CN209813688U - Car door anti-collision beam based on negative Poisson ratio structure - Google Patents
Car door anti-collision beam based on negative Poisson ratio structure Download PDFInfo
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- CN209813688U CN209813688U CN201920268124.6U CN201920268124U CN209813688U CN 209813688 U CN209813688 U CN 209813688U CN 201920268124 U CN201920268124 U CN 201920268124U CN 209813688 U CN209813688 U CN 209813688U
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Abstract
The utility model discloses a door anticollision roof beam based on negative poisson ratio structure contains the casing and fills the inner core, and it forms to fill the inner core based on interior concave hexagon negative poisson ratio structural design. The utility model also discloses a deterministic optimization design method based on crashworthiness and lightweight, this method fully considers the randomness and the volatility of design variable, designs the parameter of the negative poisson's ratio structure of shell thickness and packing inner core, has effectively promoted the energy-absorbing effect in the side impact, guarantees passenger's safety in the car and realizes the lightweight of spare part.
Description
Technical Field
The utility model relates to a passive safety protection field of car especially relates to a door anticollision roof beam based on negative poisson's ratio structure.
Background
Automobile side pillar collisions are a common form of traffic accident. In the side column collision, the casualty rate of passengers is high due to the fact that the rigidity of the column is high, the area impacted is small, the structure of the impacted area is weak, and the energy absorption and buffering space is small. Therefore, the impact resistance of the door impact beam of the automobile must be given sufficient attention in the automobile design process. At present, the methods for improving the crashworthiness of the vehicle door anti-collision beam generally adopt materials with higher strength, increase the thickness of the materials and the like, but simultaneously cause the increase of the production cost and the increase of the servicing quality. On the premise of not reducing the collision safety performance of the side column of the automobile, the mass of the automobile is effectively reduced, and a new idea is needed to be explored to improve the design of the automobile door anti-collision beam.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to mention not enough in the background art, provide a door anticollision roof beam based on negative poisson's ratio structure and design method thereof.
The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:
a vehicle door anti-collision beam based on a negative Poisson ratio structure is disclosed, wherein a vehicle door comprises a vehicle door outer plate and a vehicle door inner plate, wherein the edges of the vehicle door outer plate and the vehicle door inner plate are fixedly connected with each other, and the vehicle door outer plate is protruded towards the direction far away from the vehicle door inner plate and is matched with the vehicle door outer plate to form a shell with a gap;
the vehicle door anti-collision beam comprises a shell and a filling inner core, is arranged in a gap between a vehicle door outer plate and a vehicle door inner plate, and is fixedly connected with the vehicle door inner plate;
the shell is in a hollow tubular shape and is made of an aluminum alloy material;
the filling inner core is filled in the shell, is made of a material with a negative Poisson ratio, is used for absorbing energy when a side collision occurs to the automobile, and is connected with the shell in an adhesive mode.
As a further optimization scheme of the vehicle door anti-collision beam based on the negative Poisson ratio structure, the cross section of the shell is an inwards concave hexagon and comprises a top edge, a bottom edge and four bevel edges, wherein the top edge is parallel to the bottom edge, the height between the top edge and the bottom edge is 73.5mm, the length of the bottom edge is 57.378mm, the lengths of the four bevel edges are 23.104mm, and the included angle between the bottom edge and the bevel edge is 60 degrees;
the length of casing is 340mm, and the wall thickness is 1 mm.
As a further optimization scheme of the vehicle door anti-collision beam based on the negative Poisson ratio structure, the filling inner core is composed of seven layers of negative Poisson ratio single cell structure arrays;
the negative Poisson ratio single cell structure is in a concave hexagon and comprises a top edge, a bottom edge and four oblique edges, wherein the top edge and the bottom edge are parallel, the height between the top edge and the bottom edge is 8mm, the length of the bottom edge is 12mm, the included angle between the bottom edge and the oblique edges is 60 degrees, and the thickness is 0.5 mm.
