CN104123410A - Motorcycle frame harmonic response analysis method - Google Patents
Motorcycle frame harmonic response analysis method Download PDFInfo
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- CN104123410A CN104123410A CN201410334055.6A CN201410334055A CN104123410A CN 104123410 A CN104123410 A CN 104123410A CN 201410334055 A CN201410334055 A CN 201410334055A CN 104123410 A CN104123410 A CN 104123410A
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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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- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/82—Elements for improving aerodynamics
Abstract
The invention discloses a motorcycle frame harmonic response analysis method. The method comprises the steps of establishing a motorcycle frame harmonic response model, establishing a motorcycle frame analysis model, and conducting frame modal analysis. According to the method, a large amount of test analysis work in a motorcycle frame test room can be replaced with the finite element method, a large amount of development and test cost can be saved, and development cycle is shortened.
Description
Technical field:
What the present invention relates to is the humorous response analysis method of a kind of frame of motorcycle.
Background technology:
Frame of motorcycle is the spine of whole motorcycle, it is not only supporting engine, rider and other assembly, also play the caused torsional deformation of various loads suppressing from front and back wheel, and provide the good effect such as control stability and comfortable riding to rider, therefore vehicle frame itself must there are enough strength and stiffness and also quality little.Along with China is to the improving constantly of the various performance requirements of motorcycle, adopt finite element model to analyze and just seem extremely important frame of motorcycle.
Adopt at present finite element analysis model generally to have following two kinds: beam element model and built-up pattern etc.Beam element model is that motorcycle structure is reduced to the framed structure being made up of the beam element of one group of two node, reflects the practical structures characteristic of motorcycle with the cross section property of beam element.Its advantage is: number of unit and the nodes of division are few, and computing velocity is fast and model pre-treatment workload is little, is applicable to primary election scheme.Its shortcoming is: cannot carefully analyze motorcycle problem of stress concentration, thereby can not provide practical help for the longitudinal and transverse beam connection scheme of motorcycle.Assembled unit model is that both to have adopted beam element also to adopt plate shell unit to carry out discrete.In Practical Project uses, the structure being formed by a series of thin-walled parts due to car beam, and complex-shaped, should discretely be the group collection of many plate shell units.Its shortcoming is that pre-treatment workload is large, computing time is long, but along with the development of computer technology, this problem has obtained good solution, and owing to there being FEM software to support, the huge pre-treatment workload overwhelming majority can be completed by computing machine, difficulty that neither restraining plate shell meta-model practice.This model makes the analytical calculation of motorcycle more accurate, can help for motorcycle design provides more favorably.But the accuracy of finite element analysis result is directly related with set up Autobike Mode, consider that model coincide with actual, computing time is long, and design cost is larger.
Summary of the invention:
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of frame of motorcycle humorous response analysis method.
In order to solve the existing problem of background technology, the present invention by the following technical solutions:
The humorous response analysis method of a kind of frame of motorcycle, it comprises the following steps:
Step 1: the foundation of the humorous response model of motorcycle: be line, surface model by model simplification;
Step 2: the foundation of frame of motorcycle analytical model;
Step 3: Frame modality analysis: vehicle frame is tested, experimental result is compared with notional result.
Further, in step 1, the foundation of the humorous response model of motorcycle, comprises the following steps:
(1) from Pro/Engineer, directly model is imported to PRATRAN;
(2) model importing is done to suitable reparation;
(3) plate that plays connection function in frame of motorcycle is removed;
(4) center line of extraction model pipe, makes the interface point, cross dimensions change point of frame member as the breakpoint of center line;
(5) plane of symmetry of extraction housing;
(6) check that whether simplified model is entirety, simplified model whether with the key dimension of master mould vehicle frame, comprise length and to turn to the negative sweep of standpipe identical.
Further, in step 2, the foundation of frame of motorcycle analytical model, comprises the following steps:
(1) grid is divided: divide all simple line faces with automatic mesh generator Iso-mesh, then divide remaining curved surface with Paver; The topological form of all curves is the beam/bar unit of 2 nodes, and the topological form of all curved surfaces is the quadrilateral units of 4 nodes; Line face partition length is 15mm;
(2) create frame materials: create a kind of isotropic material, its material parameter is: elastic modulus E=2.2*105N/mm2, Poisson ratio P=0.3, density p=7.8*10-9t/mm3;
(3) designating unit characteristic.
The present invention contrasts prior art, has following beneficial effect: utilize finite element method can replace the lot of experiments analytical work of frame of motorcycle testing laboratory, save a large amount of development experiments expenses, shortened the construction cycle.
Accompanying drawing and explanation:
Fig. 1 is the geometric model of frame of motorcycle.
Fig. 2 is the simplified model of frame of motorcycle.
Fig. 3 is the ELEMENT MESH GRAPH of vehicle frame.
Fig. 4 is vehicle frame finite element element characteristics demonstration figure.
Fig. 5 is the inventive method process flow diagram.
