CN104679930A - Automobile road load extracting method and device - Google Patents
Automobile road load extracting method and device Download PDFInfo
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- CN104679930A CN104679930A CN201310642436.6A CN201310642436A CN104679930A CN 104679930 A CN104679930 A CN 104679930A CN 201310642436 A CN201310642436 A CN 201310642436A CN 104679930 A CN104679930 A CN 104679930A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention discloses an automobile road load extracting method and device and aims to acquire load of each connection of an automobile at the premise of no real automobile provided. The method includes: S1, establishing a finite element model of an automobile chassis, a finite element model of tires and a finite element model of an automobile body, and establishing a pavement finite element model according to related parameters in a pavement drawing for pavement design; S2, assembling the finite element model of the chassis, the finite element model finite element model of the tires and the finite element model of the automobile body to obtain an automobile finite element model; S3, assembling the automobile finite element model and the pavement finite element model, setting motion velocity of the automobile finite element model, and calculating physical parameters of the automobile finite element model when the automobile finite element model runs in the pavement finite element model; S4, extracting load information of each connection of the automobile finite element model from the physical parameters. The automobile road load extracting method and device is used for extracting load of each connection of the automobile.
Description
Technical field
The present invention relates to a kind of car load road load extracting method and device.
Background technology
In modern mechanical industry, there is the structural strength of more than 80% to destroy and caused by fatigure failure.Along with the raising of engineering goods running speed, fatigure failure is more general.Vehicle body is the main load bearing component of automobile, especially car, passenger vehicle equivalent-load formula vehicle body, be the installation foundation of suspension, engine and body accessories, bear the various alternate loads from road surface, engine etc., its fatigue strength performance is to ensureing that the safety and reliability of automobile product is most important.In recent years, vehicle body permanance CAE (Computer Aided Engineering, computer-aided engineering) analysis and research achieve greater advance.Wherein, the load extracting each tie point in car load is efficiently and accurately one of them key issue.First current load extracting method needs by real vehicle in strenuous test section, skid pad, such as test on road paved with oval stones, rectangular slab of stone road, washboard plate circuit, hollow road etc., extract the load of tire centerline, in gathering in the pavement loading spectrum of real vehicle, the load of each vehicle body tie point cannot be obtained simultaneously, therefore need the loading spectrum being obtained these vehicle body tie points by additive method.Method general at present extracts by creating Multi-body model, after creating Multi-body model, need the reliability verifying the Multi-body model created, six of the tire centerline obtained by sunykatuib analysis contrasts to the result data of load or acceleration and experimental test, if comparing result is more close, then this Multi-body model is utilized to extract the load of each vehicle body tie point.This load extracting method time cycle is longer, and expensive, and needs the real vehicle model with new designing car same platform when carrying out vehicle road test in skid pad, therefore cannot provide actual directive function at the preliminary stage of Automobile Design.
Summary of the invention
The object of the present invention is to provide a kind of car load road load extracting method and device, a large amount of experiments can be replaced, save cost, under the prerequisite of incorporeity automobile, car model is set up by computer emulation method, extract the load information of each tie point of automobile eventually through car model, this load information can provide actual directive function at the preliminary stage of Automobile Design.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of car load road load extracting method, comprise the following steps:
S1, the finite element model setting up chassis according to shape and size during Automobile Design respectively, the finite element model of tire, the finite element model of vehicle body, set up the finite element model on road surface according to the correlation parameter in road surface drawing during Pavement Design;
S2, the finite element model of the finite element model on described chassis, described tire and the finite element model of described vehicle body to be assembled, composition car load finite element model;
S3, the finite element model on described car load finite element model and described road surface to be assembled, set the movement velocity of described car load finite element model, calculate physical parameter when described car load finite element model runs on the finite element model on described road surface;
S4, from described physical parameter, extract the load information of each tie point of described car load finite element model.
