CN107169194A - A kind of finite element modeling method of automobile exhaust pipe muffler - Google Patents
A kind of finite element modeling method of automobile exhaust pipe muffler Download PDFInfo
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- CN107169194A CN107169194A CN201710330244.XA CN201710330244A CN107169194A CN 107169194 A CN107169194 A CN 107169194A CN 201710330244 A CN201710330244 A CN 201710330244A CN 107169194 A CN107169194 A CN 107169194A
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Abstract
A kind of finite element modeling method of automobile exhaust pipe muffler disclosed by the invention, including：To at flange part, air inlet pipe, inner tube, dividing plate, escape pipe, end cap, air inlet pipe and the barrel soldering at flange part, cylinder and the end cap of cylinder, escape pipe and end cap weld, inner tube and dividing plate weld, cylinder and dividing plate weld, cylinder carry out finite element modeling, obtain corresponding grid；Then material and attribute are created for above-mentioned grid, and the material created and attribute is assigned to corresponding grid respectively；Finally increase quality point, set up rigid element, mass calibration is integrally carried out to automobile exhaust pipe muffler.Present invention modeling is accurate, number of grid is less, mesh quality is higher and easy implementation, it is adaptable to computer-aided engineering field.
Description
Technical field
The invention belongs to the technical field of computer-aided engineering, and in particular to a kind of automobile exhaust pipe muffler it is limited
Meta Model method.
Background technology
Automobile exhaust pipe muffler is mainly fabricated by by light sheet, for reducing vehicle noise.In mechanical oscillation, air-flow
Under impact and heat effect, to realize the requirement of its acoustic characteristic and aerodynamic demands, muffler must have good structure
Design (contains material), meets certain intensity, rigidity and dynamics (mode, response spectrum analysis etc.) requirement.Traditional muffler
The method that structure design is mainly combined using the experience and many experiments of designer, time length, cost are high.With computer
Hardware continue to develop and software application it is increasingly mature, blast pipe can be studied using the method for computer simulation emulation
The structure design of muffler, or combination is optimized, to reach the shortening design cycle, reduce unnecessary manpower and materials consumption
Purpose, realizes modernization, the precision of muffler design.
Finite element method is to apply a kind of most ripe, widest numerical computation method at present, and it utilizes mathematical approach
Method is simulated to actual physical system (geometry and load working condition).The basic process of finite element solving problem mainly includes：
Pre-treatment (setting up FEM model, referred to as model), finite element solving, the part of post processing three of result of calculation.Wherein, modeling master
There are GTD model, mesh generation, attribute to set, load and solve the contents such as setting.The quality of FEM model is directly affected
To the time of solution and the accuracy of solving result.
In existing literature, the research for the method for building up of muffler finite element structural analysis model is few.Wherein,
《The model analysis of Single cavity expansion silencer and structure are improved》(document one), which has only been briefly touched upon, uses Ansys 3D solid lists
First Solid45 sets up model；《Applications of the HyperWorks in silencer modal calculation》Modeling side disclosed in (document two)
Method is as follows：All using Shell units, thickness is defined, mesh generation is carried out to thin plate；Overlapped with node and replace welding；Inner tube
Circular hole replaced with square hole.Relative to the method in document one, the method in document two employs Shell units to carry out grid
Divide, the lattice number that Billy is obtained with hexahedron grid division is many less, and mesh quality is more preferably, improves to a certain extent
Computational efficiency.
But, in above two method：(1) specific implementation steps and method are not all disclosed；(2) weldering is not all accounted for
Seam, still, the stress of weld seam itself and periphery will can not be analyzed by ignoring weld seam, and cause larger quality error and Mass Distribution
Error, it is impossible to truly reflect statics and dynamic performance of the muffler under vibration, gas shock and heat effect；(3)
For the processing of flange, although slightly referred in document two, but it starts to ignore, finally mends the method drawn, and destruction is existing
Grid model, add modeling difficulty；(4) model causes the difference of gross mass because ignoring tiny characteristics and weld seam, necessarily, right
The precision influence of result of calculation is big, and both of which does not account for the correction of quality.Accordingly, it would be desirable to which a kind of modeling is accurate, grid
Quantity is less, mesh quality is higher and the modeling technique of the muffler of easy implementation, with carry out the intensity of muffler, rigidity and
The simulation analysis of mode.
