CN106055849A - Suction and energy-storage anti-collision negative poisson's ratio structure automobile frame and design method - Google Patents

Abstract

The invention discloses a suction and energy-storage anti-collision negative poisson's ratio structure automobile frame and a design method. The automobile frame comprises bumpers, girders and beams, wherein the beams are connected with a left longitudinal girder and a right longitudinal girder and are sequentially arranged in the automobile frame enclosed by the front bumper, the rear bumper, the left longitudinal girder and the right longitudinal girder; negative poisson's ratio structure filling cores are arranged in the front bumper and the rear bumper; and the negative poisson's ratio structure filling cores are arranged in the front segments and the rear segments of the left longitudinal girder and the right longitudinal girder separately. By the automobile frame designed by the design method, the special deformation mode and the energy absorption characteristics of the poisson's ratio structure can be utilized in front collision and back collision, so that the energy absorption capability of the automobile frame is improved; passengers are better protected; and the collision resistance of an automobile is improved.

Description

A kind of suction energy storage crashproof negative poisson's ratio construction car vehicle frame and method for designing

Technical field

The invention belongs to automobile chassis system regions, particularly a kind of suction energy storage crashproof negative poisson's ratio construction car vehicle frame And method for designing.

Background technology

At automobile during colliding, before and after automobile frame, parts come in contact with the external world at first, wherein vehicle frame Energy absorption capability be largely fixed the crashworthiness ability of car load, crashworthiness ability is by force to occupant and vehicle key parts Protection has material impact.Meanwhile, automobile frame is the important bearing part of load-carrying vehicle, needs carrying vehicle in vehicle traveling process Deadweight, occupant and the weight of goods, also need to bear different power and moment simultaneously, and car load is put down by the quality of vehicle frame performance Pliable, durability and vibration noise etc. also have important impact.Therefore ensureing that other performances are constant during Vehicle Frame Design In the case of simultaneously improve its energy absorption capability as far as possible, this has important meaning to the development of automobile chassis system regions Justice.

For ensureing the performances such as rigidity and the durability of automobile, orthodox car vehicle frame has the speciality that rigidity is big, is colliding Being less likely to occur conquassation deformation in journey and absorb collision energy, therefore major part collision energy passes to other zero by vehicle frame Part and occupant, cause occupant to be easily subject to serious injury in collision process.More for making vehicle frame absorb in collision process Collision energy, thus reduce occupant and be hurt in collision process, the vehicle frame induction groove of different size and position is applied to vapour In vehicle carriage design.This design makes vehicle frame deform according to the mode set in collision process, can be in collision During significantly improve the rigidity that the energy absorption capability of vehicle frame can keep again bigger, preferably protection after automobile deformed simultaneously Occupant, makes vehicle collision resistant to be obviously improved, and yet with the restriction that deformed region design space is less, vehicle frame is induced The energy absorption capability that groove improves vehicle frame is limited.For evading this restriction, the honeycomb texture such as foamed aluminium is subsequently applied to vehicle frame Design improves the energy absorption of vehicle frame further, although the energy absorption capability that vehicle frame is in collision process obtains Certain lifting, but it is as the more and more higher of automobile driving speed, the automobile frame energy absorption that foamed aluminium is filled improves limited, Still can not meet impingement designed requirement, need to improve further its crashproof ability of suction energy storage.

Summary of the invention

The present invention is directed to the crashproof deficiency limited in one's ability of vehicle frame suction energy storage present in prior art, it is proposed that a kind of suction Power energy storage crashproof negative poisson's ratio construction car vehicle frame and method for designing, thus the suction energy storage that improve raising automobile frame is crashproof Ability, preferably protection occupant and the crash-worthiness of raising automobile.

The present invention adopts the following technical scheme that, a kind of suction energy storage crashproof negative poisson's ratio construction car vehicle frame, including insurance Thick stick, crossbeam and crossbeam, its middle cross beam is connected with left and right side rail, and is arranged in front/rear collision bumper and left and right side rail successively Between the vehicle frame surrounded；What described front bumper was internally installed is front bumper negative poisson's ratio structure filling inner core, insures afterwards What thick stick was internally installed is rear bumper negative poisson's ratio structure filling inner core；What right side rail leading portion was installed is negative pool before right side rail Pine ratio structure filling inner core, what right side rail back segment was installed is negative poisson's ratio structure filling inner core after right side rail, left side rail What leading portion was installed is negative poisson's ratio structure filling inner core before left side rail, and what left side rail back segment was installed is negative pool after left side rail Pine ratio structure filling inner core.

