CN104217047A - Method for manufacturing envelope face of automobile front steering wheel - Google Patents
Method for manufacturing envelope face of automobile front steering wheel Download PDFInfo
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- CN104217047A CN104217047A CN201310220491.6A CN201310220491A CN104217047A CN 104217047 A CN104217047 A CN 104217047A CN 201310220491 A CN201310220491 A CN 201310220491A CN 104217047 A CN104217047 A CN 104217047A
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Abstract
The invention provides a method for manufacturing the envelope face of an automobile front steering wheel. The method comprises the steps that according to the final coupling relationship curved line, between the wheel hop and steering, of the automobile front steering wheel, a movement path file of the front steering wheel is generated; according to the type of a tire of the wheel chosen to be manufactured, a static model of an outline of the tire of the wheel is manufactured; a movement simulation model only containing the outline of the wheel is established, corresponding coordinate values on the outline of the wire of the wheel are changed according to the path curve in the movement path file of the front steering wheel, the wheel is made to conduct simulation movement, enveloping solid sweep is conducted on a movement space of the wheel, and then the movement envelope face of the wheel is obtained. The envelope face obtained according to the method is high in reliability and safety; in addition, the design efficiency can be improved, design risks are reduced, and the development cost is reduced.
Description
Technical field
The present invention relates to automobile technical field, relate in particular to a kind of method of making automobile steering front wheel enveloping surface.
Background technology
The wheel movement enveloping surface of automobile, refers under the various driving cycles of car load, wheel with suspension bob divertical motion to the process of each extreme position, the space that wheel tyre is occupied.It has determined Wheel casing and beater or beat-up hole shape, can also be used to check dynamic clearance and the movement interference situation of wheel and periphery subsystem and parts simultaneously, even also may drive the adjustment of Wheel centre distance, vehicle minimal curve radius etc. in the exploitation of car load framework.Therefore, in the development phase of car load project, design more accurate wheel bag in suitable exploitation node analysis, have important function and significance for reducing design risk, reduce later stage change in design, shorten the construction cycle and reducing cost of development.
The sports envelope face of wheel is decided by the movement mechanism of wheel, its influence factor comprises: the topological structure (suspension type) of suspension system, geometry (suspension system hard spot), relation is jumped and turned to the wheel of wheel, wheel alignment parameter, tyre model, the static delineator standard of tire and snow chain application strategy etc.
At present, automobile engineer adopts simulation software to carry out simulation analysis to the motion of suspension system in the development and Design stage conventionally, analog computation wheel the wheel of vertical direction jump motion and rotate around main pin axis divertical motion time shared space, and make wheel envelope with this.But in suspension system, vibroshock top, lower control arm and vehicle body are connected by rubber bushing, it is FLEXIBLE SYSTEMS more than.But in general suspension motion simulation, usually adopt simple rigid body kinematics model, ignore the mechanism displacement causing due to flexible member stress deformations such as rubber bushings in system, can not accurate simulation go out the movement locus of wheel, the wheel inclusion fruit of gained can not conform to actual conditions well.
Therefore, not yet there is at present the method that can accurate simulation goes out the generation wheel movement enveloping surface of wheel trace.
Summary of the invention
Technical matters to be solved by this invention is, the present invention proposes a kind of method of making automobile steering front wheel enveloping surface, and it can reflect the accurate movement locus of wheel, and makes the wheel enveloping surface that generates smooth complete.
In order to solve the problems of the technologies described above, the one side of the embodiment of the present invention provides a kind of method of making automobile steering front wheel enveloping surface, comprises the steps:
Jump and turn to final coupled relation curve according to the wheel of described automobile steering front wheel, learn software by the first dynamical simulation and carry out tire enveloping surface simulation analysis, generate the movement locus file of described steering front wheel;
According to selected formulation wheel tyre model, make the static model of tyre contour outline;
According to the static model of the wheel tyre profile of made, in the second kinematics simulation software, set up a motion simulation model that only contains described wheel contour, and fixed coordinate system is set up in designing requirement according to car load, its coordinate origin and change in coordinate axis direction are all set identical with car load;
On wheel, create suitable kinematic pair and driving, make the pose of wheel put by wheel center completely and axis on the coordinate figure of point of fixity determine;
Editor's motion rule curve, corresponding coordinate figure on described wheel tyre profile is changed according to geometric locus in the movement locus file of described steering front wheel, make described wheel carry out simulating sports, its space is carried out to enveloping solid and scan, obtain the sports envelope face of described wheel.