The content of the invention
The present invention overcomes the shortcomings of that prior art is present, and technical problem to be solved is：One kind is provided and models accurate, net
The finite element modeling method for the automobile exhaust pipe muffler that lattice quantity is less, mesh quality is higher and easily implements.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of automobile exhaust pipe muffler has
Meta Model method is limited, the automobile exhaust pipe muffler includes：Cylinder, end cap, inner tube, air inlet pipe, dividing plate and escape pipe, it is described
Air inlet pipe and the cylinder, the escape pipe and the end cap, said inner tube and the dividing plate, the escape pipe and the dividing plate
By weld connection, the cylinder is in itself, the cylinder coupled with the end cap by flange.
Described finite element modeling method includes：Finite element modeling is carried out to the flange part of cylinder, cylinder flange is obtained
Grid；Finite element modeling is carried out to the flange part at cylinder and end cap, the grid of cylinder and flange at end cap is obtained；To entering
Tracheae carries out finite element modeling, obtains the grid of air inlet pipe；Finite element modeling is carried out to inner tube, the grid of inner tube is obtained；To every
Plate carries out finite element modeling, obtains the grid of dividing plate；Finite element modeling is carried out to escape pipe, the grid of escape pipe is obtained；Opposite end
Lid carries out finite element modeling, obtains the grid of end cap；To carrying out finite element modeling at air inlet pipe and barrel soldering, air inlet pipe is obtained
With the grid at barrel soldering；Finite element modeling is carried out to escape pipe and end cap weld, escape pipe and end cap weld is obtained
Grid；Finite element modeling is carried out to inner tube and dividing plate weld, the grid of inner tube and dividing plate weld is obtained；To cylinder with every
Finite element modeling is carried out at plate weld, the grid of cylinder and dividing plate weld is obtained；Finite element modeling is carried out to cylinder, cylinder is obtained
The grid of body；And material and attribute are created for above-mentioned grid, and the material created and attribute are assigned to corresponding net respectively
Lattice；Increase quality point, set up rigid element, mass calibration is integrally carried out to automobile exhaust pipe muffler.
Preferably, it is described to carrying out finite element modeling at air inlet pipe and barrel soldering, specifically include：Set up whole circle tetrahedron
Unit, hexahedral element, and overlapped with the surface grids node of air inlet pipe, cylinder contact position；It is described that escape pipe and end cap are welded
Place carries out finite element modeling, specifically includes：Set up it is whole circle tetrahedron element, hexahedral element, and with escape pipe, end cap contact position
Surface grids node overlap；It is described that finite element modeling is carried out to inner tube and dividing plate weld, specifically include：Circumferentially set up whole circle
Tetrahedron element, hexahedral element, cell node overlaps with the surface grids node at inner tube, baffle contacts；It is described to cylinder
Finite element modeling is carried out with dividing plate weld, is specifically included：Discrete tetrahedron element is set up along cylinder circumference, spot welding is represented,
Cell node is overlapped with the surface grids node at cylinder, baffle contacts.
Preferably, the flange part to cylinder carries out finite element modeling, specifically includes：During extraction flange is two-part
Face, deletes folding part facet at flange, with the smooth filling breach of plane, instead of flange herein, divides the grid of fill surface；It is described
Finite element modeling is carried out to the flange part at cylinder and end cap, specifically included：The middle face of end cap is extracted, deletes and is folded at flange
Face in part face, axial tension cylinder, instead of flange herein, divides the grid of Extrude Face.