Further, described crossbeam includes first crossbeam, second cross beam, the 3rd crossbeam and the 4th crossbeam.

The invention also discloses the method for designing of a kind of suction energy storage crashproof negative poisson's ratio construction car vehicle frame, step is such as Under,

1) pool is born after negative poisson's ratio structure filling inner core, left side rail before first setting up left side rail in Matlab software Pine ratio is in negative poisson's ratio structure filling after negative poisson's ratio structure filling inner core, right side rail before structure filling inner core, right side rail Core, front bumper negative poisson's ratio structure filling inner core, the parameterized model of rear bumper negative poisson's ratio structure filling inner core, pass through The finite element analysis model of negative poisson's ratio structure filling inner core can be quickly set up in the change of design parameter；

2) by utilizing parameterized model knowledge base to set up left side rail, right side rail, front in SFE-CONCEPT software Bumper, rear bumper, first crossbeam, second cross beam, the 3rd crossbeam, the Full Parameterized model of the 4th crossbeam；

3) recycling mesh auto-generating technique quickly set up left side rail, right side rail, front bumper, rear bumper, First crossbeam, second cross beam, the 3rd crossbeam, the FEM (finite element) model of the 4th crossbeam, and negative poisson's ratio structure before left side rail is filled out Fill after inner core, left side rail negative poisson's ratio structure filling inner core, right side rail before negative poisson's ratio structure filling inner core, right side rail Rear negative poisson's ratio structure filling inner core, front bumper negative poisson's ratio structure filling inner core, rear bumper negative poisson's ratio structure filling The FEM (finite element) model of inner core assembles with it, thus sets up the finite element of suction energy storage crashproof negative poisson's ratio construction car vehicle frame Model, uses negative poisson's ratio structure filling inner core in longitudinal beam and front/rear collision bumper so that it is and orthodox car vehicle frame is effective In conjunction with thus design a kind of new suction energy storage crashproof negative poisson's ratio construction car vehicle frame, automobile head-on crash or after Face collision all to utilize idio-morphosis mode and the EAC of negative poisson's ratio structure, thus can improve automobile frame Energy absorption capability, preferably protection occupant and the crash-worthiness of raising automobile.

Further, described step 2) in Full Parameterized model be to utilize parameterized model knowledge base to set up, Qi Zhongcan Numberization models repository includes cross-section parameterized, parametrization joint, considers the general arrangement of crossbeam, design ginseng in design process Number.

The method for designing of a kind of suction energy storage disclosed by the invention crashproof negative poisson's ratio construction car vehicle frame, also includes as follows Step,

4) by combining Latin Hypercube Sampling method, second order polynomial response surface model method and negative poisson's ratio structure vapour The FEM (finite element) model of vehicle carriage sets up the second order polynomial response surface model of negative poisson's ratio construction car vehicle frame, wherein, sets up two Number K of the minimum EXPERIMENTAL DESIGN point needed for the polynomial response surface model of rank is become by the design of negative poisson's ratio construction car vehicle frame Amount number determines, wherein K=(n+1) * (n+2)/2, and in formula, n is the quantity of negative poisson's ratio construction car Vehicle Frame Design variable, with Shi Caiyong Latin Hypercube Sampling method and second order polynomial response surface model set up the approximate model of vehicle frame makes foundation near More it is uniformly distributed like EXPERIMENTAL DESIGN point needed for model, thus improves the precision of approximate model；

5) after, the precision to second order polynomial response surface model is evaluated；If all meeting requirement, then will approximate mould Type is for next step negative poisson's ratio construction car vehicle frame optimization design；If requirement can not be met, then return previous step to closely It is modified until meeting required precision like model, by application squared correlation coefficient R², relative maximum absolute error RMAE and Tri-kinds of different methods of mean absolute error RAAE relatively are evaluated, and formula is as follows,

$R^2=1-\frac{\underset{i=1}{\overset{q}{\Σ}}{(y_i-{\hat{y}}_i)}^2}{\underset{i=1}{\overset{q}{\Σ}}{(y_i-\stackrel{\‾}{y})}^2}$

$RMAE=\frac{max\{\left|y_i-{\hat{y}}_i\right|,...,\left|y_i-{\hat{y}}_q\right|\}}{\underset{i=1}{\overset{q}{\Σ}}\left|y_i-\stackrel{\‾}{y}\right|/q}$

$RAAE=\frac{\underset{i=1}{\overset{q}{\Σ}}\left|y_i-{\hat{y}}_i\right|}{\underset{i=1}{\overset{q}{\Σ}}\left|y_i-{\stackrel{\‾}{y}}_i\right|}$

