Post-Processing Applied Forces

If data for any element or load groups exists in the database, two additional commands are available for post-processing. These commands will result in the computation of the forces which act on either the vertices of an element or the nodes of a load group during the process. The ELMFORCE command is used for elements with two vertices, and the LDGFORCE command is used for generalized plate elements or load groups. For an ELMFORCE command, forces will be computed at the two end nodes of all elements which are selected by the selector :ELE_NAME. The form of the command is:

     ELMFORCE, :ELE_NAME  -OPTIONS

The available options are:

     -EVENTS, E_BEG, E_END, E_INC

     -FORCE, FORCE_NAME(1), ....., FORCE_NAME(n)

Here, E_BEG and E_END are the beginning and ending event numbers for which the results will be computed, and E_INC is an event increment. Also, FORCE_NAME(i) is a selector which selects forces from the list: WEIGHT , CONTENTS, BUOYANCY, WIND , DRAG , WAVE , SLAM , CORIOLIS, SKIN_FRI, DEFORMATION, EXTRA , APPLIED , INERTIA , A_INERTIA, C_INERTIA, FLEX_CONNECTORS, RIGID_CONNECTORS, and TOTAL . If this option is omitted, only the total force will be computed. The corresponding form of the REPORT command is:

     REPORT, -OPTIONS

The only option available for reporting is:

     -EVENTS, E_BEG, E_END, E_INC

The LDGFORCE command operates somewhat differently. Here, one can select only a single group, LG_NAME. The other data on this command is a set of node names, NODE_NAME(i). If this data is specified, then the forces will be computed at the specified nodes.

The computation of force at the specified nodes is accomplished by first computing a force applied to the element. A least square fit is then performed to reduce this total force and moment to forces at the specified nodes. The form of the command is:

     LDGFORCE, LG_NAME, NODE_NAME(1),  .... NODE_NAME(n), -OPTIONS

The available options are:

     -EVENTS, E_BEG, E_END, E_INC

     -FORCE, FORCE_NAME(1), ....., FORCE_NAME(n)

Here, E_BEG and E_END are the beginning and ending event numbers for which the results will be computed, and E_INC is an event increment. Also, FORCE_NAME(i) is a selector which selects forces from the list: WEIGHT , CONTENTS, BUOYANCY, WIND , DRAG , WAVE , SLAM , CORIOLIS, SKIN_FRI, DEFORMATION, EXTRA , APPLIED , INERTIA , A_INERTIA, C_INERTIA, FLEX_CONNECTORS, RIGID_CONNECTORS, and TOTAL . If this option is omitted, only the total will be reported The corresponding form of the REPORT command is:

     REPORT, -OPTIONS

The only option available for reporting is:

     -EVENTS, E_BEG, E_END, E_INC