Wherein, described final coupled relation curve comprises multiple coordinate points, and described each coordinate points comprises wheel jumping travel parameters and steering rack travel parameters.
Wherein, the movement locus file of described steering front wheel at least comprises: each moment in emulation experiment process, the x of the wheel center point of described steering front wheel, y, the movement locus of z coordinate, and on wheel axis, be certain any x of a fixed value with core wheel distance, y, the movement locus of z coordinate.
Wherein, described according to selected formulation wheel tyre model, the step of making the static model of tyre contour outline further comprises:
Make the static model of the tyre contour outline of described tire under general operating mode, damped condition and accelerating mode.
Wherein, the static model of the tyre contour outline of the described tire of described making under general operating mode are specially:
Obtain the tire cross-section shape figure of a certain model according to ETRTO standard, the described tire cross-section shape of taking turns is rotated a circle around center line, obtain the static model of described tyre contour outline.
Wherein, the static model of the tyre contour outline of the described tire of described making under damped condition are specially:
Obtain the tire cross-section shape figure of a certain model according to ETRTO standard;
Taking wheel center line as axis, by the Part I of described tire cross-section shape ° formation tire model final size from Y-axis positive dirction to Y-axis negative direction Rotate 180;
Form axis P with wheel center line along X coordinate positive dirction translation one radial-deformation, taking P as axis, by the Part II of tire cross-section ° formation tire model final size from Y-axis positive dirction to Y-axis negative direction Rotate 180;
Tire cross-section is moved to P from centerline, form the Part III of tire model final size;
Described three parts are synthesized, just obtained the static model of the tyre contour outline under damped condition.
Wherein, the static model of the tyre contour outline of the described tire of described making under accelerating mode are specially:
Obtain the tire cross-section shape figure of a certain model according to ETRTO standard;
Taking wheel center line as axis, by the Part I of described tire cross-section shape ° formation tire model final size from Y-axis positive dirction to Y-axis negative direction Rotate 180;
Form axis P with wheel center line along X-axis negative direction translation one radial-deformation, taking P as axis, by the Part II of tire cross-section ° formation tire model final size from Y-axis positive dirction to Y-axis negative direction Rotate 180;
Tire cross-section is moved to P from centerline, form the Part III of tire model final size;
Described three parts are synthesized, just obtained the static model of the tyre contour outline under damped condition.
Wherein, described in, make the step that on described wheel tyre profile, corresponding coordinate figure changes according to geometric locus in the movement locus file of described steering front wheel be specially:
At least make the x of the static model central point of described wheel contour, y, is any x of a fixed value with central point distance on z coordinate figure and axis, and z coordinate figure is respectively according to the corresponding orbiting motion in the movement locus file of described steering front wheel.
Wherein, further comprise:
According to the tire enveloping surface of the automobile steering front wheel of made, simulate the interference relation of itself and described tire periphery part.
Wherein, described the first kinematics simulation software is ADAMS/Car software; Described the second kinematics simulation software is CATIA/DMU software.
Implement the present invention, there is following beneficial effect:
In embodiments of the present invention, the motion of wheel is only determined by the coordinate motion track of any on wheel disk coordinate and axis.Compared with prior art, the motion of wheel is no longer dependent on the motion of suspension and steering mechanism.Therefore, apply this technical scheme and make wheel enveloping surface, a kinematics model only need to setting up wheel just can be applicable to all vehicles, does not need to input suspension geometry topological structure and the hard spot information etc. of vehicle, has greatly improved work efficiency;
The sports envelope face obtaining by this method, its result has considered the mechanism elastic deformation of automobile under complex working condition, the factor such as manufacture and use error of tire.The wheel enveloping surface that uses the method to obtain, can measure and check the especially gap of wheel cover of wheel and its Surrounding Parts, acquired results has very high reliability and security, solve the difficult problem that simple rigid model emulation and real train test error are larger, reduce design risk, shorten the car load project development cycle, also reduced car load cost of development.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the main flow chart of a kind of method of making automobile steering front wheel enveloping surface provided by the invention;
Fig. 2 is a kind of movement locus schematic diagram of making the steering front wheel central point X coordinate obtaining in the method for automobile steering front wheel enveloping surface provided by the invention;
