CN102567552A - Method for realizing optimization of vehicle body structure on basis of normal rigidity analysis of metal plates of vehicle body - Google Patents
Method for realizing optimization of vehicle body structure on basis of normal rigidity analysis of metal plates of vehicle body Download PDFInfo
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- CN102567552A CN102567552A CN2010105901650A CN201010590165A CN102567552A CN 102567552 A CN102567552 A CN 102567552A CN 2010105901650 A CN2010105901650 A CN 2010105901650A CN 201010590165 A CN201010590165 A CN 201010590165A CN 102567552 A CN102567552 A CN 102567552A
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Abstract
The invention relates to a method for realizing optimization of a vehicle body structure on the basis of normal rigidity analysis of metal plates of a vehicle body, which includes: acquiring rigidity matrix (K) of nodes of the vehicle body by performing finite element computing and processing, acquiring a shift matrix (U) of the nodes of the vehicle body according to a formula (U)=(K)-1(F), setting the (F) as a force matrix formed by force applied on each node of the vehicle body and a (K)-1 as an inverse matrix of the rigidity matrix (K); projecting the inverse matrix (K)-1 to the normal direction of the nodes of the vehicle body so as to acquire the inverse matrix (Kn)-1 of the normal rigidity matrix (Kn) of the nodes of the vehicle body, and acquiring a normal shift matrix (Un) of the nodes of the vehicle body according to a formula (Un)=(Kn)-1; converting the acquired normal shift matrix (Un) into the format which can be identified by finite element post-processing software, importing the finite element post-processing software to display a normal shift cloud map of the nodes of the vehicle body; and determining the weak area of rigidity of the metal plates of the vehicle body according to the display result of the normal shift cloud map of the nodes of the vehicles so as to optimize the vehicle body structure conveniently. By the method for realizing optimization of the vehicle body structure on the basis of normal rigidity analysis of the metal plates of the vehicle body, the technical scheme of optimization of the vehicle body can be effectively provided and implemented, and the defects of waste and consumption and the like in the prior art are overcome.
Description
[technical field]
The present invention relates to a kind of method that realizes that body structure is optimized, relate in particular to a kind of method that realizes body structure optimization based on the analysis of vehicle body panel beating normal stiffness.
[background technology]
In existing body structure design, seldom consider the normal stiffness harmony radiation characteristic of vehicle body panel beating, and do not have ready-made application software to carry out the calculating of this respect.For example; Be CN101718630A at publication number, be entitled as in the patent documentation of " vehicle door interior trim panel knocker and confirm the method for vehicle door interior trim panel rigidity value "; It provides a kind of and based on knocker the kinetic parameter in each regional impact process of trim panel has been obtained rigidity value to optimize the method for trim panel structure, does not carry out any analyzing and processing but in the document, disclose to the normal stiffness characteristic of trim panel structure.And for example; Be CN1815229 at publication number, be entitled as to disclose in the patent documentation of " a kind of method of predicting automobile skin-surface damp-treatment structure acoustic radiation " and a kind ofly at first the automobile skin-surface damp Processing Structure carried out finite element modeling, carried out the method for sound radiation analytical calculation then; To solve the sound radiation forecasting problem after the body structure surface damping is handled thus, equally do not relate to analysis, the calculation processes of structure normal stiffness aspect in the method yet.
In addition; In the prior art; Designing treatment for the vehicle body damping is often fully rule of thumb carried out, and existing software does not provide the function of this respect yet, and this just makes can not really provide and implement the damping prioritization scheme of science effectively; Thereby caused the unnecessary waste of aspects such as material, manpower and man-hour, also be unfavorable for having simultaneously the realization of the target of real positive effect such as vehicle lightweight, fuel consume economization and high efficiency, low-carbon (LC), low consumption etc.
[summary of the invention]
In view of this; The object of the present invention is to provide a kind of method that realizes body structure optimization based on the analysis of vehicle body panel beating normal stiffness; So that come effectively to confirm vehicle body panel beating rigidity weak area through the normal stiffness characteristic of quick evaluation vehicle body panel beating; In the rigidity weak area, take to be provided with measures such as reinforcement, stickup damping pad then pointedly and optimize body structure, thereby solve the problems referred to above that exist in the prior art.