Preferably, it is described that finite element modeling is carried out to air inlet pipe, specifically include：The middle face of air inlet pipe is extracted, in weld
Cut, divide the surface grids of weld；Continue to cut, divide transitional trellis；Finally divide remaining part grid；It is described right
Inner tube carries out finite element modeling, specifically includes：The middle face of inner tube is extracted, is cut in the weld with dividing plate, welding is divided
Locate the surface grids of inner tube；Divide remaining part grid；Uniformly delete the aperture in single grid protocol inner tube；It is described to escape pipe
Finite element modeling is carried out, is specifically included：The middle face of escape pipe is extracted, is cut in weld, the surface grids of weld are divided；
Continue to cut, divide transitional trellis；Finally divide remaining part grid；It is described that finite element modeling is carried out to dividing plate, specifically include：
The middle face of dividing plate is extracted, is cut in weld, the surface grids of weld are divided；Finally divide remaining part grid；It is described
Finite element modeling is carried out to end cap, specifically included：The middle face of end cap is extracted, surface grids are divided；With flange contact position node pair
It should overlap；It is described that finite element modeling is carried out to cylinder, specifically include：Divide the surface grids of weld；Divide the veil at flange
Lattice, divide transitional trellis；Finally divide remaining part grid.
Preferably, the increase quality point, sets up rigid element, and quality school is integrally carried out to automobile exhaust pipe muffler
Just, specifically include：The quality of existing grid model is measured, compared with actual geometrical model quality, increases quality point and gives scarce
Few quality, and set up one-dimensional rigid element with shell portion node.
Preferably, it is described to create material and attribute for above-mentioned grid, specifically include：Specify the thickness of each several part, material with
Cell type.
The present invention has the advantages that compared with prior art：
1st, the present invention is to consider flange initial stage in modeling, rather than ignores when starting as in the prior art, finally sends out
Existing quality problems, it is further added by flange, it is to avoid the modification and destruction to existing model, reduces modeling difficulty, save modeling
Time；
Moreover, the present invention accurately establishes weld seam unit, weld seam itself and the stress on periphery can be analyzed so that muffler
Mass Distribution is approached with truth, it is to avoid larger mass discrepancy, can truly reflect the mechanical property of muffler；
In addition, last carry out mass calibration of the present invention in modeling, it is ensured that build FEM model and actual almost T-stable
It is equal, it is to avoid the influence of quality and rigidity to result of calculation.
2nd, the present invention is all using the surface grids and tetrahedron of quadrangle, hexahedral volume mesh, triangle-free grid, net
Lattice quality is greatly improved；
Moreover, the present invention employs grid transitional technology in most faces, and only in tiny characteristics and concern position
Using small size grid, so that number of grid is greatly decreased, follow-up calculating speed is improved.
Brief description of the drawings
The present invention will be further described in detail below in conjunction with the accompanying drawings；
Fig. 1 is a kind of geometrical model of existing automobile exhaust pipe muffler provided in an embodiment of the present invention；
Fig. 2 is to be set up according to a kind of finite element modeling method of automobile exhaust pipe muffler provided in an embodiment of the present invention
FEM model；
The enlarged drawing that Fig. 3 is A in Fig. 2；
The enlarged drawing that Fig. 4 is B in Fig. 2；
The enlarged drawing that Fig. 5 is C in Fig. 2；
The enlarged drawing that Fig. 6 is D in Fig. 2；
The enlarged drawing that Fig. 7 is E in Fig. 2；
In figure：101 be cylinder, and 102 be end cap, and 103 be inner tube, and 104 be air inlet pipe, and 105 be dividing plate, and 106 be escape pipe.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments；Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
A kind of finite element modeling method of automobile exhaust pipe muffler, the geometrical model of the automobile exhaust pipe muffler is such as
Shown in Fig. 1, it may include：Cylinder 101, end cap 102, inner tube 103, air inlet pipe 104, dividing plate 105 and escape pipe 106, the air inlet
Pipe 104 and the cylinder 101, the escape pipe 106 and the end cap 102, said inner tube 103 and the dividing plate 105, it is described go out
Tracheae 106 is with the dividing plate 105 by weld connection, and the cylinder 101 itself, the cylinder 101 and the end cap 102 are equal
Coupled by flange.