Fig. 3 is a kind of movement locus schematic diagram of making the steering front wheel central point Y coordinate obtaining in the method for automobile steering front wheel enveloping surface provided by the invention;
Fig. 4 is a kind of movement locus schematic diagram of making the steering front wheel central point Z coordinate obtaining in the method for automobile steering front wheel enveloping surface provided by the invention;
Fig. 5 is a kind of movement locus schematic diagram of making certain point of fixity X coordinate on the steering front wheel axis obtaining in the method for automobile steering front wheel enveloping surface provided by the invention;
Fig. 6 is a kind of movement locus schematic diagram of making certain point of fixity Y coordinate on the steering front wheel axis obtaining in the method for automobile steering front wheel enveloping surface provided by the invention;
Fig. 7 is a kind of movement locus schematic diagram of making certain point of fixity Z coordinate on the steering front wheel axis obtaining in the method for automobile steering front wheel enveloping surface provided by the invention;
Fig. 8 is a kind of the first tire cad model sectional view adopting in the method for automobile steering front wheel enveloping surface of making provided by the invention;
Fig. 9 is a kind of the second tire cad model sectional view adopting in the method for automobile steering front wheel enveloping surface of making provided by the invention;
Figure 10 is the profile schematic diagram that adopts the wheel under the special operation condition that the tire cad model sectional view of Fig. 9 obtains in a kind of method of making automobile steering front wheel enveloping surface provided by the invention;
Figure 11 is the process flow diagram that obtains final coupled relation curve in an embodiment of a kind of method of making automobile steering front wheel enveloping surface provided by the invention;
Figure 12 is the schematic diagram of the suspension Roof figure of an embodiment in a kind of method of making automobile steering front wheel enveloping surface provided by the invention;
Figure 13 is the front vehicle wheel Roof intention of a kind of vehicle in a kind of method of making automobile steering front wheel enveloping surface provided by the invention;
Figure 14 is the steering front wheel Roof intention of a kind of vehicle under special operation condition in a kind of method of making automobile steering front wheel enveloping surface provided by the invention;
Figure 15 is a kind of enveloping surface schematic diagram of making the steering front wheel obtaining in the method for automobile steering front wheel enveloping surface provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, be the main flow chart of a kind of method of making automobile steering front wheel enveloping surface provided by the invention; It comprises the steps:
Step S10: jump and turn to final coupled relation curve according to the wheel of the automobile steering front wheel obtaining in advance, learn software by the first dynamical simulation and carry out tire enveloping surface simulation analysis, generate the movement locus file of this steering front wheel, wherein, this final coupled relation curve comprises multiple coordinate points, wherein each coordinate points comprises wheel jumping travel parameters and steering rack travel parameters, a kind of final coupled relation curve has been shown in Figure 13, about how obtaining this final coupled relation curve, detailed narration will be carried out hereinafter.
Jump and turn to final coupled relation curve according to this automotive wheel wheel, can pass through dynamics simulation software, output front steering tire movement locus file.In dynamics simulation software (as Adams/Car), carry out tire enveloping surface (Wheel Envelope) simulation analysis.By this emulation, can generate the movement locus file of wheel.Those movement locus files are included in each moment in emulation experiment process, the x of wheel center point, y, on z coordinate and wheel axis, be any x of a fixed value with core wheel distance, y, the movement locus of z coordinate, an example of the movement locus of these six coordinates can be referring to shown in Fig. 2 to Fig. 7.
Step S12: according to the model of selected formulation wheel tyre, make tire cad model;
Particularly, comprising: use needs according to automobile, select suitable wheel tyre model; Make tire cad model.
Particularly, in one embodiment, adopt European tyre technical organization (TRTO European Tyre and Rim Technical Organization, ETRTO) standard to make the cad model of tire.Wherein, each dimensional parameters is all consulted ETRTO-2010 standard according to selected tyre model and is obtained.In this standard, the maximum physical dimension in tire model cross section is all the maximum sizes that use, be the deformation quantity that produces when comprising wheel and normally using and tire maximum allowance value, both ensured to take into full account Ge Jia supplier's the factor such as foozle, again Redundancy Design not.Concrete modeling method is referring to ETRTO-2010 standard.Fig. 8 and Fig. 9 show the cross sectional shape of two kinds of tires, and wherein, the parameter in the tire cross-section in Fig. 8 meets A+2(B
max+ 4) >=s
g, and parameter in tire cross-section in Fig. 9 meets A+2(B
max+ 4) <=s
g.Tire cross-section shape in Fig. 8 or Fig. 9 is rotated a circle around center line, just obtained the cad model of tire.