For realizing the foregoing invention purpose, the technical scheme that the present invention adopts is following:
A kind of method of optimizing based on vehicle body panel beating normal stiffness analysis realization body structure, it may further comprise the steps:
A, handle to obtain the stiffness matrix [K] of vehicle body node through carrying out FEM calculation, and through formula [U]=[K]
-1[F] obtains the transposed matrix [U] of vehicle body node, and wherein [F] is for acting on the moment battle array of the power composition on each vehicle body node, [K]
-1It is the inverse matrix of said stiffness matrix [K];
B, with said inverse matrix [K]
-1Carry out projection to obtain the normal stiffness matrix [K of vehicle body node to the normal orientation of vehicle body node
n] inverse matrix [K
n]
-1, and through formula [U
n]=[K
n]
-1Obtain the normal direction transposed matrix [U of vehicle body node
n], said normal stiffness is meant the rigidity of the normal orientation of the node on the vehicle body sheet metal structural, is the ratio in the normal orientation power that applies and the normal direction displacement that produced by this power effect of this node;
C, the said normal direction transposed matrix [U that will obtain
n] converting to can be by the form of finite element the poster processing soft identification, and import the normal direction displacement cloud atlas that the finite element the poster processing soft shows the vehicle body node; And
D, confirm that according to the display result of the normal direction displacement cloud atlas of said vehicle body node vehicle body panel beating rigidity weak area is so that carry out the body structure optimization process.
Realize preferably, finding the solution said inverse matrix [K among the said step B in the method for body structure optimization based on the analysis of vehicle body panel beating normal stiffness above-mentioned
n]
-1Step specifically comprise:
B1, in the normal vector of vehicle body node, utilize node coordinate to solve the vector v of any two intersection edges of a shell unit
1=(x
2-x
1, y
2-y
1) and v
2=(x
3-x
1, y
3-y
1), (x wherein
1, y
1) be vector v
1And v
2The joining coordinate, (x
2, y
2) be vector v
1Other end point coordinate, (x
3, y
3) be vector v
2Other end point coordinate;
B2, compute vector v
1And v
2Cross product, thereby obtain the normal vector of said shell unit
B3, repeating step b1-b2, thus the normal vector s of another shell unit adjacent obtained with said shell unit
2
B4, calculating normal vector s
1With s
2Dot product, thereby obtain the normal vector v of first node
n=s
1S
2And
B5, repeating step b1-b4, thereby the normal vector matrix [v of acquisition vehicle body node
n], and through formula [K
n]
-1=[K]
-1[v
n] obtain said inverse matrix [K
n]
-1
Above-mentioned realizing in the method for body structure optimization based on the analysis of vehicle body panel beating normal stiffness, preferably, the body structure optimization process among the said step D is included in rigidity reinforcement structure and/or damped part is set in the said vehicle body panel beating rigidity weak area.
Realize that based on the analysis of vehicle body panel beating normal stiffness preferably, said damped part is the damping pad in the method for body structure optimization above-mentioned.
Realize that based on the analysis of vehicle body panel beating normal stiffness preferably, said damping pad is secured in the said vehicle body panel beating rigidity weak area in the method for body structure optimization above-mentioned.
Beneficial effect of the present invention is: through adopting the method that realizes body structure optimization based on the analysis of vehicle body panel beating normal stiffness of the present invention; Can be based on the zone that need be optimized in the definite apace vehicle body sheet metal structural of panel beating normal stiffness analysis; Through analytical Calculation and general finite element software are combined and can estimate the stiffness characteristics of vehicle body panel beating convenient and swift, intuitively; And can really provide and implement the body structure prioritization scheme of science thus effectively; Thereby what exist in the elimination prior art expends drawbacks such as unnecessary material, manpower and man-hour; Help to realize useful targets such as vehicle lightweight, raising fuel economy, reduction carbon emission amount, to create more society and economic benefit.
[description of drawings]
Below with reference to accompanying drawing and embodiment, technical scheme of the present invention is described in further detail.Wherein:
Fig. 1 is the vehicle body panel beating node normal stiffness synoptic diagram that relates in the inventive method;
Fig. 2 is that the shell unit face normal vector that relates in the inventive method is found the solution synoptic diagram;
Fig. 3 is that the vehicle body panel beating node normal vector that relates in the inventive method is found the solution synoptic diagram;
Fig. 4 has demonstrated through using the vehicle body panel beating normal direction displacement cloud atlas that embodiment obtained of the inventive method;
The corresponding respectively normal direction displacement cloud atlas that has demonstrated the preceding coaming plate among Fig. 4, preceding floor, back seat floor, floor, spare tyre cabin, buttock planking and afterbody inner panel of Fig. 5 A-5F;
Fig. 6 A has demonstrated the damping pad optimizing design scheme that provides through the embodiment that uses the inventive method;
Fig. 6 B has demonstrated the damping pad design proposal that adopts traditional approach to provide; And
Fig. 7 adopts the embodiment of the inventive method to carry out the forward and backward pressure response correlation curve figure of human pilot ear of body structure optimization.
