5. C modeling#
5.1. Characteristics of modeling#
The eigenmodes of the complete system are calculated using the modal calculation method by substructuring with “Craig-Bampton” interfaces (blocked interfaces). The bases of each substructure are composed of a dynamic mode and a constrained mode.
The dynamic mode of each substructure is associated with a damping reduced by \(\text{1\%}\).
The transient response of the damped system is calculated on the modal basis calculated by substructuring.
The time steps taken are equal to: \({10}^{-2}s\) in EULER, \({10}^{-2}s\) in NEWMARK, in, \({10}^{-2}s\) in ADAPT_ORDRE2 (for the latter, this is the initial time step of the algorithm and the maximum time step is set to the formula \(\mathrm{0,1}s\) to optimize the calculation time).
5.2. Characteristics of the substructure mesh#
Number of knots: 3
Number of meshes and types: 2 SEG2
5.3. Tested sizes and results#
Identification |
Reference |
Method: EULER |
|
Node \({x}_{2}\), move (\(m\)) |
4.9867 10—1 |
Method: NEWMARK |
|
Node \({x}_{2}\), move (\(m\)) |
4.9867 10—1 |
Method: ADAPT_ORDRE2 |
|
Node \({x}_{2}\), move (\(m\)) |
4.9867 10—1 |
Note: the C modeling tests are duplicated because we want to test the modal calculation on the projected matrices with automatic passage to the MUMPS solver while the user requested the MULT_FRONT solver, which is not available in this case. The results are the same.