In addition, under the special operation conditions such as braking or acceleration, need to consider the radial-deformation of wheel in braking and acceleration situation.Wherein, radial-deformation refers to that wheel is being subject to ground force and is hanging under the impact of flexible member stress deformation, and wheel center point is at displacement radially, that is along the displacement of X-axis positive dirction or X-axis negative direction.As shown in figure 10, be the profile schematic diagram that adopts the wheel under the special operation condition that the tire cad model sectional view of Fig. 9 obtains in a kind of method of making automobile steering front wheel enveloping surface provided by the invention; The cad model of the profile of wheel obtains in the following way:
Taking wheel center line (C.R.) as axis, by the Part I of ° formation tire model final size from A point (from Y-axis positive dirction) to B point (Y-axis negative direction) Rotate 180 of tire cross-section as shown in Figure 9; Under damped condition, form axis P with wheel center line (C.R.) along X-axis positive dirction translation one radial-deformation (n millimeter), taking P as axis, by the Part II of tire cross-section ° formation tire model final size from C point (from Y-axis positive dirction) to D point (Y-axis negative direction) Rotate 180; Under accelerating mode, axis P is formed along X-axis negative direction translation radial-deformation by wheel axis, and equally taking P as axis, by the Part II of tire cross-section ° formation tire model final size from C point (from Y-axis positive dirction) to D point (Y-axis negative direction) Rotate 180; Tire cross-section is moved to P place from center line (C.R.), form the Part III of tire model final size; Finally, this three part is synthetic, just obtain the wheel cad model under braking (or acceleration) operating mode.Wherein, in one embodiment, this tire radial-deformation is 10mm, and it is an empirical value, is understandable that, also can determine this deflection according to CAE simulation result.
Step S14: according to the static model of described wheel contour, and assist trail file in conjunction with the fortune of steering front wheel, make wheel movement enveloping surface:
Owing to having obtained the static cad model of wheel contour in step S12, in kinematics simulation software (as CATIA/DMU) module, set up a motion simulation model that only contains wheel contour, and fixed coordinate system is set up in designing requirement according to car load
, its coordinate origin and change in coordinate axis direction are all set identical with car load.On spatial movement Epidemiological Analysis, wheel has 6 spatial movement degree of freedom.Because wheel tyre does not affect around rotatablely moving of its axis the locus that it occupies, therefore, wheel position and attitude at a time can be determined by one group of array that comprises 5 independent parameters, these 5 independent parameters comprise the x of the wheel center point being obtained by step S10, y, on z coordinate figure and axis, be any x of a fixed value with central point distance, z coordinate figure.In kinematics simulation software (as CATIA/DMU) module, on wheel, create suitable kinematic pair and driving, make the pose of wheel put by wheel center completely and axis on the coordinate figure of point of fixity determine.Editor's motion rule curve, corresponding coordinate figure on the static cad model of described wheel contour is changed according to the geometric locus being obtained by step S10, just can make wheel according to the space tracking motion in the l-G simulation test in step S10, particularly, make the x of the static cad model central point of described wheel contour, y, is any x of a fixed value with central point distance on z coordinate figure and axis, and z coordinate figure is respectively according to the orbiting motion in aforesaid movement locus file (Fig. 2-Fig. 7).The space of this wheel contour is carried out to enveloping solid and scan (Swept Volume), just obtained careful smooth wheel movement enveloping surface, as shown in figure 15.
In this technical scheme, the motion of wheel is only determined by the Grid Track of any on wheel disk and axis.Compared with prior art, the motion of wheel is no longer dependent on the motion of suspension and steering mechanism.Therefore, apply this technical scheme and make wheel enveloping surface, a kinematics model only need to setting up wheel just can be applicable to all vehicles, does not need to input suspension geometry topological structure and the hard spot information etc. of vehicle, has greatly improved work efficiency.
Obtaining after wheel movement enveloping surface, use this tire motion enveloping surface can check the gap of wheel and its Surrounding Parts.
Following combination Figure 11-Figure 14, illustrates the process flow diagram that obtains the final coupled relation curve in above-mentioned steps S10 in one embodiment of the invention.
