CMSMETH – Component Mode Synthesis Method definition for flexible-body preparation solution sequence.
Defines the method, frequency upper limit, and number of modes to be used in component mode synthesis for flexibly-body preparation solution sequence.
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CMSMETH |
CMSID |
METHOD |
UB_FREQ |
NMODES |
SPID |
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CMSMETH |
3 |
CB |
1000.0 |
200 |
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Field |
Contents |
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CMSID |
CMSMETH identification number. (Integer > 0) |
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METHOD |
Component mode synthesis method to be employed. See comment 1. Default = CB (CB or CC) |
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UB_FREQ |
Upper bound frequency for the eigenvalue analysis. If 0.0 or blank, no upper bound is used. See comments 2 and 3. Default = blank (Real > 0.0, or blank) |
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NMODES |
Number of modes to be extracted from eigenvalue analysis. If set to -1 or blank, number of modes is limitless. See comments 2 and 3. Default = blank (Integer > -1, or blank) |
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SPID |
The starting SPOINT ID to be used in DMIG matrix output for the eigenmodes. See comment 4. Default = 9000001 or the largest user input GRID (or SPOINT) ID, plus 1; whichever is greater. |
Two methods are available for Component Mode Synthesis:
a) CB – Craig-Bampton
b) CC – Craig-Chang
UB_FREQ and NMODES cannot both be blank.
When UB_FREQ = 0.0 and NMODES = 0, this is a special case where no eigenmodes will be included in CMS mode generation.
If PARAM, EXTOUT, DMIGPCH (or DMGBIN) is defined when using the CB method, then a DMIG matrix corresponding to the reduced stiffness and mass matrices will be output. The stiffness and mass corresponding to the eigenmodes will be assigned to the generated SPOINTs.
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