[embodiment]
In general; The invention provides a kind of method that realizes that body structure is optimized; It is based on the structure optimization scheme that vehicle body panel beating normal stiffness is analyzed the science of acquisition, handles thereby very targetedly the actual weakness of body structure is carried out effective optimization.Some notions and the term that below will specifically combine Fig. 1-3 to describe in detail to relate among the present invention vehicle body panel beating normal stiffness to analyze and calculate are so that the advantage and the characteristics that can more be expressly understood the present invention and possessed.
See also Fig. 1, the calculating of vehicle body panel beating normal stiffness at first will be described.In this article, vehicle body panel beating normal stiffness is defined as the rigidity of the normal orientation of the node on the vehicle body sheet metal structural, and promptly the normal orientation of a node applies power f on vehicle body sheet metal structural as shown in Figure 1
n, receive power f with this node then
nNormal direction displacement components u after the effect
nAs the output under this operating mode, then the vehicle body panel beating is at the normal stiffness of this node: f
n/ u
n
Yet; For this complication system of vehicle body; If in fact directly to calculate the vehicle body panel beating be suitable difficulty at the normal stiffness of each node to the analytic application method, even if adopt existing finite element software can calculate and export the rigidity of each node, but it is not a normal stiffness yet.In addition, owing in the finite element the poster processing soft, can only demonstrate results such as displacement and stress, and can not directly show node rigidity.But under the unit force effect, rigidity and displacement deformation exist relation reciprocal each other, thus can solve the node normal stiffness earlier, and then solve the normal direction displacement of node.
At first, handle the stiffness matrix [K] that obtains the vehicle body node, can obtain the transposed matrix [U] of each vehicle body node then through following formula (1) through FEM calculation:
[U]＝[K]
-1·[F] (1)
In following formula, the matrix that [F] forms for the power that acts on each vehicle body node supposes that the suffered power of each vehicle body node is unit force, and then solving method just has been converted into the problem of separating the inverse matrix of asking normal stiffness to the problem of transposed matrix.
The displacement that is obtained by above formula (1) is the displacement of stressed node under global coordinate system, and is not the displacement of vehicle body panel beating in the normal orientation of stressed node location.Like this, if obtain normal direction transposed matrix [U
n] just must solving system normal stiffness matrix [K
n] inverse matrix [K
n]
-1, promptly needs will have the inverse matrix [K] of stiffness matrix now
-1Carry out projection to the normal orientation of node and calculate, obtain the normal direction transposed matrix [U of vehicle body node then through following formula (2)
n]:
[U
n]＝[K
n]
-1 (2)
Then, will be through the normal direction transposed matrix [U that above process obtained
n] converting to can be by the form of finite element the poster processing soft identification; And it is imported the normal direction displacement cloud atlas that finite element the poster processing soft demonstrates the vehicle body node; Thereby the display result according to the normal direction displacement cloud atlas of this vehicle body node is confirmed vehicle body panel beating rigidity weak area, so that correspondingly adopt various body structure optimization process measures.
Find the solution inverse matrix [K in above calculating
n]
-1Process in owing to receive the restriction of computational accuracy, use existing finite element software possibly be not easy to export the normal vector of whole nodes.Therefore, in the present invention a kind of preferred Analytic Calculation Method is provided especially also so that can accomplish more quickly and accurately to inverse matrix [K
n]
-1Find the solution, below will combine Fig. 2 and Fig. 3 to specify.
As shown in Figure 2, when the solution node normal vector, can at first utilize the coordinate of node to solve the vector v of any two intersection edges of shell unit 1 through formula (3), (4)
1And v
2, (the x in these formula
1, y
1) be vector v
1And v
2The joining coordinate, (x
2, y
2) be vector v
1Other end point coordinate, (x
3, y
3) be vector v
2Other end point coordinate:
v
1＝(x
2-x
1，y
2-y
1) (3)
v
2＝(x
3-x
1，y
3-y
1) (4)
Then, through type (5) calculates v again
1And v
2Cross product obtain the normal vector s of shell unit 1
1:
Subsequently, adopt the normal vector s that obtains adjacent shell unit 2 in the same way
2As shown in Figure 3, use formula (6) again and find the solution s
1With s
2Dot product, just can obtain the normal vector v of first node
n:
v
n＝s
1·s
2 (6)
Repeat above step, just can obtain the normal vector matrix [v of vehicle body node
n], just can obtain above-mentioned normal stiffness matrix [K through following formula (7) then
n] inverse matrix [K
n]
-1:
[K
n]
-1＝[K]
-1·[v
n] (7)
To come the method based on the optimization of vehicle body panel beating normal stiffness analysis realization body structure of the present invention is carried out exemplary illustrated at length through a concrete example below.
