Chapter 3: Using Component Mode Synthesis

As in substructuring, a component mode synthesis (CMS) analysis involves three distinct steps, called passes:

  1. Generation pass (SEOPT, CMSOPT, M)

  2. Use pass (MATRIX50, SETRAN, SESYMM, CPINTF)

  3. Expansion pass (EXPASS, SEEXP, EXPSOL, NUMEXP)

The CMS generation pass condenses a group of finite elements into a single CMS superelement, which includes a set of master degrees of freedom and truncated sets of normal mode generalized coordinates. The master degrees of freedom serve to define the interface between the superelements or other elements.

The following CMS usage topics are available:

CMS Wizard

A user-friendly wizard is available to help you better understand the CMS process as well as to guide you through the generation, use, and expansion passes for the fixed-interface (CMSOPT,FIX) and free-interface (CMSOPT,FREE) methods for modal analyses. The wizard also provides file organization and management support as files are generated by a CMS analysis. Use the Solution (/SOLU) processor to access the CMS Wizard.