[建模]請問有人遇過這個問題嗎??

Unable to build simulation model near solid 3H5<w4yk  
Could not generate mesh. i,/Q.XL  
請問有人模擬時遇過這個問題可以幫忙我解決 .. %%Wn:c>  
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应该是你的建模有问题吧。

Was the model imported from other CAD software?

我是利用其他軟體匯入的方式~~

最好还是在CST里面建模，我也试过导入，很少成功， )]/gu\90  
而且我们老师说，相同的模型，不同的软件的结果也是会有差别的。 SM;*vkwz~  
要用CST计算，还是在这里建模吧，就照着原来的建么，也不是很麻烦。

引用第3楼chain于2010-05-12 17:48发表的  : 3X;k c>  
我是利用其他軟體匯入的方式~~ e(=() :4is  

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Strongly recommond you to read the Help file: "CAD Data Import and Export Overview". The following are some selected parts. x|b52<dLL&  
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The structural import process usually consists of two steps: ]9 JLu8GO  
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Import of the geometrical data and its conversion into ACIS models. Note that the origin of the imported CAD model will automatically be adjusted to the origin of the currently active coordinate system. 1fK]A*{p  
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Healing of the newly created ACIS models in order to obtain valid geometry. xU1_L*tu '  
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The first step can be seen as a pure geometric language translation step. All inaccuracies in the imported models remain during this stage. The second step then repairs the data so that valid ACIS models are obtained. g<E[IR  
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In general, problems during the import and healing process arise from different accuracy levels of the CAD system and the ACIS kernel used in CST STUDIO SUITE™. The accuracy of a CAD system is usually the distance for which the system considers two points to be identical. The ACIS kernel uses an accuracy of 1e-6 whereas some other CAD systems operate at accuracies of 1e-3 only. D-/q-=zd  
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Assuming that the CAD data have been created on a system with an accuracy level of 1e-3, it may easily contain gaps of this size (which the CAD system would still consider to be closed). Importing such a model into the ACIS kernel afterward would keep these gaps. However, in contrast to the less accurate CAD system, ACIS would not consider these gaps to be closed which may consequently cause failures in creating solids. To circumvent these problems, sophisticated automatic healing technology can be used to close the gaps in the imported model. P<
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When importing 2D models JdM0f!3  
Even though the import of 2D files is usually much less critical than the import of 3D models, problems may sometimes occur. The following hints should help to make the import as robust as possible: 4'+g/i1S F  
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Organize your structure into layers. Always put the structural drawing and additional data (such as hatchings, measure lines, text, etc.) on different layers, and only import the structural layers. 3 T1,:r  
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Only import those parts you are actually interested in. Since CST STUDIO SUITE™ needs to build 3D objects from the 2D input data, the complexity of the model is heavily increased during the import process. The deletion of unwanted objects after importing the complete structure is unnecessarily inefficient. 'mELW)S  
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Try to use polygons in the drawing of the 2D files as opposed to a collection of independent lines. Due to some accuracy constraints or a less accurate drawing, independent lines may have gaps, which must be closed with much effort during the import process. "1l$]=C*  
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The following list of rules applies to all types of file formats and should help you get the best results for importing CAD data 6e;POW  
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Keep the complexity reasonably low: Bear in mind that you are going to run an electromagnetic analysis with your models. Importing an entire car including details, such as the door locks for instance, will exceed today’s computational resources. Please import only the most relevant parts for highly complex models (e.g. the car’s body). zA>LrtyK(=  
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Avoid unnecessary blends in the CAD model: Excessive application of blends will also increase the complexity in the data. You should always try to avoid unnecessary blens and other complex shape details (e.g. embossed text) in the exported files whenever possible. [.(,vn?6  
Avoid tiny model sizes: Due to the limited numerical precision in the file formats, you should use units in which the model has reasonably large absolute dimensions. If your model has a bounding box diagonal of 0.1 m, for instance, you should export it in mm in order to get a larger absolute diagonal of 100 (mm). aw923wEi  
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Avoid Boolean operations before exporting the model: Whenever possible, you should try to avoid Boolean operations between parts before exporting the model to a file. In the example of the STL import shown earlier, the problem is due to the insertion of a cylinder into a plate, which then contains a hole. If the insertion were omitted in this case, inserting the imported and healed shapes within CST STUDIO SUITE™ would not cause any problems. This issue is most critical when faceted CAD data are used (e.g. STL) but still should be considered for the other more accurate data formats as well. 0"F|)  
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Try different export options: Whenever you experience problems in any of the data translation steps, you should try to use different export options for your CAD system. You may need to experiment a bit in order to find the combination which works best for your system and your type of models.