Described finite element modeling method includes：
Finite element modeling is carried out to the flange part of cylinder 101, the grid of the flange of cylinder 101 is obtained.
Finite element modeling is carried out to the flange part at cylinder 101 and end cap 102, cylinder 101 is obtained with being turned at end cap 102
The grid on side.
Finite element modeling is carried out to air inlet pipe 104, the grid of air inlet pipe 104 is obtained.
Finite element modeling is carried out to inner tube 103, the grid of inner tube 103 is obtained.
Finite element modeling is carried out to dividing plate 105, the grid of dividing plate 105 is obtained.
Finite element modeling is carried out to escape pipe 106, the grid of escape pipe 106 is obtained.
Finite element modeling is carried out to end cap 102, the grid of end cap 102 is obtained.
Finite element modeling is carried out to air inlet pipe 104 and the weld of cylinder 101, air inlet pipe 104 and the weld of cylinder 101 is obtained
Grid.
Finite element modeling is carried out to escape pipe 106 and the weld of end cap 102, escape pipe 106 and the weld of end cap 102 is obtained
Grid.
Finite element modeling is carried out to inner tube 103 and the weld of dividing plate 105, the net of inner tube 103 and the weld of dividing plate 105 is obtained
Lattice.
Finite element modeling is carried out to cylinder 101 and the weld of dividing plate 105, the net of cylinder 101 and the weld of dividing plate 105 is obtained
Lattice.
Finite element modeling is carried out to cylinder 101, the grid of cylinder 101 is obtained.
And：
Material and attribute are created for above-mentioned grid, and the material created and attribute are assigned to corresponding grid respectively.
Increase quality point, set up rigid element, mass calibration is integrally carried out to automobile exhaust pipe muffler.
Specifically, it is described that finite element modeling is carried out to air inlet pipe 104 and the weld of cylinder 101, specifically it may include：Set up whole
Tetrahedron element, hexahedral element are enclosed, and is overlapped with the surface grids node of air inlet pipe 104, the contact position of cylinder 101.
It is described that finite element modeling is carried out to escape pipe 106 and the weld of end cap 102, specifically it may include：Set up whole circle four sides
Body unit, hexahedral element, and overlapped with the surface grids node of escape pipe 106, the contact position of end cap 102.
It is described that finite element modeling is carried out to inner tube 103 and the weld of dividing plate 105, specifically it may include：Circumferentially set up whole circle
Tetrahedron element, hexahedral element, cell node overlaps with the surface grids node of inner tube 103, the contact position of dividing plate 105.
It is described that finite element modeling is carried out to cylinder 101 and the weld of dividing plate 105, specifically it may include：Built along the circumference of cylinder 101
Vertical discrete tetrahedron element, represents spot welding, and cell node is overlapped with the surface grids node of cylinder 101, the contact position of dividing plate 105.
Specifically, the flange part to cylinder 101 carries out finite element modeling, specifically may include：Extract flange two
The middle face divided, deletes folding part facet at flange, with the smooth filling breach of plane, instead of flange herein, divides the net of fill surface
Lattice.
The flange part at cylinder 101 and end cap 102 carries out finite element modeling, specifically includes：Extract end cap 102
Middle face, delete folding part facet at flange, face in axial tension cylinder 101, instead of flange herein, divides the net of Extrude Face
Lattice.
Specifically, it is described that finite element modeling is carried out to air inlet pipe 104, specifically it may include：The middle face of air inlet pipe 104 is extracted,
Cut in weld, divide the surface grids of weld；Continue to cut, divide transitional trellis；Finally divide remaining part net
Lattice.
It is described that finite element modeling is carried out to inner tube 103, specifically it may include：Extract inner tube 103 middle face, with dividing plate 105
Weld cut, divide the surface grids of weld inner tube 103；Divide remaining part grid；Uniformly delete single grid
Aperture in formed inner tube.