As shown in figure 11, show the process flow diagram that obtains final coupled relation curve in an embodiment of a kind of method of making automobile steering front wheel enveloping surface provided by the invention; Therefrom can find out, it comprises the steps:
Step S110: the first coupled relation curve is jumped and turned to the wheel that obtains automobile steering front wheel, described the first coupled relation curve comprises multiple coordinate points, each coordinate points comprises vibroshock travel parameters and the first steering rack travel parameters, wherein, in described the first coupled relation curve, the described vibroshock travel parameters of each coordinate points is the number percent of the current stroke of vibroshock and vibroshock limit travel, described the first steering rack travel parameters is the number percent of the current stroke of steering rack and steering rack limit travel, wherein vibroshock travel parameters is noted as ordinate, the first steering rack travel parameters is as horizontal ordinate, wherein, the wheel of described automobile steering front wheel is jumped and is turned to the first coupled relation curve can be by advance a large amount of sample cars being tested to acquisition,
Step S111: pass through dynamics simulation software, the second coupled relation curve is jumped and turned to the wheel that obtains the steering front wheel of considering elastic component deformation, described the second coupled relation curve comprises the coordinate points corresponding with described the first coupled relation curve, and each coordinate points comprises wheel jumping travel parameters and the second steering rack travel parameters, particularly, comprising:
Set up the front suspension system realistic model of described automobile by dynamics simulation software, how much topological structures that comprised suspension system, and lining connection and stiffness characteristics, described connection comprises ball pivot or rubber bushing;
The front suspension system of described automobile is carried out to motion simulation, and the motion path that makes suspension comprises multiple coordinate points, it is corresponding one by one with the coordinate points in described the first coupled relation curve, in simulating sports, while measuring the wheel disk of each coordinate points and design point wheel disk along the distance in vertical ground direction as the journey of slipping a line when front-wheel, with rigid suspension system in the time not turning on wheel, when the wheel disk of lower jumping extreme position and design point wheel disk along the distance in vertical ground direction as upper, lower whorl is jumped limit travel, calculate each coordinate points when front-wheel slip a line journey with wheel jump limit travel number percent and as ordinate value, using the number percent of current steering rack stroke and steering rack limit by row stroke as abscissa value, form described the second coupled relation curve,
In addition, in certain embodiments, need to obtain under the special operation conditions such as braking or acceleration by dynamics simulation software the coupled relation curve that the wheel of described steering front wheel is jumped and turned to;
Step S112: in conjunction with described the first coupled relation curve and described the second coupled relation curve, final coupled relation curve is jumped and turned to the wheel that obtains described automobile steering front wheel, wherein, on described final coupled relation curve, the wheel of each coordinate points is jumped the higher value in the wheel jumping travel parameters that travel parameters is respective coordinates point in the damping travel parameters of respective coordinates point in described the first coupled relation curve and described the second coupled relation curve.
Following by describing in conjunction with Figure 12 to Figure 14, so that above-mentioned steps is further understood.
As shown in figure 12, be the schematic diagram of the suspension Roof figure of an embodiment in a kind of method of making automobile steering front wheel enveloping surface provided by the invention.
In vehicle traveling process, due to the constraint of suspension, the steering front wheel of automobile can either bob, can rotate to realize around stub again turn to.Therefore, the athletic performance of wheel is the coupling that wheel is jumped and turned to.In the ordinary course of things, in the process of moving, its wheel can't arrive wheel simultaneously and jump onto the limit and steering lock automobile.The extreme position that may arrive in order to describe the wheel of a vehicle, need to obtain vehicle wheel and jump and turn to the relation curve (being aforementioned the first alleged coupled relation curve) of coupling, and beating of wheel can reflect by the axial stroke of vibroshock.The first coupled relation curve between certain automobile steering rack stroke and vibroshock stroke has been shown in Figure 12, because its shape is similar to roof shape, has therefore been referred to as again roof (Roof) figure, we call suspension Roof figure the first coupled relation curve.Wherein, abscissa axis represents the number percent of the current stroke of steering rack and steering rack limit travel, reflects turning to of wheel; Axis of ordinates represents the number percent of the current stroke of vibroshock and vibroshock limit travel, has reflected the bob of wheel.As seen from Figure 12, this automobile in the process of moving, when steering travel reach capacity stroke 100% time, wheel is jumped onto the Cheng Buhui that slips a line 80% of the stroke that oversteps the extreme limit.
Particularly, suspension Roof figure can obtain by a large amount of sample car tests.In test, first in wheel cover, fill out foam, on skid pad by crossing that hole, braking, maximum turn to and the worst operating condition of test such as climbing embodies the limit of sports record of tire.Test rear measurement or done the reverse motion outline that calculates tire.On a large amount of test figure bases, in conjunction with the adjustment of simulation analysis and design experiences, finally draw suspension Roof figure.In this suspension Roof figure Roof figure, each coordinate points is made up of two parameters, two parameters are respectively vibroshock travel parameters and the first steering rack travel parameters, wherein, in the first coupled relation curve, the vibroshock travel parameters of each coordinate points is the number percent of the current stroke of vibroshock and vibroshock limit travel, and the first steering rack travel parameters is the number percent of the current stroke of steering rack and steering rack limit travel.
