In linearization analysis, the nonlinear representations of force, motion, stiffness, or damping are linearized. A linearization can be performed on these models to prepare a model for use with Matlab or to obtain eigenmodes characteristics of the model. In the case of performing a linear analysis on the mechanical system, optional files of type eig_info, Simulink MDL, and Matlab ABCD matrices are available to be exported.

A multi-body subcase needs to be defined in the input deck. Only one such subcase can be used in a model. A linear simulation is defined by referring an MBSIM subcase entry to a MBLIN bulk data statement. The MBLIN bulk data entity also selects linear analysis types, EIGEN or STMAT. A sequence of several simulations of different types can be defined by referring to an MBSEQ bulk data statement instead. Loads and motions are referenced on MLOAD and MOTION subcase entries, respectively. SPC type constraints in Multi-body Dynamics analysis are allowed only for MBD-ESL optimization of a flexible body if displacements are used as constraints. Initial velocities do not apply here. Further information on loads and boundary conditions can be obtained from the sections Applied Forces and Motions and Initial Velocity.

The unit system for the simulation can be defined using a DTI, UNITS bulk data entry.

See Also:

Multi-body Dynamics Simulation