Calmly, the defects of energy-absorbing effect is bad；
2. multi-objective optimization design of power is carried out to cactus biomimetic features energy-absorption box using NSGA-II multi-objective optimization algorithm,
Further increase the energy absorption characteristics of biomimetic features energy-absorption box.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the cross-sectional view of middle front part box body of the present invention.
In figure, 1- energy-absorption box front box body, box body in the middle part of 2- energy-absorption box, 3- energy-absorption box rear portion box body, dog-ear in 4-, outside 5-
Dog-ear.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing:
The present invention can be embodied in many different forms, and should not be assumed that be limited to the embodiments described herein.On the contrary,
It is thorough and complete to these embodiments are provided so that the disclosure, and model of the invention will be given full expression to those skilled in the art
It encloses.In the accompanying drawings, for the sake of clarity it is exaggerated component.
As shown in Figure 1 and Figure 2, the invention discloses a kind of cactus biomimetic features energy-absorption box, include the front being sequentially connected
Box body, middle part box body and rear portion box body；
The front box body and automobile front beam crossbeam are connected, and rear portion box body and automobile buffer beam are connected；
The front box body, middle part box body, rear portion box body are in hexagonal star-shape, include 12 rectangular side panels, and ten
Six interior dog-ears and six outer dog-ears are formed between two rectangular side panels；Six interior dog-ears and six outer dog-ears are rounding
Angle；Enable intersection between rectangular side panels and its adjacent rectangle side plate length be the length of the rectangular side panels, rectangular side panels perpendicular to
The length on the side of the intersection is the width of rectangular side panels；
The front box body, middle part box body, the width of rectangular side panels is equal in the box body of rear portion；
The length of rectangular side panels is greater than the length of rectangular side panels in the box body of front and is less than middle part box in the rear portion box body
The length of rectangular side panels in body；
The thickness of rectangular side panels is greater than the thickness of rectangular side panels in the box body of front and is less than rear cartridge in the middle part box body
The thickness of rectangular side panels in body.
This design sufficiently be crushed thus as much as possible so that energy-absorption box front end rigidity is low as far as possible in middle position
Energy is absorbed, energy-absorption box rear end has greater stiffness to guarantee that energy-absorption box keeps stablizing plastic deformation.
The range of six outer dog-ears and six infolding angular radius is 0-6mm, and the range of interior dog-ear angle is 30-100
Degree.
The front box body, middle part box body, the range of the width of rectangular side panels is 30-40mm in the box body of rear portion.
The front box body, middle part box body, the ratio of the length of rectangular side panels is 1:3:2 in the box body of rear portion.
The range of the thickness of the front box body rectangular side panels is 0.5-0.7mm, the thickness of the middle part box body rectangular side panels
The range of degree is 0.7-0.9mm, and the range of the thickness of the rear portion box body rectangular side panels is 0.9-1.1mm.
One group of specific design parameter is given below: biomimetic features energy-absorption box axial length is designed referring to traditional energy-absorption box, is
228mm.Front box body, middle part box body, in the box body of rear portion, the width of rectangular side panels is 36mm, and the thickness of rectangular side panels is successively
For 0.6mm, 0.8mm, 1.0mm, the radius of six outer dog-ears and six interior dog-ears is 3mm, and interior dog-ear angle is 60 degree.Front
Box body and middle part box body are attached by laser assembly solder, and middle part box body and rear portion box body are attached by laser assembly solder.
The invention also discloses a kind of optimization methods of cactus biomimetic features energy-absorption box, comprising the following steps:
Step 1) chooses optimal Latin hypercube design method in Isight optimization software, optimizes in each needs
Uniformly choose N group design sample point in the preset threshold range of design variable parameter, N is natural number greater than 0, preferentially takes 100；
The design variable parameter for needing to optimize includes width L, the infolding angular radius R of rectangular side panels1, rectangular side panels in leading portion box body
Thickness T1, the thickness T of rectangular side panels in the box body of middle section2, the thickness T of rectangular side panels in back segment box body3；
Step 2) establishes N group cactus biomimetic features energy-absorption box according to the design sample of selection point in Catia software
CAD model, GTD model and grid dividing are carried out to it, and the material category of cactus biomimetic features energy-absorption box each section is set
Property and thickness, establish N group low speed collision model in conjunction with rigid wall；
N group low speed collision mode input LS-DYNA is carried out post-processing calculating, to peak after simulation analysis structure by step 3)
Be worth impact force, the total energy-absorbing of biomimetic features energy-absorption box, biomimetic features energy-absorption box quality, compression displacement, average impact, than energy-absorbing into
Row statistics calculates, using response phase method building peak value impact force, biomimetic features energy-absorption box quality, compression displacement, than energy-absorbing, average
The second-order response surface model of impact force, and calculate the related coefficient and root-mean-square error of the fitting of this five response surface models；
Step 4), using biomimetic features energy-absorption box quality, compression displacement, peak value impact force as constraint condition, averagely to touch
Power is hit and than energy-absorbing as optimization aim, with L, R1、T1、T2、T3As optimization design variable, constructs cactus biomimetic features and inhale
It can box multiple-objection optimization mathematical model；
Step 5) establishes cactus biomimetic features energy-absorption box multiple-objection optimization mathematical model in Isight software, uses
NSGA-II multi-objective optimization algorithm carries out multiple-objection optimization to the design variable of selection, obtains Pareto disaggregation, solves from Pareto
It concentrates and chooses one group of optimal solution；And biomimetic features energy-absorption box finite element model and low speed collision mould are established according to this group of optimal solution
Type substitutes into LS-DYNA and carries out post-processing calculating, the simulation analysis calculated result of the biomimetic features energy-absorption box after being optimized.
