CN108140065A - The stiffness analysis method of vehicle body - Google Patents
The stiffness analysis method of vehicle body Download PDFInfo
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- CN108140065A CN108140065A CN201680054626.8A CN201680054626A CN108140065A CN 108140065 A CN108140065 A CN 108140065A CN 201680054626 A CN201680054626 A CN 201680054626A CN 108140065 A CN108140065 A CN 108140065A
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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Abstract
The stiffness analysis method of the vehicle body of the present invention uses the body frame model (1) of automobile, stiffness analysis is carried out by computer, the body frame model (1) of the automobile has the component fixed connection portion (3) that either cap assemblies are fixed or linked, and it is formed using at least one party of flat elemental or three-dimensional element, it is characterized in that, comprising：Specified position in the component either region for the fixed connection portion (3) that body frame model (1) was fixed or be linked to cap assemblies sets the comparable quality of quality with component or cap assemblies and generates the quality settings body frame model generation step (S1) of quality settings body frame model (21), considers that the inertia force acted on during running car carries out the stiffness analysis step (S3) of stiffness analysis about quality settings body frame model (21).
Description
Technical field
The present invention relates to stiffness analysis (stiffness analysis) methods of vehicle body (automotive body), special
It is not the inertia force for being related to considering to act under the transport condition (driving condition) of automobile (automobile)
The influence of (inertia force) carries out the vehicle of the stiffness analysis of body frame (automotive body structure)
The stiffness analysis method of body.
Background technology
In recent years, in the automotive industry, for the reason of the environmental problem, the lightweight (weight of vehicle body has been developed
Reduction of automotive body), in the design of vehicle body, CAE analysis (computer aided
Engineering analysis) as indispensable technology.In the CAE analysis, implement stiffness analysis, crash analysis
(crashworthiness analysis), vibration analysis (vibration analysis) etc., largely contribute to vehicle
The raising of body performance (performance of automotive body).Also, it learns and vehicle is not only evaluated by CAE analysis
Body performance also uses the analysis result obtained in the CAE analysis to carry out mathematics optimization (mathematical
Optimization), plate thickness optimization (thickness optimization), shape optimum (shape optimization),
The optimizations such as topological optimization (topology optimization) are analyzed, and realize the raising of various body performances, the light weight of vehicle body
Change.Such as it is evaluated under transport condition by numerical analysis (numerical analysis) Patent Document 1 discloses one kind
Vehicle (automotive) rigidity stiffness estimation auxiliary (support for stiffnessevaluation) method.
Existing technical literature
Patent document
Patent document 1:No. 5203851 bulletins of Japanese Patent No.
Invention content
The subject that invention will solve
In the case where considering state of the vehicle just in actual travel, such as because of lane changing (lane change) etc.
When leading to vehicle body behavior (behavior on automotive body) variation, the position of vehicle center position is left to being disposed in
The inertia force of component (fittings) or cap assemblies (lid component) effect put comes to the Zona transformans of body frame
Large effect.Even this is because component or cap assemblies, the component parts that multiple component combinations are formed
(assembly) quality (mass) of (ASSY) becomes more than 10kg, the body frame for being about 100~300kg for quality sometimes
For can ignore.Therefore, in the performance for evaluating body frame, it is expected with consider it is practical act on when driving component or
The state of the inertia force of person's cap assemblies is evaluated.In addition, in the present invention, component is engine (engine), speed changer
(transmission), the common name of seat (sheet) etc., cap assemblies are car door (door), luggage case (trunk), car bonnet
(hood) the common name such as.
Here, the stiffness estimation householder method of vehicle disclosed in patent document 1 is used for evaluating vehicle body by damper
The rigidity of vehicle that (shock absorber), soft bushing (bush) support, under free end bearing state, which matches
Equipped with component, cap assemblies.
However, in general, in the design initial stage of body frame, appearance, the graphic designs of vehicle have been determined,
Largely influence the appearance of vehicle, the cap assemblies of graphic designs, stage phase is finally determined component after design mostly.
Therefore, in the stage before the shape of component, cap assemblies is determined, it is difficult to pass through vehicle disclosed in patent document 1
Stiffness estimation householder method considers to evaluate body frame with acting on the inertia force of component, cap assemblies under practical transport condition
Performance.
Also, even if when stage phase finally determines component, cap assemblies after design, component, cap assemblies have been arranged
Vehicle (whole (full body)) carry out CAE analysis for object to evaluate the performance of body frame, also without Slack Time from
Here the design of modification body frame is traced back to again.Therefore, in the past, only by using body frame as object CAE analysis come
Carry out the performance evaluation and design of body frame.
The present invention is completed to solve the subject, and it is an object of the present invention to provide a kind of following stiffness analysis side of vehicle body
Method：In the body frame model of automobile, even if before component or cap assemblies are determined, it also can be by replacing these dresses
Spare unit or cap assemblies and set and be equivalent to their quality, so as to consider the inertia force acted on when driving of automobile come high-precision
Ground carries out stiffness analysis.
Means for solving the problems
In order to solve the problem and realize purpose, the stiffness analysis method of vehicle body of the invention uses the vehicle body bone of automobile
Frame model carries out stiffness analysis by computer, the body frame model of the automobile have component or cap assemblies are fixed or
The fixed connection portion of person's connection, and use flat elemental (shellel ements) or three-dimensional element (solidel ements)
At least one party and form, comprise the following steps：Quality settings body frame model generation step, in component or cap assemblies
Specified position in the region of fixed connection portion that is fixed or being linked to the body frame model, setting and the component
Or the comparable quality of quality of cap assemblies, generate quality settings body frame model；Stiffness analysis step, about the quality
Body frame model is set, considers that the inertia force acted on during the running car carries out stiffness analysis.