The utility model also discloses an optimization method of this door anticollision roof beam based on negative poisson's ratio structure, including following step:
step 1), in order to find the vehicle door anti-collision beam structure with the best crashworthiness and reliability, the thickness T of the shell is selected1Length L of bottom side of unit cell structure of sandwich layer, thickness T of unit cell structure2The included angle D between the bottom edge and the bevel edge is used as a design variable, and 100 values are individually selected from each design variable within a preset threshold range through an optimal Latin hypercube test design method to form 100 groups of design sample points;
step 2), carrying out parametric modeling in Catia software according to the 100 groups of sample points obtained in the step 1), introducing the sample points into Hypermesh, assembling the sample points with the car door, and establishing a side column collision model;
step 3), inputting 100 groups of side column collision models into LS-DYNA for post-processing calculation, taking the minimization of the mass M of the vehicle door anti-collision beam as a design target according to a preset evaluation standard of the vehicle door anti-collision beam, taking the intrusion amount of a vehicle door inner plate corresponding to the position of a pelvis of a driver not to exceed 320mm, taking the average collision force MCF of the vehicle door and a rigid column not to exceed 115.5kN as a constraint condition, establishing a second-order response surface model of the mass, the intrusion amount and the average collision force of the vehicle door anti-collision beam by using a response surface method, and calculating the fitted correlation coefficients and the root mean square error of the three response surface models;
and 4) establishing a multi-objective optimization mathematical model of the vehicle door anti-collision beam in Isight software, and performing deterministic optimization on the vehicle door anti-collision beam structure by using a particle swarm optimization algorithm to obtain an optimization result.
The utility model adopts the above technical scheme to compare with prior art, have following technological effect:
1. the utility model provides a vehicle door anti-collision beam based on a negative Poisson ratio structure, which effectively solves the defects of larger deformation, poor energy absorption effect and the like of the vehicle door anti-collision beam in the side column collision process;
2. and the particle swarm optimization algorithm is adopted to carry out deterministic optimization design on the vehicle door anti-collision beam based on the negative Poisson's ratio structure, so that the energy absorption characteristic of the anti-collision beam is further improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic view of the inner core of the present invention;
fig. 3 is a schematic view of the cross-sectional structure of the middle shell of the present invention.
In the figure, 1-shell, 2-filled core.
Detailed Description
The technical scheme of the utility model is further explained in detail with the attached drawings as follows:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
As shown in fig. 1, the utility model discloses a door anti-collision beam based on a negative poisson's ratio structure, the door comprises a door outer plate and a door inner plate, wherein, the edges of the door outer plate and the door inner plate are fixedly connected with each other, and the door outer plate is convex towards the direction far away from the door inner plate, and is matched to form a shell with a gap;
the vehicle door anti-collision beam comprises a shell and a filling inner core, is arranged in a gap between a vehicle door outer plate and a vehicle door inner plate, and is fixedly connected with the vehicle door inner plate;
the shell is in a hollow tubular shape and is made of an aluminum alloy material;
as shown in fig. 2, the filling inner core is filled in the shell, is made of a material with a negative poisson ratio, is used for absorbing energy when a side collision occurs to the automobile, and is connected with the shell in an adhesive mode.
As shown in fig. 3, the cross section of the shell is a concave hexagon and comprises a top edge, a bottom edge and four oblique edges, wherein the top edge and the bottom edge are parallel, the height between the top edge and the bottom edge is 73.5mm, the length of the bottom edge is 57.378mm, the lengths of the four oblique edges are 23.104mm, and the included angle between the bottom edge and the oblique edges is 60 degrees;
the length of casing is 340mm, and the wall thickness is 1 mm.
The filling inner core is composed of seven layers of negative Poisson's ratio unit cell structure arrays;
the negative Poisson ratio single cell structure is in a concave hexagon and comprises a top edge, a bottom edge and four oblique edges, wherein the top edge and the bottom edge are parallel, the height between the top edge and the bottom edge is 8mm, the length of the bottom edge is 12mm, the included angle between the bottom edge and the oblique edges is 60 degrees, and the thickness is 0.5 mm.
