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发表于 2007-1-6 20:51:20
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来自 湖北武汉
翻译了好久,不知道确切不?请大家指教。
ESURF, XNODE, Tlab, Shape
Generates elements overlaid on the free faces of existing selected elements.
XNODE
Used only when generating SURF151 or SURF152 elements with KEYOPT(5) = 1. XNODE is the single extra node number (ID) used with these surface elements. There is no default. XNODE must be specified if KEYOPT(5) = 1. If XNODE = P, graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI). A parameter or parametric expression can be substituted for XNODE.
Tlab
Used to generate target and contact elements with correct direction of normals. This label is used only with TARGE169, TARGE170, CONTA171, CONTA172, CONTA173, and CONTA174 elements.
TOP — Generates target and contact elements over beam and shell elements with the normals the same as the underlying beam and shell elements (default).
BOTTOM — Generates target and contact elements over beam and shell elements with the normals opposite to the underlying beam and shell elements.
REVERSE — Reverses the direction of the normals on existing selected target and contact elements.
Shape
Used to specify the element shape for target element TARGE170.
(blank) — The target element takes the same shape as the external surface of the underlying element (default).
TRI — Generates several triangular facet target elements.
Notes
Generates elements of the currently active element type overlaid on the free faces of existing elements. For example, surface elements (SURF151, SURF152, SURF153, or SURF154) can be generated over solid elements (PLANE55, SOLID70, PLANE42, SOLID45, respectively). Element faces are determined from the selected node set [NSEL] and the load faces for that element type. The operation is similar to that used for generating element loads from selected nodes with the SF,ALL command, except that elements, instead of loads, are generated. All nodes on the face must be selected for the face to be used. For shell elements, only face one of the element is available. If nodes are shared by adjacent selected element faces, the faces are not free and no element will be generated. Elements created by ESURF will be oriented such that their surface load directions are consistent with those of the underlying elements. Generated elements, as well as their orientation, should be checked carefully. Generated elements use the existing nodes and the active MAT, TYPE, REAL, and ESYS attributes, except when Tlab = REVERSE. The reversed target and contact elements will have the same attributes as the original elements. If the underlying elements are solid elements, Tlab = TOP or BOTTOM has no effect.
By default, when the command generates a target element the shape will be the same as that of the underlying element. While not recommended, you can issue ESURF,,,TRI to generate several facet triangle elements.
ESURF is also used to generate 2-D or 3-D node-to-surface element CONTA175, based on the selected node components of the underlying solid elements. When used to generate CONTA175 elements, all ESURF arguments are ignored.
Regarding the GUI, if CONTA175 is the active element type, the path Main Menu> Preprocessor> Modeling> Create> Elements> Node-to-Surf will automatically use ESURF to generate elements.
Menu Paths
Main Menu>Preprocessor>Modeling>Create>Elements>Surf / Contact>Inf Acoustic
Main Menu>Preprocessor>Modeling>Create>Elements>Surf / Contact>Node to Surf
Main Menu>Preprocessor>Modeling>Create>Elements>Surf / Contact>Surf Effect>Generl Surface>Extra Node
Main Menu>Preprocessor>Modeling>Create>Elements>Surf / Contact>Surf Effect>Generl Surface>No extra Node
Main Menu>Preprocessor>Modeling>Create>Elements>Surf / Contact>Surf to Surf
ESURF, XNODE, Tlab, Shape
在已经存在的所选择的单元自由表面上生成重叠单元
XNODE:仅仅用于产生SURF151或SURF152单元,其中KEYOPT(5)=1.XNODE是一个单独特别的节点数(ID)用于上述0表面单元。它没有默认值。如果KEYOPT(5)=1时候,XNODE必须指定。如果XNODE=P时,用图形拾取,此时所有保存命令区域被忽略(仅当GUI时有效)。可以用一个参数或参数表达式来取代XNODE。
TLAB:用于产生在法向正向的目标和接触单元。这个选项仅仅用于TARGE169,ARGE170,CONTA171,CONTA172,CONTA173和CONTA174单元。
TOP-在梁和壳单元上面生成同法向方向一致的目标和接触单元(默认)。
BOTTOM-在梁和壳单元上面生成同发行方向相反的目标和接触单元。
REVERSE-在已经存在选择的目标和接触单元上的法向进行反向。
SHAPE:用于指定生成目标单元TARGE170的单元形状。BLANK-目标单元形状同其所覆盖下的单元的外表面形状相同(默认)。TRI-产生三角面的目标单元。
提示:
在已经存在的单元的自由表面上产生覆盖其上面的当前已经激活单元类型的单元。例如面单元(SURF151,SURF152,SURF153,或SURF154)能够产生覆盖在实体单元(PLANE55,SOLID70,PLANE42,SOLID45,分别)单元面由所选定的节点集和单元类型的载荷面确定。这个操作与利用SF,ALL命令所选中的节点产生单元载荷是相似的,除了单元,代替载荷都可以产生。对将要使用的面来说,其上的所有的节点都必须选中。对于壳体单元,它只有一个面是可以用的。如果节点也位于临近的单元上面,这些面都不是自由表面,因此也不能产生任何单元。用于ESURF产生的单元是有方向的,如此以致于他们的表面载荷方向也与其下面覆盖的电源方向一致。除了单元的方向,产生的单元的也要被小心的检查。除了当TLAB=REVERSE时,产生的单元使用已经存在的节点和激活的MAT,TYPE,REAL,和ESYS属性。旋转方向的目标和接触单元与初时时候单元的塑性是一样的。如果其下是实体单元,那么TLAB=TOP或BOTTOM是不起作用的。
默认情况下,当用这个命令产生目标安阳时候,它的单元形状与覆盖下的单元形状是一样的。当没有指定时候,你可以用ESURF,,,TRI产生一些三角单元。
ESURF也可以用于在实体单元上所选中的节点元件上产生2D或3D的点面单元CONTA175。当产生CONTA175单元时候,所有的ESURF选项都被忽略。
对于GUI,如果CONTA175是一个激活的单元类型,通过路径Main Menu> Preprocessor> Modeling> Create> Elements> Node-to-Surf可以自动通过ESURF产生单元。
Menu Paths
Main Menu>Preprocessor>Modeling>Create>Elements>Surf / Contact>Inf Acoustic
Main Menu>Preprocessor>Modeling>Create>Elements>Surf / Contact>Node to Surf
Main Menu>Preprocessor>Modeling>Create>Elements>Surf / Contact>Surf Effect>Generl Surface>Extra Node
Main Menu>Preprocessor>Modeling>Create>Elements>Surf / Contact>Surf Effect>Generl Surface>No extra Node
Main Menu>Preprocessor>Modeling>Create>Elements>Surf / Contact>Surf to Surf |
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