It is described that finite element modeling is carried out to escape pipe 106, specifically it may include：The middle face of escape pipe 106 is extracted, in weld
Cut, divide the surface grids of weld；Continue to cut, divide transitional trellis；Finally divide remaining part grid.
It is described that finite element modeling is carried out to dividing plate 105, specifically it may include：The middle face of dividing plate 105 is extracted, is carried out in weld
Cutting, divides the surface grids of weld；Finally divide remaining part grid.
It is described that finite element modeling is carried out to end cap 102, specifically it may include：The middle face of end cap 102 is extracted, surface grids are divided；
Overlapped corresponding with flange contact position node.
It is described that finite element modeling is carried out to cylinder 101, specifically it may include：Divide the surface grids of weld；Divide at flange
Surface grids, divide transitional trellis；Finally divide remaining part grid.
Specifically, the increase quality point, sets up rigid element, and quality school is integrally carried out to automobile exhaust pipe muffler
Just, specifically it may include：The quality of existing grid model is measured, compared with actual geometrical model quality, increases quality point and gives
The quality lacked, and set up one-dimensional rigid element with the part of nodes of cylinder 101.
Specifically, it is described to create material and attribute for above-mentioned grid, specifically it may include：Specify thickness, the material of each several part
With cell type.
Below by taking the geometrical model shown in Fig. 1 as an example, more careful explanation is done to the method in the present invention：If all
Sheet metal thickness is 2mm, and identical material is Q235；Weld material stainless steel 304；Muffler gross mass 8Kg.Specific modeling side
Method is as follows：
The first step：The modeling of cylinder flange includes：
New component is created, cylinder flange is named as, the grid to deposit cylinder flange；
The two-part middle face of flange is extracted, folding part facet at flange is deleted, is filled with plane is smooth to replace flange；
Divide the grid of fill surface；
The material and attribute definition of flange：It is that cylinder flange creates material and attribute according to design point, and will be created
Material and attribute be assigned to cylinder flange.Cylinder material in the present embodiment is Q235, and thickness is 2mm, therefore flange thickness is set to 4
× 2=8mm.It is that cylinder creates material and attribute according to these information, and is assigned to the cylinder flange of this step establishment, cell type
For two-dimensional cell.
Second step：Cylinder includes with flange modeling at end cap：
New component is created, barrel body end cover flange is named as, the grid to deposit barrel body end cover flange；
Cylinder and the folding part facet at end cap flange are deleted, respectively face in axial tension cylinder, length is physical length,
Instead of two ends flange；
Divide the grid of Extrude Face；
The material and attribute definition of flange：It is that cylinder creates material and attribute with end cap flange according to design point, and will
The material and attribute created is assigned to cylinder and end cap flange.The material of cylinder and end cap in the present embodiment is all Q235, is turned over
Side thickness is set to 4 × 2=8mm.Be that cylinder creates material and attribute according to these information, and be assigned to the cylinder of this step establishment with
End cap flange, cell type is two-dimensional cell.
3rd step：Air inlet pipe modeling includes：
New component is created, air inlet pipe is named as, the grid to deposit air inlet pipe；
The middle face of air inlet pipe is extracted, is cut respectively in weld, grid transition position；
Divide surface grids, transitional trellis, the remaining part grid of weld；
The material and attribute definition of air inlet pipe：It is that air inlet pipe creates material and attribute according to design point, and will be created
Material and attribute be assigned to air inlet pipe.Air inlet tube material is Q235 in the present embodiment, and thickness is 2mm.According to these information be into
Tracheae creates material and attribute, and is assigned to the air inlet pipe of this step establishment, and cell type is two-dimensional cell.
4th step：Inner tube modeling includes：
New component is created, inner tube is named as, the grid to deposit inner tube；
The middle face of inner tube is extracted, is cut in the weld with dividing plate；
Divide the surface grids of weld inner tube；
Divide remaining part grid；Uniformly delete the aperture in single grid protocol inner tube；
The material and attribute definition of inner tube：It is that inner tube creates material and attribute according to design point, and by the material created
Material and attribute are assigned to inner tube.Inner tube material is Q235 in the present embodiment, and thickness is 2mm.It is that inner tube creates material according to these information
Material and attribute, and the inner tube of this step establishment is assigned to, cell type is two-dimensional cell.
