【導(dǎo)讀】精確的解，這種理論上的缺陷可通過使用棱邊元方法予以消除。這種方法不但適用于靜態(tài)分。析，還適用于諧波和瞬態(tài)磁場分析。在大多數(shù)實(shí)際3-D分析中，推薦使用這種方法。元方法中，電流源是整個(gè)網(wǎng)格的一個(gè)部分，雖然建模比較困難，但對導(dǎo)體的形狀沒有控制，另外也正因?yàn)閷﹄娏髟匆惨獎(jiǎng)澐志W(wǎng)格，所以可以計(jì)算焦耳熱和洛倫茲力?！禔NSYS理論手冊》不同章節(jié)中討論了棱邊單元的公式。述、矩陣列式的討論、棱邊方法型函數(shù)的信息。對于ANSYS的SOLID117棱邊單元，自由度是矢量位A沿單元邊切向分量的積分。單元邊矢量是由較低節(jié)點(diǎn)號(hào)指向較高節(jié)點(diǎn)號(hào)。磁通量方向由封閉環(huán)路的方。向根據(jù)右手法則來判定。在ANSYS中，AZ表示邊通量自由度，它在MKS單位制中的單位是韋伯，在動(dòng)態(tài)問題中，8個(gè)角節(jié)點(diǎn)上持有時(shí)間。類型一樣，只是邊界條件不同），具體參見第7章，第8章。，用MainMenu>Preprocessor>-Modeling-界面，詳見《ANSYS建模與分網(wǎng)指。用AZ=0來模擬磁力線平行邊界條件，磁力線垂直邊界條件自然發(fā)生，無需說明。單元密度由ESYS命令在單

　　

【正文】 (ETABLE) option to store !data in a table for calculation purposes or print !data in a table format. Element table is convenient !when you need to sum data over the elements for !quantities such as energy, Joule losses, and forces. !Here the x ponent of element magic forces (FMAG) !are stored in table item, fe. ! ETABLE,hy,H,y! Store the y ponent of the magic field in !table item, hy. ! ETABLE,by,B,y! Store the y ponent of the flux density in !table item, by. ! ETABLE,jz,JT,z! Store the z ponent of the current density in !table item, jz. ! ETABLE,pd,JHEAT! Store the Joule heat rate per unit volume !(power density) in table item, pd. ! ETABLE,ve,VOLU! Store the element volume in table item, ve. ! ETABLE,we,SENE! Store the element magic energy (SENE) in table !item, we. This option is valid for !linear material regions (constant permeability). ! SMULT,pe,pd,ve! Use the SMULT mand to multiply the Joule heat !rate by the volume (average power), table items pd !and ve, respectively, in order to calculate total !losses, stored in table item, pe. ! PRETAB,ve,by,hy,we! Print element table items, ve,by,hy,we ! PRETAB,ve,jz,jh,pe! Print element table items, ve,jz,jh,pe ! PRETAB,ve,jz,by,fe! Print element table items, ve,jz,by,fe ! SSUM! Sum the entries in the element table for the currently !! selected provides a summed quantity !! over the problem domain for the element table items. ! *GET,ft,SSUM,ITEM,fe! Obtain (*GET) the result of the summation (SSUM) !operation of element table item, fe, and store the !the result in parameter variable, ft. (Same symbol !can be used (but not necessary to) as table item and !parameter variable.) The *GET mand can be used !to ask questions about ANSYS. You can ask, for example, !the number of nodes, elements, etc., the puted !potential at a given node... Here parameter, ft, stores !the sum of forces acting over the assembly of elements. !At the same time, table item, fe, stores the forces !acting on individual elements. ! *GET,wt,SSUM,ITEM,we! Obtain the total energy and store in parameter, wt. ! *GET,pt,SSUM,ITEM,pe! Obtain the total power and store in parameter, pt. ! *GET,vt,SSUM,ITEM,ve! Obtain the total volume and store in parameter, vt. ! *VWRITE,vt,ft,wt,pt! print parameters, vt, ft, wt and pt in a FORTRAN format (/volume=, force=, energy=, loss=,) ! FINISH! Exit post processor ! ! *** advanced part: coupling ! !Up to this point magics was considered only. !It is demonstrated below, how the results of a magic analysis !can be passed to subsequent thermal and/or structural analyses. ! ! *** couple with thermal analysis ! /PREP7! enter preprocessor !nodes and elements defined in the magic analysis !are used for the thermal analysis ! ET,1,90! change element type 1, which used to be a magic !element to a thermal element ! LDREAD,HGEN,,rmg ! Read heat generation (HGEN) load from the result file, !of the magic analysis which defaults to ! BFELIST,ALL,HGEN! List heat generation (HGEN) element body loads !Compare the list with the element Joule power loss ! FINI! Exit preprocessor !From this point on follow steps of a thermal analysis ! ! *** couple with structural analysis ! /PREP7! enter preprocessor !nodes and elements defined in the magic analysis !are used for the structural analysis ! ET,1,45! change element type 1, which used to be a magic !element to a structural element ! LDREAD,FORC,,rmg ! Read nodal force (FORCE) load from the result file, !of the magic analysis which defaults to ! FLIST! List nodal forces !Compare the list with the element nodal magic force !(FMAG) printout. Note that a nodal force for the !structural analysis is the sum of nodal magic forces !over elements adjacent to the pertinent node. ! FINI! Exit preprocessor !From this point on follow steps of a structural analysis