Embodiment:
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Fig. 5 is the process flow diagram of the inventive method.The humorous response analysis method of a kind of frame of motorcycle, it comprises the following steps:
Step 1: the foundation of the humorous response model of motorcycle: be line, surface model by model simplification;
Step 2: the foundation of frame of motorcycle analytical model;
Step 3: Frame modality analysis: vehicle frame is tested, experimental result is compared with notional result.
1. the foundation of the humorous response model of motorcycle
Fig. 1 is the geometric model of frame of motorcycle.The geometric model that directly reads in certain frame of motorcycle from Pro/Engineer, obtains Fig. 1, due to the model data possibility partial loss importing, thus the model of input is edited to repairing again in PATRAN, and model is simplified.
The body frame structure for automotive of motorcycle is the space frame structure being combined by the steel pipe of various cross sectional shapes substantially, and its sectional dimension, comprise diameter, wall thickness, very little compared with member length, therefore be very suitable for selecting pipe, the plate shell unit in space to carry out discrete body frame structure for automotive, though and the interpolation precision of the solid elements such as hexahedron is high, be still not only difficult to grid division with its discrete frame of motorcycle, also cause the increase greatly of computational costs; Simulate reinforcement with spatial shell element; Select interface point, cross dimensions change point, load point and the supporting-point etc. of frame member as node.
Therefore, we are line, surface model by model simplification, obtain Fig. 2, to select the pipe in space, plate shell unit to carry out discrete body frame structure for automotive, have so both ensured computational accuracy, can reduce widely computing time again, reduce computational costs.Fig. 2 is the simplified model of frame of motorcycle.
Concrete, the foundation of the humorous response model of motorcycle comprises the following steps:
(1) from Pro/Engineer, directly model is imported to PRATRAN;
(2) model importing is done to suitable reparation;
(3) plate that plays connection function in frame of motorcycle is removed;
(4) center line of extraction model pipe, makes the interface point, cross dimensions change point of frame member as the breakpoint of center line;
(5) plane of symmetry of extraction housing;
(6) check that whether simplified model is entirety, simplified model whether with the key dimension of master mould vehicle frame, comprise length and to turn to the negative sweep of standpipe identical.
Through above step, just set up the simplification geometric model of frame of motorcycle.
2. the foundation of frame of motorcycle analytical model
(1) grid is divided
After establishing the geometric model of motorcycle, just can, to model partition grid, prepare analytical calculation.When grid division, to note following some:
1) each several part must connect as a wholely, and face and face, face and line, line and line product have not allowed gap.Finite element analysis is to transmit various constraint condition and load by interconnective unit, if the each several part of Autobike Mode is not connected to each other, not an entirety, the unit of division is by discontinuous, constraint condition and load also can not be transmitted over, cause analysis distortion.
2) will select suitable unit size grid division, stressed evenly greatly optional to the little position unit size of analyzing influence, that should divide the key component grid of analyzing is thinner truly to reflect the truth of model.
In sum, for accurately reflecting the actual conditions of vehicle frame, repeatedly by different grid makers, different topological forms, different grid density degree, this type frame of motorcycle is carried out to grid division.Through final comparison, determine first to select automatic mesh generator Iso-mesh to divide all simple line faces, then divide remaining curved surface (Surface 2,503 2505) with Paver; The topological form of all curves is the beam/bar unit (Bar) of 2 nodes, and the topological form of all curved surfaces is the quadrilateral units (Quad) of 4 nodes; Line face partition length is 15mm.
In the time that grid is divided, in the time having common limit between two geometry, should note the harmony of these two geometry, ensure the consistance of division unit.If two geometry are coordinated, in the time of automatic grid division, PATRAN can make two geometry automatically be consistent at the grid of intersection.If but inconsistent between two geometry, directly grid division can cause the inconsistent of how much unit grids, so, should first be eliminated.In the time of automatic grid division, often can produce again duplicate node at how much that coordinate, such node need to check and process, otherwise can not carry out correct analytic operation." Verify " is used for model to check, and " Equivalence " is used for eliminating the node repeating.
Process through above, whole vehicle frame model has finally been divided 1457 nodes, 1382 unit.(Fig. 3)
(2) create frame materials
Body frame structure for automotive is the space frame being combined by the steel pipe of various cross sectional shapes substantially, so we have created a kind of isotropic material (Steel), its material parameter is: elastic modulus E=2.2*105N/mm2, Poisson ratio P=0.3, density p=7.8*10-9t/mm3.
(3) designating unit characteristic
This type motorbike frame is steel pipe steel plate combination vehicle frame, is welded by steel pipe and steel stamping part, combines the feature of steel pipe and copper coin, has good overall characteristic.By baroque part in the alternative steel pipe vehicle frame of steel stamping part, by the part of simple shape in steel pipe instead of steel wooden handcart frame.Dividing when finite element grid, analyzed with pipe, the discrete body frame structure for automotive of plate shell unit in space be most suitable.So according to the actual conditions of vehicle frame, the property list (table 1) of designating unit, element characteristic show that figure (Fig. 4) is as follows:
The each element characteristics of table 1 frame of motorcycle
Beam: beam element is cell type conventional in a kind of engineering, can bear axial push-pull, torsion and flecition.Meet the characteristic of steel pipe.