The utility model also discloses an optimization method of this door anticollision roof beam based on negative poisson's ratio structure, including following step:
step 1), in order to find the vehicle door anti-collision beam structure with the best crashworthiness and reliability, the thickness T of the shell is selected1Length L of bottom side of unit cell structure of sandwich layer, thickness T of unit cell structure2The included angle D between the bottom edge and the bevel edge is used as a design variable, and 100 values are individually selected from each design variable within a preset threshold range through an optimal Latin hypercube test design method to form 100 groups of design sample points;
step 2), carrying out parametric modeling in Catia software according to the 100 groups of sample points obtained in the step 1), introducing the sample points into Hypermesh, assembling the sample points with the car door, and establishing a side column collision model;
step 3), inputting 100 groups of side column collision models into LS-DYNA for post-processing calculation, taking the minimization of the mass M of the vehicle door anti-collision beam as a design target according to a preset evaluation standard of the vehicle door anti-collision beam, taking the intrusion amount of a vehicle door inner plate corresponding to the position of a pelvis of a driver not to exceed 320mm, taking the average collision force MCF of the vehicle door and a rigid column not to exceed 115.5kN as a constraint condition, establishing a second-order response surface model of the mass, the intrusion amount and the average collision force of the vehicle door anti-collision beam by using a response surface method, and calculating the fitted correlation coefficients and the root mean square error of the three response surface models;
and 4) establishing a multi-objective optimization mathematical model of the vehicle door anti-collision beam in Isight software, and performing deterministic optimization on the vehicle door anti-collision beam structure by using a particle swarm optimization algorithm to obtain an optimization result.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A vehicle door anti-collision beam based on a negative Poisson ratio structure is disclosed, wherein a vehicle door comprises a vehicle door outer plate and a vehicle door inner plate, wherein the edges of the vehicle door outer plate and the vehicle door inner plate are fixedly connected with each other, and the vehicle door outer plate is protruded towards the direction far away from the vehicle door inner plate and is matched with the vehicle door outer plate to form a shell with a gap;
the anti-collision beam for the vehicle door is characterized by comprising a shell and a filling inner core, wherein the shell and the filling inner core are arranged in a gap between a vehicle door outer plate and a vehicle door inner plate and are fixedly connected with the vehicle door inner plate;
the shell is in a hollow tubular shape and is made of an aluminum alloy material;
the filling inner core is filled in the shell, is made of a material with a negative Poisson ratio, is used for absorbing energy when a side collision occurs to the automobile, and is connected with the shell in an adhesive mode.
2. The negative poisson's ratio structure-based vehicle door impact beam of claim 1, wherein the cross section of the shell is a concave hexagon comprising a top edge, a bottom edge and four oblique edges, wherein the top edge and the bottom edge are parallel, the height between the top edge and the bottom edge is 73.5mm, the length of the bottom edge is 57.378mm, the length of each of the four oblique edges is 23.104mm, and the included angle between the bottom edge and the oblique edges is 60 degrees;
the length of casing is 340mm, and the wall thickness is 1 mm.
3. The negative poisson's ratio structure-based vehicle door impact beam of claim 1, wherein the filler core is comprised of seven layers of an array of negative poisson's ratio unit cell structures;
the negative Poisson ratio single cell structure is in a concave hexagon and comprises a top edge, a bottom edge and four oblique edges, wherein the top edge and the bottom edge are parallel, the height between the top edge and the bottom edge is 8mm, the length of the bottom edge is 12mm, the included angle between the bottom edge and the oblique edges is 60 degrees, and the thickness is 0.5 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920268124.6U CN209813688U (en) | 2019-03-04 | 2019-03-04 | Car door anti-collision beam based on negative Poisson ratio structure |
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| CN201920268124.6U CN209813688U (en) | 2019-03-04 | 2019-03-04 | Car door anti-collision beam based on negative Poisson ratio structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109808468A (en) * | 2019-03-04 | 2019-05-28 | 南京航空航天大学 | A kind of door anti-collision joist and its optimization method based on negative poisson's ratio structure |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109808468A (en) * | 2019-03-04 | 2019-05-28 | 南京航空航天大学 | A kind of door anti-collision joist and its optimization method based on negative poisson's ratio structure |
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