5th step：Escape pipe modeling includes：
New component is created, escape pipe is named as, the grid to deposit escape pipe
The middle face of escape pipe is extracted, is cut in weld, the surface grids of weld are divided；
Continue to cut, divide transitional trellis；
Finally divide remaining part grid；
The material and attribute definition of escape pipe：It is that escape pipe creates material and attribute according to design point, and will be created
Material and attribute be assigned to escape pipe.Outlet tube material is Q235 in the present embodiment, and thickness is 2mm.It is according to these information
Tracheae creates material and attribute, and is assigned to the escape pipe of this step establishment, and cell type is two-dimensional cell.
6th step：Dividing plate modeling includes：
New component is created, dividing plate is named as, the grid to deposit dividing plate
The middle face of dividing plate is extracted, is cut in weld,
Divide the surface grids of weld；
Finally divide remaining part grid；
The material and attribute definition of dividing plate：It is that dividing plate creates material and attribute according to design point, and by the material created
Material and attribute are assigned to dividing plate.The present embodiment median septum material is Q235, and thickness is 2mm.It is that dividing plate creates material according to these information
Material and attribute, and the dividing plate of this step establishment is assigned to, cell type is two-dimensional cell.
7th step：End cap modeling is included：
New component is created, end cap is named as, the grid to deposit end cap
The middle face of end cap is extracted, surface grids are divided；Overlapped corresponding with flange contact position node；
The material and attribute definition of end cap：It is that end cap creates material and attribute according to design point, and by the material created
Material and attribute are assigned to end cap.Cap material is Q235 in present case, and thickness is 2mm.It is that end cap creates material according to these information
And attribute, and the end cap of this step establishment is assigned to, cell type is two-dimensional cell.
8th step：Air inlet pipe includes with modeling at barrel soldering：
New component is created, weld seam is named as, the grid to deposit all weld seams；
Continuous whole tetrahedron, hexahedron weld seam unit, unit size 2.5mm are set up along air inlet pipe circumference；
Overlap tetrahedron, hexahedral element node and the surface grids node of air inlet pipe, cylinder contact position.
9th step：Escape pipe includes with the modeling of end cap weld：
Continuous whole tetrahedron, hexahedron weld seam unit, unit size 2.5mm are set up along escape pipe circumference；
Overlap tetrahedron, hexahedral element node and the surface grids node of escape pipe, end cap contact position.
Tenth step：Inner tube includes with the modeling of dividing plate weld：
Continuous whole tetrahedron, hexahedron weld seam unit, unit size 2.5mm are set up along inner tube circumference；
Tetrahedron, hexahedral element node is set to be overlapped with the surface grids node at inner tube, baffle contacts.
11st step：Cylinder is included with the modeling of dividing plate weld：
According to model actual conditions, tetrahedron weld seam unit is circumferentially set up, size is 2.5mm；
The present embodiment is spot welding at circumferencial direction eight, so being represented with discrete unit；Each weld seam is with four cell lists
Show spot welding 10mm at one；
Tetrahedron element node is overlapped with the surface grids node at inner tube, baffle contacts；
Weld material and attribute definition：According to design point it is that all weld seams create material and attribute, and will be created
Material and attribute are assigned to all weld seams.Weld material is stainless steel 304 in the present embodiment.Created according to these information for weld seam
Material and attribute, and be assigned to Step 8: nine, ten, 11 weld seams created, cell type is three-dimensional element.
12nd step：Cylinder modeling is included：
New component is created, cylinder is named as, the grid to deposit all cylinders；
Divide the surface grids of weld；
Divide the surface grids at flange；
Divide transitional trellis；
Finally divide remaining part grid；
The material and attribute definition of cylinder：It is that cylinder creates material and attribute according to design point, and by the material created
Material and attribute are assigned to cylinder.Cylinder material is Q235 in the present embodiment, and thickness is 2mm.It is that cylinder creates material according to these information
And attribute, and the cylinder of this step establishment is assigned to, cell type is two-dimensional cell.
