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$MODES

This section corresponds to Modes, an ancillary module of Flexcom, which performs modal analysis. Refer to Modal Analysis for further details.

This section contains the following keywords:

•*EIGENPAIRS is used to specify the required number of natural frequencies, and also parameters relating to the subspace iteration algorithm.

•*ELEMENT SETS is used to group individual elements into element sets.

•*EXCLUDE MODES is used to specify modes to be excluded from SHEAR7 output.

•*FRICTION is used to specify longitudinal and transverse seabed friction stiffnesses.

•*INCLUDE MODES is used to specify modes to be included in SHEAR7 output.

•*NAME is used to specify a title for a Modes analysis run.

•*OUTPUT OPTIONS is used to specify the eigensolution details to be routed to the output file.

•*PROPERTIES is used to assign effective structural properties to element sets for use in calculating stresses.

•*REPEAT is used to specify that the present Modes analysis is a Repeat Run.

•*REPLACE MODES is used to specify modes to be replaced in SHEAR7 output.

•*RESTART is used to indicate that a Modes analysis is to be restarted from a previous Flexcom run.

•*RISER TYPE is used to specify the riser type and other parameters relating to the Modes facility for generating output for subsequent input to SHEAR7.