As shown in figure 13, be the front vehicle wheel Roof intention of a kind of vehicle in a kind of method of making automobile steering front wheel enveloping surface provided by the invention;
By dynamics simulation software, consider geometry mechanism motion characteristic and the elastic component kinetic characteristic of chassis system, adjust and revise the suspension Roof figure obtaining in Figure 12, obtain wheel Roof figure.
What in Figure 12, definite suspension Roof figure reflected is the coupled relation between steering rack stroke and vibroshock stroke, and it does not consider chassis system elastic component kinetic characteristic.In order to design front tyre envelope more accurately, also need to be on this suspension Roof figure basis, by dynamics simulation software (as ADAMS/Car etc.), calculate and consider that the vehicle wheel of elastic component deformation jump-turns to relation curve (i.e. the second coupled relation curve), and be defined as wheel Roof figure.This implementation procedure is specially:
In the dynamics simulation software module of (as, ADAMS/Car), set up the front suspension system realistic model of this vehicle.In this realistic model, comprise how much topological structures of suspension system, and adopted ball pivot or rubber bushing to connect according to real vehicle situation between the structural member of suspension.Wherein, the stiffness characteristics of rubber bushing can be simulated by revising its property file according to actual measured results.Analogue simulation that should carry out based on dynamics simulation software geometry kinetic characteristic and the elastic component kinetic characteristic of suspension system, it can more approach real vehicle motion conditions;
The front suspension system of this vehicle is carried out to motion simulation, and make the motion path of suspension comprise multiple coordinate points, each coordinate points is made up of vibroshock stroke and two parameters of rack stroke.The coordinate points in its simulating sports path need be corresponding one by one with the coordinate points of the suspension Roof figure in Figure 12, and corresponding its steering rack stroke of two coordinate points is all consistent.In simulating sports, while measuring the wheel disk of each coordinate points and design point wheel disk along the distance in vertical ground direction (z direction) as the journey of slipping a line when front-wheel.During using the wheel disk of rigid suspension system upper and lower jumping extreme position of wheel in the time not turning to and design point, wheel disk is along the distance in vertical ground direction (z direction) as the upper and lower jumping limit travel of taking turns.Calculate each coordinate points and slip a line that journey is jumped the number percent (i.e. wheel jump travel parameters) of limit travel with wheel and as ordinate value when front-wheel, using the number percent (i.e. the second steering rack travel parameters) of steering rack stroke and limit travel as abscissa value, form emulation wheel Roof figure as shown in Figure 3.
Finally, again suspension Roof figure and emulation wheel Roof figure are integrated, get the absolute value the greater at both each coordinate points places, generate final wheel Roof figure (being final coupled relation curve), on this final coupled relation curve, the wheel of each coordinate points is jumped the higher value in the wheel jumping travel parameters of coordinate points of corresponding section in vibroshock travel parameters and described the second coupled relation curve that travel parameters is this coordinate points in described the first coupled relation curve, on this final coupled relation curve, the steering rack travel parameters of each coordinate points is the first steering rack travel parameters of the first coupled relation curve respective coordinates point or the second steering rack travel parameters of the second coupled relation curve respective coordinates point, be understandable that, equate in respective coordinates point place the first steering rack travel parameters and the second steering rack travel parameters.
In the dynamics simulation carrying out in dynamics simulation software, the attribute that has comprised the flexible members such as rubber bushing, therefore the final wheel Roof figure obtaining combines the kinetic characteristic of its rigid mechanism and the Elasticity characteristic of elastic component, makes simulating sports more approach the real conditions of automobile.
As shown in figure 14, be the steering front wheel Roof intention of a kind of vehicle under special operation condition in a kind of method of making automobile steering front wheel enveloping surface provided by the invention;
Under the special operation conditions such as braking or acceleration, the space of wheel can change to some extent, Figure 14 shows the special Roof figure (be the wheel jumping of steering front wheel special operation condition under and the coupled relation curve that turn to) of automobile under braking or accelerating mode, and this special Roof figure can be by drawing in conjunction with simulation analysis and experience on the sample car test figure basis under special operation condition.