The stiffness analysis method of the vehicle body of the present invention is characterized in that, in the invention, by the quality settings vehicle body
The specified position in skeleton pattern generation step is set on the straight line for linking the fixed connection portion or on curve.
The stiffness analysis method of the vehicle body of the present invention is characterized in that, in the invention, in the component or lid
In the case that component is the movable rotation movable member of rotation, the specified position is set in addition to the component or lid
Position except on the movable central shaft of rotation when component rotation is movable.
The stiffness analysis method of the vehicle body of the present invention is characterized in that, in the invention, by the quality settings vehicle body
The specified position in skeleton pattern generation step be set in it is being surrounded by the straight line for linking the fixed connection portion, in addition to institute
In plane except stating on the line of straight line or by linking the curve encirclement, in addition to the curve of the fixed connection portion
On curved surface except on line.
The stiffness analysis method of the vehicle body of the present invention is characterized in that, in the invention, in the quality settings vehicle body
In skeleton pattern generation step, use quality element (masselements), by the quality factor and the fixed connection portion
The rigid body element of connection, setting and the comparable quality of quality of the component or cap assemblies.
The stiffness analysis method of the vehicle body of the present invention is characterized in that, in the invention, in the quality settings vehicle body
In skeleton pattern generation step, the setting of use quality element and tension element (beam elements) and the component or
The comparable quality of quality of cap assemblies, the quality factor are equivalent to fixed or connect with quality sum possessed by tension element
Tie the quality of the component or cap assemblies in the fixed connection portion.
The stiffness analysis method of the vehicle body of the present invention is characterized in that, in the invention, in the quality settings vehicle body
In skeleton pattern generation step, using with the tension element with the comparable quality of the quality of the component or cap assemblies,
Setting and the comparable quality of quality of the component or cap assemblies.
Invention effect
The present invention with by component either cap assemblies fix or link fixed connection portion, using flat elemental or
At least one party of person's solid element and in the body frame model of automobile that forms, fixed included in component or cap assemblies or
Person is linked to specified position setting and the matter of component or cap assemblies in the region of the fixed connection portion of body frame model
It measures comparable quality and generates the quality settings body frame model generation step of quality settings body frame model, about quality
Setting body frame model considers that the inertia force acted on during running car carries out the stiffness analysis step of stiffness analysis, so as to
Evaluate while the inertia force of component or cap assemblies is acted on during consideration running car the rigidity of body frame.
Description of the drawings
Fig. 1 is the flow chart of the flow of the processing of the stiffness analysis method for the vehicle body for representing embodiments of the present invention.
Fig. 2 is that the body frame model used in the stiffness analysis method to the vehicle body in embodiments of the present invention carries out
The definition graph of explanation.
Fig. 3 is the quality settings as analysis object in the stiffness analysis method to the vehicle body in embodiments of the present invention
The definition graph that body frame model illustrates.
Fig. 4 is the composition for representing to implement the stiffness analysis device of the stiffness analysis method of the vehicle body of embodiments of the present invention
Block diagram.
Fig. 5 is the quality settings body frame model life to the stiffness analysis method of the vehicle body in embodiments of the present invention
Into in step, the definition graph that the specified position of setting quality illustrates.
Fig. 6 is the quality settings body frame model life to the stiffness analysis method of the vehicle body in embodiments of the present invention
Into in step, the definition graph that the quality settings body frame model of setting quality illustrates.
Fig. 7 is the quality settings body frame model generation to the stiffness analysis method of the vehicle body of embodiments of the present invention
The definition graph that the setting method of quality in step illustrates.
Fig. 8 is among the embodiment of the present invention, in the stiffness analysis of the static twist of vehicle body (static torsion)
The definition graph that illustrates of load limitation (load and constraint) condition.
Fig. 9 is to represent obtained in an embodiment of the present invention by the stiffness analysis of the static twist of vehicle body, load side
To displacement (displacement) result figure.
Figure 10 is to represent being obtained in an embodiment of the present invention by the stiffness analysis of the static twist of vehicle body, of the invention
The result of example and the average torsion stiffness and stiffness variation rate (changing rate of stiffness) of comparative example
Figure.
Figure 11 be in an embodiment of the present invention, the loading condition (loading condition) that contemplates lane changing illustrates
Definition graph.
Figure 12 be in an embodiment of the present invention, contemplate the displacement of load point in the stiffness analysis of lane changing with
And the figure of the result of stiffness variation rate.
Figure 13 is in an embodiment of the present invention to the front side of vehicle body (front side of automotive body)
The figure that the loading condition of imparting illustrates.
Figure 14 is the load direction under each loading condition for representing in an embodiment of the present invention to assign the front side of vehicle body
Displacement result figure.
Figure 15 is the stiffness variation under each loading condition for representing in an embodiment of the present invention to assign the front side of vehicle body
The figure of the result of rate.
Figure 16 is under each loading condition for representing in an embodiment of the present invention to assign the front side of vehicle body, example of the present invention
The figure of the correlation of rigidity value and stiffness variation rate between comparative example 2.
Figure 17 is in an embodiment of the present invention to the rear side of vehicle body (rear side of automotive body)
The loading condition of imparting illustrates figure.
Figure 18 is the load direction under each loading condition for representing in an embodiment of the present invention to assign the rear side of vehicle body
Displacement result figure.