Five response surface models difference in the step 3) is as follows:
Biomimetic features energy-absorption box impact force peak FmaxResponse surface model are as follows:
Fmax=109.261-0.445375R-5.8997L-80.5005T1-110.316T2+92.752T3
+0.42839R2+0.103799L2-122.568T1 2-42.1607T2 2+2.951T3 2
-0.0885RL-5.3172RT1+3.24787RT2+0.5758RT3+7.28799LT1
-1.21888T2-0.2929LT3+426.358T1T2-95.508T1T3-33.2798T2T3
The response surface model of biomimetic features energy-absorption box mass M are as follows:
M=-1.0879-0.004035R+0.00236L-0.38235T1+0.487386T2+1.93708T3
-8.13203e-005R2-7.68616e-005L2+0.1224T1 2+0.07296T2 2-0.52997T3 2
+7.60055e-005RL-0.0028RT1-0.014025RT2+0.006208RT3+0.013449LT1
+0.020155LT2-0.00358LT3-0.24267T1T2+0.10969T1T3-0.74927T2T3
The response surface model of biomimetic features energy-absorption box compression displacement S are as follows:
S=731.5204-0.3523R-5.8116L-134.961T1-259.665T2-420.378T3
-0.8914R2+0.034048L2-84.6365T1 2+16.178T2 2+87.8146T3 2
+0.1219RL+10.245RT1-0.8669RT2-3.1156RT3+0.9842LT1
-0.63837LT2+1.991LT3+67.6439T1T2+62.904T1T3+95.205T2T3
Biomimetic features energy-absorption box average impact FavResponse surface model are as follows:
Fav=391.015+2.14525R-5.566L-446.7037T1-35.565T2-66.561T3
-0.10361R2+0.00603L2+298.7148T1 2+81.5567T2 2+7.8474T3 2
+0.03276RL-4.18929RT1-0.70067RT2+0.91359RT3+3.3045LT1
+1.5565T2+0.1896LT3-242.465T1T2+72.312T1T3-3.7884T2T3
Biomimetic features energy-absorption box is than energy-absorbing ESEAResponse surface model are as follows:
ESEA=107038.24+953.075R-1764.637L-837.368T1-55498.556T2
-59025.06T3+17.861R2+14.003L2+7491.3603T1 2+18066.29T2 2
+14280.959T3 2-10.0727RL-971.812RT1+146.343RT2-32.0797RT3
-125.83LT1+247T2+313.7LT3-10333T1T2+3379.7T1T3+15945T2T3
Cactus biomimetic features energy-absorption box multiple-objection optimization mathematical model in step 4) are as follows:
Those skilled in the art can understand that unless otherwise defined, all terms used herein (including skill
Art term and scientific term) there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Also
It should be understood that those terms such as defined in the general dictionary should be understood that have in the context of the prior art
The consistent meaning of meaning will not be explained in an idealized or overly formal meaning and unless defined as here.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not limited to this hair the foregoing is merely a specific embodiment of the invention
Bright, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (9)
1. a kind of cactus biomimetic features energy-absorption box, which is characterized in that comprising be sequentially connected front box body, middle part box body and after
Portion's box body；
The front box body and automobile front beam crossbeam are connected, and rear portion box body and automobile buffer beam are connected；
The front box body, middle part box body, rear portion box body are in hexagonal star-shape, include 12 rectangular side panels, and 12
Six interior dog-ears and six outer dog-ears are formed between rectangular side panels；Six interior dog-ears and six outer dog-ears are rounded corner；
The length for enabling intersection between rectangular side panels and its adjacent rectangle side plate is the length of the rectangular side panels, rectangular side panels perpendicular to the friendship
The length on the side of line is the width of rectangular side panels；
The front box body, middle part box body, the width of rectangular side panels is equal in the box body of rear portion；
The length of rectangular side panels is greater than the length of rectangular side panels in the box body of front and is less than in the box body of middle part in the rear portion box body
The length of rectangular side panels；
The thickness of rectangular side panels is greater than the thickness of rectangular side panels in the box body of front and is less than in the box body of rear portion in the middle part box body
The thickness of rectangular side panels.
