Obtaining Summaries of the Model Obtaining Summaries of the Model

To obtain summaries of the database, one must enter a sub-menu devoted to this purpose. To enter this menu, one need only issue the command


     &SUMMARY

At this point, numerous commands are available. When finished with summaries, the user must exit the report sub-menu by issuing the END_&SUMMARY command, which returns the user in the menu where he entered &SUMMARY. To restrict the quantity of information received, one can employ the options for the previously discussed &REP_SELECT command thereby limiting the reports to subsets based on the selectors. In general, all reports are separated by body and part, an exception being summaries based on connectors and classes which have no body or part. Thus, most reports can be obtained for only selected bodies and parts. For all of the commands in this menu, one can request different types of data to be reported. If no type selection is made, reports for all of the available types will be printed.

Summaries of the properties of compartments are obtained with the command:


     COMPART_SUM, TYPE(1), TYPE(2), ..., -OPTIONS

Here, TYPE must be chosen from PROPERTIES, PIECES, E_PIECES, TUBTANK, PANELS, MESH, STRIP, or LONG_STRENGTH, and the available options are those of the &REP_SELECT command. A TYPE of PROPERTIES produces a report for each compartment giving the name, description, specific gravity, volume, weight, full CG, and the maximum derivative of the CG. A TYPE of PIECES produces a report for each piece giving the compartment, the piece, the permeability, the diffraction type, the projected area, and the integral of the normal over the area (this should be zero). Similarly, a TYPE of E_PIECES gives a report of each piece which forms the exterior of the vessel. The report gives: the diffraction type, the permeability, the wind and drag coefficients, and the water depth / draft current force multipliers. A TYPE of TUBTANK produces a report on the tubtanks defined for each compartment. A TYPE of PANELS produces a list of the panels defining each piece of each selected compartment for the selected bodies and parts. With this type, the -PANEL option of &REP_SELECT is honored, and if it is used, only the panels selected will be reported. A TYPE of MESH will produce a report of the diffraction mesh for all bodies which match the body selector. A TYPE of STRIP will yield a report of the planes to be used for strip theory computations. A TYPE of LONG_STRENGTH produces a summary of the vessel longitudinal strength properties.

To produce reports for selected bodies and parts for load groups selected by the load group selector, one issues the command:


     LOADG_SUM, TYPE(1), TYPE(2), ..., -OPTIONS

where TYPE(i) must be chosen from ATTRIBUTE, UD_FORCE, or MATRICES, and the available options are those of the &REP_SELECT command. A TYPE of MATRICES is used for reporting the mass, added mass, and damping matrices for the group. A TYPE of ATTRIBUTES is used for the buoyancy and area contributions to the group. Finally, a TYPE of UD_FORCE is used for reporting user defined loads for the group.

The next command is used to obtain summaries of the properties of beams. It returns reports for elements selected with the element selector, for classes selected by the class selector, and with end nodes which match the node selectors. The form of the command is:


     BEAM_SUM, TYPE(1), TYPE(2), ..., -OPTIONS

where TYPE(i) must be chosen from LOADS, PROPERTIES, UD_FORCE, CLEARANCE, SCF, TUBE, ENDS, or VORTEX and the available options are those of the &REP_SELECT command, and, for a type of VORTEX,


     -W_VELOCITY, WIND_VELOCITY

     -C_VELOCITY, CURRENT_VELOCITY

     -BRIEF

A TYPE of PROPERTIES reports the location, offsets, length, etc. of beams. A TYPE of LOADS reports the intrinsic load attributes (weight and diameters) for elements, and UD_FORCE reports the user defined load sets applied to beams. A type of SECTION is used for reporting beam section properties. A type of CLEARANCE produces a report giving the distance from the extremities of a member to the extremities of all of the other members not connected to the given one. A type of SCF gives the stress concentration factors for the selected beams along the beam. In addition to the SCF, the type of connection, the thickness the SN curve also reported. A type of TUBE produces a report of the diameter, thickness, yield stress, and length of each segment of the selected tubular members. A type of ENDS reports the part coordinates of the ends of the selected beams.