Figure 19 is the stiffness variation under each loading condition for representing in an embodiment of the present invention to assign the rear side of vehicle body
The figure of the result of rate.
Figure 20 is under each loading condition for representing in an embodiment of the present invention to assign the rear side of vehicle body, example of the present invention
The figure of the correlation of rigidity value and stiffness variation rate between comparative example 2.
Specific embodiment
Hereinafter, it is described with reference to embodiments of the present invention.The stiffness analysis method of the vehicle body of present embodiment for
With by component, either cap assemblies are fixed or the fixed connection portion 3 that links and using flat elemental or three-dimensional element
At least one party and the body frame model 1 (with reference to Fig. 2) of the automobile that forms are suitable with the component or cap assemblies to set
The quality settings body frame model 21 (with reference to Fig. 3) of quality generation carry out stiffness analysis for analysis object.Present embodiment
Vehicle body stiffness analysis method can use the vehicle body that forms like that of block diagram as shown in Figure 4 stiffness analysis device 41 (with
Under, referred to as " stiffness analysis device ") it carries out.Hereinafter, as the body frame model 1 and rigidity of object in the present invention
After each composition explanation of analytical equipment 41, each step in the stiffness analysis method of the vehicle body of present embodiment is said
It is bright.
＜ body frame models ＞
As shown in Fig. 2, the body frame model 1 used in the present invention is only by the skeleton parts (structural such as chassis
Parts it) forms, has the component fixed connection portion 3 that either cap assemblies are fixed or linked.Body frame model 1 uses
At least one party of flat elemental or three-dimensional element and form, element information etc. is stored in (the ginseng of body frame model file 60
According to Fig. 4).
As fixed connection portion 3 possessed by body frame model 1, as an example is shown in Fig. 2, can enumerate by
Hinge (hinge) 3a of the upside of rotation vehicle door (revolving door) fixation or connection, the hinge 3b of downside, plate is hit
(striker) 3c etc..Wherein, fixed connection portion 3 is not limited to these, also the engine mount comprising stationary engine
(engine mount) etc. for fixed equipment product component, by addition to rotation vehicle door slip car door (slide door),
The component that this kind of cap assemblies such as hood (bonnet) are fixed or linked.
＜ analytical equipments ＞
Stiffness analysis device 41 used in the stiffness analysis method of the vehicle body of present embodiment is to show one in Fig. 3
The quality settings body frame model 21 of example is to analyze the device that object carries out stiffness analysis, by PC (personal computers
(personal computer)) etc. computers form.As shown in figure 4, stiffness analysis device 41 has display device (display
Device) 43, input unit (input device) 45, storage device 47, operation (the working data of data storage 49
Memory), arithmetic processing section (arithmetic processing unit) 50.In addition, it is connected in arithmetic processing section 50 aobvious
Showing device 43, input unit 45, storage device 47 and operation data storage 49, are held by the instruction of arithmetic processing section 50
Each function of row.
<Display device>
Display device 43 is used in display of result of calculation etc., is made of LCD monitor (LCD monitor) etc..
<Input unit>
Input unit 45 is used in operator and the display of body frame model 1, quality settings body frame model 21 is referred to
Show, the input of analysis condition etc., be made of keyboard (keyboard), mouse (mouse) etc..
<Storage device>
Storage device 47 is used in storage of file (file) etc. by the compositions such as hard disk (hard disk).In addition, storage
Device 47 at least stores the various files such as body frame model file 60, the program (program) performed by arithmetic processing section 50
Deng.
<Operation data storage>
Operation data storage 49 is used in temporary preservation, operation of data used in arithmetic processing section 50 etc., by
The compositions such as RAM (random access memory).
<Arithmetic processing section>
Arithmetic processing section 50 is made of the CPU such as PC (central processing unit (central processing unit)),
Have quality settings body frame model generating unit 51 and stiffness analysis portion 53.Each portion passes through journey as defined in being performed as CPU
Sequence is realized.Hereinafter, explain the composition in each portion in arithmetic processing section 50 in detail based on Fig. 4.
<Quality settings body frame model generating unit>
In component, either body frame is fixed or be linked to cap assemblies to quality settings body frame model generating unit 51
Specified position in the region of the fixed connection portion 3 of model 1, setting are equivalent to the matter of the quality of the component or cap assemblies
It measures and generates quality settings body frame model 21.
<Stiffness analysis portion>
Stiffness analysis portion 53 in body frame model 1 using quality settings body frame model generating unit 51 to setting quality
And the quality settings body frame model 21 generated, carry out stiffness analysis with considering the inertia force acted on during running car.
＜ body stiffness analysis methods ＞
It is equivalent to as shown in Figure 1, the stiffness analysis method of the vehicle body of present embodiment is included in the setting of body frame model 1
The quality settings body frame model generation step S1 of the quality of component or cap assemblies, consider to act on during running car it is used
Carry out to property power the stiffness analysis step S3 of stiffness analysis.Hereinafter, each step is illustrated.In addition, each step all passes through behaviour
The instruction for making personnel (operator) is performed by computer.
<Quality settings body frame model generation step>
Quality settings body frame model generation step S1 is following steps：In component, either cap assemblies are fixed or are connected
It ties in the specified position in the region of the fixed connection portion 3 of body frame model 1, setting is equivalent to the component or lid group
The quality of the quality of part, generation quality settings body frame model 21.The quality settings body frame model generation step S1 by
The quality settings body frame model generating unit 51 of stiffness analysis device 41 carries out.