13rd step：Correction to blast pipe total quality includes：
The quality for measuring existing grid model is 7.5Kg, compared with actual geometrical model quality 8Kg, tries to achieve and lacks quality
For 0.5Kg；
In body centre position, one transient node of increase gives the quality 0.5Kg lacked as quality point；
New component is created, rigid element is named as, to deposit the grid for correction mass；
Using this transient node as isolated node, middle cylinder part of nodes is, from node, to set up one-dimensional rigid element；
Examination network model quality again.
The extraction in face and the definition and tax of cutting, mesh generation, the addition of quality point, material and attribute in above-mentioned geometry
Give, can be achieved using existing ripe commercialization pre-processing software.
So far, the FEM model of muffler is fully completed, as shown in Fig. 2 A is cylinder and end cap flange part, B be into
Tracheae and cylinder weld seam part, C are dividing plate and cylinder weld seam part, and D is inner tube and dividing plate weld seam part, and E is escape pipe and end
Lid weld seam part, F is cylinder flange part, and G is mass calibration part, and H is cylinder grid transition portion.Pass through boundary condition
The setting of setting, the application of load and output, by the analysis calculating about finite element solving software, can obtain muffler
Rigidity, intensity, dynamic performance, and then auxiliary exhaust pipe design engineer quickly and accurately assesses the mechanical property of muffler.
Using the modeling pattern of the present invention, using the teaching of the invention it is possible to provide more accurate FEM model, the modeling time is saved, grid is improved
Quality, reduces number of grid, so as to improve calculating solving speed, more can accurately simulation muffler static mechanical performance (rigidity,
Intensity) and dynamic performance, provide more reliable finite element analysis for further Optimal improvements and support.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (6)
1. a kind of finite element modeling method of automobile exhaust pipe muffler, the automobile exhaust pipe muffler includes：Cylinder
(101), end cap (102), inner tube (103), air inlet pipe (104), dividing plate (105) and escape pipe (106), the air inlet pipe (104)
With the cylinder (101), the escape pipe (106) and the end cap (102), said inner tube (103) and the dividing plate (105),
The escape pipe (106) and the dividing plate (105) are by weld connection, the cylinder (101) itself, the cylinder (101)
Coupled with the end cap (102) by flange；
It is characterized in that：Described finite element modeling method includes：
Finite element modeling is carried out to the flange part of cylinder (101), the grid of cylinder (101) flange is obtained；
Finite element modeling is carried out to the flange part at cylinder (101) and end cap (102) place, cylinder (101) and end cap (102) is obtained
Locate the grid of flange；
Finite element modeling is carried out to air inlet pipe (104), the grid of air inlet pipe (104) is obtained；
Finite element modeling is carried out to inner tube (103), the grid of inner tube (103) is obtained；
Finite element modeling is carried out to dividing plate (105), the grid of dividing plate (105) is obtained；
Finite element modeling is carried out to escape pipe (106), the grid of escape pipe (106) is obtained；
Finite element modeling is carried out to end cap (102), the grid of end cap (102) is obtained；
Finite element modeling is carried out to air inlet pipe (104) and cylinder (101) weld, air inlet pipe (104) is obtained and is welded with cylinder (101)
Connect the grid at place；
Finite element modeling is carried out to escape pipe (106) and end cap (102) weld, escape pipe (106) is obtained and is welded with end cap (102)
Connect the grid at place；
Finite element modeling is carried out to inner tube (103) and dividing plate (105) weld, inner tube (103) and dividing plate (105) weld is obtained
Grid；
Finite element modeling is carried out to cylinder (101) and dividing plate (105) weld, cylinder (101) and dividing plate (105) weld is obtained
Grid；
Finite element modeling is carried out to cylinder (101), the grid of cylinder (101) is obtained；And
Material and attribute are created for above-mentioned grid, and the material created and attribute are assigned to corresponding grid respectively；
Increase quality point, set up rigid element, mass calibration is integrally carried out to automobile exhaust pipe muffler.