Be understandable that, in other embodiment of the present invention, can adopt other mode to obtain final coupled relation curve, for example using the second coupled relation curve directly as final coupled relation curve.Or directly obtain by the mode of emulation by many experiments, also can obtain by existing other modes.
To sum up, the present invention is in conjunction with having used two kinds of kinematics simulation software CATIA and ADAMS software, in the foundation of dynamic suspension system of vehicles model and emulation, consider the performance of the flexible members such as rubber bushing, in motion simulation test, considered the impact on wheel movement due to flexible member stress deformation and special operation condition.Therefore,, compared with general conventional rigid body model emulation, the wheel movement envelope obtaining in embodiments of the invention, can reflect more accurate wheel trace.In addition, utilize CATIA/DMU module, the invention process has proposed the method for convenient and swift accurate making tire motion enveloping surface, and the sports envelope face obtaining is smooth complete.
The wheel movement envelope that uses the embodiment of the present invention to obtain carries out the gap of wheel and its Surrounding Parts and checks, its result has considered the mechanism elastic deformation of automobile under complex working condition, the factor such as manufacture and use error of tire, acquired results approaches actual conditions more, has very high reliability and security.
In addition, in embodiments of the present invention, the motion of wheel is only determined by the Grid Track of any on wheel disk and axis.Compared with prior art, the motion of wheel is no longer dependent on the motion of suspension and steering mechanism.Therefore, apply this technical scheme and make wheel enveloping surface, a kinematics model only need to setting up wheel just can be applicable to all vehicles, does not need to input suspension geometry topological structure and the hard spot information etc. of vehicle, has greatly improved work efficiency.
Be understandable that, one of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, can carry out the hardware that instruction is relevant by computer program to complete, described program can be stored in a computer read/write memory medium, this program, in the time carrying out, can comprise as the flow process of the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above disclosed is only a kind of preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the claims in the present invention, still belongs to the scope that the present invention is contained.
Claims (10)
1. a method of making automobile steering front wheel enveloping surface, is characterized in that, comprises the steps:
Jump and turn to final coupled relation curve according to the wheel of described automobile steering front wheel, learn software by the first dynamical simulation and carry out tire enveloping surface simulation analysis, generate the movement locus file of described steering front wheel;
According to selected formulation wheel tyre model, make the static model of tyre contour outline;
According to the static model of the wheel tyre profile of made, in the second kinematics simulation software, set up a motion simulation model that only contains described wheel contour, and fixed coordinate system is set up in designing requirement according to car load, its coordinate origin and change in coordinate axis direction are all set identical with car load;
On wheel, create suitable kinematic pair and driving, make the pose of wheel put by wheel center completely and axis on the coordinate figure of point of fixity determine, editor's motion rule curve, corresponding coordinate figure on described wheel tyre profile is changed according to geometric locus in the movement locus file of described steering front wheel, make described wheel carry out simulating sports, its space is carried out to enveloping solid and scan, obtain the sports envelope face of described wheel.
2. the method for making automobile steering front wheel enveloping surface as claimed in claim 1, is characterized in that, described final coupled relation curve comprises multiple coordinate points, and described each coordinate points comprises wheel jumping travel parameters and steering rack travel parameters.
3. the method for making automobile steering front wheel enveloping surface as claimed in claim 2, it is characterized in that, the movement locus file of described steering front wheel at least comprises: each moment in emulation experiment process, the x of the wheel center point of described steering front wheel, y, the movement locus of z coordinate, and on wheel axis, be certain any x of a fixed value with core wheel distance, y, the movement locus of z coordinate.
4. the method for making automobile steering front wheel enveloping surface as claimed in claim 3, is characterized in that, described according to selected formulation wheel tyre model, and the step of making the static model of tyre contour outline further comprises:
Make the static model of the tyre contour outline of described tire under general operating mode, damped condition and accelerating mode.
5. the method for making automobile steering front wheel enveloping surface as claimed in claim 4, is characterized in that, the static model of the tyre contour outline of the described tire of described making under general operating mode are specially:
Obtain the tire cross-section shape figure of a certain model according to ETRTO standard, the described tire cross-section shape of taking turns is rotated a circle around center line, obtain the static model of described tyre contour outline.
