Pressure table definition
 @PRESSURE_TABLE_DEFINITION {
 @PRESSURE_TABLE_NAME {PresTableName} {
 @Y_ENTRY {v_{1}, ..., v_{nv}}
 @TABLE_ENTRIES {
 @X_ENTRY {u_{i}}
 @PRESSURE {p_{i, 1}, ..., p_{i, nv}}
 }
 @COMMENTS {CommentText}
 }
 }
NOTES
Figure 1. Grid for the definition of a pressure table.

This section defines a pressure distribution over a surface. This loading table is used in conjunction with face loads to apply distributed loads on shell or membrane elements. Loading will be defined at the nodes of a rectangular grid over the surface that defines the geometry of the shell or membrane. The u and v coordinates of this NURBS surface will be used to defined the grid points, as depicted in fig. 1. At first, the number of grid points nu and nv along the u and v coordinates, respectively, are defined. Next, the nv grid points, v_{1}, ..., v_{nv}, along the v axis are defined. Note that v_{1} = 0.0, v_{nv} = 1.0, and the intermediate values must appear in ascending order.

The actual loading table consists of the definition of the loading along nu columns parallel to the v axis. Each column starts with the u_{i} entry at which is is located, followed by the nv loads at the nv grid points of this column. Note that u_{1} = 0.0, u_{nu} = 1.0, and the intermediate values must appear in ascending order. At any point on the surface, the loading is linearly interpolated among the four closest grid points.

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