Embodiment of the present invention also provides a kind of car load road load extraction element, comprises with lower unit:
Newly-built unit, for setting up finite element model, the finite element model of tire, the finite element model of vehicle body on chassis respectively according to shape and size during Automobile Design, sets up the finite element model on road surface according to the correlation parameter in road surface drawing during Pavement Design;
Assembly unit, for the finite element model of the finite element model on described chassis, described tire and the finite element model of described vehicle body are assembled, composition car load finite element model;
Processing unit, for the finite element model of described car load finite element model and described road surface is assembled, set the movement velocity of described car load finite element model, calculate physical parameter when described car load finite element model runs on the finite element model on described road surface;
Extraction unit, for extracting the load information of each tie point of described car load finite element model from described physical parameter.
Embodiment of the present invention in terms of existing technologies, under the prerequisite of incorporeity automobile, utilizes a kind of computer emulation method first to set up finite element model, the finite element model of tire, the finite element model of vehicle body on chassis, and the finite element model on road surface; Then the finite element model of the finite element model on described chassis, described tire and the finite element model of described vehicle body are assembled, composition car load finite element model; Set certain movement velocity to again car load finite element model, then calculate physical parameter when car load finite element model runs on the finite element model on road surface by software; The last load information extracting each tie point of car load finite element model in this physical parameter.This car load road load extracting method can replace a large amount of experiments, save cost, and this load information can provide actual directive function at the preliminary stage of Automobile Design well.
In addition, after described S2, before described S3, described method also comprises: the rigidity of demarcating the finite element model of described tire, and the rigidity of the finite element model of described tire comprises radial rigidity, lateral rigidity and turns to rigidity.
Before obtaining finite element model in assembling, to the radial rigidity of the finite element model of tire, lateral rigidity and turn to rigidity etc. to demarcate, can improve the precision of tire, thus improve the degree of accuracy of this car load road load extracting method.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the car load road load extracting method of first embodiment of the invention;
Fig. 2 is the schematic flow sheet of the car load road load extracting method of second embodiment of the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the embodiments of the present invention are explained in detail.But, persons of ordinary skill in the art may appreciate that in each embodiment of the present invention, proposing many ins and outs to make reader understand the application better.But, even without these ins and outs with based on the many variations of following embodiment and amendment, each claim of the application technical scheme required for protection also can be realized.
First embodiment of the invention provides car load road load extracting method, and as shown in Figure 1, the method comprises the following steps:
The finite element model on step 101, the finite element model setting up chassis, the finite element model of tire, the finite element model of vehicle body and road surface.
For the finite element model of the finite element model on chassis, the finite element model of tire and vehicle body, can by the 3-D geometric model file of the car load of automobile, import to pre-processing software, each part such as chassis, tire and vehicle body is carried out to grid division, composes material parameter, arranges contact, gives real quality to engine and cast member simultaneously.
Concrete, the finite element model on chassis is set up according to the shape and size of the chassis structure part of automobile during design, the finite element model on this chassis carries out stress and strain model by pre-processing software and obtains on the CAD (computer aided design) cad data of the chassis structure part of automobile, especially, give the actual mass of chassis structure part also will to the finite element model on chassis.In embodiments of the present invention, pre-processing software can be Presys software.Pre-processing software has a variety of, example, Ansys, Hypermesh and Ansa etc., and in practical engineering application, can select arbitrarily wherein a kind of as required, the present invention is not restricted this.
In pre-processing software, input the quality of the size of doughnut, the tire pressure of doughnut and doughnut, obtain the finite element model of tire through process.The method obtaining the finite element model of tire is herein similar with the method obtaining chassis finite element model, does not repeat them here.
During according to design, the shape of the vehicle body of automobile and size, adopt the method identical with the finite element model obtaining chassis to obtain the finite element model of vehicle body, then adjust the body quality of the finite element model of vehicle body, moment of inertia and centroid position.
In pre-processing software, select road surface as input, and according to the correlation parameter in road surface drawing during Pavement Design, example, the finite element model on road surface can be obtained according to parameters such as the curvature at the width on road surface, length, concavo-convex place and spacing.