6. the method for making automobile steering front wheel enveloping surface as claimed in claim 4, is characterized in that, the static model of the tyre contour outline of the described tire of described making under damped condition are specially:
Obtain the tire cross-section shape figure of a certain model according to ETRTO standard;
Taking wheel center line as axis, by the Part I of described tire cross-section shape ° formation tire model final size from Y-axis positive dirction to Y-axis negative direction Rotate 180;
Form axis P with wheel center line along X coordinate positive dirction translation one radial-deformation, taking P as axis, by the Part II of tire cross-section ° formation tire model final size from Y-axis positive dirction to Y-axis negative direction Rotate 180;
Tire cross-section is moved to P from centerline, form the Part III of tire model final size;
Described three parts are synthesized, obtain the static model of the tyre contour outline under described damped condition.
7. the method for making automobile steering front wheel enveloping surface as claimed in claim 4, is characterized in that, the static model of the tyre contour outline of the described tire of described making under accelerating mode are specially:
Obtain the tire cross-section shape figure of a certain model according to ETRTO standard;
Taking wheel center line as axis, by the Part I of described tire cross-section shape ° formation tire model final size from Y-axis positive dirction to Y-axis negative direction Rotate 180;
Form axis P with wheel center line along X-axis negative direction translation one radial-deformation, taking P as axis, by the Part II of tire cross-section ° formation tire model final size from Y-axis positive dirction to Y-axis negative direction Rotate 180;
Tire cross-section is moved to P from centerline, form the Part III of tire model final size;
Described three parts are synthesized, obtain the static model of the tyre contour outline under described damped condition.
8. the method for the making automobile steering front wheel enveloping surface as described in claim 3-7 any one, it is characterized in that, described in make on described wheel tyre profile corresponding coordinate figure change according to geometric locus in the movement locus file of described steering front wheel step be specially:
At least make the x of the static model central point of described wheel contour, y, is any x of a fixed value with central point distance on z coordinate figure and axis, and z coordinate figure is respectively according to the corresponding orbiting motion in the movement locus file of described steering front wheel.
9. the method for making automobile steering front wheel enveloping surface as claimed in claim 8, is characterized in that, further comprises:
According to the tire enveloping surface of the automobile steering front wheel of made, simulate the interference relation of itself and described tire periphery part.
10. the method for making automobile steering front wheel enveloping surface as claimed in claim 8, is characterized in that, described the first kinematics simulation software is ADAMS/Car software; Described the second kinematics simulation software is CATIA/DMU software.
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| CN105868517A (en) * | 2016-06-23 | 2016-08-17 | 奇瑞汽车股份有限公司 | Manufacture method of vibration enveloping body of automobile exhaust pipeline |
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| CN106777705A (en) * | 2016-12-21 | 2017-05-31 | 奇瑞汽车股份有限公司 | The method for designing on parts 3D profiles border at automotive suspension |
| CN106980714A (en) * | 2017-03-08 | 2017-07-25 | 吉利汽车研究院（宁波）有限公司 | A kind of check method in automobile one-key start switching manipulation space |
| CN109598005A (en) * | 2017-09-30 | 2019-04-09 | 长城汽车股份有限公司 | The construction method of tire positional parameter acquisition methods and automobile tire motion envelope |
| CN109270895A (en) * | 2018-07-20 | 2019-01-25 | 青岛理工大学 | Method for realizing complex tire design based on CATIA platform |
| CN109815567A (en) * | 2019-01-09 | 2019-05-28 | 吉利汽车研究院（宁波）有限公司 | A kind of suspension tire envelope generation method |
| CN112287505A (en) * | 2019-07-09 | 2021-01-29 | 广州汽车集团股份有限公司 | Method and device for generating front wheel envelope, and computer storage medium and equipment |
| CN112257267A (en) * | 2020-10-23 | 2021-01-22 | 华人运通(江苏)技术有限公司 | Method and system for manufacturing vehicle tire envelope |
| CN112257267B (en) * | 2020-10-23 | 2023-12-01 | 华人运通(江苏)技术有限公司 | Manufacturing method and system for vehicle tire envelope |
| CN113686598A (en) * | 2021-06-30 | 2021-11-23 | 中汽研汽车检验中心（天津）有限公司 | Tire wheel cover interference inspection method based on K & C test bed |
| CN113686598B (en) * | 2021-06-30 | 2023-09-01 | 中汽研汽车检验中心（天津）有限公司 | K & C test bench-based tire wheel cover interference inspection method |
| CN113886945A (en) * | 2021-09-09 | 2022-01-04 | 东风汽车集团股份有限公司 | Wheel and wheel cover prediction method and device |
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