Finally, a type of VORTEX is used to obtain information about vortex shedding on the selected beams. It will produce two reports: one for beams out of the water where wind provides the excitation, and one for beams in the water where current provides the excitation. Either of these reports can be limited to only those beams which should be "checked" by using the -BRIEF option. Here, the first three natural frequencies of vibration of the beam both inplane and out of plane are computed. These frequencies are used to compute the critical velocities (velocities at which vortices will be shed at the same frequency as the natural frequency of the beam). In addition, the wind speeds that mark the beginning and end of Region II of vortex shedding are reported. Conceptually, no vortex shedding occurs within Region II. Finally, a comment is added to "check" beams which may be subjected to vortex shedding. This comment occurs whenever the smallest critical speed is below the beginning of Region II, and whenever a critical speed is greater than the end of Region II and less than the specified velocity. The velocities which are used in the "checking" criteria are WIND_VELOCITY (knots) and CURRENT_VELOCITY (ft/sec or m/sec) specified with the two options -W_VELOCITY and -C_VELOCITY.

In computing natural frequencies, several assumptions have been made which may prove to be inapplicable to the situation. In particular, it is assumed that the mode of vibration is given by

     mode = sin n * pi * x / ( k * L )

where x is measured from the left end of the beam. The diameter used in computing both the Reynolds number and the critical wind speed is a length average of the wind diameter for all element attributes.

To obtain a summary for generalized plates one should issue:


     PLATE_SUM, TYPE(1), TYPE(2), ..., -OPTIONS

where TYPE(i) must be chosen from PROPERTIES, FACE, SUBELEMENT, or VERTEX and the available options are those of the &REP_SELECT command. The first of these produces a report similar to PROPERTIES for beams, The second one reports the faces for the generalized plate, the third on reports the subelement names area and centroids for each generalized plate, and the last one reports the nodes, releases, and offsets for each vertex.

To obtain a summary for RESTRAINTS, one should issue:


     RESTRAINT_SUM, -OPTIONS

and the available options are those of the &REP_SELECT command. This command will produce a report of the location of the ends of each element which is not neither a beam nor a plate and is not a connector.

The next command produces a report of the weight, center of gravity, buoyancy, and center of buoyancy of each class and each load group by category. Only those selected elements and load groups belonging to selected parts will be considered. The form of the command is:


     CATEG_SUM, -OPTIONS

and the available options are those of the &REP_SELECT command. In particular, if the option -BRIEF is used then only the total for each category will be reported.

To obtain information about the property classes selected by the class selector, one issues the command:


     CLASS_SUM, TYPE(1), TYPE(2), ..., -OPTIONS

where TYPE(i) must be chosen from DIMENSION SECTION, MATERIAL, or SOIL and the available options are those of the &REP_SELECT command. A TYPE of DIMENSION reports the information about the section type and size. SECTION reports section and stiffener properties. MATERIAL provides information about the redesign and material properties of the class, such as yield strength and Young's Modulus. Finally, SOIL will produce a report of the soil properties for the selected classes that have soils defined.

Information about points selected by the node selector is generated with the command:


     POINT_SUM, TYPE(1), TYPE(2), ..., -OPTIONS

where TYPE(i) must be chosen from NOSES, POINTS, N_COINCIDENT, SCF or PROPERTIES and the available options are those of the &REP_SELECT command. A TYPE of NODES will produce information about POINTS which are have structural elements connected to them; i.e. NODES which are selected by the node selector. This TYPE reports the node name, the node type, the X, Y, Z coordinates in the part system, the X, Y, Z coordinates in the global system, and the degrees of freedom of the node which are fixed. Here the type is either: TUBE-JOINT, TUBE/TUBE, TUBE/CONE, JOINT, NODE or EXTREMITY. The second two types are used for nodes that have only two beams in a line connected. JOINT is used for nodes that have more than one element connected but are not TUBE-JOINTS, A TYPE of NODE is used for two connected elements that are not TUBE/TUBE or TUBE/CONE types, and EXTREMITY is used for a node with only one element connected. A TYPE of POINTS will list all points which are not nodes, their coordinates, and the node associated with the point. A type N_COINCIDENT will produce a report of the nodes in each part which are coincident. Information about tubular joints are obtained with the last two TYPEs. A TYPE of SCF will produce a report on the stress concentration factors and the API strength unity ratio. A type of PROPERTIES will produce a report of the diameter, thickness, yield stress, and angles for each brace for the selected joints, and the API strength unity ratio.

A final command is used to produce a summary of the wave elevation, wave velocity, and wave acceleration for all grids selected, and its form is:


     GRID_SUM,  -OPTIONS

Here, the available options are those of the &REP_SELECT command. The selection criteria here is the one defined via -DATA.