2. a kind of finite element modeling method of automobile exhaust pipe muffler according to claim 1, it is characterised in that：
It is described that finite element modeling is carried out to air inlet pipe (104) and cylinder (101) weld, specifically include：Set up whole circle tetrahedron
Unit, hexahedral element, and overlapped with the surface grids node of air inlet pipe (104), cylinder (101) contact position；
It is described that finite element modeling is carried out to escape pipe (106) and end cap (102) weld, specifically include：Set up whole circle tetrahedron
Unit, hexahedral element, and overlapped with the surface grids node of escape pipe (106), end cap (102) contact position；
It is described that finite element modeling is carried out to inner tube (103) and dividing plate (105) weld, specifically include：Circumferentially set up whole circle
Tetrahedron element, hexahedral element, cell node are overlapped with the surface grids node of inner tube (103), dividing plate (105) contact position；
It is described that finite element modeling is carried out to cylinder (101) and dividing plate (105) weld, specifically include：Built along cylinder (101) circumference
Vertical discrete tetrahedron element, represents spot welding, cell node and cylinder (101), the surface grids node weight of dividing plate (105) contact position
Close.
3. a kind of finite element modeling method of automobile exhaust pipe muffler according to claim 1, it is characterised in that：
The flange part to cylinder (101) carries out finite element modeling, specifically includes：The two-part middle face of flange is extracted, is deleted
Except folding part facet at flange, with the smooth filling breach of plane, instead of flange herein, the grid of fill surface is divided；
The flange part to cylinder (101) and end cap (102) place carries out finite element modeling, specifically includes：Extract end cap
(102) middle face, deletes face in folding part facet at flange, axial tension cylinder (101), instead of flange herein, divides stretching
The grid in face.
4. a kind of finite element modeling method of automobile exhaust pipe muffler according to claim 3, it is characterised in that：
It is described that finite element modeling is carried out to air inlet pipe (104), specifically include：The middle face of air inlet pipe (104) is extracted, is entered in weld
Row cutting, divides the surface grids of weld；Continue to cut, divide transitional trellis；Finally divide remaining part grid；
It is described that finite element modeling is carried out to inner tube (103), specifically include：Extract inner tube (103) middle face, with dividing plate (105)
Weld cut, divide weld inner tube (103) surface grids；Divide remaining part grid；Uniformly delete single net
Aperture in lattice formed inner tube；
It is described that finite element modeling is carried out to escape pipe (106), specifically include：The middle face of escape pipe (106) is extracted, is entered in weld
Row cutting, divides the surface grids of weld；Continue to cut, divide transitional trellis；Finally divide remaining part grid；
It is described that finite element modeling is carried out to dividing plate (105), specifically include：The middle face of dividing plate (105) is extracted, is cut in weld
Cut, divide the surface grids of weld；Finally divide remaining part grid；
It is described that finite element modeling is carried out to end cap (102), specifically include：The middle face of end cap (102) is extracted, surface grids are divided；
It is corresponding with flange contact position node to overlap；
It is described that finite element modeling is carried out to cylinder (101), specifically include：Divide the surface grids of weld；Divide the face at flange
Grid, divides transitional trellis；Finally divide remaining part grid.
5. according to a kind of finite element modeling method of any described automobile exhaust pipe muffler in Claims 1 to 4, its feature
It is：The increase quality point, sets up rigid element, integrally carries out mass calibration to automobile exhaust pipe muffler, specifically includes：
The quality of existing grid model is measured, compared with actual geometrical model quality, increases quality point and gives the quality lacked,
And set up one-dimensional rigid element with cylinder (101) part of nodes.
6. according to a kind of finite element modeling method of any described automobile exhaust pipe muffler in Claims 1 to 4, its feature
It is：It is described to create material and attribute for above-mentioned grid, specifically include：
Specify thickness, material and the cell type of each several part.
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