It should be noted that, pre-processing software is the software of a kind of maturation in prior art, and its concrete method of work and principle are prior art, and the present invention does not repeat them here.
In addition, the material properties of the finite element model of vehicle body and the finite element model on road surface is rigid material.
Step 102, the finite element model of the finite element model on chassis, the finite element model of tire and vehicle body to be assembled, composition car load finite element model.
Step 103, assembled by the finite element model on car load finite element model and road surface, the movement velocity of setting car load finite element model, calculates physical parameter when car load finite element model runs on the finite element model on road surface.
In this step, physical parameter when car load finite element model runs on the finite element model on road surface can be calculated by Explicit Dynamics analysis software.Explicit Dynamics analysis software is the software of a kind of maturation in prior art, and its concrete method of work and principle are prior art, and the present invention does not repeat them here.Further, the physical parameter by calculating comprises the power of the operation of car load finite element model on road surface, acceleration, the displacement of each part, the load information etc. of each tie point of automobile.Explicit dynamic analysis software can using above-mentioned physical parameter as a text output.
Explicit dynamic analysis software has a variety of, example, Autodyn, LS-DYNA etc., and in practical engineering application, can select arbitrarily wherein a kind of as required, the present invention is not restricted this.
Step 104, from physical parameter, extract the load information of each tie point of car load finite element model.
The physical parameter that step 103 can obtain by the poster processing soft carries out graphic software platform.Embodiments of the present invention can read the load information of each tie point of car load finite element model in the patterned physical parameter of display, and the load information of this each tie point of car load finite element model is the load information of each tie point of automobile.
The poster processing soft has a variety of, example, Presys, Hyperview, LS-Prepost etc., especially, Presys is the software that pre-process and post-process is brought together, therefore, this software also has the function of the poster processing soft, also may be used in step 104 of the present invention.In practical engineering application, can select arbitrarily wherein a kind of as required, the present invention is not restricted this.
Embodiment of the present invention in terms of existing technologies, under the prerequisite of incorporeity automobile, utilizes a kind of computer emulation method first to set up finite element model, the finite element model of tire, the finite element model of vehicle body on chassis, and the finite element model on road surface; Then the finite element model of the finite element model on described chassis, described tire and the finite element model of described vehicle body are assembled, composition car load finite element model; Set certain movement velocity to again car load finite element model, then calculate physical parameter when car load finite element model runs on the finite element model on road surface by software; The last load information extracting each tie point of car load finite element model in this physical parameter.This car load road load extracting method can replace a large amount of experiments, save cost, and this load information can provide actual directive function at the preliminary stage of Automobile Design well.
Second embodiment of the present invention relates to car load road load extracting method.Second embodiment has done further improvement on the first embodiment basis, as shown in Figure 2, main improvements are: in second embodiment of the invention, after execution step 201, before step 203, first perform step 202: the rigidity of demarcating the finite element model of tire, the rigidity of the finite element model of tire comprises radial rigidity, lateral rigidity and turns to rigidity, finally performs step 204 and step 205 again.Because tire has very important effect in the method utilizing each tie point load of CAE extraction vehicle body, the precision height of tire, will directly affect the extraction accuracy of each tie point load.So, before tire model is assembled to whole vehicle model, need to demarcate the rigidity of tire: radial rigidity, lateral rigidity and turn to rigidity etc.
It should be noted that, in the present embodiment, step 201, step 203, step 204 and step 205 are identical respectively at step 101, step 102, step 103 and the step 104 in the first embodiment, and the present invention does not repeat at this.
Before obtaining finite element model in assembling, to the radial rigidity of the finite element model of tire, lateral rigidity and turn to rigidity etc. to demarcate, can improve the precision of tire, thus improve the degree of accuracy of this car load road load extracting method.
3rd embodiment of the present invention relates to car load road load extraction element, comprises with lower unit:
Newly-built unit, for setting up finite element model, the finite element model of tire, the finite element model of vehicle body on chassis respectively according to shape and size during Automobile Design, sets up the finite element model on road surface according to the correlation parameter in road surface drawing during Pavement Design.
