Post-Processing Connector Forces Post-Processing Connector Forces

MOSES has several commands available for post-processing connector forces. All of these commands make the results available in the Disposition Menu and have a common option:


     -EVENTS, E_BEG, E_END, E_INC

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.

The corresponding form of the REPORT command is:

     REPORT, REP_NAMES(1), REP_NAME(2),  ... -OPTIONS

Here, REP_NAMES(i) is a set of report names which may be selected and will depend on the command issued. The only option available for reporting is -EVENTS

Many of these commands accept an addition option:


     -MAG_DEFINE, A(1), .. A(n)

This option defines how the magnitude of the force is computed. You can have one, two or three A(i) and each on must be either X, Y, or Z. If you specify all three (the default) then the magnitudes will be the length of the vectors. Alternatively, the magnitude will be the length of the vector projected on two either a line (if one is specified) or a plane. For example

     -MAG_DEFINE X Y

will give you the length of the vector projected onto the X-Y plane. Often, the details of the forces are not required, only their magnitude. When this is the case, a more concise report can be obtained via the second command.

The first of the connector commands is the C_LENGTH command.


     C_LENGTH, :CONN_SEL,  -OPTIONS

This command reports the length of the connectors selected by :CONN_SEL and the available option is:


     -EVENTS, E_BEG, E_END, E_INC

A the next three commands produce results on force in connectors selected by :CONN_SEL. The command


     CONFORCE, :CONN_SEL,  -OPTIONS

produces the force, the magnitude of the force, the magnitude of the force divided by the breaking strength, the length of line on bottom, the vertical pull on the anchor, and the horizontal pull on the anchor for the selected connectors. The available options are:


     -EVENTS, E_BEG, E_END, E_INC

     -MAG_DEFINE, A(1), .. A(n)

The command


     CF_MAGNITUDE, :CONN_SEL,  -OPTIONS

reports only the force magnitude and the magnitude divided by the breaking strength and the available options are:


     -EVENTS, E_BEG, E_END, E_INC

     -MAG_DEFINE, A(1), .. A(n)

The command


     CF_TOTAL, BODY, :CONN_SEL,  -OPTIONS

reports the total force on the body BODY due to the connectors selected by :CONN_SEL. In addition, the power of these forces on the body is reported. Here, the body for which the results are reported is the body connected to "end one" of the first connector selected. The force is reported in the body system. The available options are:


     -EVENTS, E_BEG, E_END, E_INC

     -MAG_DEFINE, A(1), .. A(n)

The command


     FOUNDATION, :CONN_SEL -OPTIONS

"checks" a foundation. It computes four unity ratios, one each for overturning, sliding, and capacity, or pre-load,

     Uo = f ( Vc - Vn ) / Vn
     Up = f Vc / Vp
     Uc = f Vc / Vn
     Us = f mu Hc / Vc

Here V stands for vertical load, H for horizontal load, the subscript c stands for the current state, the subscript n stands for the "nominal" state, and the subscript p for the "pre-load" state. The factor f and the values for the pre-load and nominal states are defined with the &CONNECTOR command. The coefficient of friction, mu, is defined with the class. The available option is


     -EVENTS, E_BEG, E_END, E_INC

Launchway connectors are not available for reporting with the above commands. Instead, if one is interested in the forces which a set of launchways exert on the jacket, then he should issue the command


     LWFORCE, -OPTIONS

Here the only option is


     -EVENTS, E_BEG, E_END, E_INC

The command


     TIP-HOOK, -OPTIONS

provides the length of the boom line and the forces in the boom and sling elements as a function of time. Again, the only option is


     -EVENTS, E_BEG, E_END, E_INC