In quality settings body frame model generation step S1, as shown in Figure 5 in component or cap assemblies institute
Specified position setting quality factor 11 in the fixed either region of connection is equivalent to component or lid group so as to set
The quality of the quality of part.
As shown in Figure 5, that is, setting quality factor 11 specified position be set in by multiple fixed connection portions 3 (hinge 3a with
And hit plate 3c, hinge 3b and hit plate 3c, hinge 3a and hinge 3b) the straight line L upper (reference Fig. 5 (a)) of connection or along installation
On the curve of the shape connection fixed connection portion 3 of the vehicle body of cap assemblies etc..
As shown in Fig. 2, being rotated as rotation vehicle door in component or cap assemblies in movable rotation movable member, revolve
Change trains or buses rotation it is movable when the movable central shaft of rotation be located at will be on the line of the hinge 3a of rotation vehicle door and hinge 3b connections.And
And the movable central shaft of the rotation is located at the boundary in the region for fixing or being linked to body frame model 1 with rotation vehicle door substantially
Identical position.
In contrast, by the hinge 3a of rotation vehicle door and hit plate 3c connection straight line, by hinge 3b and hit plate 3c connection
The inside in the region of body frame model 1 positioned at rotation vehicle door is fixed or be linked to straight line.
When the quality settings that will be equivalent to the component or cap assemblies are in body frame model 1, for aftermentioned
Stiffness analysis step S3 in consider to act on the inertia force this respects of component or cap assemblies, be preferably set in vehicle body
Than component, either cap assemblies are fixed or the boundary in region that links position close to the inner portion in skeleton pattern 1.Therefore, it is desirable to
By set be equivalent to component or cap assemblies quality specified position, be set in multiple fixed connection portions 3 are linked it is straight
On the line of line L either on the line of curve in, in addition to the movable center of rotation when component or cap assemblies carry out rotating movable
Position on axis.
Also, it sets the specified position of quality for being equivalent to component or cap assemblies to be not limited on the line of straight line L
Or on the line of curve, it can also be set on the plane P surrounded by straight line L on (with reference to Fig. 5 (b)) or the curved surface surrounded by curve
(illustration omitted).
Here, either curve is the boundary of plane P or curved surface to straight line L, it is therefore desirable for setting phase in the inside on the boundary
When in the quality of component or cap assemblies.It is preferable, therefore, that by the quality for being equivalent to component or cap assemblies is set
Specified position, be set on the plane P surrounded by straight line L (wherein, other than on the line of straight line L) or be set in by song
On the curved surface that line surrounds (wherein, other than on the line of curve).
In addition, in the case where component is fixed or linked with 4 points of fixed connection portion 3, preferably with 2 straight lines
Cross one another mode straight line links fixed connection portion 3, and set quality factor 11 on this line.In this case,
Fixed connection portion 3 can also with reference to possessed by vehicle body curvature (curvature) and connected with curve, and set on the curve
Quality factor 11.
Here, in quality settings body frame model generation step S1, as by quality settings in the specified position
Specific quality settings method, for example, following (1), (2) and (3) can be enumerated.
(1) it is set in specified position with the quality factor 11 with the comparable quality of quality of component or cap assemblies,
Use 15 quality of connection element 11 of rigid body element and fixed connection portion 3 (with reference to Fig. 6 (a), (b)).Here, Fig. 6 (a) is to link
The example of a quality factor 11 is set on the center of the straight line L of fixed connection portion 3, but can also be as shown in Fig. 6 (b), equal
It waits and sets multiple quality factors 11 on the point of Ground Splits straight line L.In the case where setting multiple quality factors 11 in this way, with each matter
The mode of quality that the summation for measuring the quality of element 11 is equivalent to component or cap assemblies determines the quality of each quality factor 11
.
(2) it is set in specified position with the quality factor 11 with the comparable quality of quality of component or cap assemblies,
Use 17 quality of connection element 11 of tension element and fixed connection portion 3 (with reference to Fig. 7 (a)).In this case, quality factor 11 with
The component or lid quality and that be set to either be linked to fixed connection portion 3 with fixing that tension element 17 is respectively provided with
The quality of component is suitable.
The quality of tension element 17 is by the section characteristic (cross-sectional property) as tension element 17
The sectional area (cross-sectional area) that is endowed is endowed as material property (material property)
Density of material (material density) determines.Radius of the sectional area of tension element 17 for example by assigning tension element 17
(radius) it is determined.
Also, in aftermentioned stiffness analysis step S3, need to want to will act on quality factor 11 and tension
Load caused by the inertia force of element 17 is transmitted to section characteristic and material spy needed for quality settings body frame model 21
Property, suitably it is set in tension element 17.
In addition, although tension element 17 is linear element, but as long as the axial drawing for acting on the element can be transmitted
Load (tensile load) and compressive load (compressive load) are stretched, then can also be bar element (rod
Elements) (stick element).The quality of the bar element is identical with tension element 17, the section being endowed by being used as section characteristic
Product (or radius), the density of material being endowed as material property determine.
(3) (reference is set using having the tension element 17 with the comparable quality of quality of component or cap assemblies
Fig. 7 (b)).In this case, the quality of tension element 17 by be endowed as the section characteristic of tension element 17 sectional area,
The density of material that is endowed as material property determines.Moreover, the sectional area of tension element 17 for example will by assigning tension
The radius of element 17 determines.