Assembly unit, for the finite element model of the finite element model on chassis, the finite element model of tire and vehicle body is assembled, composition car load finite element model.
Processing unit, for being assembled by the finite element model of car load finite element model and road surface, the movement velocity of setting car load finite element model, calculates physical parameter when car load finite element model runs on the finite element model on road surface.
Extraction unit, for extracting the load information of each tie point of car load finite element model from physical parameter.
Wherein, the finite element model on the chassis of automobile carries out stress and strain model by pre-processing software and obtains on the CAD (computer aided design) cad data of the chassis structure part of automobile.The finite element model of tire is obtained by the quality of pre-processing software according to the size of doughnut, the tire pressure of doughnut and doughnut.The material properties of the finite element model of vehicle body and the finite element model on road surface is rigid material.
Embodiment of the present invention in terms of existing technologies, under the prerequisite of incorporeity automobile, a kind of computer emulation method is utilized first to be set up finite element model, the finite element model of tire, the finite element model of vehicle body on chassis by newly-built unit, and the finite element model on road surface; Then assembled by the finite element model of assembly unit by the finite element model on chassis, the finite element model of tire and vehicle body, composition car load finite element model; Set certain movement velocity by processing unit to car load finite element model again, then calculate physical parameter when car load finite element model runs on the finite element model on road surface by software; In this physical parameter, the load information of each tie point of car load finite element model is extracted finally by extraction unit.This car load road load extracting method can replace a large amount of experiments, save cost, can provide actual directive function well at the preliminary stage of Automobile Design.
4th embodiment of the present invention relates to car load road load extraction element.4th embodiment has done further improvement on the 3rd embodiment basis, main improvements are: in four embodiment of the invention, except newly-built unit, assembly unit, processing unit and extraction unit, this car load road load extraction element also comprises demarcation unit, this demarcation unit was used for before the finite element model of the finite element model on chassis, the finite element model of tire and vehicle body assembles by assembly unit, demarcate the rigidity of the finite element model of tire, the rigidity of the finite element model of tire comprises radial rigidity, lateral rigidity and turns to rigidity.
Before assembly unit assembling obtains finite element model, by demarcating unit to the radial rigidity of the finite element model of tire, lateral rigidity and turn to rigidity etc. to demarcate, can improve the precision of tire, thus improve the degree of accuracy of this car load road load extracting method.
It is worth mentioning that, be logic module about each module involved in the embodiment of device, in actual applications, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical location.The principle of work of each physical location can describing in reference method embodiment, and the present invention does not repeat them here.In addition, in order to outstanding innovative part of the present invention, the unit not too close with solving technical matters relation proposed by the invention is not introduced in present embodiment, but this does not show the unit that there is not other in present embodiment.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above realize specific embodiments of the invention, and in actual applications, various change can be done to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. a car load road load extracting method, is characterized in that, comprises the following steps:
S1, the finite element model setting up chassis according to shape and size during Automobile Design respectively, the finite element model of tire, the finite element model of vehicle body, set up the finite element model on road surface according to the correlation parameter in road surface drawing during Pavement Design;
S2, the finite element model of the finite element model on described chassis, described tire and the finite element model of described vehicle body to be assembled, composition car load finite element model;
S3, the finite element model on described car load finite element model and described road surface to be assembled, set the movement velocity of described car load finite element model, calculate physical parameter when described car load finite element model runs on the finite element model on described road surface;
S4, from described physical parameter, extract the load information of described each tie point of car load finite element model.
2. car load road load extracting method according to claim 1, is characterized in that, after described S2, before described S3, described method also comprises:
Demarcate the rigidity of the finite element model of described tire, the rigidity of the finite element model of described tire comprises radial rigidity, lateral rigidity and turns to rigidity.
3. car load road load extracting method according to claim 1, is characterized in that, the finite element model on the chassis of described automobile carries out stress and strain model by pre-processing software and obtains on the CAD (computer aided design) cad data of the chassis structure part of described automobile.