Please refer to Fig. 4; It has demonstrated a vehicle body panel beating normal direction displacement cloud atlas (also can be called vehicle body panel beating normal stiffness cloud atlas) that embodiment obtained in the performance history of one two boxcar type, using the inventive method; In this Fig. 4, illustrate rigidity weakness zone wherein very intuitively, i.e. inclination cross spider fill area among the figure.In addition, more detailed in Fig. 5 A-5F subsequently, be clearly shown that these rigidity weakness zones.In Fig. 5 A-5F; They have correspondingly demonstrated among Fig. 4 the normal direction displacement cloud atlas of preceding coaming plate, preceding floor, back seat floor, floor, spare tyre cabin, buttock planking and afterbody inner panel that usage flag A, B, C, D, E, F respectively indicate; So just can also locate the position that needs are optimized processing exactly, thereby be convenient to provide in view of the above the structure optimization technical scheme of science according to illustrated objective results is directly perceived.
Particularly; Rigidity can be set in the rigidity weak area that is positioned (for example strengthen structure; Adopt the reinforcement of reinforcement or other any suitable shape and structure etc.); Damped part (for example, adopting resistance pad or other any adaptation etc.) also can be set, perhaps combine aforementioned dual mode and other mode to carry out the complex optimum processing simultaneously.
For example, to result shown in Figure 4, can adopt following measure to improve:
The first, to wherein tail-gate inner panel and outside plate carry out the reinforcement processing;
The second, increase the supporting bracket of two gusset rear portion inner panels, to reduce the vibration and sound radiation risk of side-wall outer-plate Background Region to outside plate;
The 3rd; Paste the damping pad after optimizing at the rigidity weakness zone; The size of damping pad is identical or roughly the same with the size of rigidity weakness zone shown in the vehicle body panel beating normal direction displacement cloud atlas, the damping pad optimizing design scheme that the embodiment of the application the inventive method that for example in Fig. 6 A, illustrates provides.
As a comparison, in Fig. 6 B, also show and adopt the damping shield of traditional design mode to put scheme, promptly area more greatly, lay the damping pad on more smooth crew department's panel beating, at for example preceding floor, upper berth, floor, spare tyre cabin full damping pad.The damping pad prioritization scheme (Fig. 6 A) and the traditional design scheme (Fig. 6 B) that relatively provide through the embodiment that uses above-mentioned the inventive method adopt the former can realize weight reduction about 50%.And; Can also find: although parts such as fire wall, wheel cover are the zones that need pay close attention to; Yet lay or need not to lay at all the damping pad through can only carrying out small size to them really behind these zones of vehicle body panel beating normal direction displacement cloud atlas observation; Thereby needn't expend unnecessary material, manpower and man-hour and can guarantee identical even better technique effect simultaneously, thereby promote realizations of goal such as automobile lightweight, raising fuel economy, energy-saving and emission-reduction.
In addition; In Fig. 7, also show respectively and carry out body structure at the embodiment that adopts the inventive method and optimize forward and backward human pilot ear pressure response correlation curve, wherein curve I is corresponding be human pilot ear pressure response curve, curve II under original structure corresponding be adopt human pilot ear pressure response curve, the curve III of traditional approach after traditional damping pad is set on the original structure corresponding be that the embodiment of employing the inventive method is being provided with the human pilot ear pressure response curve after on the original structure damping pad and reinforcement being set.Can find through Fig. 7 that improved vehicle body pressure response amplitude in wide frequency ranges all has significantly very much and reduce, and under the situation of damping pad loss of weight about 50%, the acoustic response of the acoustic response of improvement project and the plan of establishment of traditional damping pad is about the same.This shows, adopt the inventive method can obtain the technique effect of highly significant really, and can create considerable society and economic benefit, therefore rather be worth in automobile technical field and other similar techniques fields, applying.
More than enumerate some specific embodiments and come the sets forth in detail method that realizes body structure optimization based on the analysis of vehicle body panel beating normal stiffness of the present invention; These a few examples only supply to explain the usefulness of principle of the present invention and embodiment thereof; But not limitation of the present invention; Under the situation that does not break away from the spirit and scope of the present invention, those of ordinary skill in the art can also make various distortion and improvement.Therefore all technical schemes that are equal to all should belong to category of the present invention and limited by each item claim of the present invention.
