Each MC execution can read only one GHS component from a DXF from a specified range of layers. MC recognizes only LINE, POLYLINE, LWPOLYLINE, ARC and TEXT entities. It also allows components or individual stations from a Geometry File to be copied into a CAD drawing. This allows a shape to be created in a CAD program (including digitizing from an existing body plan) and then converted into a Geometry File for use within GHS. MC will read and write DXF files (2D or 3D). In this latter case, the relevant files in the indicated directory are converted and combined in one output Geometry File. Either single- or multiple-file conversions can be carried out with one MC execution. MC will convert individual HEC files of the. Conversion from GHS format to HEC format is not available. Model Converter will read these files, convert the geometry data to the GHS format, and write the result to a GHS Geometry File. Ship hull and tank geometry are carried in separate files. The GHS form of representation avoids this problem, since all area curves are closely related to the model as it appears by inspection. Even when the SHCP model is considered "clean" because no transverse "blips" are present, there may be "longitudinal blips" which would appear in the area curve only at certain waterplane orientations and would therefore be difficult to detect. One interesting feature of the SHCP-to-GHS conversion is that longitudinal and transverse aberrations (due to incorrect station spacing in the SHCP model) become visible after the conversion. MC adds these points and stations automatically. (SHCP bases its representation on the requirements of Simpson's first rule for area integration.) However, the GHS representation (based on the requirements of trapezoidal integration) requires roughly twice as many points and stations to achieve a comparable level of precision. So we would say that even if you are using SHCP you need MC to check for errors!Ĭompared to the SHCP method of representing hull geometry, GHS uses a simpler representation which is more reliable and more suitable for automatic computation. Many of these errors, if undetected, can lead to serious errors in SHCP calculations. ![]() However, MC does a much more thorough job of checking the SHCP offsets for errors than SHCP does itself. Since there is a significant difference in the way in which SHCP and GHS interpret offsets, MC reads and processes the SHCP data in the same manner in which SHCP does. Note: IGES, STEP, DWG, and many other CAD file formats can be converted to GF format using Rhinoceros 3-D NURBS Modelerįor a list of file conversions, please look here: Rhino File Conversions. SEASAFE (IN) hull definitions to GHS Geometry.PIAS (EAG) offsets to and from GHS Geometry.IMSA Data Files (IDF) to and from GHS Geometry. ![]()
0 Comments
Leave a Reply. |