In formula, y_iThe measured value being in response to,The predictive value being in response to,Being in response to the meansigma methods of measured value, q is

In error analysis, the test for modelling verification is counted；

6), after meeting required precision, multi-objective particle swarm algorithm is utilized to be optimized for different design objects, it is thus achieved that Objective design disaggregation, utilizes the Full Parameterized model of negative poisson's ratio construction car vehicle frame quickly to set up knot according to optimizing solution simultaneously The FEM (finite element) model of structure, thus be analyzed optimizing disaggregation and verify, such method can realize different multiple target Automobile The fast optimal design of frame and checking, farthest improved by the optimization of vehicle frame thickness and negative poisson's ratio planform parameter The crashproof ability of suction energy storage of automobile frame.

Accompanying drawing explanation

Fig. 1 is that schematic diagram arranged by negative poisson's ratio construction car vehicle frame of the present invention.

Fig. 2 is the design flow diagram of the present invention.

Wherein 1-front bumper negative poisson's ratio structure filling inner core, 2-front bumper, negative poisson's ratio knot before 3 right side rails Structure fills inner core, 4-first crossbeam, the right side rail of 5-, 6-second cross beam, 7-the 3rd crossbeam, 8-the 4th crossbeam, the right side rail of 9- Rear negative poisson's ratio structure filling inner core, 10-rear bumper, 11-rear bumper negative poisson's ratio structure filling inner core, a 12-left side is vertical big Negative poisson's ratio structure filling inner core after beam, the left side rail of 13-, negative poisson's ratio structure filling inner core before the left side rail of 14-.

Detailed description of the invention

The present invention is described in more detail with detailed description of the invention below in conjunction with the accompanying drawings.

As it is shown in figure 1, a kind of suction energy storage crashproof negative poisson's ratio construction car vehicle frame disclosed by the invention, including forward and backward Bumper, left and right side rail and crossbeam, its middle cross beam includes first crossbeam 4, second cross beam the 6, the 3rd crossbeam 7 and the 4th Crossbeam 8, crossbeam is connected with left and right side rail, and is arranged in the car that forward and backward bumper is surrounded with left and right side rail successively Between frame；Negative poisson's ratio structure filling inner core is had at front bumper 2 and the internally installed of rear bumper 10；Right side rail 5 with And the inside of section is respectively mounted negative poisson's ratio structure filling inner core before and after left side rail 13；It is specially front bumper negative poisson's ratio knot Structure is filled inner core 1 and is arranged in front bumper 2, and rear bumper negative poisson's ratio structure filling inner core 11 is arranged on rear bumper 10 In；Before right side rail, negative poisson's ratio structure filling inner core 3 is arranged on the inside of right side rail 5 leading portion, negative Poisson after right side rail The inside of right side rail 5 back segment it is separately mounted to, negative poisson's ratio structure filling inner core 14 before left side rail than structure filling inner core 9 It is arranged on the inside of left side rail 13 leading portion, after negative poisson's ratio structure filling inner core 12 is arranged on left side rail 13 after left side rail The inside of section, wherein negative poisson's ratio structure filling inner core is made up of the negative poisson's ratio structure cellular with axially symmetric structure, its yuan Born of the same parents are made up of cell wall and cell, and cell wall is divided into cell wall, middle cell wall and lower cell wall.

As in figure 2 it is shown, the method for designing of a kind of suction energy storage of the present invention crashproof negative poisson's ratio construction car vehicle frame, Specifically comprise the following steps that

1) arranging a length of 12.7mm of upper cell wall of negative poisson's ratio structure cellular, thickness is 1.2mm, and width is 1.5mm；In The a length of 14.5mm of cell wall, thickness is 1.2mm, and width is 1.5mm；The lower a length of 15.6mm of cell wall, thickness is 1.2mm, width For 1.5mm；Angle design between upper cell wall and middle cell wall is 55 °；Angle design between middle cell wall and lower cell wall is 125 °, then Negative poisson's ratio structure filling after negative poisson's ratio structure filling inner core 14, left side rail is set up before left side rail in Matlab software Negative poisson's ratio structure filling inner core 9, front insurance after negative poisson's ratio structure filling inner core 3, right side rail before inner core 12, right side rail Thick stick negative poisson's ratio structure filling inner core 1, the parameterized model of rear bumper negative poisson's ratio structure filling inner core 11；

2) utilize parameterized model knowledge base, SFE CONCEPT software is set up left side rail 13, right side rail 5, front Bumper 2, rear bumper 10, first crossbeam 4, the Full Parameterized model of second cross beam the 6, the 3rd crossbeam the 7, the 4th crossbeam 8,