Shell: plate shell unit, be mainly used in simulating bent shell, be the flat unit that can bear tensile, compressive, bending, cut.Meet the characteristic of steel plate.
3. Frame modality analysis
The correctness of established model in order to verify, should test motorcycle, find the motorcycle natural frequency that its natural frequency and finite element fraction are separated out to compare, but, motorcycle experiment has certain difficulty, so vehicle frame is tested, experimental result is compared with notional result, verify that with this whether the model of being set up is correct, carry out correction model with experimental result.
Carry out model analysis in order to upper model, the natural frequency that obtains vehicle frame is as follows:
Mode1：Freq.＝55.394
Mode2：Freq.＝77.215
Mode3：Freq.＝84.424
Mode4：Freq.＝100.95
Mode5：Freq.＝141.41
Mode6：Freq.＝173
Mode7：Freq.＝216.25
Mode8：Freq.＝225.31
Mode9：Freq.＝234.24
Mode10：Freq.＝257.3
Mode11：Freq.＝272.04
Mode12：Freq.＝287.49
Mode13：Freq.＝323.74
Mode14：Freq.＝329.52
Mode15：Freq.＝372.29
Mode16：Freq.＝382.14
Make comparisons with experimental result (experimental data is provided by CAD/CAM application project research institute experiment test group), as shown in (table 2):
The comparison of table 2 vehicle frame experimental result and finite element analysis result
| Experiment natural frequency (Hz) | Finite element analysis natural frequency (Hz) | Analyze and experimental error (%) |
| 73 | 77.215 | 5.77 |
| 102 | 100.95 | 1.03 |
| 143 | 141.41 | 1.11 |
| 179 | 173 | 3.35 |
| 205 | 216.25 | 5.49 |
| 234 | 234.24 | 0.10 |
As can be seen from the above results, the result of vehicle frame finite element analysis and experimental result differ and are no more than 6%, are (error analyses) substantially conforming to, so, we think that built finite element model is correct, have higher confidence level with the analytical calculation that this model carries out.
4. conclusion
Utilize finite element method can replace the lot of experiments analytical work of frame of motorcycle testing laboratory, save a large amount of development experiments expenses, shortened the construction cycle.Setting up correct finite element model is the most important condition of carrying out finite element analysis.Finite element analysis will be separated many simultaneous equations, relatively expends time in, and therefore, while setting up finite element model, will simplify Autobike Mode, catches principal contradiction.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. the humorous response analysis method of frame of motorcycle, is characterized in that, it comprises the following steps:
Step 1: the foundation of the humorous response model of motorcycle: be line, surface model by model simplification;
Step 2: the foundation of frame of motorcycle analytical model;
Step 3: Frame modality analysis: vehicle frame is tested, experimental result is compared with notional result.
2. the humorous response analysis method of a kind of frame of motorcycle according to claim 1, is characterized in that, in step 1, the foundation of the humorous response model of motorcycle comprises the following steps:
(1) from Pro/Engineer, directly model is imported to PRATRAN;
(2) model importing is done to suitable reparation;
(3) plate that plays connection function in frame of motorcycle is removed;
(4) center line of extraction model pipe, makes the interface point, cross dimensions change point of frame member as the breakpoint of center line;
(5) plane of symmetry of extraction housing;
(6) check that whether simplified model is entirety, simplified model whether with the key dimension of master mould vehicle frame, comprise length and to turn to the negative sweep of standpipe identical.
3. the humorous response analysis method of a kind of frame of motorcycle according to claim 1, is characterized in that, in step 2, the foundation of frame of motorcycle analytical model, comprises the following steps:
(1) grid is divided: divide all simple line faces with automatic mesh generator Iso-mesh, then divide remaining curved surface with Paver; The topological form of all curves is the beam/bar unit of 2 nodes, and the topological form of all curved surfaces is the quadrilateral units of 4 nodes; Line face partition length is 15mm;
(2) create frame materials: create a kind of isotropic material, its material parameter is: elastic modulus E=2.2*105N/mm2, Poisson ratio P=0.3, density p=7.8*10-9t/mm3;
(3) designating unit characteristic.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108647378A (en) * | 2018-03-30 | 2018-10-12 | 东风商用车有限公司 | A kind of secondary development devices and methods therefor being applied in vehicle frame modeling |
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| CN103398859A (en) * | 2013-08-19 | 2013-11-20 | 重庆理工大学 | Force-displacement hybrid control motorcycle frame fatigue test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103398859A (en) * | 2013-08-19 | 2013-11-20 | 重庆理工大学 | Force-displacement hybrid control motorcycle frame fatigue test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108647378A (en) * | 2018-03-30 | 2018-10-12 | 东风商用车有限公司 | A kind of secondary development devices and methods therefor being applied in vehicle frame modeling |
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Application publication date: 20141029 |