The elasticity modulus E=7.1e10 Pa was used, which is less than for steels or most titanium alloys
The structure has many connecting holes
10-node tetrahedral FEs
Comparing the results for the maximum model and the optimized one (¼, without additional elements)
A simplified model adequately describes the object when finding Eigen modes < 2 kHz. It has approximately ten times less finite elements and a substantially faster counting time.
Based on calculations in CAE Fidesys, we obtained conclusions for simplified models. Models taking into account symmetry (1/2, 1/4) can be used to optimize the shape of the cover relative to the initial oscillation mode. But these models are not suitable for optimizing sidewall vibrations, because they do not describe the initial mode of sidewall oscillations.