3) recycling mesh auto-generating technique is quickly set up left side rail 13, right side rail 5, front bumper 2, is insured afterwards Thick stick 10, first crossbeam 4, the FEM (finite element) model of second cross beam the 6, the 3rd crossbeam the 7, the 4th crossbeam 8, and by Poisson negative before left side rail Than negative poisson's ratio structure filling before negative poisson's ratio structure filling inner core 12, right side rail after structure filling inner core 14, left side rail Negative poisson's ratio structure filling inner core 9, front bumper negative poisson's ratio structure filling inner core 1, rear bumper after inner core 3, right side rail The FEM (finite element) model of negative poisson's ratio structure filling inner core 11 assembles with it, thus sets up suction energy storage crashproof negative poisson's ratio knot The FEM (finite element) model of structure automobile frame.

For reducing the amount of calculation of model and improving the accuracy of model as far as possible, by combining Latin Hypercube Sampling side The FEM (finite element) model of method, second order polynomial response surface model method and negative poisson's ratio construction car vehicle frame sets up negative poisson's ratio structure The second order polynomial response surface model of automobile frame, wherein, sets up the minimum test needed for second order polynomial response surface model Number K of design point is determined by the design variable number of negative poisson's ratio construction car vehicle frame, wherein K=(n+1) * (n+2)/2, formula In, n is the quantity of negative poisson's ratio construction car Vehicle Frame Design variable；Wherein, the design variable of negative poisson's ratio construction car vehicle frame Number is 12, then setting up number K of the minimum EXPERIMENTAL DESIGN point needed for second order polynomial response surface model and can trying to achieve is 91 Individual

Afterwards the precision of second order polynomial response surface model is evaluated, by application squared correlation coefficient R², relatively Tri-kinds of different methods of maximum absolute error RMAE and relative mean absolute error RAAE are evaluated, and formula is as follows,

$R^2=1-\frac{\underset{i=1}{\overset{q}{\Σ}}{(y_i-{\hat{y}}_i)}^2}{\underset{i=1}{\overset{q}{\Σ}}{(y_i-\stackrel{\‾}{y})}^2}$

$RMAE=\frac{max\{\left|y_i-{\hat{y}}_i\right|,...,\left|y_i-{\hat{y}}_q\right|\}}{\underset{i=1}{\overset{q}{\Σ}}\left|y_i-\stackrel{\‾}{y}\right|/q}$

$RAAE=\frac{\underset{i=1}{\overset{q}{\Σ}}\left|y_i-{\hat{y}}_i\right|}{\underset{i=1}{\overset{q}{\Σ}}\left|y_i-{\stackrel{\‾}{y}}_i\right|}$

Result according to formula gained is: squared correlation coefficient R²Being 99.05%, relative maximum absolute error RMAE is 0.0512, relative mean absolute error RAAE is 0.0237, all meets requirement, then approximate model is used for next step negative Poisson Design than construction car vehicle frame optimization

Multi-objective particle swarm algorithm is utilized to be optimized for different design objects, it is thus achieved that objective design disaggregation, with The FEM (finite element) model of structure quickly set up by the Full Parameterized model of Shi Liyong negative poisson's ratio construction car vehicle frame according to optimizing solution, from And be analyzed optimizing disaggregation and verify, checking structure is effective.

The application approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention, it is noted that for this For the those of ordinary skill of technical field, under the premise without departing from the principles of the invention, it is also possible to make some improvement, these Improve and also should be regarded as protection scope of the present invention.

Claims (5)

1. a suction energy storage crashproof negative poisson's ratio construction car vehicle frame, including forward and backward bumper, left and right crossbeam and crossbeam, It is characterized in that, crossbeam is connected with left and right side rail, and is arranged in forward and backward bumper successively and is surrounded with left and right side rail Vehicle frame between；Front bumper (2) internally installed front bumper negative poisson's ratio structure filling inner core (1), rear bumper (10) is internal Rear bumper negative poisson's ratio structure filling inner core (11) is installed；Right side rail (5) leading portion installs negative poisson's ratio knot before right side rail Structure fills inner core (3), and right side rail (5) back segment installs negative poisson's ratio structure filling inner core (9) after right side rail, left side rail (13) negative poisson's ratio structure filling inner core (14) before leading portion installs left side rail, after left side rail (13) back segment installs left side rail Negative poisson's ratio structure filling inner core (12).