<Stiffness analysis step>
Stiffness analysis step S3 is the steps of：It is set about in quality settings body frame model generation step S1
The quality settings body frame model 21 or quality settings body frame model 23 (with reference to Fig. 6) of quality, consider automobile
The inertia force acted on when driving carries out stiffness analysis.In stiffness analysis step S3, when carrying out stiffness analysis, as analysis
Condition, setting loading condition to quality settings body frame model 21 or quality settings body frame model 23, (load limits
Condition).In addition, the inertia force acted on when driving of automobile is considered using inertia method for releasing (inertia relief method).
Here, inertia method for releasing is following analysis method：To become the bearing dot point of the benchmark of the coordinate of inertia force
Under the state (free end bearing state) of object, from acting on motion with uniform acceleration (uniformly-accelerated motion)
In object make every effort to stress (stress), deformation (strain), be used in movement in aircraft, ship static analysis
(static analysis) (referring to patent document 1).
In this way, by performing stiffness analysis in stiffness analysis step S3, quality settings body frame model can be obtained
Displacement, stress in 21 etc. from its result as a result, and then can calculate the rigidity of quality settings body frame model 21.
Embodiment
Hereinafter, the embodiment of the effect to confirmed the present invention illustrates.In the present embodiment, to shown in Fig. 2
The fixed connection portion 3 of body frame model 1 is fixed or is linked in the region as the rotation vehicle door component parts of cap assemblies
Specified position, to set with the quality settings body frame model of the comparable quality of rotation vehicle door component parts as analysis pair
As having carried out stiffness analysis.
In the present embodiment, the quality of body frame model 1 is about 300kg, is set in the carrousel of body frame model 1
Each of the quality of door component parts is 10kg.Therefore, as example, with by the upside in body frame model 1
10 quality factors 11 are equably configured in hinge 3a on the straight line with hitting plate 3c connections, and connect the quality using rigid body element 15
Element 11, hinge 3a and quality settings body frame model 23 (with reference to Fig. 6 (b)) that plate 3c forms is hit as analysis object.
Then, in a manner of making the quality that the summation of quality of quality factor 11 becomes rotation vehicle door component parts, each quality is set
The quality (=1kg) (example of the present invention) of element 11.
On the other hand, as comparative example, for not setting with the comparable quality of rotation vehicle door component parts and only with vehicle body
Skeleton pattern 1 as the situation (comparative example 1) of analysis object, to be combined with rotation vehicle door constituting portion in body frame model 1
Situation (comparative example 2) of the Car body model (illustration omitted) that part model forms as analysis object, has also carried out stiffness analysis.
In the present embodiment, first, stiffness analysis is carried out by object of static twist, has studied and be set in quality settings vehicle
The influence of the quality of body skeleton pattern 23.Load restrictive condition is shown in Fig. 8.Load the front overhang that point is vehicle body (with reference to the A of Fig. 8)
Frame (front suspension) installation site has been assigned the load (=1000N) of vertical upward.On the other hand, point is limited
(constraint point) is set as the front suspension installation site (with reference to the B of Fig. 8) of vehicle body and the rear suspension installation position of vehicle body
It puts (with reference to the C and D of Fig. 8).
Rigidity in static twist is evaluated by the average torsion stiffness being obtained as described below.It first, will be after vehicle body
It, will be right on the basis of the straight line of sub-frame (sub-frame) installation site (with reference to C and D of Fig. 8) connection of side (0 degree of angle)
Load point (with reference to A of Fig. 8) assigns the angle of inclination of vehicle body observed when loading from vehicle front side in vehicle body front-rear direction
On be averaged, so as to find out average tilt angle.Then, with the load divided by average slope angle assigned to the load point
Degree, is obtained average torsion stiffness and asks.
The result of the displacement of the load direction of quality settings body frame model 23 in example of the present invention is shown in Fig. 9.Separately
Outside, the average torsion stiffness being obtained according to the displacement obtained by the result of stiffness analysis and stiffness variation rate are shown in Figure 10.
Here, stiffness variation rate is the average torsion stiffness being obtained on the basis of the rigidity of body frame model 1 (with reference to comparative example 1)
Opposite variation.Stiffness variation rate in example of the present invention can be for example obtained by following formula (1).
Stiffness variation rate (%)=and (the average torsion stiffness of example of the present invention-the average torsion stiffness of comparative example 1)/compare
Average torsion stiffness × 100 (1) of example 1
Using static twist as in the stiffness analysis of object, due to setting limitation point as load restrictive condition,
Quality factor 11 or rotation vehicle door component parts are not applied inertia force.Therefore, example of the present invention and comparative example 2 all become with
Take body frame model 1 as the roughly the same average torsion stiffness as a result, stiffness variation rate is also micro- of comparative example 1 for analyzing object
It is small.
Next, in the present embodiment, the stiffness analysis of the automobile in transport condition is contemplated, inertia force is given
The influence that the rigidity of vehicle body is brought is verified.Here, it is contemplated that the automobile in transport condition carries out the situation of lane changing,
As shown in figure 11, it is set in the sub-frame installation site of the rear side of vehicle body and point is loaded at 4 (with reference to " before RH ", " LH of Figure 11
Before ", " after RH ", " after LH ").Then, it assigns the load of 1000N in the vehicle width direction of each load point and carries out stiffness analysis,
Rigidity of the value as vehicle body obtained by the load divided by the displacement of each load point is obtained.
In the present embodiment, it is identical with the static twist, it is suitable with the quality of rotation vehicle door component parts to setting
Quality situation (example of the present invention), only with body frame model 1 be analyze object situation (comparative example 1), rotation will be combined with
Change trains or buses a Car body model obtained by component parts model as analysis object situation (comparative example 2) studied.
