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Solver Settings - Flexible Bodies

Settings → Solver → Flex Bodies

Sets the options for flexible body linear limit feature.

For the option:	Do the following:
Category	Set to Flexible Bodies.
Model	Enter the name of the model associated with the settings.
Limit Check	Select the limit check option to be used ■Skin - Adams Solver C++ will check the deformation of all the nodes on the skin to see whether they exceed the linear limit. To use this option, MNF_FILE or DB_FILE need to be specified in FLEX_BODY statement. ■Selnod - Adams Solver C++ will only check the nodes specified in SELNOD section in MTX file. ■None The linear limit is defined as 10% of the characteristic length of the flexible body. You can use CHAR_LEN in FLEX_BODY statement to specify the characteristic length. If CHAR_LEN is not specified, Adams Solver C++ will calculate the characteristic length using MNF or MD DB if MNF_FILE or DB_FILE is specified. Otherwise, Adams Solver C++ issues a warning.
Limit Action	Select the action to be performed when flexible body exceeds its linear limit. ■Halt - Terminates execution of Adams Solver C++. ■Return - Stops the simulation and returns to the command level. ■Message Only - Issues a warning message only (Default).
Formulation	Select the flexible body formulation to be used. “Original” is applicable to all models with flexible bodies, “Optimized” and “Max Optimization” may enable models with flexible bodies to solve faster but come with some restrictions on usage. See the help on the PREFERENCES statement for more detail.
Rotor Dynamics	Turn On or Off the computation of local gyroscopic effects (such as stress stiffening/spin softening due to high speed rotor dynamics) for flexible bodies in the model that have rotor dynamic definitions included in the MNF. Off is the default. In order to capture local gyroscopic effects due to high speed rotations the MNF of the flexible body must have been generated using SOL 107, Direct Complex Eigenvalue in MSC.Nastran with the ADAMSMNF command. This will produce an MNF with rotor dynamics matrices such as gyroscope, circulation and differential stiffness matrices. To know how these rotor dynamic matrices are applied in Adams, see Theory of Flexible Bodies Limitations of Using Nastran Rotordyamics in Adams Flex Body Modeling ■A rotordynamics problem in MSC.Nastran can be analyzed either in a fixed or rotating coordinate reference frame. However, MSC.Nastran only supports the generation of an MNF with rotordynamics terms in the fixed reference frame. ■Since only fixed reference frame is supported, the shape of the rotating part (rotor) should be axisymmetric about the spin axis. Non-axisymmetric shapes will result in approximate solutions. ■Do not include stationary part (stator) in MSC.Nastran model with rotor (rotating part). Model them separately. ■Do not include multiple rotors in Nastran model. If more than one rotor will be assembled in the Adams model, it is recommended to analyze them separately in Nastran, resulting in one rotor per MNF. ■Axisymmetric finite elements (CQUADX, CTRIAX, RBAX3D, PAXSYMH) can be commonly used to model a rotor in MSC.Nastran. However, Adams does not know how to display these elements, thus meshes with axisymmetric elements are not supported. Use either 1D (CBEAM, CBAR), 2D plate/shell (CQUAD, CTRIA) or 3D solid (CTETRA, CPENTA, CHEXA) finite element meshes to model the flexible rotor in MSC.Nastran.