Suction energy storage the most according to claim 1 crashproof negative poisson's ratio construction car vehicle frame, it is characterised in that crossbeam includes First crossbeam (4), second cross beam (6), the 3rd crossbeam (7) and the 4th crossbeam (8).

3. the method for designing of a suction energy storage crashproof negative poisson's ratio construction car vehicle frame, it is characterised in that step is as follows:

1) pool is born after negative poisson's ratio structure filling inner core (14), left side rail before first setting up left side rail in Matlab software Pine is than negative poisson's ratio structure after negative poisson's ratio structure filling inner core (3), right side rail before structure filling inner core (12), right side rail Fill inner core (9), front bumper negative poisson's ratio structure filling inner core (1), rear bumper negative poisson's ratio structure filling inner core (11) Parameterized model；

2) by utilizing parameterized model knowledge base to set up left side rail (13), right side rail in SFE CONCEPT software (5), front bumper (2), rear bumper (10), first crossbeam (4), second cross beam (6), the 3rd crossbeam (7), the 4th crossbeam (8) Full Parameterized model；

3) recycling mesh auto-generating technique is quickly set up left side rail (13), right side rail (5), front bumper (2), is protected afterwards Danger thick stick (10), first crossbeam (4), second cross beam (6), the 3rd crossbeam (7), the FEM (finite element) model of the 4th crossbeam (8), and a left side is indulged Before crossbeam after negative poisson's ratio structure filling inner core (14), left side rail before negative poisson's ratio structure filling inner core (12), right side rail Negative poisson's ratio structure filling inner core (9), front bumper negative poisson's ratio knot after negative poisson's ratio structure filling inner core (3), right side rail Structure fills inner core (1), the FEM (finite element) model of rear bumper negative poisson's ratio structure filling inner core (11) assembles with it, thus builds The FEM (finite element) model of vertical suction energy storage crashproof negative poisson's ratio construction car vehicle frame.

Suction energy storage the most according to claim 3 crashproof negative poisson's ratio construction car Vehicle Frame Design method, it is characterised in that Described step 2) in Full Parameterized model be to utilize parameterized model knowledge base to set up, wherein parameterized model knowledge base bag Include cross-section parameterized, parametrization joint, design process considers the general arrangement of crossbeam, design parameter.

Suction energy storage the most according to claim 3 crashproof negative poisson's ratio construction car Vehicle Frame Design method, it is characterised in that Also comprise the steps:

4) by combining Latin Hypercube Sampling method, second order polynomial response surface model method and negative poisson's ratio construction car car The FEM (finite element) model of frame sets up the second order polynomial response surface model of negative poisson's ratio construction car vehicle frame, wherein, sets up second order many Number K of the minimum EXPERIMENTAL DESIGN point needed for item formula response surface model is by the design variable of negative poisson's ratio construction car vehicle frame Number determines, wherein K=(n+1) * (n+2)/2, in formula, n is the quantity of negative poisson's ratio construction car Vehicle Frame Design variable；

5) after, the precision to second order polynomial response surface model is evaluated；If all meeting requirement, then approximate model is used Negative poisson's ratio construction car vehicle frame optimization in next step designs；If requirement can not be met, then return previous step pairing approximation mould Type is modified until meeting required precision, by application squared correlation coefficient R², relative maximum absolute error RMAE is with relative Tri-kinds of different methods of mean absolute error RAAE are evaluated, and formula is as follows,

$R^2=1-\frac{\underset{i=1}{\overset{q}{\Σ}}{(y_i-{\hat{y}}_i)}^2}{\underset{i=1}{\overset{q}{\Σ}}{(y_i-\stackrel{\‾}{y})}^2}$

$RMAE=\frac{\max \left\{\right|y_i-{\hat{y}}_i|,...,|y_i-{\hat{y}}_q\left|\right\}}{\underset{i=1}{\overset{q}{\Σ}}|y_i-\stackrel{\‾}{y}|/q}$

$RAAE=\frac{\underset{i=1}{\overset{q}{\Σ}}|y_i-{\hat{y}}_i|}{\underset{i=1}{\overset{q}{\Σ}}|y_i-\stackrel{\‾}{y}|}$

In formula, y_iThe measured value being in response to,The predictive value being in response to,Being in response to the meansigma methods of measured value, q is in error analysis Test for modelling verification is counted；

6), after meeting required precision, multi-objective particle swarm algorithm is utilized to be optimized for different design objects, it is thus achieved that many mesh Mark design disaggregation, utilizes the Full Parameterized model of negative poisson's ratio construction car vehicle frame quickly to set up structure according to optimizing solution simultaneously FEM (finite element) model, thus be analyzed optimizing disaggregation and verify.