Claims (5)
1. a method of optimizing based on vehicle body panel beating normal stiffness analysis realization body structure is characterized in that, said method comprising the steps of:
A, handle to obtain the stiffness matrix [K] of vehicle body node through carrying out FEM calculation, and through formula [U]=[K]
-1[F] obtains the transposed matrix [U] of vehicle body node, and wherein [F] is for acting on the moment battle array of the power composition on each vehicle body node, [K]
-1It is the inverse matrix of said stiffness matrix [K];
B, with said inverse matrix [K]
-1Carrying out projection to the normal orientation of vehicle body node calculates to obtain the normal stiffness matrix [K of vehicle body node
n] inverse matrix [K
n]
-1, and through formula [U
n]=[K
n]
-1Obtain the normal direction transposed matrix [U of vehicle body node
n], said normal stiffness is meant the rigidity of the normal orientation of the node on the vehicle body sheet metal structural, is the ratio in the normal orientation power that applies and the normal direction displacement that produced by this power effect of this node;
C, the said normal direction transposed matrix [U that will obtain
n] converting to can be by the form of finite element the poster processing soft identification, and import the normal direction displacement cloud atlas that the finite element the poster processing soft shows the vehicle body node; And
D, confirm that according to the display result of the normal direction displacement cloud atlas of said vehicle body node vehicle body panel beating rigidity weak area is so that carry out the body structure optimization process.
2. the method for optimizing based on vehicle body panel beating normal stiffness analysis realization body structure according to claim 1 is characterized in that, finds the solution said inverse matrix [K among the said step B
n]
-1Step specifically comprise:
B1, in the normal vector of vehicle body node, utilize node coordinate to solve the vector v of any two intersection edges of a shell unit
1=(x
2-x
1, y
2-y
1) and v
2=(x
3-x
1, y
3-y
1), (x wherein
1, y
1) be vector v
1And v
2The joining coordinate, (x
2, y
2) be vector v
1Other end point coordinate, (x
3, y
3) be vector v
2Other end point coordinate;
B2, compute vector v
1And v
2Cross product, thereby obtain the normal vector of said shell unit
B3, repeating step b1-b2, thus the normal vector s of another shell unit adjacent obtained with said shell unit
2
B4, calculating normal vector s
1With s
2Dot product, thereby obtain the normal vector v of first node
n=s
1S
2And
B5, repeating step b1-b4, thereby the normal vector matrix [v of acquisition vehicle body node
n], and through formula [K
n]
-1=[K]
-1[v
n] obtain said inverse matrix [K
n]
-1
3. the method that realizes body structure optimization based on the analysis of vehicle body panel beating normal stiffness according to claim 1 and 2; It is characterized in that the body structure optimization process among the said step D is included in rigidity reinforcement structure and/or damped part are set in the said vehicle body panel beating rigidity weak area.
4. the method for optimizing based on vehicle body panel beating normal stiffness analysis realization body structure according to claim 3 is characterized in that said damped part is the damping pad.
5. the method for optimizing based on vehicle body panel beating normal stiffness analysis realization body structure according to claim 4 is characterized in that said damping pad is secured in the said vehicle body panel beating rigidity weak area.
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| GB2524745A (en) * | 2014-03-31 | 2015-10-07 | Jaguar Land Rover Ltd | Wading simulation method |
| CN105844039A (en) * | 2016-03-31 | 2016-08-10 | 吉林大学 | Method for evaluating local rigidity contribution degrees of body structure |
| CN105912748A (en) * | 2016-03-31 | 2016-08-31 | 吉林大学 | Method of evaluating contribution degree of each local mode of vehicle body structure |
| GB2539499A (en) * | 2015-06-19 | 2016-12-21 | Jaguar Land Rover Ltd | Wading simulation method |
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| GB2524745A (en) * | 2014-03-31 | 2015-10-07 | Jaguar Land Rover Ltd | Wading simulation method |
| GB2526671A (en) * | 2014-03-31 | 2015-12-02 | Jaguar Land Rover Ltd | Wading simulation method |
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| CN107527126A (en) * | 2016-06-21 | 2017-12-29 | 中国辐射防护研究院 | The radiation risk evaluation method of specific region near radioactive substance transit route |
| CN107527126B (en) * | 2016-06-21 | 2021-11-16 | 中国辐射防护研究院 | Radiation risk evaluation method for specific area near radioactive product transportation route |
| CN107665263A (en) * | 2016-07-27 | 2018-02-06 | 长城汽车股份有限公司 | Auto parts and components lap position lacquer painting cracking detection method, system and vehicle |
| CN112100738A (en) * | 2020-08-14 | 2020-12-18 | 中国第一汽车股份有限公司 | Method for calculating and analyzing normal dynamic stiffness of vehicle body metal plate in cloud picture form |
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