Example of the present invention, comparative example 1 and the displacement in comparative example 2 and the result of stiffness variation rate are shown in Figure 12.This
In, stiffness variation rate is identical with the stiffness variation rate in the static twist, is asked body frame model 1 as analysis object
The rigidity (comparative example 1) gone out, is obtained as benchmark.
In example of the present invention, to having 11 effect of quality factor with the comparable quality of the quality of rotation vehicle door component parts
Inertia force, the inertia force are transmitted via rigid body element 15 to quality settings body frame model 23.Therefore, with not considering carrousel
The comparative example 1 of door component parts is compared, and the displacement of example of the present invention about becomes larger 30% (with reference to Figure 12 (a)), as a result, rigidity
About reduce 20% (with reference to Figure 12 (b)).Also, the present invention is illustrated with considering rotation vehicle door component parts model as former state
The displacement of comparative example 2 and stiffness variation rate result unanimous on the whole.Therefore, it is known that the result of example of the present invention is appropriate.
Also, in the present embodiment, for the various transport conditions of automobile corresponding to loading condition, apply the present invention
Vehicle body stiffness analysis method.Here, it is assigned with the front side to vehicle body or rear side and loads and contemplate the static twist
And the stiffness analysis of lane changing is identical, in the case of the quality of setting and rotation vehicle door component parts comparable quality
(example of the present invention), only with body frame model 1 be analyze object situation (comparative example 1), rotation vehicle door constituting portion will be combined with
Situation (comparative example 2) of the Car body model obtained by part model as analysis object is carried out using the stiffness analysis method of the present invention
Stiffness analysis.
Loading condition to imparting load on front side of vehicle body is shown in Figure 13.Front curve shown in Figure 13 (a)
(bending at two mounting position of front suspension(referred to as"front-
Bending ")) to the double of the front suspension installation site (with reference to " RH " and " LH " of Figure 13 (a)) on the right side of vehicle body and left side
Side assigns the load of vertical direction upward.In addition, preceding torsion (the torsion at two mounting shown in Figure 13 (b)
Position of front suspension (referred to as " front-torsion ")) to the right side of vehicle body and
One side of the front suspension installation site (with reference to " RH " and " LH " of Figure 13 (b)) in left side assigns the load of vertical direction upward,
Vertical direction load directed downwardly is assigned to the opposing party.
Preceding single-wheel torsion (torsion at one mounting position of front shown in Figure 13 (c)
Suspension (referred to as " one-side front-torsion ")) to the right side of vehicle body and the front overhang in left side
One party in frame installation site (with reference to " RH " or " LH " of Figure 13 (c)) assigns the load of vertical direction upward.In addition, figure
Preceding tranverse bending (lateral bending at two mounting position of front shown in 13 (d)
Suspension (referred to as " front lateral bending ")) to the sub-frame installation position of the front side of vehicle body
It puts and is assigned in the vehicle width direction towards a left side or towards right (with reference to " before the RH " of Figure 13 (d), " before LH ", " after RH " and " after LH ")
Load.
The displacement as a result, showing in Figure 15 of the load direction obtained by the stiffness analysis in example of the present invention is shown in Figure 14
Go out example of the present invention and the stiffness variation rate of comparative example 2." bending " and " tranverse bending " shown in the horizontal axis of Figure 15 respectively with figure
Loading condition shown in 13 (a) and Figure 13 (d) corresponds to.These stiffness variation rates are by using the displacement of each load point divided by each negative
The rigidity and the difference of rigidity of comparative example 1 divided by the rigidity of comparative example 1 that the load of loading point is obtained, so as to firm in comparative example 1
It is obtained on the basis of degree.
In addition, " torsion " and " single-wheel torsion " shown in the horizontal axis of Figure 15 respectively with Figure 13 (b) and Figure 13 (c) Suo Shi
Loading condition correspond to, the stiffness variation rate under each loading condition is obtained as described below.First, by the pair of the rear side of vehicle body
On the basis of the straight line of frame installation site connection (0 degree of angle), in the direction from front to rear of a vehicle body will to load point (" RH " of Figure 13 or
At least one party of person " LH ") angle of inclination of vehicle body observed from vehicle front side is averaged when assigning load, so as to ask
Go out average tilt angle.Then, average torsion stiffness is obtained in the load divided by average tilt angle that are assigned to the load point.
Also, by be averaged torsion stiffness and the difference of the average torsion stiffness of comparative example 1 divided by the average torsion stiffness of comparative example 1, from
And stiffness variation rate is obtained on the basis of the average torsion stiffness in comparative example 1.
In addition, " torsion (reversed) " shown in the horizontal axis of Figure 15 be with shown in Figure 13 (b) to load point (reference " RH "
And " LH ") the opposite direction of load direction that assigns imparts result in the case of load.Equally, shown in the horizontal axis of Figure 15
" tranverse bending (reversed) " be with shown in Figure 13 (d) to load point (with reference to " before RH ", " before LH ", " after RH ", " after LH ")
The load direction of imparting imparts the result in the case of load to opposite direction.
It is shown in Figure 16 under each loading condition shown in Figure 13, the rigidity obtained in example of the present invention and comparative example 2
Correlation (the reference figure of the correlation (with reference to Figure 16 (a)) of value, the stiffness variation rate obtained in example of the present invention and comparative example 2
16(b)).In figure 16, x-axis shows that the rigidity value obtained by example of the present invention or stiffness variation rate, y-axis are shown by comparing
The rigidity value or stiffness variation rate that example 2 obtains.
