Point at Profile Section
- Last UpdatedDec 08, 2025
- 4 minute read
This sub-syntax may be used to define a topology point by reference to a profile cross section. The section may be either with the plane of the current panel or with principal planes in the local coordinate system of the panel or in the ship coordinate system.
Syntax
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<profile_section>::= ,CRO / ,<ext_prof_ref> [,REF] \ < > (1 ... 25) \ ,<int_prof_ref> / [ ,<plane> ] ( [ TOP | FLA [,DIS] [,DIR] ] ) | ( [ SID ] [,FLA] [,DIR] ) [ ,M1 = <offs_dir1> ] [ ,M2 = <offs_dir2> ] [ ,PER[PENDICULAR] ] |
Description
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CRO |
Indicates profile section. |
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<ext_prof_ref> |
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<int_prof_ref> |
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Note: References to pillars are supported. |
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<plane> |
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Normally the profile is supposed to be intersected by the plane of the current panel (on the side indicated by MSIDE, see above). This clause allows the profile to be intersected by a plane perpendicular to an axis of the global or local coordinate system. |
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<plane>::= U|V|X|Y|Z = <coord> |
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Normally, the intersection point with the plane is calculated as the intersection with the mold line (trace) of the profile. However, there are different possibilities to get another intersection point. |
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TOP |
Moves the point to the top of the profile section. |
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FLA |
Moves the point to the side of the flange against the web. |
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DIR |
(= AFT|FOR|PS|SB|TOP|BOT). Moves the point to the flange in the indicated direction (should be used primarily for pillars which normally have flanges in two directions). If combined with FLA the point will be on the "inwards" side of the flange. |
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DIS |
Moves the point to the non-mold line side of the web of the profile. Should be used only for profile types where the mold line is one side of the web. |
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SID |
Moves the point to the edge of the flange in the given direction. In this case TOP is not required. The result will be as though the flange was a profile (flat bar) of its own. |
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M1 |
Defines an offset in the primary direction. |
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M2 |
Defines an offset in the secondary direction. |
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PER |
Means that the measure will be measured perpendicularly to the profile trace, for example, to give a correct overlap of a bracket. |
The picture below shows the keywords used to reach certain node points of a T-bar (without any offsets and deltas and without the use of SIDE). 'Basic point' is the result when no other keywords than CROSS are given. The resulting directions are also indicated.
The next picture shows the points (and directions) at the edge of the flange that are reached with the aid of the keyword SIDE.
Note: The directions have changed compared to the previous picture.
Similar principles are also valid for the profile types normally used for pillars. However, DIR should be given in all cases except when a point is wanted in the description line.
Welded flanges can be considered as T-bars. However, if none of TOP, FLA and SID is given the point will be delivered on the free face of the flange. Also, if TOP or FLA are not given when SID is used the point will be delivered on the mold line side of the flange.
The resulting directions will be as follows.
If SID is not given then the primary direction (DIR1) will be in the direction of the web and the secondary direction (DIR2) along flange towards web. See the image below which also illustrates the positions that can be reached without the keyword SIDE.
If SID is given, DIR1 will be along the flange in the direction indicated by SID. DIR2 will be along the web of the profile inwards the flange. This is illustrated in the next picture.
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Examples: |
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1. |
POI, CRO, L240; |
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2. |
POI, 'WEB', F1, SID=AFT, FLA, M1=-20; |
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3. |
POI, CRO, 'DECK', SL13, TOP, M1= -50; |
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4. |
POI, CRO, U=1000, MSI=AFT, ST5; |
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5. |
POI, CRO, R3, X=FR75, L200, M1=-50, PER; |
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6. |
POI, CRO, Z=7000, PI3, DIR=PS; |