做彈簧劃分網(wǎng)格

1、hekie做彈簧劃分網(wǎng)格如題 bigbird在臺灣論壇上的題目，下圖是我做的，感覺有意思。 做出部分也可以上傳，積分鼓勵大家思考一下，試著做一下 可以提示一下 先造線，再由面沿線生成體 雨人 我在HELP中COPY的一點(diǎn)有關(guān)內(nèi)容，與該題有關(guān)，希望和我一樣   沒用過該命令的同學(xué)，看過后，都能試著做一下。我也在試著做。   我想這個(gè)命令做螺紋時(shí)同樣適用。       VEXT, NA1, NA2, NINC, DX, DY, DZ, RX, RY, RZ Generates additi

2、onal volumes by extruding areas.   PREP7:Volumes   MP ME ST DY PR EM EH FL PP ED   NA1, NA2, NINC Set of areas (NA1 to NA2 in steps of NINC) that defines the pattern to be extruded. NA2 defaults to NA1, NINC defaults to 1. If NA1 = ALL, NA2 and NINC are ignored and the

3、pattern is defined by all selected areas. If NA1 = P, graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI). A component name may also be substituted for NA1 (NA2 and NINC are ignored).   DX, DY, DZ Increments to be applied to the X, Y, and Z key

4、point coordinates in the active coordinate system (DR, D, DZ for cylindrical; DR, D, D for spherical).   RX, RY, RZ Scale factors to be applied to the X, Y, and Z keypoint coordinates in the active coordinate system (RR, R, RZ for cylindrical; RR, R, R for spherical). Note that the R and R

5、 scale factors are interpreted as angular offsets. For example, if CSYS = 1, RX, RY, RZ input of (1.5,10,3) would scale the specified keypoints 1.5 times in the radial and 3 times in the Z direction, while adding an offset of 10 degrees to the keypoints. Zero, blank, or negative scale factor values

6、are assumed to be 1.0. Zero or blank angular offsets have no effect.   Notes Generates additional volumes (and their corresponding keypoints, lines, and areas) by extruding and scaling a pattern of areas in the active coordinate system.   If element attributes have been associate

7、d with the input area via the AATT command, the opposite area generated by the VEXT operation will also have those attributes (i.e., the element attributes from the input area are copied to the opposite area). Note that only the area opposite the input area will have the same attributes as the input

8、 area; the areas adjacent to the input area will not.   If the areas are meshed or belong to meshed volumes, a 3-D mesh can be extruded with this command. Note that the NDIV argument on the ESIZE command should be set before extruding the meshed areas.   Scaling of the input area

9、s, if specified, is performed first, followed by the extrusion.   In a non-Cartesian coordinate system, the VEXT command locates the end face of the volume based on the active coordinate system. However, the extrusion is made along a straight line between the end faces. Note that solid mod

10、eling in a toroidal coordinate system is not recommended.   Caution: Use of the VEXT command can produce unexpected results when operating in a non-Cartesian coordinate system. For a detailed description of the possible problems that may occur, see Solid Modeling in the ANSYS Modeling and

11、Meshing Guide.   If the area that is being extruded (used as the pattern for the resulting volume) with the VROTAT, VEXT, VOFFST, or VDRAG command is meshed (or belongs to a meshed volume), that mesh will be used as a pattern for the mesh of the volume that is created (see Extruding Meshed

12、 Areas). (Compare these commands to the VSWEEP command, which is described in Sweeping Volumes.)   If you are interested in extruding your mesh, follow these steps:   Mesh the area that is to be extruded, dragged, offset, or rotated (using MESH200 elements).   Select an

13、 appropriate 3-D element type ET (match the shape and number of nodes to the MESH200 element). Activate the selection TYPE.   Specify the desired number of element divisions in the extruded, rotated, or offset direction (NDIV argument on ESIZE command). If using VDRAG, specify the number o

14、f element divisions on the drag path line(s) (LESIZE or ESIZE,NDIV).   Issue the VROTAT, VEXT, VOFFST, or VDRAG command.   Concatenated areas ACCAT or areas that have concatenated lines LCCAT cannot be extruded. You can get around the concatenated line limitation by first meshing

15、 the area(s), then deleting the concatenated lines, and finally extruding the area(s) into meshed volume(s).   If element attributes have been associated with the pattern area via the AATT command, the opposite area generated by the VDRAG, VEXT, VOFFST, or VROTAT operation will also have t

16、hose attributes (i.e., the element attributes from the pattern area are copied to the opposite area). Note that only the area opposite the pattern area will have the same attributes as the pattern area; the areas adjacent to the pattern area will not.   Use the following command to make th

17、e generation of meshed volumes from 2-D models easier:    Command(s):   Use the following command to make the generation of meshed volumes from 2-D models easier:    Command(s): EXTOPT   GUI: Main Menu&gtreprocessor> Modeling&

18、;gt; Operate> Extrude> Elem Ext Opts  Main Menu> Preprocessor> Meshing> Mesh> Volume Sweep> Sweep Opts    EXTOPT controls options relating to the generation of volume elements from area elements using the VEXT, VROTAT, VO

19、FFST, VDRAG, and VSWEEP commands. It enables carry-over of material attributes, real constant attributes, and element coordinate system attributes of the pattern area elements to the created volume elements (except for VSWEEP as noted below).   The EXTOPT control options include the follow

20、ing:   When using VEXT, VROTAT, VOFFST, or VDRAG, you can set controls to carry-over material attributes, real constant attributes, and element coordinate attributes of the pattern area elements to the meshed volume elements. (When using VSWEEP, since the volume already exists, use the VAT

21、T command to assign attributes before sweeping.)   When using VEXT, VROTAT, VOFFST, or VDRAG, you can set controls to carry-over particular attributes (materials, real constants or element coordinate systems) of the pattern area elements to the generated volume elements or you can set cont

