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发表于 2009-5-27 15:05:56
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来自 福建厦门
Multibody Collectors
Setting collector type to multibodies in the collectors panel provides functionality for the creation and modification of multibody collectors. Multibody collectors serve multiple purposes:
• Organizing HyperMesh’s ellipsoids, mbplanes, and mbjoints entities.
• Hold and define rigid body properties for multi-body analysis.
• Provide the rigid body reference for ellipsoids, cylinders, and planes.
Create a Multibody Collector
The create sub-panel is used for creating multibody collectors. create provides four data blocks for defining: the collector’s name, card image type, center of gravity, and the body’s local coordinate system. Moments of inertia and other rigid body properties are defined in the multibody collector’s card image, which is access through the card panel after the multibody collector has been created.
The name= text field is provided for specifying a name for the multibody collector being created and for reviewing the names of already existing multibodies. The name= field supports names up to 160 characters in length.
creation method: assigns the multibody type specified in the card image= field. The types of multibody collectors available are dependent on the loaded solver interface specified as a template file in the global panel. The most common type of multibody collector is a "rigid body". Setting creation method: to no card image specifies that a multibody collector type is be assigned at the time of creation but one can be assigned later in the card image sub-panel. Setting creation method: to same as assigns a copy of the card image of another multibody collector to the created collector. Using or not using a card image has no bearing on how multibody collectors behave within HyperMesh and only effect data being exported.
center of gravity: provides an N1 node/geometry selection box to define the x, y, and z, location of the center of gravity. The N1 box contains the same functionality as the N1 selection buttons found elsewhere in HyperMesh. To define a center of gravity location, select a node on in the model window. If only surfaces or lines are available for selection, click and hold left mouse button in the model window until the cursor becomes a square, drag the cursor over geometry to select it, release the mouse button, click anywhere on the geometry to define a location. For an alternative method to define the center of gravity, click on the edit button under the N1 selection box to bring up x=, y=, and z= entry fields.
Note: The element handles option in the modeling sub-panel (options panel) allows you to display the center of gravity for multibody collectors and text labels for 1D elements.
body local system: defines the body local coordinate system of the created body by assigning a local coordinate system entity to the multibody collector. There are three ways to define the body’s orientation. body system assigns a copy of the local coordinate system assigned to the current multibody collector specified in the global panel. duplicate system ensures a unique coordinate system is assigned to the created body by creating a duplicate of the selected coordinate system and assigning this duplicated coordinate system to the created body. use system assigns the selected system to the created body.
Update a Multibody Collector
The update sub-panel is provided to modify the body’s local coordinate system and center of gravity. The same fields and options available in the create sub-panel are also available in the update sub-panel. To modify the name of a multibody collector, the rename panel is available in the far left column of every HyperMesh page.
Define, Change, Review, and Reset a Multibody Collector
The card image sub-panel is used to define, change, review and reset the multibody collector type. The multibody types available are based on the template loaded in the global panel. |
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