4. car load road load extracting method according to claim 1, is characterized in that, the finite element model of described tire is obtained by the quality of described pre-processing software according to the size of described doughnut, the tire pressure of described doughnut and described doughnut.
5. car load road load extracting method according to claim 1, is characterized in that, the material properties of the finite element model of described vehicle body and the finite element model on described road surface is rigid material.
6. a car load road load extraction element, is characterized in that, comprises with lower unit:
Newly-built unit, for setting up finite element model, the finite element model of tire, the finite element model of vehicle body on chassis respectively according to shape and size during Automobile Design, sets up the finite element model on road surface according to the correlation parameter in road surface drawing during Pavement Design;
Assembly unit, for the finite element model of the finite element model on described chassis, described tire and the finite element model of described vehicle body are assembled, composition car load finite element model;
Processing unit, for the finite element model of described car load finite element model and described road surface is assembled, set the movement velocity of described car load finite element model, calculate physical parameter when described car load finite element model runs on the finite element model on described road surface;
Extraction unit, for extracting the load information of each tie point of described car load finite element model from described physical parameter.
7. car load road load extraction element according to claim 6, it is characterized in that, described device also comprises:
Demarcate unit, before the finite element model of the finite element model on described chassis, described tire and the finite element model of described vehicle body being assembled at described assembly unit, demarcate the rigidity of the finite element model of described tire, the rigidity of the finite element model of described tire comprises radial rigidity, lateral rigidity and turns to rigidity.
8. car load road load extraction element according to claim 6, is characterized in that, the finite element model on the chassis of described automobile carries out stress and strain model by pre-processing software and obtains on the CAD (computer aided design) cad data of the chassis structure part of described automobile.
9. car load road load extraction element according to claim 6, is characterized in that, the finite element model of described tire is obtained by the quality of described pre-processing software according to the size of described doughnut, the tire pressure of described doughnut and described doughnut.
10. car load road load extraction element according to claim 6, is characterized in that, the material properties of the finite element model of described vehicle body and the finite element model on described road surface is rigid material.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106874540A (en) * | 2016-12-31 | 2017-06-20 | 华晨汽车集团控股有限公司 | Automated processing system based on chassis mount point static rigidity |
| JP2017128229A (en) * | 2016-01-20 | 2017-07-27 | 横浜ゴム株式会社 | Simulation method of pneumatic tire and evaluation method |
| CN107505139A (en) * | 2017-08-25 | 2017-12-22 | 北京新能源汽车股份有限公司 | A kind of vehicle method for testing fatigue and device |
| CN110298125A (en) * | 2019-07-03 | 2019-10-01 | 中汽研（天津）汽车工程研究院有限公司 | A kind of fatigue analysis method based on virtual test field technology |
| CN110309598A (en) * | 2019-07-03 | 2019-10-08 | 中汽研（天津）汽车工程研究院有限公司 | A kind of creation method of Virtual Test Field |
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2013
- 2013-12-03 CN CN201310642436.6A patent/CN104679930A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017128229A (en) * | 2016-01-20 | 2017-07-27 | 横浜ゴム株式会社 | Simulation method of pneumatic tire and evaluation method |
| CN106874540A (en) * | 2016-12-31 | 2017-06-20 | 华晨汽车集团控股有限公司 | Automated processing system based on chassis mount point static rigidity |
| CN107505139A (en) * | 2017-08-25 | 2017-12-22 | 北京新能源汽车股份有限公司 | A kind of vehicle method for testing fatigue and device |
| CN110298125A (en) * | 2019-07-03 | 2019-10-01 | 中汽研（天津）汽车工程研究院有限公司 | A kind of fatigue analysis method based on virtual test field technology |
| CN110309598A (en) * | 2019-07-03 | 2019-10-08 | 中汽研（天津）汽车工程研究院有限公司 | A kind of creation method of Virtual Test Field |
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Application publication date: 20150603 |