2. cactus biomimetic features energy-absorption box according to claim 1, which is characterized in that six outer dog-ears and six
The range of infolding angular radius is 0-6mm, and the range of the interior dog-ear angle is 30-100 degree.
3. cactus biomimetic features energy-absorption box according to claim 1, which is characterized in that the front box body, middle part box
The range of the width of rectangular side panels is 30-40mm in body, rear portion box body.
4. cactus biomimetic features energy-absorption box according to claim 1, which is characterized in that the front box body, middle part box
The ratio of the length of rectangular side panels is 1:3:2 in body, rear portion box body.
5. cactus biomimetic features energy-absorption box according to claim 1, which is characterized in that the front box body rectangular side panels
The range of thickness be 0.5-0.7mm, the range of the thickness of the middle part box body rectangular side panels is 0.7-0.9mm, the rear portion
The range of the thickness of box body rectangular side panels is 0.9-1.1mm.
6. the optimization method based on cactus biomimetic features energy-absorption box described in claim 1, which is characterized in that including following step
It is rapid:
Step 1) chooses optimal Latin hypercube design method in Isight optimization software, in each design for needing to optimize
N group design sample point is uniformly chosen in the preset threshold range of variable parameter, N is greater than 0 natural number, is preset threshold
Value；The design variable parameter for needing to optimize includes width L, the infolding angular radius R of rectangular side panels1, rectangle in leading portion box body
The thickness T of side plate1, the thickness T of rectangular side panels in the box body of middle section2, the thickness T of rectangular side panels in back segment box body3；
Step 2) establishes the CAD of N group cactus biomimetic features energy-absorption box according to the design sample of selection point in Catia software
Model carries out GTD model and grid dividing to it, and be arranged cactus biomimetic features energy-absorption box each section material properties and
Thickness establishes N group low speed collision model in conjunction with rigid wall；
N group low speed collision mode input LS-DYNA is carried out post-processing calculating, touched after simulation analysis structure to peak value by step 3)
It hits power, the total energy-absorbing of biomimetic features energy-absorption box, biomimetic features energy-absorption box quality, compression displacement, average impact, unite than energy-absorbing
Meter calculate, using response phase method building peak value impact force, biomimetic features energy-absorption box quality, compression displacement, than energy-absorbing, mean collisional
The second-order response surface model of power, and calculate the related coefficient and root-mean-square error of the fitting of this five response surface models；
Step 4), using biomimetic features energy-absorption box quality, compression displacement, peak value impact force as constraint condition, with average impact
With than energy-absorbing as optimization aim, with L, R1、T1、T2、T3As optimization design variable, cactus biomimetic features energy-absorption box is constructed
Multiple-objection optimization mathematical model；
Step 5) establishes cactus biomimetic features energy-absorption box multiple-objection optimization mathematical model, using NSGA- in Isight software
II multi-objective optimization algorithm carries out multiple-objection optimization to the design variable of selection, obtains Pareto disaggregation, solves and concentrates from Pareto
Choose one group of optimal solution；And biomimetic features energy-absorption box finite element model and low speed collision model, generation are established according to this group of optimal solution
Enter and carries out post-processing calculating in LS-DYNA, the simulation analysis calculated result of the biomimetic features energy-absorption box after being optimized.
7. the optimization method based on cactus biomimetic features energy-absorption box as claimed in claim 6, which is characterized in that the step 3)
In five response surface models difference it is as follows:
Biomimetic features energy-absorption box impact force peak FmaxResponse surface model are as follows:
The response surface model of biomimetic features energy-absorption box mass M are as follows:
The response surface model of biomimetic features energy-absorption box compression displacement S are as follows:
Biomimetic features energy-absorption box average impact FavResponse surface model are as follows:
Biomimetic features energy-absorption box is than energy-absorbing ESEAResponse surface model are as follows:
8. the optimization method based on cactus biomimetic features energy-absorption box as claimed in claim 7, which is characterized in that the step 4)
In cactus biomimetic features energy-absorption box multiple-objection optimization mathematical model are as follows:
9. the optimization method based on cactus biomimetic features energy-absorption box as claimed in claim 6, which is characterized in that N value is 100.
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