As shown in figure 16, the rigidity value of example of the present invention and stiffness variation rate all with as former state by rotation vehicle door component parts
It models and has carried out the rigidity value of the comparative example 2 of stiffness analysis and stiffness variation rate shows almost 1：1 higher phase
Closing property (R2=1.000 and 0.993).By Figure 15 and Figure 16, show example of the present invention in each loading condition with as former state
The stiffness variation rate for the comparative example 2 that ground has modeled rotation vehicle door component parts is consistent well.
Next, in the present embodiment, the situation that load is also imparted on rear side of opposite vehicle body has carried out stiffness analysis.Figure
Loading condition in the case of being shown in 17 to imparting load on rear side of vehicle body.Rear bending (bending shown in Figure 17 (a)
At two mounting position of rear suspension (referred to as " rear-bending ")) it is right
The both sides of the right side of vehicle body and the rear suspension installation site (with reference to " RH " and " LH " of Figure 17 (a)) in left side assign vertical side
To load upward.In addition, retrotorsion (the torsion at two mounting position of shown in Figure 17 (b)
Rear suspension (referred to as " rear-torsion ")) right side of vehicle body and the rear suspension in left side are pacified
One side of holding position (with reference to " RH " and " LH " of Figure 17 (b)) assigns the load of vertical direction upward, and lead is assigned to the opposing party
The vertical load being directed downward.
Rear single-wheel torsion (torsion at one mounting position of rear shown in Figure 17 (c)
Suspension (referred to as " one-side rear-torsion ")) to the right side of vehicle body and the rear overhang in left side
One party in frame installation site (with reference to " RH " or " LH " of Figure 17 (c)) assigns the load of vertical direction upward.In addition, figure
Rear tranverse bending (lateral bending at two mounting position of rear shown in 17 (d)
Suspension (referred to as " rear lateral bending ")) to the sub-frame installation site of the rear side of vehicle body
(with reference to " before the RH " of Figure 17 (d), " before LH ", " after RH " and " after LH ") assigns negative towards a left side or towards right in the vehicle width direction
It carries.
The displacement of the load direction obtained by stiffness analysis in example of the present invention is shown in Figure 18 as a result,
Example of the present invention and the stiffness variation rate of comparative example 2 are shown in Figure 19." bending " shown in the horizontal axis of Figure 19 and
" tranverse bending " is corresponding with the loading condition shown in Figure 17 (a) and Figure 17 (d) respectively.These stiffness variation rates pass through each load point
Displacement divided by each load point the rigidity that is obtained of load and the difference of rigidity of comparative example 1 divided by the rigidity of comparative example 1, from
And it is obtained on the basis of the rigidity in comparative example 1.
In addition, " torsion " and " single-wheel torsion " shown in the horizontal axis of Figure 19 respectively with Figure 17 (b) and Figure 17 (c) Suo Shi
Loading condition correspond to, the stiffness variation rate under each loading condition is obtained as described below.First, the front suspension of vehicle body is pacified
On the basis of the straight line of holding position connection (0 degree of angle), in the direction from front to rear of a vehicle body will to load point (" RH " in Figure 17 or
At least one party of " LH ") angle of inclination of vehicle body observed from vehicle front side is averaged when assigning load, so as to find out
Average tilt angle.Then, average torsion stiffness is obtained in the load divided by average tilt angle that are assigned to the load point.And
And be averaged torsion stiffness and the difference of average torsion stiffness of comparative example 1 divided by the average torsion stiffness of comparative example 1, thus with
Stiffness variation rate is obtained on the basis of average torsion stiffness in comparative example 1.
In addition, " torsion (reversed) " shown in the horizontal axis of Figure 19 be with shown in Figure 17 (b) to load point (reference " RH "
And " LH ") the opposite direction of load direction that assigns imparts result in the case of load.Equally, shown in the horizontal axis of Figure 19
" tranverse bending (reversed) " be with shown in Figure 17 (d) to load point (with reference to " before RH ", " before LH ", " after RH ", " after LH ")
The load direction of imparting imparts the result in the case of load to opposite direction.
It is shown in Figure 20 under each loading condition shown in Figure 17, the rigidity obtained in example of the present invention and comparative example 2
Correlation (the reference figure of the correlation (with reference to Figure 20 (a)) of value, the stiffness variation rate obtained in example of the present invention and comparative example 2
20(b)).In fig. 20, x-axis shows that the rigidity value obtained by example of the present invention or stiffness variation rate, y-axis are shown by comparing
The rigidity value or stiffness variation rate that example 2 obtains.
As shown in figure 20, the rigidity value of example of the present invention and stiffness variation rate all with as former state by rotation vehicle door component parts
It models and has carried out the rigidity value of the comparative example 2 of stiffness analysis and stiffness variation rate shows almost 1：1 higher phase
Closing property (R2=0.9998 and 0.993).By Figure 19 and Figure 20, show example of the present invention in each loading condition with as former state
The comparative example 2 that ground has modeled rotation vehicle door component parts is consistent well.Therefore, the stiffness analysis side of the present invention is shown
Method is effective.
By the above, the stiffness analysis method of vehicle body of the present invention confirms, with by the component or lid of automobile
Component fixes setting in the either body frame model of the automobile of the fixed connection portion of connection and is equivalent to component or cap assemblies
Quality, consider running car when act on the inertia force of the component or cap assemblies and carry out stiffness analysis, so as to
The rigidity of enough body frames being accurately obtained under high transport condition.
