How to define Inertia Relief Analysis

Hello,

 

Inertia Relief analysis is the analysis of unconstrained structure e.g. a plane in flight. The applied loads are balanced by a set of translational and rotational accelerations (automatically determined by the solver) instead of reaction forces (as with 'classic' boundary conditions).

 

To define inertia relief, please define SUPORT instead of SPC in the constraints menu. The degrees of freedom are the same as with SPCs. You can also define param inrel -2 in the control card section to automatically determine accelerations on the model for force balance.

 

A description of inertia relief can be found in the help:

<PATH>/hw13/help/hwsolvers/hwsolvers.htm?loads_and_boundary_conditions.htm

or in the Basic OptiStruct tutorials

OS-1030: 3D Inertia Relief Analysis using OptiStruct

 

Best Regards

 Jan