End Points First
- Last UpdatedDec 08, 2025
- 4 minute read
This sub-syntax is valid in situations where the end points of the stiffeners are primarily defined. The mold line then "results" as the line between the end points and the problem is reduced to selecting the end points in the correct order.
However, there are the additional possibilities that:
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One end point also defines the direction of the mold line.
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One end point is calculated or given and the direction of the mold line is given explicitly.
In these two cases, the other end point can be calculated as described in Mold Line First.
The pictures below give an overview of the possibilities:
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Both end points explicitly given or calculated:
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One end point defines the direction of the stiffener as well.
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One end point is calculated or given and the direction of the mold line is given.
Syntax:
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<end_points_first>::= [,T= <dir_angle> (1 ... 25)] <end_point_1> / <end_point_2 |
The direction angle can be controlled if only one of the end points is uniquely defined by a connection or a given point. for example, a case where a stiffener connects a longitudinal to a stiffener on the panel itself. Then, normally, the stiffener is set in the direction of the web of the longitudinal. Any other direction may be defined by T in this and similar situations. When given, T is the direction of the mold line, that means, from end point 1 to end point 2.
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<dir_angle>::= <number> |
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<end_point_1>::= |
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CON |
See Mold Line First above. |
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<end cut> |
See Mold Line First above. Also see Recalculation of End Cut Parameters below. |
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<point_1> <ext_prof_ref> |
See General Layout of a Statement in a previous chapter. <line_1> can only be used if the direction has been defined by the opposite end point (or by T). Note: The stiffeners cannot be attached to flanges. |
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<name> |
Name of an intersecting panel to the surface of which the stiffener is attached. It may be mirrored in the CL-plane by adding the keyword REF. |
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<end_point_2> is identical to <end_point_1> if <point_1> is replaced by <point_2>. |
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If no point and no profile reference are given, the stiffener is supposed to end at the outer contour in the same way as described in "Mold Line First" above. |
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To summarize, the following possibilities exist if at least one of the end points has a fixed position. Then the other end point can be set by:
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explicitly given coordinates.
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attachment to a profile intersecting the plane of the panel. The profile can be in the shell or an adjoining panel.
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by attachment to a stiffener, bracket or hole on the panel itself or to the contour of the panel. (In the latter case, only the connection code is given.)
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by "attachment" to an intersecting line.
In case of connection, an appropriate connection code must be given.
Example 1 (both end points explicitly given):
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STI, SID=AFT, PRO=10, 200, 12, WELD=6, |
Example 2 (both end points attached to intersecting profiles):
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STI, SID=AFT, L300-320, CUT=1100, CON=4/ |
Example 3 (one point explicitly given, the other attached to an intersecting profile):
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STI, L370, CUT=1120, CON=4/ Y2=21000, |
Example 4 (attachment to the longitudinal defines the starting points as well as the direction of the mold line):
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STI, ..., S3, CON=14, CUT=1302, 15/ |
Example 5 (the explicitly given direction will override the direction fetched from the longitudinal):
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STIFFENER, ... |
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(Direction angle from the positive u-axis.) |
Example 6 (like example 4 except that the stiffener on the panel has been replaced by a panel.)
STI, L370, CON=13, CUT=1130/'INT_PANEL', CON=65 ....;
Example 7 (like example 4 except that the stiffener has been replaced by a line)
STI, ...L370, ... / Y2=18000, .... ;
Example 8 (ditto, but stiffener replaced by bracket)
STI, ..., L370, .../ BR3, CON ... ;
Example 9 (ditto, but stiffener replaced by hole)
STI, ..., L370, .../ HOL2, CON= ... ;