Overlap of Profile End

<overlap_profile_end>::= OVERLAP

,<profile>

,<intersect_plane>

,<contour_param>

<profile>

defines the profile to overlap

<profile>::=

<shell_prof_ref>/

<stiff_tag_ref>

see General Layout of a Statement

<adj_pan>

is the name of an adjacent panel on which the stiffener referred to is located.

The name must be given immediately after the keyword OVERLAP.

<adj_pan>::= <name>

<side_info>

is used to indicate in which direction from the intersecting plane to search for the profile end. See also above.

It is compulsory for shell profiles, optional if a stiffener tag reference is not unique.

<intersect_plane>

defines the plane from where the overlapping contour is evaluated.

It can be defined in different ways:

• by a given panel

• by a given plane

• by a plane parallel to a principal plane at a given position

• as a tangent plane to a given curve in a given position

  <intersect_plane>::=

     <panel> |

     <plane> |

     (<curve>, X|Y|Z = <coord>)|

     (X|Y|X = <coord>)

All three alternatives are illustrated following image:

<contour_param>

defines the parameters controlling the shape of the contour

<contour_param>::=

   [,R[=<radius>]]

   [,M1=<measure>]

   [,M2|M3=<measure>]

   [,M4=<measure>]

<radius>::= <measure::= <number>

R

When given, the resulting contour will include a lug. The radius at the end of the lug can be controlled (default value: 50).

Example with no radius:

Example with radius (R>0):

A positive value means that the edge of the lug is part of the contour along the trace of the profile (as in the image above).

A negative radius means that the contour will pass perpendicularly across the trace of the profile.

Example with R < 0:

M1

defines the distance of the knuckle point close to the edge of the profile.

Default value: 50

M1 > 0:

The contour is extended parallel to the intersecting plane.

M1 < 0:

The contour is perpendicular to the profile edge.

For example:

M2, M3

These parameters define the overlap in different ways and are mutually exclusive.

M2 defines the distance from the intersecting plane to the intersection point between the resulting contour and the edge.

For example:

M3 controls the actual overlap as in the image above.The overlap is calculated along the edge of the profile. M3 < 5 is interpreted as a factor, giving the actual overlap M3*H, where H is the profile height.

A positive value means that the edge of the lug is part of the contour along the trace of the profile (see below).

Example with overlap with lug (R>0):

A negative radius means that the contour will pass perpendicularly across the trace of the profile (see below below).

Example with R < 0:

M1

defines the distance of the knuckle point close to the edge of the profile.

Default value: 50

M1 > 0:

The contour is extended parallel to the intersecting plane.

M1 < 0:

The contour is perpendicular to the profile edge.

Example interpretations of parameter M1:

M2, M3

These parameters define the overlap in different ways and are mutually exclusive.

M2 defines the distance from the intersecting plane to the intersection point between the resulting contour and the edge.

Example interpretation of parameter M2:

M3 controls the actual overlap as in the image above.The overlap is calculated along the edge of the profile. M3 < 5 is interpreted as a factor, giving the actual overlap M3*H, where H is the profile height.

Example interpretation of parameter M3:

If neither M2 nor M3 are given, M3 = 1.5 as default.

In calculating the overlap, the end cut of the profile will be taken into consideration.

M4

M4 has different meanings for a contour with and without a lug:

With a lug:

M4 > 0:

M4 is interpreted as the distance from the intersecting plane to the knuckle of the contour at the lug.

M4 < 0:

M4 is interpreted as the distance along the profile trace from the profile end to the starting point of the arc at the lug. See the example image below.

Example interpretation of M4 (contour with lug):

Default: M4 = -50

Contour without a lug:

M4 is the distance in the intersection plane between the profile trace and the resulting contour.

M4 is the distance in the intersection plane between the profile trace and the resulting contour.

Example interpretation of M4 (contour without lug):

The default is dependent on the angle ( x ) between the profile trace and the intersecting plane:

x < 110 degrees: M4 = 100

x >= 110 degrees : M4 = 75

Remarks:

1. The length of the contour from the intersection plane to the edge of the profile will be available as the parameter value H in the LEN-clause in the BOUNDARY syntax for a free side, see Free Side Syntax.

2. If the position of the panel is defined by a profile overlap, the origin will lie in the intersection point between the intersecting plane and the profile trace, the u-axis along the intersecting plane and the v-axis in the direction towards the overlapped profile. The uv-plane coincides with the plane of the profile end.

   When evaluating the circulation direction, this should be kept in mind.

In such cases, it is recommended to avoid local (uv) coordinates in input.