22、rols to use particular attributes (material, real constants or element coordinate systems) of the current MAT, REAL, and ESYS command settings for the generated volume elements.   You can set controls to set the number of element divisions and spacing ratio in the direction of volume gener

23、ation.   When using VEXT, VROTAT, VOFFST, or VDRAG, you can set controls to clear the pattern area mesh when volume generations are done. (When you are using VSWEEP, if selected, the area meshes on the pattern (source), target, and/or side areas clear when volume sweeping is done.)  &

24、#160;The carry-over of the attributes of the pattern area elements saves you time that would otherwise be required to prepare the 3-D model extrusion of multiple areas with differing attributes.   Figure 5.13. Extruding (and Scaling) Meshed Areas Into Meshed Volumes   .3. Sweepin

25、g Volumes To fill an existing unmeshed volume with elements by sweeping the mesh from an adjacent area throughout the volume:    Command(s): VSWEEP   GUI: Main Menu> Preprocessor> Meshing> Mesh> Volume Sweep> Sweep   When you

26、 use the VROTAT, VEXT, VOFFST, and VDRAG commands to extrude a meshed area into a meshed volume, ANSYS creates the volume and the volume mesh simultaneously. In contrast, you use the VSWEEP command in an existing unmeshed volume. Thus VSWEEP is particularly useful when you are importing a solid mode

27、l that was created in a CAD program.   For detailed information about volume sweeping, see Generating a Volume Mesh By Sweeping of this manual, as well as the description of the VSWEEP command in the ANSYS Commands Reference.seansheu端面雨人實(shí)體見附圖  單元圖為：mars_88看看能不能得分。我的螺旋線是分段做的，不知有沒有

28、一次做好的方法？端面單元為shell93，實(shí)體的是solid95。 aser 圖1雨人/PREP7 wpoff,-10 CYL4, , ,1  ET,1,MESH200 ET,2,SOLID45 KEYOPT,1,1,6 KEYOPT,1,2,0 LESIZE,ALL,10,1  MSHAPE,0,2D  MSHKEY,1 AMESH,ALL   CSYS,0   WPAVE,0,0,0  CSYS,0   !*   CSYS

29、,1        KBETW,3,1,0,RATI,0.5,    *do,i,1,72 k,5+i,10,180-i*10,i lstr,5+i,4+i *enddo *do,i,1,72 VDRAG,1+(i-1)*5, , , , , ,4+i eplot *enddozxlCSYS,1   *AFUN,DEG /prep7 ET,1,45 *do,i,0,36,1   x=10   y=10*i   z=i/2 k,i+1,x

30、,y,z *enddo   *do,j,1,36,1 L,j,j+1 *enddo   *do,i,0,35,1 LWPL,-1,i+1,0 CYL4,0,0,1 *enddo   *do,i,1,36,1 VDRAG, i, , , , , , i, , , , , *enddo    vglue,all TYPE,1 vmesh,allspring_zj回復(fù)： 【推薦】積分鼓勵，做彈簧劃分網(wǎng)格我在SOLIDWORKS 下面建立彈簧模型，再轉(zhuǎn)到ANSYS下面SWEP單元，采用SOLID95單元?？纯慈绾危?csh

31、ufen所謂三變彈簧是變剛絲直徑，變螺距，變?nèi)降淖儎偠葟椈?，這種彈簧在國外的越野汽車上很是時(shí)毛，有興趣的可以做一下。有水平的作個(gè)三變彈簧77152587首先繪出中心線 x=cost,y=sint,z=vt，其中控制旋轉(zhuǎn)速度，v控制螺旋上升速度（即可以控制旋轉(zhuǎn)一圈螺旋彈簧上升的高度），以及橫截面； 然后面沿線操作即可得到螺旋彈簧，當(dāng)然只需要畫一周，再復(fù)制。這樣是可以的，t為時(shí)間變量，由于正弦、余弦函數(shù)為以2為周期的周期函數(shù)，所以只需要畫一個(gè)周期即可，然后復(fù)制就得到等距的螺旋彈簧。如果想得到變距離的螺旋彈簧，只需要將速度變量設(shè)置為變速的。 superalloy 看看這個(gè)。三變彈簧。lo

32、velybunny  我編的。MAC文件，用法將此文件拷貝到ANSYS的工作目錄下，然后在命令窗口打ring1命令即可，運(yùn)行后會彈出對話框，設(shè)置參數(shù)后，自動進(jìn)行建模，此程序?qū)嵭袇?shù)化建模。通過修改對話框中的參數(shù)即可獲得不同的已經(jīng)劃分網(wǎng)格的FEA模型。fini/cle/filname,ring,1/prep7*AFUN,DEGmultipro,'start',3 *cset,1,3,N_num,'Enter the loop nmuber',5 *cset,4,6,p_dis,'Enter the pitch',0.8 *cset,7,9

33、,rid,'Enter the spring main radius',1 *cset,10,12,rid2,'Enter the spring section radius',0.1 *cset,61,62,'The ring1 macro creat',' the sping you wanted'multipro,'end'TOT=12N=TOT*N_num !整個(gè)彈簧的點(diǎn)數(shù)cic=360et,1,45 !彈簧采用的單元et,2,200 !給面劃網(wǎng)格的MESH200單元keyopt,2,1,6DIV=cic/TOT !兩點(diǎn)將的圓心角DIS=p_dis/TOT !螺距csys,1*DO,I,1,N+1k,I,rid,(I-1)*DIV,(I-1)*DIS*ENDDOflst,3,N+1,3*do,i,1,N+1fitem,3,i*enddobsplin,p51xcsys,0wprot,90wpoff,ridpcirc,rid2,0,360asel,a