Industrial utilizability
The rigidity of the body frame under transport condition can accurately be obtained due to the present invention, can be applied to vehicle
The stiffness analysis of body.
Reference sign
1 body frame model
3 fixed connection portions
3a hinges (upside)
3b hinges (downside)
3c hits plate
11 quality factors
15 rigid body elements
17 tension elements
21st, 23 quality settings body frame model
41 stiffness analysis devices
43 display devices
45 input units
47 storage devices
49 operation data storages
50 arithmetic processing sections
51 quality settings body frame model generating units
53 stiffness analysis portions
60 body frame model files
Claims (7)
1. a kind of stiffness analysis method of vehicle body using the body frame model of automobile, carries out stiffness analysis, the vapour by computer
The body frame model of vehicle has the component fixed connection portion that either cap assemblies are fixed or linked, and uses flat elemental
Or three-dimensional element at least one party and form, which is characterized in that comprise the following steps：
Quality settings body frame model generation step, in component, either the body frame is fixed or be linked to cap assemblies
Specified position in the region of the fixed connection portion of model, setting and the comparable matter of quality of the component or cap assemblies
Amount generates quality settings body frame model；
Stiffness analysis step about the quality settings body frame model, considers the inertia force acted on during the running car
Carry out stiffness analysis.
2. the stiffness analysis method of vehicle body according to claim 1, which is characterized in that
The specified position in the quality settings body frame model generation step is set in the fixed connection portion
On the straight line of connection or on curve.
3. the stiffness analysis method of vehicle body according to claim 2, which is characterized in that
In the case where the component or cap assemblies are the movable rotation movable member of rotation, the specified position is set
Position other than on the movable central shaft of rotation when in addition to the component or movable cap assemblies rotation.
4. the stiffness analysis method of vehicle body according to claim 1, which is characterized in that
The specified position in the quality settings body frame model generation step is set in by linking the fixation even
In plane that the straight line of knot surrounds, other than on the line of the straight line or the song by linking the fixed connection portion
On curved surface that line surrounds, other than on the line of the curve.
5. the stiffness analysis method of vehicle body according to any one of claim 1 to 4, which is characterized in that
In the quality settings body frame model generation step, use quality element, by the quality factor with it is described solid
Determine the rigid body element of linking part connection, setting and the comparable quality of quality of the component or cap assemblies.
6. the stiffness analysis method of vehicle body according to any one of claim 1 to 4, which is characterized in that
In the quality settings body frame model generation step, use quality element and the setting of tension element and the equipment
The comparable quality of the quality of product or cap assemblies,
The quality factor is equivalent to quality sum possessed by tension element and fixes or be linked to the fixed connection portion
Component or cap assemblies quality.
7. the stiffness analysis method of vehicle body according to any one of claim 1 to 4, which is characterized in that
In the quality settings body frame model generation step, using with the quality with the component or cap assemblies
The tension element of comparable quality, setting and the comparable quality of quality of the component or cap assemblies.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| JP2015189498A JP6090400B1 (en) | 2015-09-28 | 2015-09-28 | Body rigidity analysis method |
| JP2015-189498 | 2015-09-28 | ||
| PCT/JP2016/070406 WO2017056627A1 (en) | 2015-09-28 | 2016-07-11 | Vehicle body stiffness analysis method |
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| CN108140065A true CN108140065A (en) | 2018-06-08 |
| CN108140065B CN108140065B (en) | 2021-07-13 |
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| CN201680054626.8A Active CN108140065B (en) | 2015-09-28 | 2016-07-11 | Rigidity analysis method for vehicle body |
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|---|---|
| JP (1) | JP6090400B1 (en) |
| KR (1) | KR101974892B1 (en) |
| CN (1) | CN108140065B (en) |
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| WO (1) | WO2017056627A1 (en) |
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| CN112699460A (en) * | 2020-12-29 | 2021-04-23 | 东风汽车集团有限公司 | White vehicle body rear rigidity analysis and evaluation method |
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| CN108959748A (en) * | 2018-06-22 | 2018-12-07 | 上海思致汽车工程技术有限公司 | A kind of stiffness analysis method of subframe and the attachment point of vehicle body flexible connection |
| JP6614301B1 (en) * | 2018-09-14 | 2019-12-04 | Ｊｆｅスチール株式会社 | Method and apparatus for optimization of vibration characteristics of vehicle body |
| CN111027131B (en) * | 2018-10-08 | 2023-09-15 | 上海汽车集团股份有限公司 | Method and device for determining target torsional rigidity |
| CN112504693B (en) * | 2020-11-25 | 2023-01-24 | 东风柳州汽车有限公司 | Static rigidity test device for body-in-white structure |
| KR102526014B1 (en) | 2021-04-14 | 2023-04-26 | 공주대학교 산학협력단 | Method for analyzing stiffness change of trunk exchange vehicle after collision and method for evaluating safety of repaired vehicle using therof |
| KR102526015B1 (en) | 2021-04-14 | 2023-04-26 | 공주대학교 산학협력단 | Method for analyzing stiffness change of vehicle front frame before and after accident repair and method for evaluating safety of repaired vehicle using thereof |
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| MX369124B (en) | 2019-10-30 |
| KR20180041735A (en) | 2018-04-24 |
| CN108140065B (en) | 2021-07-13 |
| KR101974892B1 (en) | 2019-05-03 |
| WO2017056627A1 (en) | 2017-04-06 |
| MX2018003733A (en) | 2018-06-18 |
| JP6090400B1 (en) | 2017-03-08 |
| JP2017068320A (en) | 2017-04-06 |
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